Emerson Y692 Instruction Manual

Instruction Manual
Form 5347

August 2009

Type Y692

Type Y692 Low-Pressure Gas Blanketing Regulator

WARNING

!

Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,

re and/or chemical contamination

causing property damage and personal
injury or death.

Fisher® regulators must be installed,
operated, and maintained in accordance
with federal, state, and local codes,
rules and regulations, and Emerson
Process Management Regulator
Technologies Inc. instructions.

If the regulator vents gas or a leak
develops in the system, service to the unit
may be required. Failure to correct trouble
could result in a hazardous condition.

Installation, operation, and maintenance

procedures performed by unqualied

personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment

damage or personal injury. Use qualied

personnel when installing, operating,
and maintaining the Type Y692 Low­Pressure Gas Blanketing Regulator.

Introduction

Scope of the Manual

This instruction manual provides installation, startup,
maintenance, and parts ordering information for the
Type Y692 Low-Pressure Gas Blanketing Regulator.

W5930

Figure 1. Type Y692 Low-Pressure Gas Blanketing Regulators

operated regulator with internal registration or external
pressure registration. It is used for accurate pressure
control on very low-pressure blanketing systems.
Blanketing with low-pressure gas helps prevent
corrosion, helps control emissions from the blanketed
product and helps protect against any contamination to
the blanketed product by atmospheric conditions.

The regulator will maintain a positive vessel
pressure reducing the possibility of vessel wall
collapse. The Type Y692 is available in NPS 1-1/2
and 2 (DN 40 and 50) body sizes.

Type Y692 with external pressure registration
regulators have a stem seal with O-rings and a
1/2 NPT control line connection in the diaphragm
case. The control line can be used to more accurately
control the pressure in the tank if the regulator is
mounted an extended distance from the control point.
The stem seal separates the body outlet pressure from
the diaphragm case.

Specications

Product Description

The Accu-Pressure™ Type Y692 Gas Blanketing
Regulator (Figure 1) is a pressure reducing direct-

www.emersonprocess.com/regulators

The Specications section lists specications for
Type Y692 Gas Blanketing Regulator. Specications

for a given regulator as it originally comes from the
factory are stamped on the spring case nameplate.

D102031X012

Type Y692

Specications

Available Congurations

Direct-operated pressure reducing regulator with
external or internal pressure registration with
seven outlet (control) pressure ranges from
1-inch w.c. to 7 psig (2 mbar to 0,48 bar).
Available in NPS 1-1/2 and 2 (DN 40 and 50)
body sizes.

Body Sizes and End Connection Styles

(1)(2)

Cast Iron: NPS 1-1/2 (DN 40), NPT

NPS 2 (DN 50), NPT or CL125 FF

Steel: NPS 1-1/2 or 2 (DN 40 or 50), NPT, SWE,

CL150 RF, CL300 RF, or PN 16/25/40

Stainless Steel: NPS 1-1/2 or 2 (DN 40 or 50), NPT,

CL150 RF, CL300 RF, or PN 16/25/40

Maximum Allowable Inlet Pressure

(1)

150 psig (10,3 bar) or body rating limit

Maximum Control (Casing) Pressure

(1)

15 psig (1,0 bar)

Control Pressure Ranges

(1)

See Table 1

Orices Sizes and Flow Coefcients

See Table 2

IEC Sizing Coefcients

See Table 3

Pressure Registration
Internal (standard) or External

Maximum Operating Control Pressure to Avoid
Internal Part Damage

(1)

3 psig (0,21 bar) above control pressure setting

Temperature Capabilities

(1)

Nitrile (NBR): -20° to 180°F (-29° to 82°C)
Fluorocarbon (FKM): 0° to 300°F (-18° to 149°C)
Ethylenepropylene (EPDM):-20° to 275°F

(-29° to 135°C)
Peruoroelastomer (FFKM): -20° to 300°F
(-29° to 149°C)

Spring Case Connection

1/4 NPT

Approximate Weights

Cast Iron Body: 45 pounds (20 kg)
Steel/Stainless Steel Body: 57 pounds (26 kg)

1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.

