SANDPIPER ST25 User Manual

II 2GD T5

SERVICE & OPERATING MANUAL

Original Instructions

Model ST1 Type 5

See pages 17 & 18
for ATEX ratings

Model ST25 Type 5

Table of Contents

Engineering Data, Temperature Limitations & Performance Curve ....................... 1

Explanation of Pump Nomenclatur ........................................................................ 2

Dimensions ............................................................................................................ 3

Principle of Operation ............................................................................................ 4

Installation and Start-Up ........................................................................................ 4

Air Supply .............................................................................................................. 4

Air Inlet & Priming .................................................................................................. 5

Air Exhaust ............................................................................................................ 5

Between Uses ....................................................................................................... 5

Check Valve Servicing ........................................................................................... 5

Diaphragm Servicing ............................................................................................. 5

Air Valve Lubrication .............................................................................................. 6

ESADS+Plus®:

Externally Serviceable Air Distribution System .............................6-7

Pilot Valve .............................................................................................................. 8

Pilot Valve Actuator ................................................................................................ 8

Service Instructions: Troubleshooting ................................................................... 8

Warranty ................................................................................................................ 9

Recommended Accessories .................................................................................. 9

Important Safety Information ............................................................................... 10

Recycling ............................................................................................................. 10

Grounding The Pump .......................................................................................... 11

Material Codes .................................................................................................... 12

Composite Repair Parts List ........................................................................... 13-14

Composite Repair Drawing.................................................................................. 15

CE Declaration of Conformity - Machinery .......................................................... 16

CE Declaration fo Conformity - ATEX .................................................................. 17

Explanation of ATEX Certication ........................................................................ 18

st1dl5sm-rev0614

Warren Rupp, Inc. • A Unit of IDEX Corporation • 800 N. Main St., Manseld, Ohio 44902 USA

Telephone [phone] • Fax [phone] • warrenrupp.com

©Copyright 2014 Warren Rupp, Inc. All rights reserved.

Quality System

See page 2
for ATEX ratings.

ISO9001 Certied

Environmental

Management System

ISO14001 Certied

Containment Duty

ST1

Type 5

ST25 Type 5

Air-Operated
Double Diaphragm Pump

INTAKE/DISCHARGE PIPE SIZE

ST1: 1” NPT (internal)

ST25: 1” BSP Tapered (internal)

CAPACITY

0 to 42 gallons per minute
(0 to 159 liters per minute)

See pages 17 & 18
for ATEX ratings.

AIR VALVE

No-lube, no-stall

design

SOLIDS-HANDLING

Occational solids only,
to nearly .25” (6.3mm)

ENGINEERING, PERFORMANCE
& CONSTRUCTION DATA

HEADS UP TO

125 psi or 289 ft. of water

2

(8.8 Kg/cm

or 88 meters)

DISPLACEMENT/STROKE

.09 Gallon / .34 liter

SANDPIPER® Containment Duty Pumps: Sealless Safety

This pump is part of the Containment Duty Pumps. It is specially tted with PTFE diaphragms as well as elastomeric or elastomeric/PTFE driver diaphragms. The liquid-lled
spill chambers provide an additional chemically-resistant barrier, should a pumping diaphragm fail. The Spill Containment design gives the pump user advanced warning of
diaphragm failure, before pumpage can damage the air valve or be released into the work environment. Three optional leak detectors available for this model:

• Mechanical VIP Leak Detector* 031-025-000 • Electronic Leak Detector* (115V) 032-043-000 • Electronic Leak Detector* (220V) 032-043-000

The Containment Duty pumps offer many different levels of materials and spill monitoring devices designed to t a variety of applications and budgets.
* Leak Detectors are not ATEX Compliant

BAR

7

100

90

6

80

5

70

60

4

50

HEAD

3

40

30

2

PSI

100 PSI

80 PSI

60 PSI

40 PSI

AIR CONSUMPTION

SCFM (M

10(17)

3

/hr)

15(25.4)

20(34)

MODEL ST1/ST25 Performance Curve

Performance based on the following: elastomer fitted pump, flooded suction,

water at ambient conditions. The use of other materials and varying hydraulic

25(42.5)

30(51)

conditions may result in deviations in excess of 5%.

35(59.5)

40(68)

45(76.5)

50(85)

st1dl5sm-rev0614

20

1

20 PSI Air Inlet Pressure

10

0

0

0

4 8

12 16

20

24

28 32

36

40

US Gallons per minute

0 20 40 60 80 100 120 140 150

Liters per minute

CAPACITY

SANDPIPER® pumps are designed to be powered only by compressed air.

Models ST1 & ST25 Page 1

0 to 42 gallons per minute

(0 to 159 liters per minute)

Occasional solids only,

to nearly

1

/4"

(6.3 mm)

125 psi or 289 ft. of water

(8.8 Kg/cm2 or 88 meters)

MATERIALS OF CONSTRUCTION

INTAKE/DISCHARGE PIPE SIZE CAPACITY AIR VALVE SOLIDS-HANDLING HEADS UP TO

No-lube, no-stall

design.

PERFORMANCE CURVES

(SANDPIPER® pumps are designed to be powered only by compressed air)

Temperature Limit: 212

°F -

100°C

MAXIMUM

SANDPIPER® Containment Duty Pumps: Sealless Safety

This pump is part of the Containment Duty Pumps. It is specially fitted with PTFE diaphragms as well as elastomeric or elastomeric/PTFE driver diaphragms. The liquid-filled spill chambers
provide an additional chemically-resistant barrier, should a pumpIng diaphragm fail. The Spill Containment design gives the pump user advanced warning of diaphragm failure, before
pumpage can damage the air valve or be released into the work environment. Three optional leak detectors available for this model:

• Mechanical VIP Leak Detector 031-026-000 • Electronic Leak Detector (115V) 032-043-000 • Electronic Leak Detector (220V) 032-043-000

The Containment Duty pumps offer many different levels of materials and spill monitoring devices designed to fit a variety of applications and budgets.

ST1 & ST25
Performance based on water
at ambient temperature.
Average displacement per
pump stroke: 0.34 liter.

SANDPIPER

®

Models

SANDPIPER

®

Models
ST1 & ST25
Performance based on water
at ambient temperature.
Average displacement per
pump stroke: .09 gallon.

