Emerson Y693 Instruction Manual

Instruction Manual
Form 5342

March 2015

Type Y693 Gas Blanketing Regulator

Type Y693

W6200

Introduction

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
manufacturer’s 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

Figure 1. Type Y693 Gas Blanketing Regulator

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 Y693 regulator.

Scope of the Manual

This instruction manual includes installation, startup,
maintenance and parts information for the Type Y693
Gas Blanketing Regulator (Figure 1).

Product Description

The Accu-Pressure™ Type Y693 Gas Blanketing
Regulator (Figure 1) is a pressure reducing
regulator with external registration requiring a
downstream control line. It is used for accurate
pressure control on pressure blanketing systems.
The regulator will help in controlling emissions
from the blanketed product and helps in protecting
against any contamination to the blanketed product
by atmospheric conditions.

www.fisherregulators.com

D102021X012

Type Y693

Specications

The Specications table lists specications for the Type Y693 Gas Blanketing Regulator. Specications for a given

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

Body Sizes and End Connection Styles

NPS 1-1/2 and 2 NPT, ASME CL150 and CL300

RF anged (Optional) or EN PN 16, 25 and 40
RF anged (Optional)

Maximum Allowable Inlet Pressure

150 psig / 10.3 bar or body rating limit

Maximum Outlet (Casing) Pressure

15 psig / 1.0 bar

Outlet Pressure Ranges

(2)

See Table 1

Maximum Operating Outlet Pressure to Avoid
Internal Part Damage

(2)

(1)

Material Temperature Capabilities

Nitrile (NBR): -20 to 180°F / -29 to 82°C
Fluorocarbon (FKM): 40 to 300°F / 4 to 149°C

Polytetrauoroethylene (PTFE):

(2)

0 to 300°F / -18 to 149°C

Spring Case Connection

(2)

Aluminum Version: 3/4 NPT
Steel and Stainless Steel Version: 1/2 NPT

Approximate Weights

Cast Iron with Aluminum: 22 lbs / 10 kg
WCC Steel or CF8M Stainless steel:

57 lbs / 26 kg
WCC Steel with Aluminum 35 lbs / 16 kg

2 psig / 0.14 bar above outlet pressure setting

1. Flanged end connections and end connections for other than U.S. standard can usually be provided; consult the local Sales Ofce.

2. The pressure/temperature limits in this manual, and any applicable standard limitation, should not be exceeded.

Table 1. Outlet (Control) Pressure Ranges

OUTLET PRESSURE RANGE

psig bar In. mm

0.5 to 2.0 in. w.c.

Light diaphragm plate

Heavy diaphragm plate

Heavy diaphragm plate with
brass closing cap and heavy

duty spring adjustor

1. Outlet pressure ranges are for installations with the spring barrel positioned in any direction. After installation always check/adjust the pressure setting.

2 to 5 in. w.c.
5 to 8 in. w.c.

8 to 18 in. w.c.

18 to 32 in. w.c.

1 to 2

1.5 to 3.3
2 to 5

2 to 5.5

4 to 10

69 to 138 mbar

103 to 228 mbar

138 mbar to 0.3 bar

138 mbar to 0.4 bar
276 mbar to 0.7 bar

(1)

1 to 5 mbar

5 to 12 mbar
12 to 20 mbar
20 to 45 mbar
45 to 80 mbar

COLOR

CODE

Brown

Red

Black

Gray

Dark Green

Dark blue

Orange

Yellow

Green stripe

Silver

CONTROL SPRING

WIRE DIAMETER

0.109

0.120

0.130

0.156

0.182

0.225

0.250

0.283

0.363

0.406

2.77

3.05

3.30

3.96

4.62

5.72

6.35

7.19

9.22

10.3

(2)

PART

NUMBER

1D892527022
1D892627022
1D892727012
1D893227032
1D893327032

1H975827032
1H975927032
1P615427142

0Y066427022
1H802427032

The regulator will maintain a positive vessel
pressure reducing the possibility of vessel wall
collapse. The Type Y693 is available in

NPS 1-1/2 and 2 / DN 40 and 50 body sizes.

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 is installed
where service conditions could exceed

the limits given in Specications or

where conditions exceed any ratings
of the adjacent piping or piping
connections. To avoid such injury or

2

damage, provide pressure-relieving
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. A regulator should be inspected
immediately for damage after any
overpressure condition.

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.

Type Y693

Key numbers referenced in this section are shown in
Figures 3, 4 and 5.

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
male pipe threads.

2. The regulator may be installed in any position as

long as the ow through the body is in the direction
indicated by the ow arrow attached to the body.