Table 1. Control Pressure Ranges

CONTROL PRESSURE RANGES WITH

CASE BARREL POINTED DOWN

1 to 3-inches w.c. (2 to 7 mbar)

3 to 11-inches w.c. (7 to 27 mbar)

Light Spring

Assembly

Heavy spring

Assembly

1. Install with spring case pointing down to achieve low setpoints in these spring ranges.

2. Do not use uorocarbon (FKM) diaphragm with these springs at diaphragm temperature lower than 60°F (16°C).

3. Installation with spring case pointing up will change outlet (control) pressure range to 3 to 5-inches w.c. (7 to 12 mbar).

4. Installation with spring case pointing up will change outlet (control) pressure range to 5.75 to 14-inches w.c. (14 to 35 mbar).

5. Installation with spring case pointing up will change outlet (control) pressure range to 7.5-inches w.c. to 1.3 psig (19 to 90 mbar).

6.5-inches w.c. to 1.2 psig (16 mbar to

0.7 to 2 psig (0,05 to 0,14 bar)
1 to 3.2 psig (0,07 to 0,22 bar)

2 to 5.5 psig (0,14 to 0,38 bar)

4 to 7 psig (0,28 to 0,48 bar)

0,08 bar)

(5)

CONTROL SPRING

COLOR CODE

(2)(3)

(2)(4)

Metallic with green stripe

Metallic (silver)

Brown

Iridite

Green

Blue

Orange

CONTROL SPRING

PART NUMBER

1D892527022
0B019727052
0B019427052
0B019627032
0A081127202

0Y066427022
1H802427032

SPRING WIRE

DIAMETER,

INCHES (mm)

0.109 (2,77)

0.148 (3,76)

0.187 (4,75)

0.225 (5,71)

0.250 (6,35)

0.363 (9,22)

0.406 (10,3)

Table 2. Orice Sizes and Flow Coefcients

BODY SIZES, NPS (DN)

1-1/2 and 2 (40 and 50)

ORIFICE SIZES,

INCHES (mm)

1/4

(6,4)

3/8

(9,5)

1/2

(13)

3/4

(19)

1

(25)

1-3/16

(30)

WIDE-OPEN C

1.51

3.14

5.43

11.9
20
26

V

WIDE-OPEN C

53.0

111.0

190.0

415.0

700.0

910.0

g

SPRING FREE

LENGTH,

INCHES (mm)

6.12 (155)

6.00 (152)

6.00 (152)

6.00 (152)

6.00 (152)

6.00 (152)

6.00 (152)

C

1

35

Table 3. IEC Sizing Coefcients

X

T

0.775 0.50 0.89

2

F

D

F

L

Type Y692

M1042

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

July 2007

Type Y692

BLOCK

Type Y692

M1042

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

July 2007

Type Y692

VALVE

SUPPLY
PRESSURE

VENT
VALVE

BLOCK
VALVE

SUPPLY

PRESSURE

VENT
VALVE

Type Y692

A6340

INLET PRESSURE

CONTROL PRESSURE

ATMOSPHERIC PRESSURE

Figure 2. Type Y692 with Internal Registration

Principle of Operation

The Type Y692 Gas Blanketing Regulator reduces a
high-pressure gas to maintain a positive low-pressure
of blanket gas over a stored liquid when the liquid is
being pumped out of the vessel (see Figures 2 and

3). Also when the vessel (or tank) is suddenly cooled,
causing vapors to contract, the regulator replaces
the volume of contracting vapors with a volume of
blanketing gas to prevent the internal vessel pressure
from decreasing. In both cases, a positive vessel
pressure prevents outside air from entering the vessel
and reduces the possibility of atmospheric pressure
collapsing the vessel.

Gas blanketing regulators respond to a slight decrease
in internal vessel pressure by throttling open to

increase the ow rate of gas into the vessel. When the

vessel’s liquid level has been lowered to the desired
point and the vapor pressure re-established, the
regulator throttles closed.