ST1: 1" NPT

ST25: 1" BSP Tapered

Containment Duty

ST1 Type 4
ST25 Type 4

Air -Operated
Double-Diaphragm Pump

ENGINEERING, PERFORMANCE
& CONSTRUCTION DATA

Quality System

ISO9001 Certified

Environmental

Management System

ISO14001 Certified

®

II 2GD T5

Explanation of Pump Nomenclature

MATERIALS OF CONSTRUCTION

To order a pump or replacement parts, rst enter the Model Number ST1, or ST25, followed by the Type Designation listed below in the far left column.

Porting

Type 5

DNG5A. X AL356T6 AL356T6 AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/N T T PE AL380DC 46

DVG5A. X AL356T6 AL356T6 AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/V T T PE AL380DC 46

DGNG5A. X AL356T6 AL356T6 AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/T/N T T PE AL380DC 46

DNG5SS. X SS SS

DVG5SS. X AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/V T T PE AL380DC 67

DGNG5SS. X AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/T/N T T PE AL380DC 67

DNG5HC. X AL356T6 AL380DC PS AL380DC 416SS 304SS T/N T T PE AL380DC 67

Kit available to convert to top porting

Meanings of
Abbreviations:

Manifold

Manifold Inner

Side

Chamber

SS SS

SS SS

Alloy C Alloy C Alloy C Alloy C

AL = Aluminum
DC = Die Cast
PS = Plated Steel
HC = Alloy C
SS = Stainless Steel
PE = Conductive HDPE

Driver

Outer

Chamber

AL356T6 AL380DC 316SS PS AL380DC 416SS 316SS 304SS T/N T T PE AL380DC 67

Chamber

Outer

Diaphragm

Plate

304SS = 304 Stainless Steel except
Manifold Bolts which are PS
T = PTFE
T/N = PTFE Diaphragm/Neoprene Driver

PTFE Diaphragm/FKM Driver

T/V =
T/T/N =

PTFE Diaphragm/PTFE over Neoprene Driver

Inner

Diaphragm

Plate

Intermediate

Housing

Rod

ware

Seat

Diaphragm

Hard-

Valve

Ball

Valve

Material

II 2 G c T5

II 3/2 G c T5

II 2 D c T100oC

All models, including pumps equipped with
Aluminum wetted and midsection parts.

See page 18 for ATEX Explanation of Type

Examination Certicate.

Seat/

Manifold

Gasket

Valve

Materials

NEOPRENE All purpose. Resistant to vegetable oils. Generally not affected by moderate chemicals, fats,

greases and many oils and solvents. Generally attacked by strong oxidizing acids, ketones, esters, nitro
hydrocarbons and chlorinated aromatic hydrocarbons.

PTFE Chemically inert, virtually impervious. Very few chemicals are known to react chemically with

PTFE: molten alkali metals, turbulent liquid or gaseous uorine and a few uoro-chemicals such as
chlorine triuoride or oxygen diuoride which readily liberate free uorine at elevated temperatures.

FKM (Fluorocarbon) shows good resistance to a wide range of oils and solvents; especially all aliphatic,
aromatic and halogenated hydrocarbons, acids, animal and vegetable oils. Hot water or hot aqueous solu
tions (over 70°F) will attack FKM.

Maximum and Minimum Temperatures are the limits for which
these materials can be operated. Temperatures coupled with
pressure affect the longevity of diaphragm pump components.
Maximum life should not be expected at the extreme limits of
the temperature ranges.

Operating Temperatures

Maximum Minimum

200°F -10°F
93°C -23°C

220°F -35°F
104°C -37°C

-

350°F -40°F
177°C -40°C

Air

Shipping

CapDiaphragm

Wt. (lbs)

CF-8M Stainless Steel equal to or exceeding ASTM specication A743 for corrosion resistant iron

‡

chromium, iron chromium nickel, and nickel based alloy castings for general applications. Commonly
referred to as 316 Stainless Steel in the pump industry.

ALLOY C CW-12MW equal to or exceeding ASTM A494 specication for nickel and nickel alloy castings.

For specic applications, always consult “Chemical Resistance Chart" Technical Bulletin

st1dl5sm-rev0614

Models ST1 & ST25 Page 2

Maximum* Minimum* Optimum**

Operating Temperatures

NEOPRENE All purpose. Resistant to vegetable oils. Generally not affected by moderate
chemicals, fats, greases and many oils and solvents. Generally attacked by strong oxidizing acids,
ketones, esters, nitro hydrocarbons and chlorinated aromatic hydrocarbons.

PTFE Chemically inert, virtually impervious. Very few chemicals are known to chemically react
with PTFE: molten alkali metals, turbulent liquid or gaseous fluorine and a few fluoro-chemicals
such as chlorine trifluoride or oxygen difluoride which readily liberate free fluorine at elevated
temperatures.

170°F -35°F50°F to 130° F

77°C -37°C10°C to 54°C

212°F+ -35° F50°F to 212° F

100°C+ -37°C10°C to 100°C

MATERIALS

212°F+ +35° F75°F to 212°F

100°C+ 0°C24°C to 100°C

*Definite reduction in service life.
**Minimal reduction in service life at ends of range.

FKM Shows good resistance to a wide range of oils and solvents; especially all aliphatic,
aromatic and halogenated hydrocarbons, acids, animal and vegetable oils. Hot water or hot
aqueous solutions (over 70ºF) will attack FKM.

For specific applications, always consult "Chemical Resistance Chart" Technical Bulletin.

STAINLESS STEEL CF-8M equal to or exceeding ASTM specification A743 for corrosion resistant iron chromium, iron chromium
nickel, and nickel based alloy castings for general applications. Commonly referred to as 316 Stainless Steel in the pump industry.

ALLOY C CW-12MW equal to or exceeding ASTM A494 specification for nickel and nickel alloy castings.

Dimensions: ST1 & ST25

Dimensions are ± 1/8"

Figures in parenthesis = millimeters

Tapered

14. 9/32

(363)

4. 3/32

(104)

(313)

12. 5/16

Dimensional outlines available showing
optional top and bottom porting.

(116)

4. 9/16

Tapered

(17)

11/16

Optional installation
4 rubber feet.

Model ST1 features NPT threaded connections.

Model ST25 features British Standard Pipe (BSP)
Tapered threaded connections.

