gas blanketing doclib 1090 iom3041hl.1

8/6/2019 Gas Blanketing DocLib 1090 IOM3041HL.1

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Installation, Operation and

Maintenance

Model 3041H & 3041L

Blanket Gas Regulators

IOM 3041HL.1MAY 2006


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TABLE OF CONTENTS

Description Page

Introduction 1Design, Function & Operation 1Safety 3Inspection & Installation 3Pressure Setting 4Flow Capacity Setting 4Blanketing the Tank 5Troubleshooting Guide 6Preventive Maintenance 7Recommended Spare Parts 7Disassembly 7 Assembly 8Testing & Setting Procedure 10Model Identification 13Product Limited Warranty 13

Figures

1 Shut-off Condition 12 Flowing Condition 23 Tank Installation 24 Orifice Sleeve 5,95 Spring Bonnet Assembly 76 Piston/Body Assembly 7,97 Exploded Piston Assembly 8,98 Actuator Linkage Assembly 89 Test Set-up 10

10 Cross-Sectional Assembly 12

Tables

1 Specifications 32 Model Selection 4

3 Spring Table 44 Flow Capacity 55 Orifice Selection 56 Soft Goods Kits 77 Bolt Torque 98 Bill of Material 11

INTRODUCTION

The gas blanketing regulator is one of theprincipal components typically installed on astorage tank to protect the tank and itscontents. It is a precision regulator that iscapable of maintaining a set vacuum in thetank by controlling the flow of a high pressure

(200 PSI maximum) blanketing gas. Itmaintains a vacuum when fluid is pumped outor as fluid temperature decreases.

Typically nitrogen or another compatible gasis used to displace the tank product vapors.This reduces product evaporation andexcludes atmospheric contaminants, includingmoisture, from the tank, preventing tankcorrosion and product contamination. The useof an inert blanketing gas minimizes air

pollution due to leakage or emergencyventing.

In addition to the blanketing regulator, a tankmust be protected from structural damage bypressure and vacuum relief valves. A typicaltank installation is shown in Figure 3, which

includes the regulator, a pressure vacuumrelief valve and an emergency pressure relief valve. Groth Corporation manufacturers all ofthese devices.

The regulator must be maintained by aknowledgeable valve technician. It shouldonly be assembled under clean conditions,preferably in a shop environment. Carefullyread and understand this manual beforeattempting to adjust set pressure or flowcapacity, or repair the regulator. GrothCorporation offers repair services for allproducts manufactured by the Groth ProductsGroup.

For information not contained in this manual,please contact:

Groth Corporation13650 N. Promenade

Stafford, TX 77477281-295-6800 (Phone)

281-295-6995 (Fax)

DESIGN, FUNCTION & OPERATION

The Groth Model 3041L & 3041H Regulatorsare high capacity, spring operated, diaphragmtype, balanced piston regulators, designed for

tank blanketing applications.

Figure 1: Model 3041L - Shut-off condition


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The regulator controls the flow of blanketinggas to the vapor space in the storage tank.When the internal vacuum of the tank is at orbelow set vacuum, the spring force exceedsthe diaphragm force and the regulator is shutoff bubble tight. When the tank vacuumexceeds the set point, the diaphragm force

opens the regulator and blanket gas flows intothe tank (See Figures 1 and 2).

Figure 2: Model 3041H - Flowing condition

The regulator must be sized to providesufficient blanket gas to prevent excessivetank vacuum due to liquid discharge ordecreased ambient temperature. Table 3 liststhe maximum flow capacity of the regulator for

various blanketing gases. Actual system flow will depend on supply system piping, tankconnection piping and position of the internalorifice sleeve. Set vacuum is the vacuum atwhich the regulator begins flowing when tank vacuum is increasing and stops flowing whentank pressure is decreasing.

This manual is intended to providerecommended procedures and practices forinstallation, operation, and maintenance of theGroth MODEL 3041L & 3041H Regulators. Anystandard procedures and practices developedfor a specific plant or process shouldsupersede this manual. While this manualcannot cover all possible contingencies,following these guidelines should providesafe, reliable regulator performance.