VENT
VALVE

BLOCK
VALVE

GAS BLANKETING PRESSURE

LIQUID

Operational Schematic

VENT

POINTED

DOWNWARD

VENT
VALVE

BLOCK
VALVE

GAS BLANKETING PRESSURE

LIQUID

INLET PRESSURE

CONTROL PRESSURE

ATMOSPHERIC PRESSURE

Figure 3. Type Y692 with External Registration

Operational Schematic

VENT

POINTED

DOWNWARD

When the liquid level drops and vessel pressure
decreases below the setting of the control spring,
the spring force on the diaphragm opens the disk

assembly to supply the required ow of gas to the
vessel. When vessel pressure has been satised,

control pressure tends to increase slightly, acting on
the diaphragm. When the control (vessel) pressure
exceeds the control spring setting, the diaphragm
moves to close the disk assembly.

The Type Y692 Gas Blanketing Regulator provides
a constant set pressure for accurate gas blanketing.
When vessel pressure decreases below the control
spring setpoint, the force of the spring moves the disk

away from the orice allowing gas to ow into the

vessel. As the vessel pressure increases, the increase
is sensed by the diaphragm through the pitot tube or
control line. This movement of the diaphragm causes

the disk to move toward the orice, decreasing the
ow of blanketing gas. When the vessel pressure

reaches the system setpoint, the disk will seat against

the orice shutting off the ow of gas.

3

Type Y692

Installation

WARNING

!

Personal injury, equipment damage, or
leakage due to escaping accumulated
gas or bursting of pressure-containing
parts may result if the gas blanketing
regulator is overpressured or installed
where service conditions could exceed

the limits given in Specications

section, or where conditions exceed
any ratings of the adjacent piping or
piping connections. To avoid such
injury or damage, provide pressure­relieving or pressure-limiting devices
(as required by Title 49, Part 192, of the
U.S. Code of Federal Regulations, by
the National Fuel Gas Code Title 54 of
the National Fire Codes of the National
Fire Protection Association, or by other
applicable codes) to prevent service
conditions from exceeding those limits.

Additionally, physical damage to the
gas blanketing regulator could result in
personal injury and property damage
due to escaping accumulated gas. To
avoid such injury and damage, install
the gas blanketing regulator in a safe
and well ventilated location.

1. Use qualied personnel when installing, operating,

and maintaining the regulator. Before installing,
inspect the regulator for any shipment damage
or foreign material that may have collected during
crating and shipment. Make certain the body
interior is clean and the pipelines are free of
foreign material. Apply pipe compound only to the
external pipe threads.

2. To achieve the published capacities, install the
regulator as close as possible to the blanketed
vessel using a straight run of pipe the same size
or larger as the regulator body. Flow through the

regulator body is indicated by the ow arrow cast

on the body. If a block valve is required, install a full

ow valve between the regulator and the blanketed

vessel. For proper operation, the regulator
must be installed with the spring case barrel
pointed down (as shown in Figures 2 and 3).

Key numbers referenced in this section are shown

in Figure 6.

WARNING

!

If the regulator vents some gas or a leak
develops in the system, it indicates that
service is required. Failure to take the
regulator out of service immediately
may create a hazardous condition. In

hazardous or ammable gas service,

vented gas may accumulate, and cause
personal injury, death, or property damage

due to re or explosion. Vent a regulator

in hazardous gas service to a remote,
safe location away from air intakes or
any hazardous location. The vent line or
stack opening must be protected against
condensation or clogging.

3. To keep the spring case vent from being plugged
or the spring case from collecting moisture,
corrosive chemicals, or other foreign material,
point the vent down or otherwise protect it.

4. To remotely vent the regulator, remove the vent
(key 56) and install obstruction-free tubing or
piping into the 1/4 NPT vent tapping. Provide
protection on a remote vent by installing a
screened vent cap into the remote end of the
vent pipe.

5. If continuous operation of the system is required
during inspection or maintenance, install a parallel
run with a three-valve bypass around the regulator.

For Types with external pressure registration which
require a downstream control line, be sure to install the
control line before putting the regulator into operation.
The control line pipe should be at least 1/2-inch
(13 mm) in diameter and connected to a straight
section of outlet piping 5 to 10 pipe diameters
downstream of the regulator. If turbulence exists, a
hand valve can be installed in a straight section of the
control line. This hand valve can be throttled down to
dampen out pulsations which may cause instability or
cycling of the regulator. If a block valve is required,

install a full ow valve between the regulator and the

blanketed vessel.

Startup and Adjustment

WARNING

!

To avoid personal injury, property
damage, or equipment damage caused

4