Trillium 74LP Series Installation, Operation & Maintenance Manual
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Trillium 74LP Series Installation, Operation & Maintenance Manual

Pressure relief valve
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74LP SERIES
Installation, Operation,
Maintenance Manual

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Summary of Contents for Trillium 74LP Series

  • Page 1 74LP SERIES Installation, Operation, Maintenance Manual...

  • Page 2: Table Of Contents

    6.1 RESPONSIBILITIES ........................7 6.2 IDENTIFICATION PLATE ......................7 6.3 PILOT SPRING ........................8 6.4 STORAGE ..........................9 6.5 HANDLING ..........................9 7 74LP SERIES BASICS ..........................10 7.1 DESCRIPTION ......................... 10 7.2 FEATURES AND NOMENCLATURES ..................10 8 INSTALLATION ............................

  • Page 3: Safety Signs And Labels

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ SAFETY SIGNS AND LABELS Signs or labels are included throughout this document. These signs or labels communicate the following messages: • The level of hazard seriousness • The nature of the hazard • The consequence of human or product interaction with the hazard •...

  • Page 4: Safety Instructions

    Consequently, anyone who uses a procedure and/or tool, which is not recommended by Trillium Flow Technologies , or...

  • Page 5: Safety Precautions

    • Never modify or change the valves, especially when they are under pressure. It is essential that you inform Trillium Flow Technologies™ in ALL instances if any machining of parts is to be considered. Deviation from critical dimensions can adversely affect the performance of a safety valve.

  • Page 6: Warranty Information

    Trillium Flow Technologies warrants that its products (including performance) and work will meet the specifications of the customer’s Purchase Order. If any issue arises whilst operating the product, the customer should inform Trillium Flow Technologies as quickly as possible. A return to the original plant should then be considered in order for Trillium Flow Technologies to inspect the product.

  • Page 7: Terminology

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 5 TERMINOLOGY For the purpose of this manual, the following abbreviations, definitions and terms apply ACCUMULATION The pressure increase over the maximum allowable working pressure of the vessel, expressed in pressure units or as a percentage of maximum allowable working pressure (MAWP) or design pressure.

  • Page 8: General Advice

    The recommended practices indicated within this manual must be respected to prevent any potential damage to goods. It is important that all points of advice are followed closely and are implemented by suitably qualified personnel. Trillium Flow Technologies disclaims all responsibility for maintenance operations which may be...

  • Page 9: Pilot Spring

    • Above than +5% adjustment can cause permanent deformation to the spring. • Below than -5% adjustment can cause the pilot not to open fully. • For more than +/- 5% adjustment you must contact Trillium Flow Technologies Sarasin-RSBD Aftersales Department.

  • Page 10: Storage

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 6.4 STORAGE ATTENTION ATTENTION Never lift the valve Make sure the valve is not horizontally, or hook to the dropped and does not receive lifting lever or the spring. strikes. Always lift by using the lifting eyes or sling.

  • Page 11: 74Lp Series Basics

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 74LP SERIES BASICS 7.1 DESCRIPTION Pilot operated pressure relief valves dedicated to LNG and FLNG installations but can also be used in any moderated temperature application. The nozzle has been designed to have the best flow coefficient possible.

  • Page 12: Installation

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 8 INSTALLATION 8.1 GENERAL DANGER WARNING CAUTION CAUTION Be aware that the Never face the outlet of a Protect against high noise Helmets and gloves must environment might be valve when it is levels which occur during be worn to prevent any extremely hot.

  • Page 13: Outlet Piping

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 8.3 OUTLET PIPING The safety valve must not support either the weight or the installation stresses of the outlet piping. The backpressure should be reduced by using outlet piping with a nominal diameter of at least equal to the nominal diameter of the safety valve outlet flange, together with large radius elbow.

  • Page 14: Options

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 8.5 OPTIONS REMOTE SENSE • Safety valve will respond to actual system pressure conditions. • Eliminates undesirable cycling due to excessive inlet pressure losses. • Improves safety, under adverse operating conditions. This optional feature permits the pilot to sense system pressure at a location that most accurately reflects the actual operating pressure of the protected system.
  • Page 15 • In-service verification of set pressure. • Simplifies the periodic testing of safety valves. Trillium Flow Technologies pilot operated safety valves may be readily tested for verification of set pressure during normal system operation with this option. Its connection is 1/4” NPT. The customer furnishes a pressure source, plus a pressure-reducing valve and a test gauge for the portable field testing system.
  • Page 16 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ • Back flow preventer • Prevents accidental reverse flow through safety valve. This option prevents a pilot operated safety valve from reverse flow, when sufficient vacuum is present at the inlet flange. The backflow preventer also prevents reverse flow when the pressure at the outlet flange (superimposed back pressure) is greater than the current system pressure.

  • Page 17: Outdoor Installation

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 8.6 OUTDOOR INSTALLATION A safety valve which is installed outdoors must be protected against any inclement environmental conditions to ensure that it will provide the highest level of safety and will operate in the most effective & responsive manner. If the safety valve is exposed to hazardous weather conditions, ingress of dirt or other foreign matter or any extremes of temperature conditions, please ensure that: •...

