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1900 Maintenance Manual

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valve maintenance
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  1900 Series - Maintenance Manual Consolidated ®  Safety Relief Valve Pressure Relief Valves  Conversion Table USCS UnitConversion FactorMetric Unit* in.25.4mmlb.0.4535924kgin 2 6.4516cm 2 ft 3  /min0.2831685m 3  /mingal/min3.785412L/minlb/hr0.4535924kg/hrpsig0.6894757bargft lb1.3558181Nm°F5/9 (°F-32)°C *   Multiply USCS value with Conversion Factor to get Metric value.  All the USCS values in the Manual is converted to Metric values using following convertion factors:  1900 Series Safety Valve   (July/2010) | 3 Table of Contents I. Safety Sign and Label System ................................................................................................ 5 Safety Alerts! Read - Understand - Practice . ...................................................................... 5II. Terminology for Safety Relief Valves ..........................................................................................7III. Introduction .............................................................................................................................8IV. Design Features and Nomenclature .........................................................................................8 V. Consolidated 1900 Series Safety Relief Valve ...........................................................................9 VI. Handling, Storage, and Pre-Installation ..................................................................................14 VII. Recommended Installation Practices ..................................................................................... 15 Mounting Position ............................................................................................................ 15 Inlet Piping ....................................................................................................................... 15 Outlet Piping .................................................................................................................... 16 VIII. Disassembly Instructions ....................................................................................................... 17 General Information .......................................................................................................... 17 SRV Disassembly ..............................................................................................................17IX. Cleaning ................................................................................................................................20 X. Parts Inspection .....................................................................................................................21 Nozzle Inspection Criteria ................................................................................................. 21 Nozzle Seat Width ............................................................................................................ 21 Nozzle Bore Inspection ..................................................................................................... 21 1900™ Series SRV Standard Disc Inspection Areas .......................................................... 21 1900™ Series Thermodisc® Replacement Criteria ........................................................... 21 Disc Holder Inspection Criteria ......................................................................................... 26 Guide Inspection Criteria .................................................................................................. 29 Spindle Inspection Criteria ................................................................................................ 29 Spring Inspection Criteria .................................................................................................. 30 XI. Maintenance ......................................................................................................................... 31 General Information .......................................................................................................... 31 Lapping Nozzle Seats (Non-O-Ring Styles) ........................................................................ 31 Lapped Nozzle Seat Widths .............................................................................................. 31 Lapping Disc Seats ............................................................................................................32 Precautions and Hints for Lapping Seats. ...........................................................................33 Lapping O-Ring Seating Surfaces ......................................................................................34 Reconditioning of Laps ......................................................................................................34 Re-Machining Nozzle Seats and Bores ..............................................................................35 Re-Machining the Disc Seat .............................................................................................. 35 Checking Spindle Concentricity ..........................................................................................36 Set Pressure Change-Disc Holder .....................................................................................36 Checking Lift on Restricted Lift Valves ............................................................................... 36 SectionSubjectPage No  4 |  Dresser Consolidated ®  XII. Reassembly ...................................................................................................................................39 General Information ...................................................................................................................39 Preparation ................................................................................................................................39 Lubrication ................................................................................................................................39 Reassembly Procedure ..............................................................................................................39 XIII. Setting and Testing .........................................................................................................................45 General Information ....................................................................................................................45 Test Equipment .........................................................................................................................45 Test Media .................................................................................................................................45 Setting the Valve.........................................................................................................................45 Set Pressure Compensation ......................................................................................................45 Seat Tightness Testing ...............................................................................................................47 XIV. Hydrostatic Testing and Gagging ....................................................................................................49 XV. Manual Popping of the Valve ..........................................................................................................49 XVI. Conversion of 1900™ Series Flanged SRVs ...................................................................................50 General Information ....................................................................................................................50 Conversion from Conventional to Bellows Type ..........................................................................50 Conversion from Bellows to Conventional Type ..........................................................................50 XVII. Troubleshooting 1900™ Series SRVs ............................................................................................53 XVIII. Maintenance Tools and Supplies ....................................................................................................53 XIX. Replacement Parts Planning ..........................................................................................................55 Basic Guidelines ........................................................................................................................55 Replacement Parts List ..............................................................................................................55 Identification and Ordering Essentials .........................................................................................55 XX. Genuine Dresser Parts ...................................................................................................................56 XXI. Recommended Spare Parts for 1900™ Series SRVs .....................................................................57 XXII. Manufacturer’s Warranty, Field Service, Training, and Repair Program ............................................59 Warranty Information ..................................................................................................................59 Field Service ...............................................................................................................................59 Factory Repair Facilities ..............................................................................................................59 SRV Maintenance Training ..........................................................................................................60 XXIII. Self-Study Edition of the 1900™ Series SRV Maintenance Training Program ..................................60 XXIV. Optional Glide-Aloy™ Parts ...........................................................................................................61 XXV. Sales Office Locations ....................................................................................................................62 SectionSubjectPage No Table of Contents
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