MVME177PA-67SE備件庫存
制造商應證明閥桿密封件能夠保持至少等于38°C（100°F）閥門(mén)額定值的壓力，且無(wú)明顯泄漏。版權所有美國石油學(xué)會(huì )由IHS提供，經(jīng)API許可證持有人=阿爾伯塔大學(xué)/5966844001，用戶(hù)=sam，albert未經(jīng)IHS許可，不得復制或聯(lián)網(wǎng)，不得轉售，2013年6月28日16:13:35 MDT——閥門(mén)檢查和測試7 5.9.1.4對于帶有不可調節閥桿密封件（O形圈、固定單環(huán)等）的閥門(mén)，外殼試驗期間不允許出現肉眼可見(jiàn)的泄漏。5.9.1.5如果不允許目視檢測到泄漏，則以下定義適用：a）如果試驗流體為液體，則試驗閥的外表面應無(wú)明顯的滴落或潤濕跡象；b） 如果測試流體是空氣或惰性氣體，則建立的檢測方法不會(huì )顯示泄漏。5.9.2關(guān)閉5.9.2.1對于低壓關(guān)閉試驗和高壓關(guān)閉試驗，不允許通過(guò)閥盤(pán)、閥座環(huán)后面或軸封（具有該特征的閥門(mén)）出現泄漏的視覺(jué)證據，也不允許出現結構損壞?！緩椥蚤y座和密封件的塑性（永久）變形不視為結構損壞?！吭谠囼炂陂g，閥座密封表面界面處試驗流體的允許泄漏率，5.9.2.2非金屬（如陶瓷）閥座材料閥門(mén)關(guān)閉試驗的允許泄漏率應等于表6中規定的同等尺寸和類(lèi)型的金屬閥座閥門(mén)的泄漏率。
表3—外殼試驗壓力閥門(mén)類(lèi)型等級外殼試驗壓力（最?。┌捅韷喊?平方英寸表壓（psig）球墨鑄鐵34將螺紋端閥限制在2500級及以下。b根據ASME B16.34.c，對于800級閥門(mén)，殼體試驗壓力應為38°c（100°F）時(shí)額定壓力的1/2倍，四舍五入至下一個(gè)更高的bar（25 psig）（見(jiàn)API 602表2）。版權所有美國石油學(xué)會(huì )由IHS根據API許可證提供，許可證持有人=阿爾伯塔大學(xué)/5966844001，用戶(hù)=sam，albert未經(jīng)IHS許可，不得復制或聯(lián)網(wǎng)，不得轉售，8 API標準598 6壓力測試程序6.1一般6.1.1設計用于緊急或補充向閥座區域注入可注射密封劑的閥門(mén)應在注入系統為空且未使用的情況下進(jìn)行測試，但潤滑旋塞閥除外。6.1.2當液體用作試驗流體時(shí)，閥門(mén)在試驗過(guò)程中應基本上沒(méi)有截留空氣。6.1.3在檢查或壓力測試之前，不得在任何表面上涂敷可能掩蓋表面缺陷的所需保護涂層，如油漆。（用于保護閥門(mén)表面的磷化和類(lèi)似化學(xué)轉化工藝，即使在試驗前進(jìn)行，也可以接受，但前提是它們不會(huì )密封氣孔。）表4—其他試驗壓力試驗壓力d巴表壓磅/平方英寸表壓（psig）閥門(mén)（蝶閥和止回閥除外）高壓關(guān)閉和bb低壓關(guān)閉和4至760至100蝶閥高壓關(guān)閉c c低壓關(guān)閉4至7 60至100止回閥高壓關(guān)閉125級（鑄鐵）DN 50至300（NPS 2至12）14 200 DN 350至1200（NPS 14至48）
The manufacturer shall demonstrate that the stem seal is capable of maintaining a pressure at least equal to the valve rating of 38 ° C (100 ° F) without significant leakage. Copyright American Petroleum Institute is provided by IHS. API licensees=University of Alberta/5966844001, users=sam, albert, without permission from IHS, are not allowed to copy, network or resell. On June 28, 2013, 16:13:35 MDT - Valve Inspection and Testing 7 5.9.1.4 For valves with non adjustable stem seals (O-ring, fixed single ring, etc.), no visible leakage is allowed during shell test. 5.9.1.5 If visual detection of leakage is not allowed, the following definitions apply: a) If the test fluid is liquid, the external surface of the test valve shall have no obvious signs of dripping or wetting; b) If the test fluid is air or inert gas, the established test method will not show leakage. 5.9.2 Closing 5.9.2.1 For low pressure closing test and high pressure closing test, no visual evidence of leakage through valve disc, back of valve seat ring or shaft seal (valve with this feature) is allowed, and no structural damage is allowed. [Plastic (permanent) deformation of resilient seats and seals shall not be considered as structural damage.] During the test, the allowable leakage rate of the test fluid at the interface of the sealing surface of the valve seat, 5.9.2.2 The allowable leakage rate of the valve closure test for non-metallic (such as ceramic) seat materials shall be equal to the leakage rate of metal seat valves of the same size and type specified in Table 6.
Table 3 - Case Test Pressure Valve Type Class Case Test Pressure (minimum) bar gauge pounds per square inch gauge (psig) Ductile Iron 34 limits threaded end valves to Class 2500 and below. B According to ASME B16.34. c, for Class 800 valves, the shell test pressure shall be 1/2 times the rated pressure at 38 ° c (100 ° F), rounded to the next higher bar (25 psig) (see API 602 Table 2). Copyright American Petroleum Institute is provided by IHS according to API license, licensee=University of Alberta/5,966,844,001, user=sam, albert, without permission of IHS, shall not be copied or networked, and shall not be resold. 8 API standard 598 6 Pressure test procedure 6.1 General 6.1.1 Valves designed for emergency or supplementary injection of injectable sealant into the valve seat area shall be tested when the injection system is empty and unused, Except for lubricating plug valve. 6.1.2 When the liquid is used as the test fluid, the valve shall basically not retain air during the test. 6.1.3 Before inspection or pressure test, the required protective coating, such as paint, which may cover surface defects, shall not be applied on any surface. (Phosphating and similar chemical conversion processes used to protect valve surfaces, even before testing, are acceptable, provided they do not seal pores.) Table 4 - Other test pressures Test pressure d bar gauge pounds per square inch gauge (psig) Valves (except butterfly and check valves) High pressure closure and bb Low pressure closure and 4 to 760 to 100 butterfly valves High pressure closure c Low pressure closure 4 to 7 60 to 100 check valves High pressure closure Class 125 (cast iron) DN 50 to 300 (NPS 2 to 12) 14 200 DN 350 to 1200 (NPS 14 to 48)
