Section 5 — Piping

IPE-EP-5-3-13

IPE Engineering Practice IPE-EP-5-3-13

Document number: IPE-EP-5-3-13 · Section: 5 — Piping

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Cyclic Reformer Motor Operated Valves 5.4 Valves shall be a full port configuration designed for use in the fully open or fully closed positions. 5.5 (*)Face–to–face dimensions and the valve end connection type are to be specified by the Owner’s Engineer for specific unit requirements using the sketches shown in Figure 3. Additional information must be developed by the Owner’s Engineer to utilize this figure. The opportunity to reduce the number of pipe flanges in the system should be considered during scheduled valve replacement since the installed cost between the options shown in Figure 3 may be comparable. In addition, a reduction in the number of flanges in the system will reduce the risk of flange leakage. For example, if a flanged double block valve set is being replaced, they may be ordered with a welded spool piece between them with installation flanges only at the ends. 5.6 Valves shall be outside screw and yoke (OS & Y) design type with rising stem. 5.7 The design of the stem, stem nut, and stem–to–wedge connection shall meet the requirements of API 600 including the intent that the strength of the connection shall exceed the strength of the stem at the root of its operating thread. 5.8 (*)Valves shall have a boss provided only at position “H” (bonnet) as designated by Figure 1 of ASME/ANSI B16.34. Unless otherwise specified by the Owner’s Engineer, all other bosses shall be removed from cast valves to reduce stress concentrations. 5.9 Bonnet vents shall be located so as to vent the whole bonnet area up to the backseat bushing. Vents shall be provided per Figure 4 and as necessary to comply with the API 598 high pressure closure test across one seating surface, see EP 5-3-24. 5.10 Valve end connections shall conform to the following requirements. 5.10.1 Valve end connections shall be butt–welded or flanged. Weld bevels shall conform to ASME/ANSI B16.34 for use without backing rings. Flanged ends and facing finish shall be in accordance with EP 5–2–2. 5.10.2 Slip–on type flanges shall not be used for fabricated valves. 5.10.3 (*)To facilitate field installation of valves with butt welded ends, welding stubs may be specified by the Owner’s Engineer. If specified, these should be shop welded to the valves before final shop heat treatment. The stub length shall be 6 inch minimum to avoid potential distortion of the valve body or seat during field installation. If possible, based on field piping layout considerations, the stub length should be the same for each valve service and valve end to maximize interchangeability. 5.10.4 (*)Double block valve sets with butt–welded ends shall have a spool piece welded between them to facilitate potential subsequent valve removal. A one inch bleed connection shall be provided in the spool piece. The length of this spool piece shall be specified by the Owner’s Engineer based on the space requirement for the pipe cutting equipment that would be used; however, a 20 inch long spool piece is recommended. The spools shall be either shop or field– shop welded (not on pipe rack) to the valves. 5.11 Bonnets shall conform to the following requirements.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Cyclic Reformer Motor Operated Valves 5.11.1 Valves shall have a through bolted bonnet. Proprietary type bonnet designs will be considered if they can be seal welded per the next paragraph and if design and operating experience are submitted for review. The bonnet flange design shall satisfy the requirements of ASME Section VIII Division 1, Appendix 2, for both the gasketed and seal welded pressure loading conditions and the gasket seating condition. 5.11.2 The valves shall have bonnet flanges supplied with the facility for seal welding per Figure 5. The seal welding nibs shall be of a non–air hardening material. Seal welding of these nibs is performed in the field after completion of all testing, descaling and line blowing. The nibs shall be suitable for a minimum of ten (10) openings for required maintenance. The manufacturer shall submit in their proposals a design for these nibs and their welding. The successful valve manufacturer will be required to submit a full procedure covering the field welding of these nibs, the method for cutting, the bonnet bolting torque requirements, boltup procedure, etc. This procedure shall be demonstrated by successfully seal welding, pressure testing and removing the seal weld on the first production valve. The test shall be conducted under simulated field conditions and shall be witnessed by an Inspector. 5.11.3 Bonnet flanges shall have a tongue and grooved flange face. The flange shall be designed so as not to over–compress the spiral wound gasket. 5.11.4 Bolting of the bonnet–to–body joint assembly shall be in accordance with the following requirements. 1) (*)A bolt tightening procedure (including a cross–bolting diagram) shall be prepared by the valve Manufacturer and shall be approved by the Owner’s Engineer. 2) A hydraulic torque wrench or hydraulic bolt tensioner shall be used to tighten the joint. An ultrasonic elongation measurement device shall be used to control the bolting. A tolerance of ” 15% of the target stress value is required. Bolting procedures and the use of ultrasonic control shall be in accordance with EP 5–5–4. 5.12 Seat rings are to be seal welded to valve body. 5.13 The valve disk shall conform to the following requirements. 5.13.1 The valve disk design shall be one of the following types and shall be designed to minimize the potential for scoring of the seating surfaces: 1) Double disk. 2) Split wedge design with spreader device. 3) Wedge in wedge design similar to the Zimmerman & Jansen type. 4) Flexible wedge design. 5.13.2 The selected disk design must be capable of tight shut off, and this shall be demonstrated by the following: 1) By operating experience under similar service conditions with demonstrated tight shut off. 2) By demonstrating that the valve can pass the low pressure seat and high pressure closure tests with the body bleed valve open, see EP 5–3–24. 5.14 The valve stuffing box shall be provided with a lantern ring and furnished with a pipe tapped and plugged opening, see Figure 1. Chemical and physical requirements for the lantern ring are the same as those for the valve body. 5.15 Connections for vents, drains, etc., shall be a 1–1/4 Cr –1/2 Mo, ANSI Class 3000, integrally reinforced, socket welding fittings per ANSI B16.11.

CoInafsletcatilo nA Prouinbta E nEgningeeirninege Prriancgtic Pesractices Cyclic Reformer Motor Operated Valves 7.2 The completed valve data sheet can be used in conjunction with this Practice and EP 5–3–21 as a purchase specification. 7.3 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 600. 3) (*)Specify the valve class per API 600. 4) (*)Specify the valve end connection type: flanged ends including facing; or welded ends, including bore. Refer to paragraph 5.10 for additional information. 5) (*)Type of construction: specify Fabricated Forged, Fabricated Wrought, or Cast. Fabricated forged valves are currently recommended. 6) (*)Specify drain and vent connections, see paragraphs 5.8, 5.9, 5.10.4, 5.14 and 5.15. 7) (*)Specify wedge type, see paragraph 5.13. 8) Lantern ring, see paragraph 5.14. 9) Chainwheel and chain, these items are typically not required. If required, see paragraph 2.9 of API 600. 10) Specify the gear operator, this item is typically not required. If required, including 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) Bypass, if required. Specify flanged or welded bonnet bypass valve, see paragraph 2.10 of API 600. 13) Valve shell material, see Table 1. 14) Bonnet gasket and/or bonnet flange facing, see paragraph 5.11.3. 15) API trim number, nominal trim material, and any required exceptions to manufacturer’s permissible options. All trim materials are specified in Table 1 and paragraph 4.2. 16) Special stem packing required, see paragraph 4.3. 17) Bonnet bolt material, see Table 1. 18) Inspection and testing requirements, see section 6. 19) High pressure closure test, see EP 5–3–24. 20) Specify export packaging, see requirements of EP 5–3–21, specify any additional requirements. 21) (*)Specify the valve installed orientation, configuration and length, see paragraph 5.5. 22) Handwheel requirement, this item is typically not required. If required, see paragraph 3.6 of API 600. 23) Specify additional notes, if required.

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