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. Position
the body (key 28) and/or diaphragm spring case
(key 23) so it will not collect moisture or debris

into the screened vent (as shown in Figure 2). If

the regulator requires repositioning, refer to the
body area maintenance procedures and/or the
diaphragm and spring case area maintenance
procedures in the Maintenance section to

reposition the screened vent for the application.
If a block valve is required, install a full ow valve
between the regulator and the blanketed vessel.

3. Attach a downstream pressure control line to the
female connection in the lower spring case. The
female pressure connection is a 1/2 NPT in the
steel or stainless steel lower spring case and
a 3/4 NPT for the aluminum lower spring case.
Connect the other end of the control line to the

vessel. To allow for self-drainage, install the control

line at an angle so that any liquid material will drain
away from the regulator. See Figures 4 and 5 for
the location of the external control line connection.

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.

TYPE Y693

BLOCK
VALV E

A6342

VENT
VALV E

VENT
VALV E

CONTROL
LINE

BLOCK
VALV E

GAS BLANKETING PRESSURE

VESSEL / TANK

Figure 2. Typical Type Y693 Installation

VENT
VALV E

BLOCK
VALV E

4. For proper regulator operation, a spring case vent

(key 56) is required to allow atmospheric pressure

to register on the diaphragm. The spring case vent

must be kept open and positioned in such a manner

to prevent the spring case from collecting moisture,
corrosive chemicals or other foreign material. To
allow maximum exibility in installing the regulator,
the vent assembly is supplied separately in a
bag. Install the vent assembly in the 3/4 NPT vent
tapping and position the vent pointed down as

shown in Figure 2.

Depending on the orientation of the regulator, the

elbow (key 75) supplied with the vent may not be
required to position the vent pointed down.

5. To remotely vent the regulator, remove the vent

and install obstruction-free tubing or piping into

the 3/4 NPT vent tapping. Provide protection on a
remote vent by installing a screened vent cap into
the remote end of the vent pipe.

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

3

Type Y693

Startup and Adjustment

WARNING

!

To avoid personal injury, property
damage or equipment damage caused
by bursting of pressure containing parts
or explosion of accumulated gas, never
adjust the control spring to produce an
outlet pressure higher than the upper
limit of the outlet pressure range or that
particular spring (see Table 1). If the
desired outlet pressure is not within
the range of the control spring, install
a spring of the proper range according
to the Diaphragm and Spring Case Area
section of the maintenance procedure.

With installation completed, the regulator can be
placed in operation by slowly opening the upstream

and downstream block valves, if used, while using

gauges to monitor pressure. The regulator takes
control when downstream pressure is established.

The regulator has been adjusted at the factory

to provide approximately the reduced pressure

requested. To ensure the correct pressure setting

always use a pressure gauge to verify the outlet

pressure setting. The range of allowable pressure
settings is stamped on the spring casing nameplate.
If a pressure setting beyond the stamped range is
required, install a spring with the desired range by
following the procedures for changing the spring and
diaphragm in the Maintenance section. To adjust the
pressure setting, perform the following steps (key
numbers are referenced in Figures 3, 4 and 5):

1. Remove the closing cap (key 3, if required).

2. Turn the adjusting screw (key 2) either clockwise
to increase outlet pressure or counterclockwise to
decrease outlet pressure. The regulator will go into
immediate operation. To ensure correct operation
always use a pressure gauge to monitor the
blanket pressure when making adjustments.

3. Replace the closing cap (key 3, if required).

blanketing regulator remains open in response to the

decreasing downstream pressure. If vent valves are not

installed, safely bleed off both inlet and outlet pressures,
and check that the regulator contains no pressure.

Principle of Operation

The Type Y693 Gas Blanketing Regulator reduces a

higher-pressure gas to maintain a positive low pressure
of blanket gas over a stored liquid (see Figure 2). 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 (caused by pump out or

atmospheric cooling) 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 reestablished, the regulator throttles closed.

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, outlet pressure tends

to increase slightly, acting on the diaphragm. When the
outlet pressure exceeds the control spring setting, the

diaphragm moves to close the disk assembly.

Maintenance

Regulator parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts

depends upon the severity of service conditions

or the requirements of local, state and federal
regulations. Due to the care Emerson™ takes in
meeting all manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Fisher®.

Shutdown

First, close the nearest upstream shutoff valve and
then, close the nearest downstream shutoff valve and
the block valve on the control line (refer to Figure 2).
Next, open the vent valve between the regulator and
the downstream shutoff valve nearest to it. Then, open
the upstream vent valve and the vent valve in the
control line. All pressure between these shutoff valves
is released through the open vent valves, since a gas

4

WARNING

!

To avoid personal injury, property
damage or equipment damage caused by
sudden release of pressure, isolate the
regulator from all pressure and cautiously
release trapped pressure from the
regulator before attempting disassembly.