IPE-EP-5-3-3

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

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

Gate Valves 5.5 Valves requiring auxiliary connections or taps shall be bossed, if required; and drilled, tapped, and plugged in accordance with ASME/ANSI B16.34 or MSS SP–45. Threads shall be in accordance with ASME/ANSI B16.34. 5.6 (*)Body bleed connections shall be provided per the requirements of EP 5–3–1. Unless otherwise specified by the Owner’s Engineer, the body bleed connection to the valve shall be seal welded. 1. Soft seal and double disc valves shall be provided with a body bleed connection, position G or H per Figure 1 of ASME/ANSI B16.34, as specified. 2. Buttwelding end valves shall be provided with a body bleed connection, position G or H per Figure 1 of ASME/ANSI B16.34. 5.7 When chainwheels are specified, they shall be of the direct mounted adjustable sprocket rim type. Chain guides shall be included. Clamp–on type chainwheels are not permitted unless specified. 5.8 The stem shall be designed to fail outside the valve pressure boundary. 5.9 If a hardness differential between seating surfaces is specified, the gate seating surface shall be the softer material. 5.10 The following additional requirements shall be adhered for all soft seated gate valves. 1. The valve shall provide seat tightness with the body bleed open, without any leakage, and at any pressure within and up to the valve pressure rating at 100°F. 2. Metal seats shall be designed and machined to provide positive shutoff capability even if the soft seal is destroyed by fire. 3. Seal height above the metal seating surface shall be per Table 2. 4. Wear travel shall not be less than that required per API 600 for the metal backup seat plus 0.09 inches minimum for the soft seat. 5. The seat width shall be 0.094 to 0.250 inches. The total remaining metal seat shall be no less than the width of the soft seat. 6. The soft seat shall be designed to withstand a minimum of 2000 cycles of operation at a valve pressure rating of 100°F, without damage or indications of cold flow, as evidenced by spreading over the metal seat. 7. Valves shall be provided with pressure relief for the body cavities if liquids can expand and increase the pressure in the body due to temperature increase of the liquid. The liquid shall be relieved to the upstream side of the valve unless otherwise specified. Final design shall be approved by purchaser. The flow direction shall be marked on the valve body. 5.11 Heat treatment of the valve, if required, shall be done after completion of all welding and before final machining of all seating surfaces. PWHT shall be performed in accordance with the provisions of ASME/ANSI B 31.3 and EP 5–5–2. 5.12 Gear operators shall be supplied in accordance with EP 5–3–1. 5.13 (*)Alternative design to that specified in this Practice shall be submitted to purchaser for approval by Owner’s Engineer. Data shall include: 1. Demonstrated experience with this valve in similar service. 2. Drawings that include bolting and gasket design details and a complete bill of materials. 3. Proof that proposed valve model will meet the “fire–safe” criteria of this Practice.

Gate Valves 10. Specify the gear operator, see paragraph 5.12. If required, include type and arrangement and the design maximum pressure differential across the valve, see paragraph 2.9 of API 600. 11. (*)Specify motor or power operator, if required, including type of power and power unit and the maximum pressure differential across the valve, see paragraph 2.9 of API 600. 12. Specify bypass, if required. Specify flanged or welded bonnet bypass valve, see paragraph 2.10 of API 600. 13. Specify the valve shell material, see paragraph 4.1 and EP 5–2–3. 14. Specify the bonnet gasket and/or bonnet flange facing, see paragraph 4.2 and EP 5–2–2. 15. Specify the API Trim Number, nominal trim material, and any required exceptions to manufacturer’s permissible options, see EP 5–3–1. 16. (*)Specify any special stem packing required, see paragraph 4.3. 17. Specify the bonnet bolt material, see paragraph 4.4 and 4.5.2. 18. (*)Specify inspection and testing requirements, see section 6. 19. (*)Specify the high pressure closure test, see EP 5–3–24. 20. Specify the packaging, see requirements of EP 5–3–21. 21. Specify the valve installed orientation. 22. Specify handwheel requirements per paragraph 3.6 of API 600. 23. Specify additional notes, if required.

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