(176)

(349)

13. 3/4

6. 15/16
5/8

(16)

st1dl5sm-rev0614

Models ST1 & ST25 Page 3

II 2GD T5

SERVICE & OPERATING MANUAL

Model ST1 Type 5

See pages 17 & 18
for ATEX ratings

PRINCIPLE OF OPERATION

This ball check valve pump is powered by compressed air and is a 1:1 pressure
ratio design. It alternately pressurizes the inner side of one diaphragm chamber, while
simultaneously exhausting the other inner chamber. This causes the diaphragms, which
are connected by a common rod, to move endwise. Air pressure is applied over the
entire surface of the diaphragm, while liquid is discharged from the opposite side. The
diaphragm operates under a balanced condition during the discharge stroke, which al­lows the unit to be operated at discharge heads over 200 feet (61 meters) of water head.

Since the diaphragms are connected by a common rod, secured by plates to the
center of the diaphragms, one diaphragm performs the discharge stroke, while the other
is pulled to perform the suction stroke in the opposite chamber.

For maximum diaphragm life, keep the pump as close to the liquid being pumped as
possible. Positive suction head in excess of 10 feet of liquid (3.048 meters) may require
a back pressure regulating device. This will maximize diaphragm life.

Alternate pressuring and exhausting of the diaphragm chamber is performed by
means of an externally mounted, pilot operated, four-way spool type air distribution
valve. When the spool shifts to one end of the valve body, inlet air pressure is applied to
one diaphragm chamber and the other diaphragm chamber exhausts. When the spool
shifts to the opposite end of the valve body, the porting of chambers is reversed. The air
distribution valve spool is moved by an internal pilot valve which alternately pressurizes
one side of the air distribution valve spool, while exhausting the other side. The pilot
valve is shifted at each end of the diaphragm stroke by the diaphragm plate coming in
contact with the end of the pilot valve spool. This pushes it into position for shifting of
the air distribution valve.

The chambers are manifolded together with a suction and discharge check valve for

each chamber, maintaining ow in one direction through the pump.

This specially-tted SandPIPER pump differs from standard units in that it utilizes

four diaphragms instead of two. The two rod-connected diaphragms being the driver
diaphragms, and the other two (outermost) diaphragms being the actual
pumping diaphragms. Each driver diaphragm (of Neoprene or other elastomer), and the
pumping diaphragm (of TFE), are separated by a chamber lled with liquid. This
transmits the reciprocating motion of the driver diaphragm to the pumping diaphragm.
The TFE pumping diaphragms create alternating suction and discharge action to each
outer diaphragm chamber. The pumping diaphragms are the only ones in contact with
the liquid being pumped.

Model ST25 Type 5

Original Instructions

INSTALLATION & START-UP

Locate the pump as close to the product being pumped as possible, keeping suction

line length and number of ttings to a minimum. Do not reduce line size.

For installations of rigid piping, short exible sections of hose should be installed

between pump and piping. This reduces vibration and strain to the piping system.
A Warren Rupp Tranquilizer

pulsation in ow.

This pump was tested at the factory prior to shipment and is ready for operation. It is
completely self-priming from a dry start for suction lifts of 10-15 feet (35 meters) or less.

For suction lifts exceeding 15 feet of liquid, ll the chambers with liquid prior to priming.

®

surge suppressor is recommended to further reduce

AIR SUPPLY

Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump air inlet

to an air supply of sufcient capacity and pressure required for desired performance.
When the air line is solid piping, use a short length of exible hose (not less than 3/4"

[19mm] in diameter) between pump and piping to eliminate strain to pipes. Use of a
Warren Rupp Filter/Regulator in the air line is recommended.

st1dl5sm-rev0614

Models ST1 & ST25 Page 4

AIR INLET & PRIMING

For start-up, open an air valve approximately 1/2" to 3/4" turn. After the unit primes,
an air valve can be opened to increase ow as desired. If opening the valve increases
cycling rate, but does not increase ow rate, cavitation has occurred, and the valve

should be closed slightly.

For the most efcient use of compressed air and the longest diaphragm life, throttle
the air inlet to the lowest cycling rate that does not reduce ow.

AIR EXHAUST

If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump,
and be exhausted into the atmosphere. When pumping hazardous or toxic materials,
pipe the exhaust to an appropriate area for safe disposition.

This pump can be submerged if materials of construction are compatible with the
liquid. The air exhaust must be piped above the liquid level. Piping used for the air

exhaust must not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict air
ow and reduce pump performance. When the product source is at a higher level than
the pump (ooded suction), pipe the exhaust higher than the product source to prevent

siphoning spills.

Freezing or icing of the air exhaust can occur under certain temperature and humidity
conditions. Use of an air dryer should eliminate most icing problems.

BETWEEN USES

When used for materials that tend to settle out or transform to solid form, the pump

should be completely ushed after each use, to prevent damage. Product remaining

in the pump between uses could dry out or settle out. This could cause problems with
valves and diaphragms at re-start. In freezing temperatures, the pump must be drained
between uses in all cases.

CHECK VALVE SERVICING

Need for inspection or service is usually indicated by poor priming, unstable cycling,
reduced performance or the pump’s cycling but not pumping. (See Fig. 3)

Inspect the surfaces of both check valve and seat for wear or damage that could
prevent proper sealing. If pump is to prime properly, valves must seat air tight.

DIAPHRAGM SERVICING

Driver Diaphragms:

Drain the intermediate diaphragm housing (Item 36) by removing the pipe plug

directly beneath and behind the mounting ange. This port is also used for the optional

Electronic Leak Detector (Warren Rupp p/n 032-017-000 115 volt or p/n 032-018-000

220 volt). Remove four bolts securing the manifold ange to the chamber. Remove eight

nuts (Item 42) securing the inner diaphragm chamber (Item 22) and remove the outer
driver diaphragm assembly by pulling it axially off the studs. This permits inspection of
the Virgin PTFE diaphragm and the driver diaphragm. Pumping diaphragm chambers
need not be separated for access to the driver diaphragm. Loosen the plate which
secures the diaphragm and plate to the rod by keeping the diaphragm engaged with
the inner diaphragm chamber (Item 22) by inserting two or three capscrews through the
bolt holes so that the diaphragm cannot rotate when loosening. The diaphragm plates,
diaphragm and bumper will now come off the assembly. Repeat all actions if the other
diaphragm needs to be inspected or replaced.

NOTE: See “Filling of Driver Chamber with Liquid” for the correct procedure
to recharge the pump for operation.