Note: Throughout this manual, the itemnumbers are listed in [ ] after the partdescription. These item numbers refer to theBill of Materials (Table 8) and variousdrawings of the regulator and its sub-assemblies (Figures 4 through 10). While thesize and appearance of the actuators differsbetween the 3041L and 3041H, the itemidentification and description of thecomponents are identical.

Figure 3: Typical tank installation


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TABLE 1: MODEL 3041 SPECIFICATIONS

Flow coefficient - Cv 12.5

Inlet/Outlet connection size 1

Maximum supply pressure 200 PSI

Max tank pressure/vacuum 8 PSI

GENERAL SAFETY INSTRUCTIONS

This section is intended as an overview ofsafety guidelines that should be followedduring the installation, operation andmaintenance of the Groth model 3041L &model 3041H Gas Blanketing Regulators. Tounderstand the context of these warnings andinstructions, read and understand thiscomplete manual.

The blanket gas regulator is one of theprincipal protection devices typically installedon a product storage tank. It is a precisionregulator that is designed to maintain aspecified vacuum on the tank. This will prevent

product loss or contamination fromatmospheric air when pumping liquid out orwhen the stored fluid cools.

The blanket gas regulator should not be usedas a substitute for a vacuum relief valve. Aninterruption in the blanket gas supply couldcause tank failure.

SAFETY WARNINGS

1. In the event of blanket gas supply failure,the regulator will NOT protect the tank froman excess vacuum condition. The operating

relief valve should include a vacuum

breaker set according to the tank's designvacuum capacity.

2. In the event of an actuator diaphragmfailure, the regulator will fail in the CLOSED position. Gas flow will be shut off. If avacuum condition exists, excess tankvacuum will be prevented by an inflow of airthrough the vacuum relief valve.

3. Gas Blanket Regulator flow capacity is based on a known supply pressure and a properly sized gas distribution system.Consult factory for capacity data if supplyand/or discharge piping do not meet the

criteria specified in the installation section.

4. The regulator is normally factory set at thedesired set pressure and orifice restriction.These settings and the spring range are

stamped on the nameplate. DO NOT attemptto readjust the set pressure beyond the

limits specified in Table 3.

5. The regulator is to be connected to the tankor vessel with a minimum .31" ID tubing

sense line. This line must be kept open andunobstructed to ensure that the regulator

senses" the actual tank pressure. Long sense lines may require a larger diameter andcare must be taken to assure that the line is

self-draining. For some applications, a nitrogen purge may be required to ensure

that this line remains open. Consult factoryfor recommendations.

6. DO NOT attempt to remove the regulatorfrom the line or perform field repairs in linewithout first isolating the regulator from

both the tank and the supply gas line. Bleedall pressure before removing the spring

bonnet or the flow orifice locking screw, oropening up the actuator housings.

7. Note the orifice sleeve position whendisassembling the regulator. It was factory

set according to the flow requirements listedon the order and must be re-installed in the

same position to ensure the correct flow.8. The regulator body and actuator housing

are exposed to process vapors. Observe all safety precaution as specified on theMaterial Safety Data Sheet for the productsthat are in the tank.

1) The vents on the spring bonnet and actuator housing must be clean and open to theatmosphere and should be inspected

periodically.

2) The recommended set pressure range of the regulator spring is stamped on the

nameplate. Never adjust a spring for a set pressure beyond its design range as specified in Table 3. Exceeding the springupper limit may compress the spring to its

solid height, and prevent the regulator fromclosing. Setting it below the lower limit may

prevent the regulator from opening fully atthe required pressure.

INSPECTION AND INSTALLATION

The regulator is packaged and supported toprevent damage or contamination in shipping.It should be similarly protected duringsubsequent handling and storage. Alwayskeep all ports plugged to prevent intrusion offoreign materials. Before installation, inspectthe unit visually. If there are indications ofphysical damage or internal contamination,the regulator must be disassembled, cleanedand inspected before installation. If factory set,the spring adjustment cap and the orificeselector locking screw must be secure. Reportany shipping damage to your carrier.


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If the regulator is stored in an uncontrolled

environment, some condensation may

accumulate in the actuator housing due to

temperature fluctuations. Invert the

regulator and drain all condensation

through the vents.

