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製閥產業低逸散性研發與驗證技術研討會
冷凍閥測試法規BS 6364介紹與實務探討
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財團法人 金屬工業研究發展中心
區域研發服務處 北區技術開發與檢測組
曾博義
Tel : (02) 27013181-506
E-Mail : [email protected]
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中 華 民 國 98 年
11 月
10
日
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 startup 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, when
applied at the rim of the handwheel or lever, shall not exceed 350 N, except for valve seating and
unseating 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 testing
6.1 Examination of welds. Butt welded joints on fabricated sections of valves shall be fully
radiographed 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)
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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 extension
f) 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
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