2021-06-24_REVISION - M2012032 - Laserfiche WebLink

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ASME B31.3-2016 components shall be suitable for the manufacturing pro- M306.5 apply to openings in closures [see also cess and the fluid service. para. 304.4.2(b)]. M306.1 Pipe Fittings Paragraph 306.1 applies in its entirety,with the excep- M307 METALLIC VALVES AND SPECIALTY tion of paras. 306.1.3 and 306.1.4. See para. M306.1.3. COMPONENTS M306.1.3 Specific Fittings The following requirements for valves shall also be (a) Proprietary welding branch outlet fittings that met as applicable by other pressure-containing piping have been design proof tested successfully as prescribed components, e.g., traps, strainers, and separators. See in ASME B16.9, MSS SP-97, or the BPV Code, also Appendix F, paras. F301.4 and F307. Section VIII, Division 1, UG-101 may be used within M307.1 General their established ratings. (b) Fittings conforming to MSS SP-43 and MSS SP-119 Paragraph 307.1 applies, subject to the requirements - shall not be used. in para. M307.2. (c) Proprietary"Type C"lap-joint stub-end buttweld- M307.2 Specific Requirements ing fittings shall not be used. (a) Paragraph 307.2.2 applies. M306.2 Pipe Bends (b) Valves having threaded bonnet joints (other than Paragraph 306.2 applies, except that bends designed union joints) shall not be used. as creased or corrugated shall not be used. (c) Only metallic valves conforming to the following requirements may be used: M306.3 Miter Bends (1) Special consideration shall be given to valve A miter bend shall conform to para. 306.3.1 and shall design to prevent stem leakage to the environment. not make a change in direction at a single joint(angle a (2) Bonnet or cover plate closures and body joints in Fig. 304.2.3)greater than 22.5 deg. Paragraph 306.3.3 shall be flanged, secured by at least four bolts with does not apply [see para. M300(e)]. gasketing conforming to para. 308.4; or proprietary, attached by bolts,lugs,or other substantial means,and M306.4 Fabricated or Flared Laps having a gasket design that increases gasket compres- M306.4.1 General. The following requirements do sion as fluid pressure increases; or secured with a full not apply to fittings conforming to para.M306.1,nor to penetration weld made in accordance with para.M311; laps integrally forged on pipe ends. Paragraph 306.4.1 or secured by a straight thread sufficient for mechanical applies. strength, a metal-to-metal seat, and a seal weld made in accordance with para. M311, all acting in series. M306.4.2 Flared Laps. Flared laps shall not be used. M306.5 Fabricated Branch Connections M308 FLANGES, BLANKS, FLANGE FACINGS, AND The following requirements do not apply to fittings GASKETS conforming to para. M306.1. Paragraph 306.5.1 applies, Paragraph 308.1 applies in its entirety with the following exceptions: (a) Of the methods listed in para. 304.3.1(a), the one M308.2 Specific Requirements for Metallic Flanges in subpara. (3) may be used only if those in (1) and (2) are unavailable. Paragraph 308.2.4 does not apply [see para.M300(e)]. The following shall not be used: (b) Of the branch connections described in paras. 304.3.2(b) and (c),those having threaded outlets (a) single-welded slip flanges are permitted only in accordance with para. M314 and (b) expanded-joint flanges those having socket welding outlets are permitted only (c) slip-on flanges used as lapped flanges unless the in accordance with para M311.2. requirements in para. 308.2.1(c) are met (d) threaded metallic flanges,except those employing M306.6 Closures lens rings or similar gaskets and those used in lined The following requirements do not apply to blind pipe where the liner extends over the gasket face flanges or to fittings conforming to para. M306.1. Of M308.3 Flange Facings the closures described in para. 304.4, flat closures in accordance with the BPV Code,Section VIII,Division 1, Paragraph 308.3 applies in its entirety. UG-34 and UW-13,and conical closures without transi- tion knuckles [UG-32(g) and UG-33(f)], may be used M308.4 Gaskets only if others are not available. The requirements in Paragraph 308.4 applies in its entirety.