1900 Series - Maintenance Manual

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VII. Recommended Installation Practices (Contd.)P.D.StopValveP.D.P.D.Vessel Vessel VesselFigure 11: Pressure Drop on the Inlet PipingThe pressuredrop (P.D.)between thesource ofpressure in theprotectedequipment andthe pressure reliefvalve inlet is notto exceed 3% ofthe valve setpressure.P.D.From Protected Equipmentfailure. These vibrations may cause the disc seat to slideback and forth across the nozzle seat and may resultin damage to the seating surfaces. Also, vibration maycause separation of the seating surfaces and prematurewear to valve parts. High-frequency vibrations aremore detrimental to SRV tightness than low-frequencyvibrations. This effect can be minimized by providing alarger difference between the operating pressure of thesystem and the set pressure of the valve, particularlyunder high frequency conditions.Temperature changes in the discharge piping may becaused by flui flowin from the discharge of the valve orby prolonged exposure to the sun or heat radiated fromnearby equipment. A change in the discharge pipingtemperature will cause a change in the length of thepiping, which may cause stresses to be transmitted tothe SRV and its inlet piping. Proper support, anchoringor provision for flexibilit of the discharge piping canprevent stresses caused by thermal changes. Do notuse fixe supports.Outlet PipingAlignment of the internal parts of the SRV is importantto ensure proper operation (see Figure 12). Althoughthe valve body will withstand a considerable mechanicalload, unsupported discharge piping consisting of morethan a companion flange long-radius elbow, and a shortvertical pipe is not recommended. Use spring supportsto connect outlet piping to prevent thermal expansionfrom creating strains on the valve. The discharge pipingshould be designed to allow for vessel expansion aswell as expansion of the discharge pipe itself. This isparticularly important on long distance lines.A continual oscillation of the discharge piping (windloads) may induce stress distortion in the valve body.The resultant movement of the valve’s internal parts maycause leakage.Where possible, use properly supported drainage pipingto prevent the collection of water or corrosive liquid inthe valve body.When two or more valves are piped to discharge intoa common header, the built-up backpressure resultingfrom the opening of one (or more) valve(s) may causea superimposed backpressure in the remaining valves.Under these conditions, the use of bellows valves isrecommended. The use of bellows valves may alsopermit the use of a smaller-size manifold.In every case, the nominal discharge pipe size shouldbe at least as large as the nominal size of the SRV outletflange In the case of long discharge piping, the nominaldischarge pipe size must sometimes be much larger.ATTENTION!!All non-bellows valves should have a bonnet pluginstalled. Bellows valves must have an open bonnetvent.16 | Dresser Consolidated ®
VIII. Disassembly InstructionsCap may requiredfor weatherprotectionFor a closed system, alwayskeep piping strains isolatedfrom the pressure reliefvalve, regardless of processoperation and temperature.Attach Stacky rigidly to structure.Do not connect to drain pan or thediscarge pipingStackDrainPanWRONGWear necessaryprotective equipment toprevent possible injuryLong-RadiusElbowGeneral InformationPan DrainLong-RadiusElbowVessel Vessel VesselFigure 12: SRV Parts AlignmentConsolidated ® SRVs can be easily disassembledfor inspection, the reconditioning of seats or thereplacement of internal parts. Appropriate setpressure can be established after reassembly. (SeeFigures 1 through 10 for parts nomenclature.)ATTENTION!!Before disassembling thevalve, ensure there is no mediapressure in the vessel.Valve caps and bonnetscan trap fluids. Usecaution when removingto prevent injury orenvironmental damage.Do not interchange parts from one valve withparts from another valve.SRV Disassembly1. If equipped, remove the lifting lever gear as follows:• Plain Lever (see Figure 40) Remove cotter pin, lever pin and plain lever[one-piece design] or top lever [two-piecedesign].• Packed Lever (see Figures 41 and 42) Disassembly not required. Rotate leverMany pressure vesselsprotected by Consolidated®Safety Relief Valves containdangerous materials.Decontaminate and cleanthe valve inlet, outlet, andall external surfaces inaccordance with the cleaningand decontaminatingrecommendations in theappropriate Material SafetyData Sheet.counterclockwise, positioning lifting fork so that it clears release nut duringcap removal.2. Remove the cap.3. Remove the cap gasket (27), if applicable.4. Remove adjusting ring pin (4) and adjusting ring pin gasket (5).5. If the existing blowdown is to be restored upon reassembly, determine theposition of the adjusting ring (3) with respect to the disc holder (8) as follows:• Turn the adjusting ring counterclockwise (move notches on the adjusting ringfrom left to right).• Record the number of notches that pass the ring pinhole before the ringcontacts the disc holder.<strong>1900</strong> <strong>Series</strong> Safety Valve (July/2010) | 17
Page 4 and 5: Table of ContentsSection Subject Pa
Page 6 and 7: I. Product Safety Sign and Label Sy
Page 8 and 9: III. IntroductionThe safety relief
Page 10 and 11: V. (Contd.)V.1.1 Standard Cap Types
Page 12 and 13: V. (Contd.)V.3 V-W Bellows Metal Se
Page 14 and 15: VI. Handling, Storage, and Pre-Inst
Page 18: VIII. Disassembly Instructions (Con
Page 21 and 22: X. Parts InspectionNozzle Inspectio
Page 23 and 24: X. Parts Inspection (Contd.)Orifice
Page 25 and 26: X. Parts Inspection (Contd.)AFigure
Page 27 and 28: X. Parts Inspection (Contd.)Orifice
Page 29 and 30: X. Parts Inspection (Contd.)Guide I
Page 31 and 32: XI. MaintenanceGeneral InformationA
Page 33 and 34: XI. Maintenance (Contd.)Table 7d: N
Page 35 and 36: XI. Maintenance (Contd.)Re-Machinin
Page 37 and 38: XI. Maintenance (Contd.)OrificeSize
Page 39 and 40: XII. ReassemblyGeneral InformationT
Page 41 and 42: XII. Reassembly (Contd.) Use a scre
Page 43 and 44: XII. Reassembly (Contd.)OrificeTabl
Page 45 and 46: XIII. Setting and TestingGeneral In
Page 47 and 48: XIII. Setting and Testing (Contd.)S
Page 49 and 50: XIII. Setting and Testing (Contd.)I
Page 51 and 52: XVI. Conversion of 1900 Series Flan
Page 53 and 54: XVII. Troubleshooting 1900 Series S
Page 55 and 56: XIX. Replacement Parts PlanningBasi
Page 57 and 58: XXI. Recommended Spare Parts for 19
Page 59 and 60: XXI. Manufacturer’s Warranty, Fie
Page 61 and 62: XXV. Optional Glide-Aloy PartsOptio
Page 63 and 64: XXVI. Sales Office LocationsMALAYSI

1900 Series - Maintenance Manual

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