IPE-EP-5-3-9

IPE Engineering Practice IPE-EP-5-3-9

Document number: IPE-EP-5-3-9 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Plug Valves 2) Cover joints, stem seals, and seats shall be tested and certified “fire–safe” for flow in both directions in accordance with EP 5–3–24. 5.5 (*)Valve end connections shall be in accordance with the following Standards: 1) Flanged ends: EP 5–2–2. End flanges shall be integrally cast or forged with the valve body. If specified by the Owner’s Engineer, for forged steel valves the end flanges may be welded to the body with full penetration buttwelding or by inertia welding. All flange weld procedures and inspection processes shall be submitted for approval by the Owner’s Engineer and must comply with ASME Section IX. PWHT per this practice is required for weld–on flanges and buttwelding stub ends. 2) Buttweld, socketweld, and threaded ends: per ASME/ANSI B16.34. 5.6 Handwheel (gear), round or oval handles, motor actuator, or lever operation will be specified by the Owner’s Engineer. If not specified, round or oval handles shall be provided for valves NPS 2 and smaller, and lever operators shall be provided for valves in sizes NPS 3 and larger except when Gear Operators are required. Gear Operators shall be provided per the requirements of EP 5–3–1 TABLE 5 and shall meet the following requirements: 1) Operators shall be totally enclosed, shall be weatherproof, and shall be packed with waterproof grease. 2) All fasteners shall be corrosion resistant to the service environment and gaskets shall be of good quality and shall be resistant to hydrocarbons (cardboard is not acceptable). 3) Operators shall be provided with highly visible plug position indicators so designed that incorrect installation of the indicator is not possible. 5.7 A plug position indicator shall be provided for the valve stem. The stem shape shall be such that misalignment of the plug position indicator is not possible. Stem stops shall provide positive alignment of the plug with ports, and ensure proper installation of the handle. 5.8 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 the Owner’s Engineer. The flow direction shall be marked on the valve. 5.9 (*)When specified by the Owner’s Engineer, valves shall be provided with a body bleed. The valve shall provide seat tightness with the body bleed open, without any leakage, and at any pressure within and equal to the valve seat pressure rating at 100°F. Unless otherwise specified by the Owner’s Engineer, the body bleed connection to the valve shall be seal welded. 5.10 (*)The stem and plug shall be solid alloy for all non–category D fluid services, see ASME B31.3. The plug material shall be specified by the Owner’s Engineer. 5.11 Heat treatment of the valve, if required, shall be done after completion of all welding and before final machine of all seating surfaces. PWHT shall be performed in accordance with the provisions of ASME/ANSI B31.3 and EP 5–5–2. 5.12 (*)Valves with welding ends, or with threaded ends requiring seal welds, shall permit seat and plug replacement without cutting end connections to remove the valve from the corresponding piping. Where plug valves require socket welding or seal welding of end connections, the need for disassembly or other requirements to prevent seat damage shall be investigated with the Manufacturer prior to ordering. As an alternative, the valves may be purchased with 6 inch long nipples welded in by the Manufacturer.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Plug Valves 7.4 A line–by–line description of the information to be provided on the data sheet is provided in the following subparagraphs. Each subparagraph number refers to a line number on the data sheet. An asterisk (*) indicates information that is to be furnished by the Purchaser. All items without an asterisk are stipulated in either EP 5–3–1 or this Practice or are to be completed by the Manufacturer. 1) (*)Specify the valve tag identification. 2) (*)Specify the valve size corresponding to the nominal pipe sizes of API 599. 3) (*)Specify the valve class per API 599. 4) (*)Specify the valve pattern type, see paragraph 1.1.4 of API 599. 5) (*)Specify the valve end connection type: flanged ends including facing; or welded ends, including bore. Refer to paragraph 5.5 of this Practice for additional information. 6) Specify minimum–wall or heavy–wall thickness, for stainless steel valves only, see paragraphs 2.2.1 of API 599. 7) Specify flanged ends attached by welding, see API 599 section 2.2.3 and note 3. 8) (*)Specify fire–safe design, see EP 5–3–1 and API 607. 9) Specify drain and bypass connections, see paragraph 2.2.7 of API 599. 10) (*)Specify type of operator required and wrench requirements, if any, see paragraphs 5.6 of this Practice and paragraphs 2.7.1, 2.7.2, and 3.5 of API 599. 11) Specify the locking device, see paragraph 2.7.5 of API 599. 12) (*)Specify the antistatic feature and testing, see paragraph 2.8 of API 599. 13) Specify shell and body material, see paragraph 4.1 of this Practice. 14) (*)Specify cover gasket, diaphragm, and seal materials, specify fire resistant requirements for these materials, see paragraph 4.2 of this Practice and paragraph 3.3 of API 599. 15) Specify the plug material, see paragraphs 4.1 of this Practice and 3.4 of API 599. 16) Specify materials for operating mechanisms, see paragraph 5.6 of this Practice and paragraph 3.5 of API 599. 17) Specify stem seal or packing, see paragraph 4.3 of this Practice. 18) Specify bolting material for temperatures beyond the limits specified in ASME B31.3 or for increased resistance to corrosive environments, see paragraph 3.8 of API 599, and paragraph 4.4 of this Practice. 19) Specify lubricating sealant, see paragraph 4.1 of API 599. Specify sealant and/or operating temperature if temperature is outside the range from –20°F through 225°F. 20) Sleeve, seat, lining, or coating material see paragraph 4.2 of API 599. 21) Specify the inspection and testing requirements, see paragraph 6.0 of this Practice. 22) Specify the high pressure closure test, see EP 5–3–24. 23) Specify packaging, see requirements of EP 5–3–21. 24) Specify additional notes, if required.

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