Owner manual

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IOM-31-N

05-14

MODEL 31-N

Pressure Reducing Service Regulator

SECTION I

II. INSTALLATION

1. An inlet block valve should always be installed.

An outlet block valve is recommended.

2. If service application is continuous such that

shut down is not readily accomplished, it is

rec om mend ed that an outlet block valve and a

manual bypass valve be installed.

3. Pipe unions are recommended to be installed to

allow removal from piping. Trim can be changed

without removal from pipeline.

4. An outlet pressure gauge should be located

ap prox i mate ly 10 pipe diameters downstream,

and within sight.

5. All installations should include a downstream

re lief device if the inlet pressure could exceed the

pressure rating of any downstream equipment.

A downstream safety relief valve or a rupture

disc is absolutely required if the inlet P

pres sure exceeds 100 psig (6.9 Barg) under

any normal or upset conditions.

SECTION II

I. DESCRIPTION AND SCOPE

The Model 31-N is a pressure reducing service regulator used to control downstream (outlet or P

) pressure to levels

between 2" – 16 “WC (50–400 mm H

O). Sizes are 1/2" 3/4”, 1", 1-1/2" and 2" (DN15, 20, 25, 40 and 50).

The unit is designed for gaseous service only.

Refer to Technical Bulletin 31-N-TB for sizing, application and selection recommendations.

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

WARNING

1. Model 31-N does not include an internal relief mech a nism. Overpressure protection requires use of a downstream

safety relief valve or rupture disc.

2. User to determine acceptance of non-relieving design by federal, state, and/or local codes.

3. IF GAS IS DETECTED BY SMELL, CONTACT YOUR GAS COMPANY IMMEDIATELY.

User to comply with instructions, operating re quire ments and maintenance requirements located herein the “IOM-31-N”.

WARNING

The maximum outlet pressure listed on the name plate is

the “upper operative limit” for the sensing di a phragm.

Higher pressures could damage the internals. (Field hy-

dro stat ic or pneumatic pressure tests fre quent ly destroy

diaphragms. DO NOT HY DRO STAT IC OR PNEUMATIC

PRESSURE TEST THRU AN IN STALLED UNIT EX POS ING

THE OUTLET POR TION OF THE REGULATOR TO PRES-

SURES GREATER THAN 50 PSIG (3.45 BARG) FAIL URE

TO HEED MAY RESULT IN CAT A STROPH IC FAIL URE WITH

FLYING PARTS AND POSSIBILITY OF PER SON AL INJURY!

ISO LATE FROM TEST.)

CAUTION

Installation of adequate overpressure pro tec tion is recom-

mended to pro tect the reg u la tor from overpressure and

all down stream equip ment from damage in the event of

regulator failure.

CAUTION

For welded installations, all internal trim parts, seals and

diaphragm(s) must be removed from reg u la tor body prior to

welding into pipeline. The heat of fusion welding will dam-

age non-metallic parts if not re moved. NOTE: This does

not apply to units equipped with extended pipe nip ples.