Reassembly is the reverse of the tear down. During reassembly, be sure that the
rubber bumper is on the rod on each side (see Figure 5). Install the diaphragm with the
natural bulge to the outside as marked on the diaphragm. Install the heavier plate on the
outer side of the diaphragm. Be sure that the large radius side of each plate is toward the
diaphragm. Place the sealing washer between the inner diaphragm plate and the end
of the rod. Tighten the plate to approximately 25 ft. lbs. (33.89 Newton meters). Torque
while allowing the diaphragm to turn freely with the plate. Hold the opposite side with a
wrench on the plate to prevent rotation of the rod. If the opposite chamber is assembled,
this will not be necessary.

When reassembling the outer chambers and the manifold, the bolts securing the

manifold ange to the chamber should be snugged prior to tightening the manifold
ange. Finish tightening the manifold ange bolts after the chamber bolting is secured.

st1dl5sm-rev0614

Models ST1 & ST25 Page 5

Pumping Diaphragms:

It is recommended that the above procedure be followed to the point of removing
the pumping diaphragm assembly from the pumping unit. Remove eight hex nuts which
allow the outer diaphragm chamber to be lifted from the assembly exposing the PTFE
diaphragm. The PTFE diaphragm can now be lifted from the bolts. The black gasket
(Item 37) is designed to prevent movement and supplement the sealing of the PTFE
diaphragm to retain the driver liquid, and to seal the wetted chamber.

The reassembly should be in reverse as follows.

Install the rubber diaphragm gasket inside the hex head capsrews protruding through
inner chamber. Install PTFE diaphragm in place.

Snug down the outer diaphragm housing (Item 39) evenly torqued on all eight bolts,
alternating from one side to the other in the process. After this subassembly is completed
and reinstalled on the pump as it was removed, the pump should be tested prior to the
reinstallation on the job to make sure the capscrews and nuts are torqued down properly
to prevent leakage around the PTFE diaphragm surfaces. Do not overtighten these bolts.

PTFE has a tendency to cold ow. Torque at 200 inch/pounds (22.59 Newton meters).

A NOTE ABOUT AIR VALVE LUBRICATION

The SandPIPER pump’s pilot valve and main air valve assemblies are designed
to operate WITHOUT lubrication. This is the preferred mode of operation. There may
be instances of personal preference, or poor quality air supplies when lubrication of
the compressed air supply is required. The pump air system will operate with properly
lubricated compressed air supplies. Proper lubrication of the compressed air supply
would entail the use of an air line lubricator (available from Warren Rupp) set to deliver
one drop of 10 wt., non-detergent oil for every 20 SCFM of air the pump consumed at its
point of operation. Consult the pump’s published Performance Curve to determine this.

It is important to remember to inspect the sleeve and spool set routinely. It should
move back and forth freely. This is most important when the air supply is lubricated. If a
lubricator is used, oil accumulation will, over time, collect any debris from the compressed
air. This can prevent the pump from operating properly.

Water in the compressed air supply can create problems such as icing or freezing
of the exhaust air causing the pump to cycle erratically, or stop operating. This can be
addressed by using a point of use air dryer to supplement a plant’s air drying equipment.
This device will remove excess water from the compressed air supply and alleviate the
icing or freezing problem.

ESADS: EXTERNALLY SERVICEABLE AIR
DISTRIBUTION SYSTEM

Please refer to the exploded view drawing and parts list in the Service Manual
supplied with your pump. If you need replacement or additional copies, contact your
local Warren Rupp Distributor, or the Warren Rupp factory Literature Department at the
number shown below. To receive the correct manual, you must specify the MODEL and

TYPE in formation found on the name plate of the pump.

st1dl5sm-rev0614

Models ST1 & ST25 Page 6

MODELS WITH 1" SUCTION/DISCHARGE OR LARGER, AND
METAL CENTER SECTIONS

The main air valve sleeve and spool set is located in the valve body mounted on the
pump with four hex head capscrews. The valve body assembly is removed from the
pump by removing these four hex head capscrews.

With the valve body assembly off the pump, access to the sleeve and spool set is
made by removing four hex head capscrews (each end) on the end caps of the valve
body assembly. With the end caps removed, slide the spool back and forth in the sleeve.
The spool is closely sized to the sleeve and must move freely to allow for proper pump
operation. An accumulation of oil, dirt or other contaminants from the pump’s air sup­ply, or from a failed diaphragm, may prevent the spool from moving freely. This can
cause the spool to stick in a position that prevents the pump from operating. If this is
the case, the sleeve and spool set should be removed from the valve body for cleaning
and further inspection.

Remove the spool from the sleeve. Using an arbor press or bench vise (with an
improvised mandrel), press the sleeve from the valve body. Take care not to damage
the sleeve. At this point, inspect the o-rings on the sleeve for nicks, tears or abrasions.
Damage of this sort could happen during assembly or servicing. A sheared or cut o­ring can allow the pump’s compressed air supply to leak or bypass within the air valve
assembly, causing the pump to leak compressed air from the pump air exhaust or not
cycle properly. This is most noticeable at pump dead head or high discharge pressure
conditions. Replace any of these o-rings as required or set up a routine, preventive
maintenance schedule to do so on a regular basis. This practice should include clean­ing the spool and sleeve components with a safety solvent or equivalent, inspecting for
signs of wear or damage, and replacing worn components.

To re-install the sleeve and spool set, lightly lubricate the o-rings on the sleeve with
an o-ring assembly lubricant or lightweight oil (such as 10 wt. air line lubricant). Press
the set into the valve body easily, without shearing the o-rings. Re-install one end cap,
gasket and bumper on the valve body. Using the arbor press or bench vise that was used
in disassembly, press the sleeve back into the valve body. You may have to clean the
surfaces of the valve body where the end caps mount. Material may remain from the old
gasket. Old material not cleaned from this area may cause air leakage after reassembly.
Take care that the bumper stays in place allowing the sleeve to press in all the way.
Re-install the spool, keeping the counter-bored end toward you, and install the spring
and the opposite end cap, gasket and bumper on the valve body. After inspecting and
cleaning the gasket surfaces on the valve body and intermediate, re-install the valve
body on the pump using new gaskets. Tighten the four hex head capscrews evenly and
in an alternating cross pattern.

PILOT VALVE

The pilot valve assembly is accessed by removing the main air distribution valve body
from the pump and lifting the pilot valve body out of the intermediate housing (see Figure 8).

