API 526:2002 pdf download
API 526:2002 pdf download.Flanged Steel Pressure Relief Valves.
3 Material
3.1 GENERAL
Materials generally used for construction are covered in this section. For special corrosion pmblems and applications beyond the pressure-temperature limits of this standard, construction materials shall be those agreed upon by the manufacturer and the purchaser.
3.2 SPRING-LOADED PRESSURE RELIEF VALVES
The body, bonnet, and spring materials shall be in accordance with Tables 2 — 1$ for the required temperature range. The body and bonnet may be of dill&nt materials but must meet the minimum pressure-temperature requirement. The body and bonnet materials shall be equivalent to or better than the lollowing types and grades:
Curboi ,aed ASME SA 216, Grade WCB
Chromium nsilyhikmirn eeI ASME SA 217. Grade WC6
Aw.lcniiic sgainIcs sirel ASME. SA 351. Grade CFtM
Nickel/Copper Alloy ASME SA 494 Grade M35- I
Alloy 20 A.SME SA 351 Grade CN7M
Material for the internal parts of the valve shall be in accordance with the manufacturer’s standards for the temperature and service or as indicated on the purchaser’s speciticafion sheet.
3.3 P1 LOT-OPERATED PRESSURE RELIEF VALVES
The body material shall be in accordance with Tables 16—29 for the required temperature range. The body material shall be equivakn to or beller than the following types and grades:
Carbon steel ASME SA 216, Grade WCH
Austeniuc stainles’. ,.Icel ASME SA 351, Grade (EtM
NickeL’Copper Alloy ASME SA 494. Grade M35-l
Alloy 20 ASME SA 351. Grade CN7M
Material for the pilot and internal parts of the valve shall be in accordance with the manufacturer’s standards for the temperature and service or as indicated on the purchaser’s specification sheet.
4 Inspection and Shop Tests
4.1 INSPECTION
The purchaser reserves the right to witness the shop tests and inspect the valves in the manufacturer’s plant to the extent specified on the purchase order.
4.2 SET PRESSURE TEST
All pressure relief valves shall be adjusted to the specified set pressure in accordance with the ASME Boiler and Pressure Vessel Code, the manufacturer’s standard practice as published, or as designated by the purchaser. All set pressure adjustments shall be sealed.
4.3 SEAT LEAKAGE TEST
All pressure relief val.es shall he seat leakage tested in accordance with API Std 527. or as agreed upon by the manuI acturer and the purchaser.
5 Identification and Preparation for Shipment
5.1 IDENTiFICATION
Each pressure relief valve shall have a corrosion-resistant nameplate permanently attached to the body or bonnet. This nameplate shall be stamped with the data specified in Appendix B. Pilot-operated pressure relief valves shall have an additional nameplate permanently attached to the pilot. The pilot nameplate shall be stamped with the manufacturer’s name. pilot type. set pressure. and serial number.
Each pressure relief valve shall be tagged with the purchaser’s valve number or other identification as specified on the purchase order. The data may be stamped on the nameplate or on a separate corrosion-resistant tag that is permanently attached to the valve.
5.2 PREPARATION FOR SHIPMENT
Each pressure relief valve shall be prepared for shipment as follows:
a. After test and inspection, all exterior surfaces, except flange facings. shall be painted as agreed upon by the manufacturer and the purchaser. Corrosion-resistant materials need not be painted. Flange facings shall be coated with a suitable corrosion inhibitor.
h. Threaded openings shall he plugged with suitable protective devices. Temporary plugs should be readily distinguishable from permanent metal plugs.
c. Inlet and outlet flanges shall be protected to prevent daniage from or entrance of foreign material during shipment.