Summary of content (12 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-31-N 05-14 MODEL 31-N Pressure Reducing Service Regulator SECTION I I. DESCRIPTION AND SCOPE The Model 31-N is a pressure reducing service regulator used to control downstream (outlet or P2) pressure to levels between 2" – 16 “WC (50–400 mm H2O). Sizes are 1/2" 3/4”, 1", 1-1/2" and 2" (DN15, 20, 25, 40 and 50). The unit is designed for gaseous service only. Refer to Technical Bulletin 31-N-TB for sizing, application and selection recommendations.
PAGE 2
6. Clean the piping of all foreign material including chips, welding scale, oil, grease and dirt before installing the regulator. Strainers are recommended. 8. Flow Direction: Install so the flow direction matches the arrow cast on the regulator body. 9. Refer to Figure 2. Regulator may be rotated around the pipe axis 360°, and may be installed in a horizontal or vertical pipeline. Four orientation/ arrangement assembly positions are standard.
PAGE 3
. Model 31-N includes a linkage lever in its mechanism. The linkage lever allows the regulator to operate flow-to-open (FTO) and provides plug travel multiplication thru the lever length ratio. 5. Aspiration (jet) effect is developed by properly locating the “windows” of the loading ring. When properly positioned, a high velocity path is introduced.
PAGE 4
SECTION VI VI. MAINTENANCE B. Diaphragm Replacement: A. General: WARNING WARNING SYSTEM UNDER PRESSURE. Prior to performing any maintenance, isolate the regulator from the system and relieve all pressure. (Including the External Sensing line when specified.) Failure to do so could result in personal injury. 1. Maintenance procedures hereinafter are based upon removal of the regulator from the pipeline where installed. 2.
PAGE 5
10. While holding upper diaphragm plate (13) by palm of hand, hand-pull diaphragm (12) away from upper diaphragm plate (13). NOTE: The diaphragm (12) is adhered to the upper diaphragm plate (13) with adhesive. Rotate and repeat until the diaphragm (12) is fully removed. Discard used diaphragm (12). Remove remaining adhesive from upper diaphragm plate (13). 11. Examine upper plate (13) for bending or distortion. Replace if deformation is present. 12.
PAGE 6
21. In an alternating cross-pattern, tighten screws (9) in one revolution increments. Repeat pattern until torque reaches 25–30 in-# (2.8–3.4 N-M). 22. Engage adjustment screw (18) the same number of revolutions as recorded from Step 2 previous. 23. Remove and replace closing cap gasket (6). Replace closing cap (5) and finger tighten only. remove. When replacing orifice (26) use pipe sealant PLS-2 or PST Loctite. Rotate CW to tighten orifice (26); tighten to 35–40 ft-# (47.4–54.2 N-M).
PAGE 7
6. Insert linkage pivot pin (23) thru hole in linkage lever (21). Simultaneously engage the linkage lever (21) and the stem (24), and place pin (23) ends back into the “cradles” of the pedestal supports of the lower casing (3), replace washer (37), engage and tighten both machine screws (22). 7. Reinstall diaphragm sub-assembly (DSA) and spring chamber (4) as described in Section VI.B., Steps 16 thru 23. BODY SIZES 1/2', 3/4" & 1" (DN15, 20 & 25) 8.
PAGE 8
SECTION VII VII. SETPOINT ADJUSTMENT/CALIBRATION 4. Reinstall closing cap (6) using pipe joint lubricant/ sealant on threads; finger tighten only. 1. Establish flow thru the regulator, preferably a relatively low flow rate, approximately 50 SCFH. 5. Increase flow rate to near maximum. Check for adequate P2. Repeat Steps 2 thru 4. as required. NOTE: At higher flow rates, removal of the closing cap (6) can induce an instability.
PAGE 9
2. External leakage. Possible Cause Remedy A. Diaphragm failure. A. Replace diaphragm. B. Downstream over-pressurization. B1. Correct process conditions/controls that cause P2pressure to become greater than 50 psig (3.45 Barg). Install safety relief valve or rupture disc with a 50 psig (3.45 Barg) setting or lower. Disassemble actuator assembly and check for bent upper diaphragm plate. Check for relief cap distortion. Flow is tightly shutoff downstream of regulator; relocate shutoff valve.
PAGE 10
SECTION IX IX. 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).
PAGE 11
Body Assembly (BA) Actuator Assembly (AA) Item No. 1 3 4 5 6 Figure 5 1/2", 3/4" & 1' Body Sizes Pedestal Internal Sensing Option * Diaphragm Sub-Assembly (DSA) is made up of Item Nos. 12, 13, 14, 15, 16 & 19. Description Body Lower Case Spring Chamber Closing Cap Gasket (Closing Cap) 8 Gasket (Body) 9 Machine Screw 10 Nut, Hex.
PAGE 12
Cashco, Inc. P.O. Box 6 Ellsworth, KS 67439-0006 PH (785) 472-4461 Fax. # (785) 472-3539 www.cashco.com email: sales@cashco.com Printed in U.S.A. IOM-31-N Cashco GmbH Handwerkerstrasse 15 15366 Hoppegarten, Germany PH +49 3342 4243135 Fax. No. +49 3342 4243136 www.cashco.com email: germany@cashco.com Cashco do Brasil, Ltda. Al.Venus, 340 Indaiatuba - Sao Paulo, Brazil PH +55 11 99677 7177 Fax. No. www.cashco.com email: brazil@cashco.