冷凍閥測試法規冷凍閥測試法規 BS 6364BS 6364 介紹與實務探討介紹與實務探討

中 華 民 國 98 年 11 月 10 日

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製閥產業低逸散性研發與驗證技術研討會 製閥產業低逸散性研發與驗證技術研討會

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大綱

Section 1 、 Gernal 概述Section 2 、 Design 設計Section 3 、 Testing 試驗Appendix A 、 Cryogenic test 低溫試驗Appendix B 、 Preferred materials 適用材料Appendix C 、 Information to be supplied by purchaser

買方應提供之資訊

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Section 1 Scope 概述

The size range covered by this standard is DN 15 to a maximum nominal size appropriate to the above product standards, in the temperature range – 50 °C to – 196 °C, yet capable of operation at ambient conditions to allow for start-up and run-down.

NOTE 1 For marine applications where design temperatures are below –

165 °C attention is drawn to the need to check requirements with the relevant Statutory Authority.

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Section 2 Design 設計 4.1 Valves shall be supplied with extended

bonnets/glands (see Figure 1). The length of the extension shall be sufficient to maintain the stem packing at a temperature high enough to permit operation within the normal temperature range of the packing material.

MSS SP 134:

Cold Box :An enclosure that insulates a set of equipment from the environment without the need for insulation of the individual components inside the cold box. (cryogenic liquid/vapor service)

Cold Box Extension :A valve body/bonnet extension section that removes the operating

mechanism of the valve outside the cold box and is required to be longer than a non-cold box extension. (cryogenic gas or liquid service )

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Section 2 Design 設計4.2 Valves on gas service shall be capable of operation

with the valve stem at or above the horizontal position.

4.3 Valves in liquid service other than cold box applications shall be capable of operation with the

valve stem at or above 45° above the horizontal

position.( 冷箱以外者 )

4.4 For cold box applications, valves shall be suitable for use with the valve stem at or above 15° above the horizontal position . ( 冷箱用 )

4.5 For applications other than cold box applications

the minimum gland extension length shall be 250 mm.( 冷箱以外者 )

4.6 Valves shall be designed to relieve pressures

above normal working pressure that may build up in

trapped cavities due to thermal expansion or

evaporation of liquid.

( 應設計成可洩放高於閥門工作壓力之壓力值 )

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Section 2 Design 設計BS 6364

MSS SP-134

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Section 2 Design 設計4.7 Where valves, by design, are unidirectional in operation, the flow direction shall be clearly indicated either on and integral with the body of the valve or on a plate securely attached to the body of the valve.( 單方向之閥門應予以標示流向 )

4.8 Valve bonnets shall be bolted, welded or union type. Union type bonnets shall only be used on valves DN 50 and below, or for marine applications DN 40 and below, and the union nut shall be locked to the body. The use of screwed bonnets shall not be permitted.Bonnet 之鎖固 : 螺栓連接 , 焊接或 union( 活接頭 ) 方式 , 而 union 只適用於 DN 50 以下之閥門或用於 DN 40 以下之船舶用閥門 , 且活接頭螺母應鎖至閥體上 , 不得以螺牙方式進行連接 .

4.14 The maximum force required to operate the valves manually under service conditions, whenapplied at the rim of the handwheel or lever, shall not exceed 350 N, except for valve seating andunseating only, when it shall be permissible for this value to be increased to 500 N. Where reduction gearing is provided, it shall be suitable for operation at ambient temperature.在工作條件下 , 扭力不得超過 350N, 於閥門開啟 / 關閉之扭力不得超過 500N.

4.15 Valves for flammable service shall be designed to ensure electrical continuity to prevent build-up of static electricity.( 防靜電設計 )

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Section 2 Design 設計5 Materials: Appendix B gives the preferred austenitic steels and non-ferrous materials that may be used.

5.1 Bolting materials shall be selected from those listed in BS 4882:1990 Specification for bolting for flanges and pressure containing purposes

5.2 Valves shall have metal/metal or soft seats (see Appendix C type of valve seat). Soft seats shall be backed by a secondary metal seat. Virgin PTFE shall be supported in such a way as to prevent cold flow.

6 Non-destructive testing6.1 Examination of welds. Butt welded joints on fabricated sections of valves shall be fullyradiographed and shall comply with 5.7 of BS 5500:1988. ( 對焊接頭應符合 BS 5500 第 5.7 節規定 )6.2 Examination of castings : 應符合 BS 5988 之規定

7 Repair of castings 鑄件之補焊Weld repair of castings shall be to the standards of acceptability in accordance with the quality level specified in BS 5998.

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Section 3 Testing 試驗8.1 Shell strength test 依第 1 節所示之對應標準進行水壓試驗 , 氣壓試驗時應以最大工作壓力進行 . 閘閥 , 碟閥等應於全開位置進行試驗 , 球閥則於半開位置進行試驗 .

8.2 Shell leak test. During the test duration specified in Appendix B of BS 6755-1:1986, there shall be no visible leakage.殼體應以空氣或氮氣於額定壓力下進行試驗 , 不得有可見之洩漏 .

8.3 Seat leak test 以空氣或氮氣在額定壓力下進行試驗 , 其中球閥試驗壓力則為 6.9 bar.金屬密封閥門 : 最大漏率為 0.3 mm3/s x DN 軟墊閥門 : 不得有可見之洩漏 .

8.4 Cryogenic prototype testing. When tested as described in Appendix A, valves shall satisfy all the requirements of the test as given in that appendix. Valves intended for marine applications shall be subjected to the tests described in Appendix A.船舶用 : 需進行試驗 . 其他用途 : 則依買方之要求決定是否要進行此項試驗 .

9 Marking : 應標示符合之標準編號及適用之溫度 , 如 BS 6364:1984 – 196 °C.

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Appendix A Cryogenic test 低溫試驗A.3.1 Handwheel operated valves: gate, globe, ball and butterfly valves.A.3.2 Check valve

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Appendix A Cryogenic test 低溫試驗A.3.1 Handwheel operated valves: gate, globe, ball and butterfly valves.

1. 使測試溫度降至 -196 °C.

2. 開關閥門 20 次並測量首次及最後之扭力 .

3. 壓力增量試驗

4. 記錄各階段之漏率 The leakage rate measured at the flowmeter shall not exceed 100 mm3/s ×° DN.

5. 將閥門開至全開 , 關閉後端針閥 , 壓力維持在額定測試壓力 15 分鐘 , 觀察 body/bonnet 接點部份有無外漏 .( 不允許有外漏 )

1. 使測試溫度降至 -196 °C.

2. 開關閥門 20 次並測量首次及最後之扭力 .

3. 壓力增量試驗

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Appendix B Preferred material

鑄鋼材料應依 BS 131-2 進行 Charpy V-notch 試驗 .

BS 標準之材料應符合 BS 1504及 BS 3100 關於衝擊強度之要求 .

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Appendix C Information to be supplied by purchaser

a) Number of relevant valve product standard.b) Nominal size (DN).c) Nominal pressure (PN).d) Whether valves are for cold-box application (see 4.4).e) Any special lengths of gland extensionf) Any particular method of pressure relief (see 4.6).g) Any special requirements for bolted bonnet gasket material (see 4.8).h) Whether valves are required for flammable service (see 4.15).i) Any special requirements for gland packing (see clause 5).j) Type of valve seat (see 5.2).k) Whether weld ends are to be radiographed (see 6.2).l) Any special requirements for the degreasing medium (see 8.1.3).m) Whether cryogenic tests are required (see 8.4).n) Whether Charpy V-notch impact testing is required on cast steels (see Table 2).

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Thank you for your attention