Most problems with the pilot valve can be corrected by replacing the o-rings. Always
grease the spool prior to inserting it into the sleeve. If the sleeve is removed from
the body, reinsertion must be at the chamfered side. Grease the o-rings to slide the
sleeve into the valve body. Securely insert the retaining ring around the sleeve. When
reinserting the pilot valve, push both plungers (located inside the intermediate bracket)
out of the path of the pilot valve spool ends to avoid damage.

PILOT VALVE ACTUATOR

Bushings for the pilot valve actuators are held in the inner chambers wth
retaining rings. An o-ring is behind each bushing. If the plunger has any sideways
motion check o-rings and bushings for deterioration/wear. The plunger may be removed for
inspection or replacement. First remove the air distribution valve body and the pilot valve
body from the pump. The plungers can be located by looking into the intermediate. It may

be necessary to use a ne piece of wire to pull them out. The bushing can be removed

from the inner chamber by removing the outer chamber assembly. Replace the bushings
if pins have bent (see Figure 9 and Figure 10).

st1dl5sm-rev0614

Models ST1 & ST25 Page 7

FILLING OF DRIVER CHAMBER WITH LIQUID

The driver chambers are lled at the factory with distilled water.
If you need to substitute another liquid to prevent system contamination, rst consult

the factory for chemical compatibility with pump construction.

Follow the steps listed below to replace the liquid in the pump after disassembly or

liquid loss:

1. Filling is accomplished through the pipe plugs at the top of the liquid chamber.

Drain ports are at the bottom of the liquid chamber.

2. After the driver uid has been emptied from the pump, the driver diaphragms will

naturally come to center.

3. Remove the entire manifold assembly exposing the ports in the outer diaphragm

chambers.

4. Fill either side with 722 MI. or 24.6 uid oz. by volume with the driver liquid. It is

imperative that the driver liquid chambers be lled with the correct amount of driver liquid

as too little or too much will cause premature diaphragm failure and erratic pumping.

5. After lling with the proper amount of liquid, if the liquid does not come to the top
of the ll hole, pressure should be applied to the PTFE diaphragm with a blunt tool
through the material ow port in the outer chamber until the liquid comes to the top. If

the main air valve body and pilot valve are removed, the diaphragm rod will be visible in
the intermediate bracket. The hole in the diaphragm rod will assist manual movement.
Use a long taper punch to move the diaphragm rod.

6. When the driver uid rises to the top of the ll plug hole, apply pipe dope to the

pipe plug, and thread it into the chamber plug hole. (Do not use PTFE tape.) Keep
pressure on the PTFE diaphragm until the pipe plug is tight to prevent air from drawing
back into the chamber.

7. Repeat the lling procedure for opposite side.

TROUBLESHOOTING

1. Pump will not cycle

A. Check to make sure the unit has enough pressure to operate and that the air inlet
valve is open.
B. Check the discharge line to insure that the discharge line is neither closed nor blocked.
C. If the spool in the air distribution valve is not shifting, check the main spool. It must
slide freely.
D.

Excessive air leakage in the pump can prevent cycling. This condition will be evident.
Air leakage into the discharge line indicates a ruptured diaphragm. Air leakage from the
exhaust port indicates leakage in the air distribution valve. See further service instructions.
E. Blockage in the liquid chamber can impede movement of diaphragm.

2. Pump cycles but will not pump

A. Suction side of pump pulling in air. Check the suction line for air leaks and be sure

that the end of the suction line is submerged. Check ange bolting. Check valve anges
and manifold to chamber ange joints.

B. Make certain the suction line or strainer is not plugged. Restriction at the suction is
indicated by a high vacuum reading when a vacuum gauge is installed in the suction line.
C. Check valves may not be seating properly. To check, remove the suction line and
cover the suction port with your hand. If the unit does not pull a good suction (vacuum),
the check valves should be inspected for proper seating.
D. Static suction lift may be too high. Priming can be improved by elevating the suction
and discharge lines higher than the check valves and pouring liquid into the unit through
the suction inlet. When priming at high suction lifts or with long suction lines operate the
pump at maximum cycle rate.
E. Incorrect driver uid level or unpurged air in the chamber can cause poor
performance.

3. Low performance

A. Capacity is reduced as the discharge pressure increases, as indicated on the
performance curve. Performance capability varies with available inlet air supply. Check
air pressure at the pump inlet when the pump is operating to make certain that adequate
air supply is maintained.
B. Check vacuum at the pump suction. Capacity is reduced as vacuum increases.

Reduced ow rate due to starved suction will be evident when cycle rate can be varied

without change in capacity. This condition will be more prevalent when pumping viscous
liquids. When pumping thick, heavy materials the suction line must be kept as large in
diameter and as short as possible, to keep suction loss minimal.

st1dl5sm-rev0614

Models ST1 & ST25 Page 8

C. Low ow rate and slow cycling rate indicate restricted ow through the discharge line.
Low ow rate and fast cycling rate indicate restriction in the suction line or air leakage

into suction.
D. Unstable cycling indicates improper check valve seating on one chamber. This

condition is conrmed when unstable cycling repeats consistently on alternate exhausts.

Cycling that is not consistently unstable may indicate partial exhaust restriction due
to freezing and thawing of exhaust air. Use of an anti-freeze lubricant in an air line
lubricator should solve this problem.
E. Incorrect driver uid level or unpurged air in the chamber can cause poor
performance.

For additional information, see the Warren Rupp Troubleshooting Guide.

WARRANTY

This pump is warranted for a period of ve years against defective material and

workmanship. Failure to comply with the recommendations stated in this manual voids
all factory warranty.

RECOMMENDED WARREN RUPP ACCESSORIES TO

MAXIMIZE PUMP PERFORMANCE:

• Tranquilizer® Surge Suppressor: For nearly pulse-free ow.

®

• Warren Rupp

convenience.

• Warren Rupp Speed Control: For manual or programmable process

control. (Manual adjustment or 4-20mA reception.)

For more detailed information on these accessories, contact your local Warren
Rupp Factory-Authorized Distributor.

st1dl5sm-rev0614

Filter/Regulator: For modular installation and service

Models ST1 & ST25 Page 9

Safety Information

IMPORTANT

Read the safety warnings and instructions in this manual
before pump installation and start-up. Failure to comply with
the recommendations stated in this manual could damage the
pump and void factory warranty.