The regulator inlet and outlet connections are1" NPT (F) or 1" 150# RF ANSI flange. Theregulator must be installed level, the directionof the flow is marked on the body. It is to beinstalled in accordance with accepted pipingpractices. Full bore block valves should beinstalled upstream and downstream of theregulator and in the sense line to allow it to beremoved from the system for maintenance.

Gas Blanket Regulator flow capacity is basedon a known supply pressure at the regulatorinlet port, and choked flow [discharge pipingpressure drop less than half of the supplypressure]. Consult factory for capacity data if

supply and/or discharge piping do not meetthese criteria.

The regulator is to be connected to the tank or vessel with a minimum .31" ID tubing senseline. This line must be kept open andunobstructed to ensure that the regulator"senses" the actual tank pressure vacuum.Long sense lines may require a largerdiameter and care must be taken to assure thatthe line is self-draining. For some applications,a nitrogen purge may be required to ensurethat this line remains open. Consult the factoryfor recommendations for remote installations

or vapors that may cause line obstructions.

All supply piping must be free of weld slagand other debris before installing theregulator.

PRESSURE SETTING

Model selection is based on a combination ofset vacuum and supply pressure as shown intable 2.

Supply Pressure [PSI]Table 2

Set vacuumIn WC

5- 50 51-100

101-150

151-200

0.5-0.9

1.0-1.43041L

1.5-1.9 3041H

2.0-8.0

The regulator may be set at the factory or onthe tank or vessel when initially introducingblanketing gas. A gauge (or manometer) isrequired to indicate the tank vacuum.

WARNING

When adjusting the regulator on the tank, always be

sure that the sense line is open and unobstructed.

Monitor the tank vacuum accurately.

Set vacuum is adjusted by removing the valvecap [3] and rotating the adjusting screw [35].Back off the jam nut [28] and turn the screwclockwise (tighten) to increase set vacuum.The model 3041L & 3041H regulators cover arange of set vacuum from 0.5" WC to 8.0 WC.Table 3 shows standard set vacuum ranges.

The set vacuum range with the original springis stamped on the valve nameplate. Theregulator will not function properly if thesetting is outside this range. If higher or lowersettings are required, the necessarycomponents can be obtained from GrothCorporation. They must be installed accordingto instructions in the maintenance section of

this manual.

Table 3

Model 3041L

Setting [In WC]SpringRange

MaxSupply

PSIMin Max

Model 3041H

Setting [In WC]SpringRange

MaxSupply

PSIMin Max

1 50 0.5 0.9

2 100 1.0 1.4

3 150 1.5 1.9

4 200 2 3.5

5 200 3.6 6.5

6 200 6.6 8.0

FLOW CAPACITY SETTING

Table 4 shows flow capacity for a regulator setat 100% full open. Unless otherwise specified,the orifice selector sleeve [12] is factory set atthe 100% full open position.

TABLE 4: FLOW CAPACITY [SCFH]*


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SupplyPressure

PSI

CarbonDioxide

Nitrogen NaturalGas

0.6 SG

5

10

15

20

30

40

50

60

80

100

120

140

160

180

200

4600

7100

9200

11200

15100

18800

22500

26000

33000

40000

47000

53900

60900

67900

74900

5800

8800

11500

14000

18900

23600

28200

32600

41300

50100

58800

67500

76300

85000

93700

7400

11300

14600

17900

24000

30000

35800

41500

52600

63700

74800

85900

97000

108100

119200

* Orifice sleeve installed in 100% flow capacity position.

If reduced capacity is specified on an order,the sleeve is set at the appropriate restriction. Actual capacity at any other position can becalculated by multiplying the capacity valuefrom Table 4 for a specific pressure by thedecimal fraction from Table 5.

TABLE 5: Orifice Selection

Orifice sleeve position

1 2 3 4 5 6 7 8

1.0 .75 .50 .25 .20 .15 .10 .05

Flow capacity multiplier

WARNING

The adjustable orifice is located in a pressure-containing chamber. Close the supply valve and

release all pressure before making adjustments.