  • Page 18: Maintenance

    No particular tool is required for the maintenance operations on the main valve of the 76 series valve. Regarding the pilot, a tool kit is recommended to ease the lapping and the re-assembly of disc in the pilot body. Maintenance may be performed without taking the valve off line. Please contact Trillium Flow Technologies SarasinRSBD aftersales team in the event of any uncertainty.

  • Page 19: Disassembly

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 9.1 DISASSEMBLY • First, ensure pressure in bled off in the main valve!!!(Outlet & inlet) - Unscrew Plug (Rep34) • PILOT /MAIN VALVE DISSASEMBLY - Unscrew fitting CLVF and FLPF. - Unscrew Nuts (013) and remove Nord-lock washers (012).
  • Page 20 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ • MAIN VALVE DISASSEMBLY FIGURE 2-MAIN VALVE GENERAL VIEW • Disassembly cover (002) - Unscrew lifting lugs. - Unscrew nuts (050) and remove lock washers (050-1) - Take the upper cover off (002) www.trilliumflow.com...
  • Page 21 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ Disassembly trim/Main Valve • - Remove the diaphragm gasket (040) - Put a lifting lug through the screw (018) and lift all the trim (Only seat (006) remains in place). FIGURE 3 – DISASEMBLY TRIM/MAIN VALVE www.trilliumflow.com...
  • Page 22 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ • Disassembly trim - To remove the diaphragm (020), unscrew the screw (018) from spindle (012). - To remove the guide sleeve (008), unscrew the screws (037) and remove it of the guide (009). - To remove the primary seal(007),unscrew the screws (038)and remove the disc flange(016) Then unscrew the nut (019) and remove the primary seal (007) by holding spherical screw (015).

  • Page 23: Main Valve Parts Inspection & Maintenance

    74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ 9.2 MAIN VALVE PARTS INSPECTION & MAINTENANCE 9.2.1 GENERAL RECOMMENDATIONS We recommend to carefully store the disassembled valves per serial number not to mix-up parts during inspection and maintenance. Changes from one valve part to another can be invisible to the eye and may compromise perfect valve operation during its whole life cycle.

  • Page 24: Main Valve Re-Assembly

    - Tighten the screws (036) with Nord-Lock washer to rated torque shown on Table 1. ® Grease the threads with cryogenic grease. Nota: Trillium Flow Technologies recommended to use cryogenic and oxygen grease type ORAPI CT830 (- 40°C/+280°C) or CT1240(-40°C/320°C).
  • Page 25 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ FIGURE 9-SEAT Warning: The Nord-Lock washer (036-1) is in 2 parts. ® Ensure there are correctly stacked like the Figure 10. Nominal diameter Tightening torque (mm) m.daN TABLE 1 - TIGHTENING TORQUE FIGURE 10-NORD-LOCK STACKING ®...
  • Page 26 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ Primary seal (007) - Tighten the screw (019) with Nord-Lock washer to torque show on Table 1. ® Nota: For the Nord-Lock washers stacking, please refer to the Figure 10. ® The primary seal should be replaced after each service FIGURE 11-PRIMARY SEAL •...
  • Page 27 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ • Guide (009) - Slide the guide sleeve (008) in the guide (009). Do not grease!! - Tighten the screw (037) with Nord-Lock washer (037-1) to torque show on Table 1. ® Nota: For the Nord-Lock washers stacking, please refer to the Figure 10.
  • Page 28 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ FIGURE 14-DIAPHRAGM ASSEMBLY www.trilliumflow.com...
  • Page 29 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ • Trim assembly - Put a lifting lug through the screw (018). Slide the lower cover (002) on the body threaded rods (035).Once the lower cover is landed on the body, slide progressively the disc flange assembly until the primary seal come in contact with the disc. Warning: Relieving suddenly the assembly will make impact marks on the primary seal and the disc seating surfaces.
  • Page 30 74LP PRESSURE RELIEF VALVE SARASIN-RSBD ™ - Insert the second gasket (040) on the diaphragm (020). - Insert the upper cover (002) on the body treaded rods (035). - Grease the studs(035),tighten the nuts (050)with Nord-lock washer(051) ® to torque show on Table 2 for PTFE or NBR Diaphragm. Respect the bolting pattern show on Figure 18 !! Nota: For the Nord-Lock washer stacking, please refer to the Figure 10...

  • Page 31: Maintenance Tools

    ½ blowdown value The valve chatters The valve is oversized Investigate what is the real process condition and check the sizing with Trillium Flow Technologies The upstream pressure drop is too high Sensing the pressure remote instead of through the sensing ring.

  • Page 32: Spare Parts

    Such work must be carried out by a skilled technician. The Trillium Flow Technologies Group offers trainings and education programmes to cover all areas of maintenance and repair. Please consult your nearest Trillium Flow Technologies representative for more details. To perform basic maintenance tasks within the shortest possible timeframe, it is recommended that class “A” spare parts are purchased at the same time as new valves.

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