Manual

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INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

IOM-P4

11/13

SECTION I

I. DESCRIPTION AND SCOPE

The Model P4 is a high ﬂ ow single stage pressure reducing regulator used to control downstream (outlet or P

)

pressure. Sizes are 3/8" and 1/2" (DN10 and DN15) FNPT or 1/2" (DN15) with Tri-Clamp connections. The unit is

suitable for gaseous service. Refer to Technical Bulletin P4-TB for design conditions and selection recommendations.

SECTION II

II. INSTALLATION

MODEL P4

BALANCED PRESSURE REDUCING REGULATOR

1. An inlet block valve should always be installed.

2. If service application is continuous such that

shut down is not readily accomplished, it is rec-

ommended that an inlet block valve, outlet block

valve, and a manual bypass valve be installed.

3. Pipe unions should be installed to allow removal

from piping.

4. An outlet pressure gauge should be located ap-

proxi mately ten pipe diameters downstream, and

within sight.

5. All installations should include a downstream re-

lief de vice if the inlet pressure could exceed the

pres sure rating of any downstream equip ment or

the maximum outlet pressure rating of the unit.

6. Clean the pip ing of all foreign material including

chips, welding scale, oil, grease and dirt before

installing the reg u la tor. Strainers are rec om-

mend ed.

CAUTION

Installation of adequate overpressure pro tec tion

is recommended to pro tect the reg u la tor from

over pres sure and all down stream equip ment from

dam age in the event of regulator failure.

7. In plac ing thread seal ant on pipe ends pri or to

en gage ment, ensure that excess material is

re moved and not allowed to enter the regulator

upon startup.

8. Flow Direction: Install so the ﬂ ow direction match-

es the inlet stamp on the main regulator body (1).

9. For best performance, install in well drained hori-

zon tal pipe.

10. Basic Regulator - (Refer to Figure 2): Regula-

tor may be rotated around the pipe axis 360°.

Recommended position is with knob (4) ver ti cal

upwards.

11. Regulators are not to be buried un der ground.

12. For insulated piping systems, recommendation is

to not insulate regulator.

Recommended Piping Schematic

For Pressure Reducing Station

Outlet

SRV

Supply

Bypass

Model P4

Reducing

Regulator

Blowdown-Drain

Summary of content (8 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-P4 11/13 MODEL P4 BALANCED PRESSURE REDUCING REGULATOR SECTION I I. DESCRIPTION AND SCOPE The Model P4 is a high flow single stage pressure reducing regulator used to control downstream (outlet or P2 ) pressure. Sizes are 3/8" and 1/2" (DN10 and DN15) FNPT or 1/2" (DN15) with Tri-Clamp connections. The unit is suitable for gaseous service. Refer to Technical Bulletin P4-TB for design conditions and selection recommendations. SECTION II II.
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SECTION III III. PRINCIPLE OF OPERATION 1. Movement occurs as pressure variations register on the diaphragm (7.1). The registering pressure is the outlet, P2, or downstream pressure. The range spring (15) opposes diaphragm movement. As outlet pressure drops, the range spring pushes the diaphragm down, opening the port; as outlet pressure increases, the diaphragm pushes up and the port opening closes. 2. A complete diaphrag failure will cause the regulator to fail open. SECTION IV IV.
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SECTION VI VI. MAINTENANCE WARNING SYSTEM UNDER PRESSURE. Prior to performing any maintenance, isolate the regulator from the system and relieve all pressure. Failure to do so could result in personal injury. A. General: 1. Maintenance procedures hereinafter are based upon removal of the regulator unit from the pipeline where installed. 2. Owner should refer to owner's procedures for removal, handling, cleaning and disposal of nonreuseable parts, i.e. gaskets, etc. 3.
PAGE 4
of at least mid-range spring level; i.e. 2-100 psig (.14-6.9 Barg) range spring, 51 psig (3.5 Barg) test pressure minimum. C. Trim Replacement: 1. Remove spring chamber (6) and diaphragm subassembly (7) per Section VI, Steps B.1.– B.4. 2. Remove seat retainer (13) by turning CCW. 3. Remove poppet (8) and poppet spring (9). 4. Remove o-ring (11) and back-up ring (17). 5. Clean debris from within the body (1) cavity. Clean all parts to be reused according to owner's procedures.
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SECTION VII VII. TROUBLE SHOOTING GUIDE 1. Erratic operation; chattering. Possible Causes A. Oversized regulator; inadequate rangeability. B. Worn poppet; inadequate guiding. C. Weakened/broken poppet spring. Remedies A1. Check actual flow conditions, re-size regulator for minimum and maximum flow. A2. Increase flow rate. A3. Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice in inlet piping union. A4. Install next step higher range spring. A5.
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SECTION VIII VIII. ORDERING INFORMATION NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped on the metal name plate and attached to the unit. This information can also be found on the Bill of Material ("BOM"), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
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Figure 2: Item No.
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The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such product at any time without notice. Cashco, Inc.