Flow capacity can be adjusted by rotating theorifice sleeve (See Warning). It has a series ofindexing holes, eight of which are marked

with the numbers 1 through 8 (See Figure 4).One unmarked hole is used to assist when

rotating the sleeve. With the regulator

blocked and vented, adjustment can be madeby backing the lockdown screw completelyout of the body. The sleeve position can thenbe viewed and the sleeve rotated by insertinga small diameter probe into the holes.

Figure 4: Orifice Sleeve Orientation

When replacing the locking screw, grease theO-ring [42] and slip it over the screw threads.Thread the screw [13] into the body, finger

tight, until the point enters the sleeve and thehead seats onto the O-ring. Then wrenchtighten the head firmly against the body,compressing the O-ring.

Regulator flow capacity and sleeve positionare shown in Tables 4 and 5. These tables arebased on the supply pressure at the regulatorinlet and piping as recommended in theinstallation section.

WARNING

The regulator orifice sleeve is factory set at the specified flow capacity. When repairing a

regulator, note the position of the indexing holesat disassembly. The sleeve must be re-assembled in the same position to ensure the

proper flow capacity. NEVER adjust the orifice sleeve position without written instructions fromyour plant operations group.

BLANKETING THE TANK

Before installing a new or replacementregulator, the tank vacuum should be greaterthan the desired set vacuum so the regulatorsetting can be verified. Sequentially open theblock valves in the following order: (1) Sense

Line, (2) Regulator Discharge Line and (3)Regulator Supply (See Figure. 3).

If the regulator was set at the factory, blanketgas will begin to flow immediately. The tankpressure must be monitored closely to verifythat the gas flow shuts off at the set pressure.

If the regulator was not set at the factory, makesure that the adjusting screw [11] is screwed inas far as possible (maximum springcompression). When the blanket gas supply


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valve is turned on, there will be no flow, unlessthe tank pressure is very low. Now slowly turnthe adjusting screw to decrease tank vacuumand the gas will begin to flow. The tank vacuum can be decreased as gradually asdesired until the correct vacuum setting isattained. When tank vacuum is reached,

screw in adjusting screw, if necessary, untilgas flow stops.

WARNING

In the event of blanket gas supply failure, the regulator will NOT protect the tank from anexcess vacuum condition. The operating reliefvalve should include a vacuum breaker set

according to the tank's design vacuum capacity. In the event of an actuator diaphragm failure,the regulator will fail in the CLOSED position.Gas flow will be shut off. If a vacuum conditionexists, excess tank vacuum will be prevented byan inflow of air through the vacuum relief valve.

TROUBLESHOOTING GUIDE

PROBLEM INSPECTION SUGGESTED CORRECTIVE ACTION

Gas flowing at tank

vacuum belowspecified set point.

Flow indicator in

blanket gas line.

Damaged seat, o-ring or diaphragm or vacuum

setting too low. If original vacuum setting has notbeen disturbed, remove regulator and repair.

Gas not flowing attank vacuum abovespecified set point.

Flow indicator inblanket gas line.

Damaged spring or vacuum setting too high. Iforiginal vacuum setting has not been disturbed,remove regulator and repair.

Gas leaking frombonnet vent or flange.

Soap bubble testand joining surfaceor emissionindication near theregulator.

Damaged lower piston diaphragm. Removeregulator from tank and replace diaphragm.Diaphragm installed incorrectly. Reinforcementfabric must be opposite to vacuum (see page 9).

Blanket gas leakingfrom lower body seal.

Soap bubble test atjoining surface or

emission indicationnear the regulator.

Damaged upper piston diaphragm. Removeregulator from tank and replace diaphragm.

Diaphragm installed incorrectly. Reinforcementfabric must be opposite to vacuum (see page 9).

Process vapor leakingfrom actuator housingflange or vent.

Soap bubble test atjoining surface oremission indicationnear the regulator.

Damaged actuator diaphragm or loose housingbolts. Tighten bolts or remove regulator from tankand replace diaphragm.

Tank vacuum aboveor below specifiedoperating rangeduring pump out orpump in.

Observe tankvacuum indicatorduring pumpingoperations.

