IPE-EP-5-3-10

IPE Engineering Practice IPE-EP-5-3-10

Document number: IPE-EP-5-3-10 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Ball Valves 4.2 The body to cover flange gasket shall be one listed in API 600 and shall meet the requirements of EP 5–2–2. 4.3 Valve stem finish, packing and packing tolerances and clearances shall comply with the requirements of EP 5–3–23. 4.4 (*)Soft seat rings, and supplementary “O” ring stem, bonnet and body seals, made of modified or glass reinforced PTFE or FEP (Teflon) are acceptable. Alternative materials shall be at least equal to PTFE or TFE and suitable for the line service classification, and are subject to the approval of the Owner’s Engineer. 4.5 All nonmetallic materials used in the ball valve shall be capable of withstanding the maximum temperature encountered in service and during steamout. Service limits for soft–seat materials shall be in accordance with EP 5–3–1. 4.6 (*) Body and bonnet bolting material shall be specified, and shall be of the same material specification as the bolting used for the connecting piping, see EP 5–2–2. 4.7 For carbon steel and ferritic alloy steel valves: 1) (*) Gland bolts shall be 13 Cr minimum, unless otherwise specified by the Owner’s Engineer. 2) Ball materials shall be as follows: • 13 Cr (Chrome plated balls are acceptable) • AISI Type 316 • Carbon steel overlayed with AISI Type 316, 0.060 inches minimum finished thickness. • Carbon steel with a nickel overlay on the seating surface when the ball does not contact the seat when rotated (for example, an Orbit valve). 3) Stem material shall be as follows: • 13 Cr • 17–4PH stainless steel per EP 10–2–2. • (*) Manufacturer’s standard if approved by the Owner’s Engineer. 4.8 For austenitic stainless steel valves (body and bonnet): 1) Stem, metal seats, gland assemblies including bolting, and trunnion support materials shall be of the same nominal chemistry as the body. Seat retainer ring screws shall be strain hardened. 2) The ball material shall be austenitic stainless steel. 4.9 Hard chrome plated balls are only acceptable if the following criteria is met: 1) A description of the plating process and user experience is provided by the Manufacturer. 2) The service is not abrasive. 3) Owner’s Engineer approval. 4.10 The valve handle shall be heat resistant and capable of withstanding direct exposure to fire, per the API 607 testing procedures, without becoming inoperable. 4.11 Valves for use in sour gas (Wet H S) service shall use materials which conform to NACE MR0175, except that material hardness requirements for the body, bonnet, and stem shall be per EP 10–2–3. In addition, free machining steels as defined in this Practice shall not be used in sour gas service.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Ball Valves 5.11 Valve end connections shall be in accordance with the following Standards: 1) (*) Flanged ends; EP 5–2–2. Each flange 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 valve 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 butt–welding stub ends. 2) Buttweld, socket weld, and threaded ends: per ASME/ANSI B16.34. 5.12 The Manufacturer shall guarantee that operation will not be impaired by rapid temperature reduction when the valve is opening or throttling (as in LPG service). 5.13 Body joints, gaskets, and bolting shall conform to API 608 and EP 5–2–2. The joints shall be either male–and–female, tongue–and–groove, or ring–joint type. 5.14 The Manufacturer shall certify the body joints in multi–piece valves are capable of withstanding loads imposed by a fully stressed connecting piping system, with no resultant joint leakage. A fully stressed piping system has the maximum allowable calculated stresses due to sustained loads or displacement strains as defined in ASME B31.3. 5.15 Stem seals shall be capable of being tightened while under pressure. “O” rings may be used in conjunction with stem packing, but the use of “O” rings in lieu of stem packing is not permitted. 5.16 A ball position indicator shall be provided with the valve stem for non–rising stem ball valves. The stem shape shall be such that misalignment of the ball position indicator is not possible. Stem stops shall provide positive alignment of the ball with ports, and ensure proper installation of the handle. 5.17 (*) 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 2 NPS and smaller, and lever operators shall be provided for valves in sizes 3 NPS and larger except when Gear Operators are required. Gear Operators are required per EP 5–3–1 and shall conform to the following: 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 ball position indicators to prevent incorrect installation of the indicator. 5.18 (*) 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. All valves with hollow–ball construction shall be provided with this pressure relief feature. The flow direction shall be marked on the valve. 5.19 (*) 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 seal rating at 100°F. Unless otherwise specified by the Owner’s Engineer, the body bleed connection to the valve shall be seal welded.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Ball 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 in API 608. 3) (*) Specify the valve class per API 608. 4) (*) Specify the valve end connection type: flanged ends including facing; or welded ends, including bore. Refer to paragraph 5.11 and 5.21 for additional information. 5) (*) Specify an integral or welded extension or flange, if applicable. 6) (*) Specify the valve materials of construction. 7) (*) Specify seat materials, see paragraphs 4.4 and 4.5 of this Practice, and paragraph 3.3 and section 5 of API 608. 8) (*) Specify bleed and drain connections, see EP 5–3–1 and paragraph 5.19. 9) (*) Specify the valve port size, see paragraph 4.3 of API 608. 10) Specify Electrical Continuity, see paragraph 4.4 of API 608. 11) (*) Specify the operator type, see paragraph 5.17 of this Practice and paragraph 4.5 of API 608. 12) Specify the type of construction: Forged or Cast. 13) Specify special external coating, see paragraph 7.1 of API 608. 14) Specify the arrangement to prevent overpressure of the body cavity, see ASME/ANSI B16.34, paragraph 2.3.3. 15) (*) Specify special stem packing, see paragraph 4.3. 16) Specify inspection and testing requirements, see section 6. 17) Specify high pressure closure test, see paragraph 6.1. 18) Specify export packaging, see requirements of EP 5–3–21. 19) (*) Specify fire–safe design tested in accordance with the current edition of API 607. 20) Specify additional notes, if required.

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