When the pump is used for materials that tend to settle out

or solidify, the pump should be ushed after each use to

prevent damage. In freezing temperatures the pump should be
completely drained between uses.

CAUTION

Before pump operation, inspect all fasteners for loosening

caused by gasket creep. Retighten loose fasteners to prevent
leakage. Follow recommended torques stated in this manual.

Nonmetallic pumps and plastic components are not UV
stabilized. Ultraviolet radiation can damage these parts and
negatively affect material properties. Do not expose to UV light
for extended periods of time.

WARNING
Pump not designed, tested or certied to be powered by
compressed natural gas. Powering the pump with natural
gas will void the warranty.

WARNING

When used for toxic or aggressive uids, the pump should
always be ushed clean prior to disassembly.

Before maintenance or repair, shut off the compressed air line,
bleed the pressure, and disconnect the air line from the pump.

Be certain that approved eye protection and protective clothing
are worn at all times. Failure to follow these recommendations
may result in serious injury or death.

Airborne particles and loud noise hazards. Wear eye and ear
protection.

In the event of diaphragm rupture, pumped material may enter
the air end of the pump, and be discharged into the atmosphere.
If pumping a product that is hazardous or toxic, the air exhaust

must be piped to an appropriate area for safe containment.

Take action to prevent static sparking. Fire or explosion can

result, especially when handling ammable liquids. The pump,
piping, valves, containers and other miscellaneous equipment

must be properly grounded.

This pump is pressurized internally with air pressure during
operation. Make certain that all fasteners are in good condition
and are reinstalled properly during reassembly.

kg

Use safe practices when lifting

RECYCLING

Many components of SANDPIPER® AODD pumps are made

of recyclable materials (see chart on page 12 for material

specications). We encourage pump users to recycle worn out parts
and pumps whenever possible, after any hazardous pumped uids
are thoroughly ushed.

st1dl5sm-rev0614

Models ST1 & ST25 Page 10

Grounding The Pump

One eyelet is installed to a true earth ground.

One eyelet is fastened to the pump hardware.

WARNING

Take action to prevent static sparking.
Fire or explosion can result, especially

when handling ammable liquids. The

pump, piping, valves, containers or

other miscellaneous equipment must
be grounded.

This 8 foot long (244 centimeters) Ground
Strap, part number 920-025-000 can be
ordered as a service item.

To reduce the risk of static electrical sparking, this pump must be grounded.
Check the local electrical code for detailed grounding instruction and the
type of equipment required, or in the absence of local codes, an industry

or nationally recognized code having juristiction over specic installations.

st1dl5sm-rev0614

Models ST1 & ST25 Page 11

MATERIAL CODES

THE LAST 3 DIGITS OF PART NUMBER

000 Assembly, sub-assembly;

and some purchased items

010 Cast Iron

012 Powered Metal

015 Ductile Iron

020 Ferritic Malleable Iron
025 Music Wire
080 Carbon Steel, AISI B-1112

100 Alloy 20
110 Alloy Type 316 Stainless Steel
111 Alloy Type 316 Stainless Steel

(Electro Polished)

112 Alloy C
113 Alloy Type 316 Stainless Steel

(Hand Polished)

114 303 Stainless Steel

115 302/304 Stainless Steel
117 440-C Stainless Steel (Martensitic)

120 416 Stainless Steel

(Wrought Martensitic)

123 410 Stainless Steel

(Wrought Martensitic)
148 Hardcoat Anodized Aluminum
149 2024-T4 Aluminum
150 6061-T6 Aluminum
151 6063-T6 Aluminum
152 2024-T4 Aluminum (2023-T351)

154 Almag 35 Aluminum

155 356-T6 Aluminum
156 356-T6 Aluminum

157 Die Cast Aluminum Alloy #380

158 Aluminum Alloy SR-319
159 Anodized Aluminum
162 Brass, Yellow, Screw Machine Stock
165 Cast Bronze, 85-5-5-5
166 Bronze, SAE 660
170 Bronze, Bearing Type, Oil Impregnated

175 Die Cast Zinc
180 Copper Alloy

305 Carbon Steel, Black Epoxy Coated
306 Carbon Steel, Black PTFE Coated
307 Aluminum, Black Epoxy Coated
308 Stainless Steel, Black PTFE Coated
309 Aluminum, Black PTFE Coated
310 PVDF Coated
313 Aluminum, White Epoxy Coated
330 Zinc Plated Steel
331 Chrome Plated Steel
332 Aluminum, Electroless Nickel Plated
333 Carbon Steel, Electroless

Nickel Plated
335 Galvanized Steel
336 Zinc Plated Yellow Brass
337 Silver Plated Steel
340 Nickel Plated
342 Filled Nylon
351 Food Grade Santoprene; Color: NATURAL

353 Geolast; Color: BLACK
354 Injection Molded #203-40

Santoprene- Duro 40D +/-5; Color: RED

355 Thermal Plastic

356 Hytrel; Color: BLUE
357 Injection Molded Polyurethane;

Color: GREEN

358 Urethane Rubber; Color: NATURAL

(Some Applications)

(Compression Mold)
359 Urethane Rubber; Color: NATURAL
360 Nitrile Rubber; Color Coded: RED
361 Nitrile
363 FKM (Fluorocarbon).

Color Coded: YELLOW
364 E.P.D.M. Rubber. Color Coded: BLUE
365 Neoprene Rubber;

Color Coded: GREEN
366 Food Grade Nitrile; Color: WHITE
368 Food Grade EPDM; Color: GRAY
370 Butyl Rubber

Color Coded: BROWN
371 Philthane (Tuftane)
374 Carboxylated Nitrile
375 Fluorinated Nitrile

378 High Density Polypropylene

379 Conductive Nitrile;

Color Coded: RED & SILVER
384 Conductive Neoprene;

Color Coded: GREEN & SILVER
405 Cellulose Fibre
408 Cork and Neoprene
425 Compressed Fibre
426 Blue Gard
440 Vegetable Fibre
465 Fibre

500 Delrin 500
501 Delrin 570

502 Conductive Acetal, ESD-800;
Color: BLACK
503 Conductive Acetal, Glass-Filled
Color: BLACK; Color Coded: YELLOW

505 Acrylic Resin Plastic
506 Delrin 150

520 Injection Molded PVDF; Color: NATURAL
521 Injection Molded Conductive PVDF;

Color: BLACK; Color Coded: LIGHT

GREEN
540 Nylon
541 Nylon
542 Nylon
544 Nylon Injection Molded

550 Polyethylene

551 Glass Filled Polypropylene; Color: BLACK
552 Unlled Polypropylene; Color: NATURAL
555 Polyvinyl Chloride
556 Black Vinyl

