IPE-EP-5-3-6

IPE Engineering Practice IPE-EP-5-3-6

Document number: IPE-EP-5-3-6 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Compact and Extended Body Gate and Globe Valves 5.3 The valve end connections shall conform to the following: 1. Ends of socket welding valves shall be per API 602. 2. Butt welding ends of integrally reinforced extended body valves shall be per the following: • Weld bevel preparation shall be per API 602. • Dimensions and OD tolerance of the centering ring (if any) shall be furnished to purchaser by the valve manufacturer. 3. (*)Flanges for flanged end valves shall be integral with the body and be in accordance with EP 5–2–2. For forged steel valves, flanges may be welded to the body with full penetration buttwelding or by inertia welding if approved by the Owner’s Engineer,. All flange weld procedures and inspection processes shall be submitted for approval by the Owner’s Engineer and must comply with ASME Section IX. 4. All valve bodies with welded–on flanges or butt–welding stub ends shall be postweld heat treated per paragraph 5.10. 5. Threaded valves shall have internally tapered threads, except the male extension of threaded end extended body valves per API 602 shall have externally tapered threads. Threads shall be per API 602. 5.4 The stem design shall conform to the following: 1. The stem shall have an integral conical or spherical backseat surface to seat against the bonnet backseat with the valve fully open. 2. The stem shall be designed to fail outside the valve pressure boundary if excess force is applied to the handwheel. 3. The minimum stem diameter shall be per API 602. 5.5 Globe valves shall have a swivel plug disk. 5.6 Bonnet design shall conform to the following: 1. (*)Valves shall have a bolted bonnet, unless a welded bonnet is specified. Welded bonnet construction is permitted only for carbon steel valves furnished entirely to API 602, or for carbon steel Class 1500 and Class 2500 valves where the valve design has been approved by the Owner’s Engineer. Additional requirement for welded bonnets are as follows: • Electron beam welding of the bonnet is not permitted. • Bonnet welds shall have a max 200 Brinell hardness. • The valve Manufacturer shall demonstrate to the satisfaction of the Owner’s Engineer that it can obtain adequate weld penetration with the procedure selected for the bonnet weld. 2. The bonnet joint shall be designed to withstand all the temperature–pressure ratings without any leakage, for the rating specified. 3. Bonnet bolts shall have coarse threads. 5.7 If socket welding valves with welded–in stubs requiring post weld heat treatment (PWHT) are specified by the Owner’s Engineer: 1. Stubs shall be 6 inches long. 2. Valve body and stub assembly shall be PWHT per paragraph 5.10 of this Practice.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Compact and Extended Body Gate and Globe Valves 7. (*)Specify the body bonnet joint type, see paragraph 5.6 of this Practice. 8. (*)Specify the extension length for extended body valves, see paragraph 4.3 of API 602. 9. (*)Specify the API trim number, nominal trim material, and any required exceptions to manufacturer’s permissible options, see paragraph 4.8 of API 602 for compact body valves. 10. Specify the flange facing finish, see API 602 (section 4.2.6). 11. Specify the body bonnet joint gasket, see API 602 (section 4.7.5). 12. Specify the bonnet bolt material, see paragraph 4.4 of this Practice. 13. Specify the high–pressure closure test, if needed. See API 598 (section 3.4) for additional item that may need to be specified. 14. Specify valve stem packing required, see paragraph 4.3 of this Practice. 15. Inspection and testing requirements, see section 6 of this Practice. 16. Specify packaging, see requirements of EP 5–3–21. 17. Specify a integral or welded extension or flange, see paragraphs 4.2.4 and 4.4 of API 602 respectively. 18. Specify whether an extension or flange is to be welded to the body using a backing ring, see paragraph 5.9 of this Practice and paragraphs 4.2.4 and 4.4 of API 602 respectively. 19. Specify PWHT requirements for the welded extension, see paragraph 5.10 of this Practice and paragraphs 4.2.4 and 4.4 of API 602. 20. Specify the supplementary examination, see API 598 (section 2.6) 21. Specify additional notes, if required.

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