Excess or insufficient blanket gas flow. Check floworifice orientation. Refer to Tables 2 & 3 for flowcapacity data. Check gas supply pressure.Remove and repair regulator if other conditionsare correct.

Tank pressure or

vacuum exceeds ventsettings during pumpout or pump in.

Observe tank

pressure indicatorduring pumpingoperations.

Pressure/vacuum relief vent not functioning or not

sized properly. Inspect and repair or replace asnecessary.

PREVENTIVE MAINTENANCE

Periodically, while in service, examine theregulator for leakage at bolted connections,

adjusting screws, etc. Test for blanket gas orprocess vapor emissions from vent caps.

RECOMMENDED SPARE PARTS


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The following spare parts should be stockedfor maintenance purposes:

Spring [35]; See Table 2 for the correctpart number.

Vent [26]; part number 10064003

Soft Goods Kit; See table 6 for the correctpart number.

When ordering spare parts, include modeland serial number of regulator, pressuresetting, and required material for soft goods.

Table 5: Soft Goods Kits

Elastomer 3041L 3041H

Buna-N KS3041LB KS3041HB

Chemrez KS3041LC KS3041HC

EPDM KS3041LE KS3041HE

Viton KS3041LV KS3041HV

DISASSEMBLY

WARNING

Before removing the regulator from the tank for service, block and vent supply, discharge and sense lines. Never attempt to remove theregulator from the line, or to remove the spring bonnet or orifice sleeve locking screw if theregulator is pressurized.

All service on the regulator may be performedwith the following common tools:

A. 7/16" 9/16" box end wrenches

B. 3/8" open end wrench*C. 1/2 socket wrenchD. Adjustable wrench

*Wrench must be 12" long for flanged units.

Invert the regulator and support it on theactuator housing. Block or clamp the housingto the bench as required to facilitate removalof the spring bonnet.

Remove the adjustment screw cap [3] andloosen the jam nut [28]. Turn the adjustmentscrew [11] counterclockwise to completelyrelax the spring [35]. Remove the cap screws

Figure 5: Spring Bonnet Assembly

[29] and lock washers [30]. Remove the springbonnet [2]. Remove the upper spring button[10], the spring [35], the lower spring button[10] and then the bonnet adapter ring [9].

WARNINGDiaphragm actuator housing and regulator bodyare exposed to the process vapor(s). Observeall standard safety precautions as specified on

Material Safety Data Sheets for the product(s)that are in the tank. These precautions apply

both during removal of the regulator from thetank and while repairing it.

Use a 3/8" open-end wrench and insert it

through the inlet port to hold the piston [6] atthe wrench flats. Remove hex bolt [31] whileholding onto the piston. Be careful not to let

Figure 6: Piston/Body Assembly


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the piston rotate during removal of the hexbolt. The piston diaphragms [37] can be torn ifcare is not taken. Remove the upperdiaphragm retainer [8] and the upper pistondiaphragm [37].

Invert the body/actuator assembly and clampthe body [10] in the vise.

Remove the hex nuts, lock washers, and hexbolts [32, 33 & 34]. Remove the upper actuatorhousing [5], the gasket [36] and the diaphragm[43].

Insert a 1/2" socket wrench through the holesin the diaphragm support plate [15] andremove the (2) hex bolts [29] and lock washers[30] that retain the actuator linkage assembly.Remove the linkage assembly and set it aside.Remove the other (2) hex bolts and theactuator housing [4].

Remove the guide ring [14], the O-ring [41]and the piston assembly from the body.

Remove the hex bolt [31], retainer [8] andpiston diaphragm [37] from the piston.Remove the stop ring [40] the retaining ring[39], the retainer [7] and the O-ring [38]. Usecare to prevent permanently expanding themetal rings or scratching the surface of thepiston.

Figure 7: Exploded Piston Assembly

Refer to "FLOW CAPACITY SETTING" andwarnings before removing the orifice selectorsleeve [12] from the body. Back the lockingscrew [13] completely out of the Body. Beforeremoving the orifice selector sleeve, makenote of its position by looking through thescrew port. There will be a number stenciledon the sleeve indicating the position of thesleeve. Note this number for re-assembly.Refer to Tables 4 & 5 to determine flow

capacity of the regulator at a specific orificesleeve position.