557 Conductive Polypropylene;

Color: BLACK; Color Coded: SILVER
558 Conductive HDPE; Color: BLACK
Color Coded: SILVER
559 Conductive Polypropylene; Color: BLACK
Color Coded: SILVER

570 Rulon II
580 Ryton
590 Valox

591 Nylatron G-S
592 Nylatron NSB
600 PTFE (virgin material)

Tetrauorocarbon (TFE)
601 PTFE (Bronze and moly lled)
602 Filled PTFE
603 Blue Gylon
604 PTFE
606 PTFE
607 Envelon
608 Conductive PTFE; Color: BLACK
610 PTFE Encapsulated Silicon
611 PTFE Encapsulated FKM
632 Neoprene/Hytrel
633 FKM/PTFE
634 EPDM/PTFE
635 Neoprene/PTFE
637 PTFE , FKM/PTFE
638 PTFE , Hytrel/PTFE
639 Nitrile/TFE

643 Santoprene®/EPDM
644 Santoprene®/PTFE

656 Santoprene Diaphragm and

Check Balls/EPDM Seats
661 EPDM/Santoprene
666 FDA Nitrile Diaphragm,

PTFE Overlay, Balls, and Seals
668 PTFE, FDA Santoprene/PTFE

Delrin is a registered
tradename of E.I. DuPont.

Gylon is a registered tradename
of Garlock, Inc.

Nylatron is a registered tradename

of Polymer Corp.

Santoprene is a registered tradename
of Exxon Mobil Corp.

Rulon II is a registered tradename
of Dixion Industries Corp.

Ryton is a registered tradename

of Phillips Chemical Co.

Valox is a registered tradename
of General Electric Co.

PortaPump, Tranquilizer and SludgeMaster are
registered tradenames of Warren Rupp, Inc.

st1dl5sm-rev0614

Models ST1 & ST25 Page 12

II 2GD T5

SERVICE & OPERATING MANUAL

Original Instructions

Model ST1 Type 5

See pages 17 & 18
for ATEX ratings

ITEM
NO. PART NO. DESCRIPTION QTY.

2 165-042-157 Cap, Valve Body 1

3 170-063-115 Capscrew, Hex Head 1
4 901-035-115 Washer, Flat 7
5 542-001-115 Nut, Square 1
6 170-033-115 Capscrew, Hex Head 4
7 901-005-115 Washer, Flat 4

8 360-058-360 Gasket, Valve Cap 1

9 095-051-557 Body, Spool Valve 1

10 031-083-000 Sleeve & Spool Set w/Pins 1
11 165-078-147 Cap, End 2
12 675-043-115 Ring, Retaining 2
13 560-058-360 O-Ring 8

14 530-036-000 Mufer 1

15 360-057-360 Gasket 1
16 095-074-001 Pilot Valve Body Assembly1 1
16-A 095-071-557 Pilot Valve Body 1
16-B 755-025-000 Sleeve (with O-Ring) 1
16-C 560-033-360 O-Ring (Sleeve) 4
16-D 775-014-000 Spool (with O-Ring) 1
16-E 560-023-360 O-Ring (Spool) 4
16-F 675-037-080 Retaining Ring 1
17 360-056-379 Gasket 1
18 114-007-157 Bracket, Intermediate 1
19 560-040-360 O-Ring 2
20 675-040-360 Ring, Sealing 2
21 170-043-115 Capscrew, Hex Head 6

22 196-043-157 Chamber, Inner 1
23 196-042-157 Chamber, Inner 1
24 070-012-170 Bearing, Sleeve 2

25 720-010-375 Seal, U-Cup 2
26 560-001-379 O-Ring 2
27 135-034-506 Bushing 2
28 675-042-115 Ring, Retainer 2
29 620-007-114 Plunger, Actuator 2
30 685-039-120 Rod, Diaphragm 1
31 901-012-180 Washer, Sealing 2
32 132-019-360 Bumper, Diaphragm 2
33 612-022-330 Plate, Inner 2
34 286-008-365 Diaphragm 2
286-008-363 Diaphragm 2

35 612-101-110 Plate, Outer 2
36 196-023-000 Chamber Assembly 2

37 360-039-365 Gasket, Diaphragm 2
360-039-363 Gasket, Diaphragm 2

38 286-009-604 Diaphragm 2

38 286-009-604 Diaphragm 2

1

Available in Kit Form. Order P/N 031-060-000 which includes items 8, 15, 17, 29, 45.

Model ST25 Type 5

Repair Parts shown in bold face (darker)
type are more likely to need replacement
after extended periods of normal use. The
pump owner may prefer to maintain a limited
inventory of these parts in his own stock to
reduce repair downtime to a minimum.

IMPORTANT: When ordering repair parts
always furnish pump model number, serial
number and type number.

st1dl5sm-rev0614

Models ST1 & ST25 Page 13

ITEM
NO. PART NUMBER DESCRIPTION QTY.

39 196-021-110 Chamber, Outer 2

196-021-156 Chamber, Outer 2
40 170-029-115 Capscrew, Hex Head 16
41 900-004-115 Washer, Lock 26
42 545-004-115 Nut, Hex 42
43 618-003-110 Pipe, Plug 8
44 115-071-080 Brk’t. Foot, Base 1
45 132-022-360 Bumper 2
46 350-002-360 Foot, Rubber 4
47 706-013-330 Screw, Machine 4
48 547-002-330 Nut, Stop 4
49 170-045-115 Capscrew, Hex Head 4
50 905-001-015 Washer, Taper 4

51 360-030-600 Gasket, Manifold 2
52 171-010-115 Capscrew, Flanged 4

53 170-047-332 Capscrew, Hex Head 6
54 334-013-157 Porting Flange 2
334-013-110 Porting Flange 2
334-013-157E Porting Flange (BSP) 2
334-013-110E Porting Flange (BSP) 2

55 360-115-608 Gasket, Flange 4
56 050-011-600 Ball, Check Valve 4
57 722-102-110 Seat, Check Ball (Discharge) 2

58 518-020-110 Manifold 1
518-020-156 Manifold 1
60 807-024-115 Stud 16
61 618-003-330 Pipe Plug 3
65 286-015-604 Diaphragm, Overlay 2
66 132-028-552 Bumper, Spool 2
68 210-008-330 Clip, Safety 1
69 560-029-360 O-Ring 2

70 255-012-335 Coupling 3/4" NPT (Exhaust Port) 1

ITEMS NOT SHOWN:

031-111-557 Valve Body Assembly
(Includes items 9, 10,
11, 12, 13, 66, 68 & 69) 1

Repair Parts shown in bold face (darker)
type are more likely to need replacement
after extended periods of normal use. The
pump owner may prefer to maintain a limited
inventory of these parts in his own stock to
reduce repair downtime to a minimum.

IMPORTANT: When ordering repair parts
always furnish pump model number, serial
number and type number.

st1dl5sm-rev0614

Models ST1 & ST25 Page 14

NOTE: Usual installation for the outer chamber and
manifold is 180° from the view shown.

12

11

66

13

9

69

10

13

68

©2010 Warren Rupp, Inc. All rights reserved.

®Sandpiper and Tranquilizer are registered tradenames of Warren Rupp,, Inc.

®Neverseize is a registered tradename of Loctite.

Printed in U.S.A.

st1dl5sm-rev0614

OVERLAY UNITS

Models ST1 & ST25 Page 15

Declaration of Conformity

Manufacturer:

®

Warren Rupp, Inc.

Mansfield, Ohio, 44902 USA

certifies that Air-Operated Double Diaphragm Pump Series: HDB, HDF,

M Non-Metallic, S Non-Metallic, M Metallic, S Metallic, T Series, G Series, RS Series

U Series, EH and SH High Pressure, W Series, SMA and SPA Submersibles,

and Tranquilizer Surge Suppressors comply with the European Community

Directive 2006/42/EC on Machinery, according to Annex VIII. This product

has used Harmonized Standard EN809:1998+A1:2009, Pumps and Pump Units

for Liquids - Common Safety Requirements, to verify conformance.

Signature of authorized person

, 800 N. Main Street

October 20, 2005
Date of issue

David Roseberry
Printed name of authorized person

Revision Level: F

Engineering Manager
Title

April 19, 2012
Date of revision

EC Declaration of Conformity

In accordance with ATEX Directive 94/9/EC,

Equipment intended for use in potentially explosive environments.

Manufacturer:

Warren Rupp, Inc.
A Unit of IDEX Corportion
800 North Main Street
P.O. Box 1568
Mansfield, OH 44902 USA

EN 60079-25: 2011

For pumps equipped with Pulse Output ATEX Option
Quality B.V. (0344)

AODD Pumps and Surge Suppressors

For Type Examination Designations, see page 2 (back)

AODD (Air-Operated Double Diaphragm) Pumps

EC Type Examination Certificate No. Pumps: KEMA 09ATEX0071 X

DEKRA Certification B.V. (0344)
Meander 1051
6825 MJ Arnhem
The Netherlands

®

Applicable Standard:

EN13463-1: 2009
EN13463-5: 2011

DATE/APPROVAL/TITLE:
14 MAY 2014

David Roseberry, Engineering Manager

EC Declaration of Conformity

ATEX Summary of Markings

Type Marking Listed In

Pump types, S1F, S15, S20,
and S30 provided with the
pulse output option

Pump types, S1F, S15, S20,
and S30 provided with the
integral solenoid option

Pump types, HDB1½, HDB40,
HDB2, HDB50, HDB3, HDF1,
HDF25, HDF2, HDF3M, PB¼,
S05, S1F, S15, S20, S30, SB1,
SB25, ST1½, ST40, G15, G20,
and G30, without the above
listed options, no aluminum
parts

Pump types, DMF2, DMF3,
HDB1½, HDB40, HDB2,
HDB50, HDB3, HDF1, HDF25,
HDF2, HDF3M, PB¼, S05, S1F,
S15, S20, S30, SB1, SB25,
SE½, ST1, ST25, ST1½, ST40,
U1F, G05, G1F, G15, G20, and
G30

Surge Suppressors all types II 2 G T5

EC Type Certificate No. Pumps: KEMA 09ATEX0071 X
Type Certificate No. Pumps: KEMA 09ATEX0072 X
Type Certificate No. Suppressors: KEMA 09ATEX0073

II 2 G Ex ia c IIC T5
II 3/2 G Ex ia c IIC T5
II 2 D

Ex c iaD 20 IP67 T100oC

II 2 G EEx m c II T5
II 3/2 G EEx m c II T5
II 2 D c IP65 T100

II 1 G c T5
II 3/1 G c T5
II 1 D c T100
I M1 c
I M2 c

II 2 G c T5
II 3/2 G c T5
II 2 D c T100

II 3/2 G T5
II 2 D T100

Non-Conductive

Fluids

KEMA 09ATEX0071 X
CE 0344

KEMA 09ATEX0071 X

o

C

o

C

o

C

o

C

CE 0344

KEMA 09ATEX0071 X
KEMA 09ATEX0072 X
CE 0344

KEMA 09ATEX0072 X
CE

KEMA 09ATEX0073
CE

KEMA 09ATEX0071 X
KEMA 09ATEX0071 X
KEMA 09ATEX0071 X

KEMA 09ATEX0071 X
KEMA 09ATEX0071 X
KEMA 09ATEX0071 X

KEMA 09ATEX0071 X
KEMA 09ATEX0071 X
KEMA 09ATEX0071 X
KEMA 09ATEX0071 X
KEMA 09ATEX0072 X

KEMA 09ATEX0072 X
KEMA 09ATEX0072 X
KEMA 09ATEX0072 X

KEMA 09ATEX0073
KEMA 09ATEX0073
KEMA 09ATEX0073

No
Yes
Yes

No
Yes
Yes

No
Yes
Yes

No
Yes

No
Yes
Yes

No
Yes
Yes

Pumps marked with equipment Category II 3/1 G (internal 3 G /
eternal 1 G), 1D, M1 and M2 when used for non-conductive fluids.
The pumps are Category II 2 G when used for conductive fluids.

Pumps and surge suppressors marked with equipment Category II 3/2
(internal 3 G / external 2 G), 2D when used for non-conductive fluids.
The pumps are Category II 2 G when used for conductive fluids.