Figure 8: Actuator Linkage Assembly

Clean and inspect the sleeve, body cavity andseat. Polish or lap the seat if required to obtaina sharp but smooth seating edge for the O-ring.

All components should be examined fordamage or wear. Replace all diaphragms, O-rings and gaskets. Prior to reassembly, makesure all components are clean.

Inspect the actuator linkage assembly. Theassembly is riveted and should not bedisassembled. All components should bestraight and flat. All rollers and pins must befree to rotate and slide as the support platemoves vertically.

ASSEMBLY

Before assembly note the following materialand tool recommendations:

1. Diaphragms, O-rings, gasket, vents andspring as listed in Table 6.

2. Lubricants & Thread SealantsA. Silicone Grease Dow Corning No. 33B. Anti-Galling Lubricant Dow Corning

G-N Metal Assembly SprayC. Teflon tape

3. Assembly ToolsA. 7/16" 9/16" box end wrenchesB. 3/8" open end wrench*C. 1/2 socket wrenchD. Adjustable wrench

TABLE 6


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RECOMMENDED BOLT TORQUE [FT. - LB.]

Bolt Size 1/4 5/16 3/8 7/16 1/2

Torque 6 11 20 32 44

All screw threads and static O-rings should belightly greased with silicone grease. Lubricate

the piston OD at both ends and the springadjusting screw with an anti-galling spray. Ifthe greases listed above are not compatiblewith the tank vapors, use equivalent lubricantsfor that media. All pipe threads are to be wrapped with Teflon tape or suitable pipethread sealant applied sparingly.

Before installing the orifice selector sleeve,read the section entitled "FLOW CAPACITYSETTING" and related warnings on page 4.Install the orifice selector sleeve [12] into theregulator body. Observe the sleeve positionlocking hole by looking in the locking screwhole in the body. The hole in the sleeveshould be exactly centered in the screw hole.If the holes do not line up exactly, invert thesleeve and reinstall. The position indicatingnumbers will also be seen through the screwhole.

These numbers indicate % open and flowcapacity according to Tables 4 and 5. Makesure that the sleeve position is on the samenumber as when disassembled, or on thenumber that provides the specified flowrequirements.

Grease the locking screw O-ring [42] and slipit over the screw threads. Thread the locking

Figure 4: Orifice Sleeve Orientation

screw [13] into the body, finger tight, until thepoint enters the sleeve and the head seats ontothe O-ring. Then wrench tighten the headfirmly against the body, compressing the O-ring.

Figure 7: Exploded Piston Assembly

Note: Damage to the sleeve will occur if

force is applied with the point of the lockingscrew.

Assemble the piston sub-assembly accordingto Figure 7. Install the o-ring [38] from the topend of the piston. Do not roll the o-ring, butstretch it just enough to clear the pistondiameter. When installing the retaining ring[7], snap ring [39] and lift stop ring [40]expand the rings just enough to clear thepiston without scratching the piston orpermanently deforming the rings.

Figure 6: Piston/Body Assembly

Slide the piston guide ring [14] over the lowerend of the piston and let it rest on the stopring. Attach the piston diaphragm [37] to thepiston [6] with the retainer [81] and hex bolt[31]. Note that retainers [8] and [81] havedifferent thickness. The thinner one [81] contacts


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the actuator linkage. Make sure that the

diaphragm reinforcing fabric is facing away

from the piston. This is essential to developthe pressure rating of the diaphragm.

Secure the body in a vise with the bottomsurface facing upward and the inlet portaccessible (See Figure 6). Spray the piston

sub-assembly with an anti-galling lubricantand insert it and the guide ring into the body.Install the body o-ring [41].

Inspect and clean all diaphragm, gasket andseating surfaces before assembling theactuator housing. Position the lower housing[4] on the body and secure with (2) hex bolts[29] & lock washers [30]. Then position theactuator linkage assembly into the housingand secure with the other (2) bolts.

Position the diaphragm [43], the gasket [36]and the upper housing [5] and insert hex bolts[32] hex nuts [33] and lock washers [34].Tighten uniformly in an alternating pattern;refer to Table 7 for recommended torque.

WARNING

Replace bonnet vent or actuator housing vent [26] if damaged or restricted. A pluggedhousing vent could prevent the regulator fromclosing. This could cause an over-pressurecondition in the tank. A plugged bonnet ventcould prevent the release of supply pressure

from the bonnet. This could cause personalinjury when disassembling.

Invert the assembly in the vise. Install theupper piston diaphragm [37], retainer [8] andhex bolt [31]. Hold piston with 3/8" wrenchthrough outlet port while tightening bolt.Install the bonnet adapter ring [9], spring [35],spring buttons [10] and spring bonnet [2].Attach bonnet to body with hex bolts [29] andlock washers [30]. Tighten bolts uniformly;refer to Table 7 for recommended torque.

Thread set pressure adjusting screw [11] intobonnet until it engages the upper springbutton. Replace lock nut [28] and cap [3].

TESTING AND SETTING PROCEDURE

1.0) Equipment

1.1) A high pressure air ( or inert gas) supplysystem capable of maintaining aregulated supply pressure of 0-200 PSI

1.2) A vacuum source capable of maintainingsense vacuum at 1/2" WC to 1 PSI. Thismay be a vacuum pump or vacuum vessel with a needle valve for flowcontrol.

1.3) A means of indicating or measuring airflow with a capacity of approximately 30SCFH.

1.4) A means of soap bubble shell testing theassembly.

Figure 9: Test Set-up

2.0) Test procedure and Acceptance

Criteria.

2.1) Connect the high pressure air supply tothe regulator inlet port.

2.2) Connect the vacuum source to theregulator sense port.

2.3) Connect a reduced size manual shut-off

valve to the outlet port.2.4) Connect a small diameter hose or plastic

tube to the inlet of the flow indicator orflow meter. Use a hand held port coverto attach the flow meter to the regulatoroutlet port. Never connect the flow meterrigidly to the regulator unless the flowmeter is rated for full air supplypressure.


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2.5) Connect a small diameter hose or plastictube to the outlet of the flow indicatingdevice so the end may be immersed in acontainer of water.

2.6) Close the outlet valve and set the supplyair pressure to the maximum available,but not greater than 300 PSI. Soap

bubble test the entire assembly at thispressure. Open the outlet valve andreduce the supply until a minimumaudible flow is observed.

2.7) Adjust the sense vacuum to the specifiedregulator set vacuum. Adjust theregulator screw to shut off (no audibleflow).

2.8) Increase the supply pressure to thespecified system pressure (100 PSI if notspecified).

2.9) Slowly increase the sense vacuum and

adjust the regulator screw until the airflow is 5-15 SCFH at the specified setting.Lock the adjusting screw at this setting.

2.10) While immersing the outlet tube in water, decrease the sense vacuum untilthe regulator is bubble tight. If this vacuum exceeds the greater of 15% or0.5" WC less than set vacuum, examinethe seat and O-ring. Do not adjust theregulator screw to improve bubbletightness.

2.11) Remove the bonnet vent. Shut off thesupply pressure. Slowly increase the

sense vacuum, while observing thestroke of the piston through the bonnet vent port. The stroke must be 0.18"minimum. Replace the bonnet vent.

2.12) Apply 8 PSI pressure to the sense port.Soap bubble test the actuator housingand body interfaces.

3.0) Test report data.

3.1) The following data should be recordedfor future reference:

Model, Tag & Serial numbers

Test media Body & Actuator shell test pressure

Supply pressure

Set vacuum

Bubble tight vacuum

Table 7: Bill of Materials

Item Name Matl

1 Body 316 SS

2 Bonnet, Spring 316 SS

3 Cap, Adjustment Screw 316 SS

4 Housing, Upper actuator 316 SS

5 Housing, Lower actuator 316 SS6 Piston 316 SS

7 Retainer, O-ring piston seat 316 SS

8 Retainer, Diaphragm 316 SS

81 Retainer, Diaphragm 316 SS

9 Adapter, Bonnet 316 SS

10 Button , Spring 316 SS

11 Screw, Pressure Adjustment SS

12 Sleeve, Orifice selector 316 SS

13 Screw, Sleeve locking 316 SS

14 Ring, Piston guide 316 SS

15 Plate, Diaphragm support 316 SS

16 Bracket, Actuator linkage 316 SS

17 Arm, Actuator linkage 316 SS

18 Arm, Actuator linkage 316 SS

19 Bracket, Actuator linkage 316 SS

20 Roller, Actuator Nylon

21 Roll, Actuator Nylon

22 Spacer, Roll pin Tygon

23 Rivet, pop 316 SS

24 Pin, Actuator linkage 316 SS

25 Nameplate 316 SS

26 Vent Alum

27 Vent connector PVC28 Nut, Hex 316 SS

29 Bolt, hex 316 SS

30 Washer, lock 316 SS

301 Washer, flat 316 SS

31 Bolt, hex 316 SS

32 Bolt, hex 316 SS

33 Washer, lock 316 SS

34 Nut, hex 316 SS

35 Spring 316 SS

36 Gasket, actuator Teflon

37 Diaphragm, Piston Viton38 O-ring, Piston seat Viton

39 Ring, retaining SS

40 Stop, lift SS

41 O-ring, Guide ring Viton

42 O-ring, Locking screw Viton

43 Diaphragm, Actuator Teflon

44 O-ring Viton


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Figure 10: Cross sectional Assembly


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The nameplate on the Groth Model 3041L and 3041H Tank Blanketing Regulator contains the modelnumber, serial number, set vacuum & range and supply pressure. The model number containsadditional information about material of construction, capacity and options. The following chart willassist in relating the model number to the specifications of your regulator:

ModelNumber

__ InletOutlet

__ Material _ SoftGoods

__ OrificeSelection

_ SpringRange

_ Options

N=1 NPT[F] F=1150# Flg

Z=Special

O=NoneZ=Special

B=Buna-NC=Chemrez

E=EPDMV=Viton

Selectfrom

SpringRangeTable

3041L

3041H5=316 SS

1=100%2=75%3=50%4=25%5=20%6=15%7=10%

8=5%

A "Z" in the model number indicates a non-standard material or feature. Review your purchasespecifications or consult Groth Corporation for more details.

EXAMPLE: 3041H-N-5-V-1-2-O Indicates a 3041H Series Regulator with 1" NPT BodyConnections, 316 SS Construction, Viton Elastomers, FullCapacity Orifice, Set vacuum Range from 1.0" WC to 1.5 WCand No Special Requirements.

PRODUCT LIMITED WARRANTY

A. Seller warrants that products which are manufactured by

Seller, are manufactured in accordance with publishedspecifications and free from defects in materials and/or

workmanship for a period of (12) twelve months. Seller, at its

option, will repair or replace any products returned intact to

the factory, transportation charges prepaid, which Seller, upon

inspection, shall determine to be defective in material and/or

workmanship. The foregoing shall constitute the sole remedy

for any breach of Seller's warranty.

B. THERE ARE NO UNDERSTANDINGS, AGREEMENTS,

REPRESENTATIONS, OR WARRANTIES, EXPRESS OR

IMPLIED, (INCLUDING MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE REGARDING

PRODUCTS) UNLESS SPECIFIED IN THE SALES

CONTRACT. THIS CONTRACT STATES THE ENTIRE

OBLIGATION OF SELLER.

Seller makes no warranties, either express or implied, except

as provided herein, including without limitation thereof,

warranties as to marketability, merchantability, for a particular

purpose or use, or against infringement of any patent of products. In no event shall Seller be liable for any direct,

incidental or consequential damages of any nature, or losses or

expenses resulting from any defective new product or the use

of any such product, including any damages for loss of time,

inconvenience, or loss of use of any such product.

C. The original Manufacturer shall be solely responsible for the

design, development, supply, production, and performance of

its products hereunder, and the protection of its trade name or

names, if any. It assumes no responsibility, for products

modified or changed in any way by its agent or customer. Any

such modifications or changes to products sold by Seller

hereunder shall make the product limited warranty null and

void.

D. The Manufacturer shall be under no obligation to manufacture,

sell, or supply, or to continue to manufacture, sell or supply

any of the Products.

gas blanketing doclib 1090 iom3041hl.1

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