MVME177PA-65SE備件庫存
低壓關(guān)閉試驗6.4.1低壓關(guān)閉試驗應在閥座密封表面界面清潔且無(wú)油、油脂和密封劑的情況下進(jìn)行。如有必要防止磨損，密封表面可涂上一層不比煤油重的油膜。該要求不適用于使用潤滑劑作為主要密封件的閥門(mén)（如潤滑旋塞閥）。6.4.2當觀(guān)察到蓋有水的關(guān)閉裝置（閥盤(pán)、閥座和閥座環(huán)）出現氣泡時(shí)，應檢測閥座密封表面界面、閥座環(huán)后面或通過(guò)閥門(mén)開(kāi)口側閥盤(pán)的任何泄漏。表5-所需試驗壓力閥門(mén)尺寸的持續時(shí)間最小試驗持續時(shí)間（秒）DN NPS外殼后座（對于具有后座功能的閥門(mén)）關(guān)閉止回閥（API 594）關(guān)閉其他閥門(mén)≤ 50≤ （2） 15 15 60 15 65至150（2 1/2至6）60 60 60 200至300（8至12）120 60 120≥ 350≥ （14） 300 60 120 120 a試驗持續時(shí)間是閥門(mén)完全準備好并處于全壓狀態(tài)后的檢查時(shí)間。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，2013年6月28日16:13:35 MDT---``，，，，```，如果可檢測泄漏率等于表6中給出的泄漏率，則閥門(mén)制造商可以證明并驗證該程序產(chǎn)生的結果與本標準的要求相當，并且該裝置已通過(guò)買(mǎi)方和制造商之間的協(xié)議驗收。
當用于大于DN 50（NPS 2）的閥門(mén)時(shí)，只有在買(mǎi)方同意的情況下，才可接受起泡器試驗。當使用體積裝置（起泡器）測量泄漏時(shí)，在通過(guò)試驗管的流量建立并穩定之前，不得開(kāi)始試驗持續時(shí)間。應對裝置進(jìn)行校準，以產(chǎn)生相當于表6中所列單位/分鐘的結果。應使用與生產(chǎn)試驗相同的試驗流體和溫度對體積裝置進(jìn)行校準。表6-關(guān)閉試驗的最大允許泄漏率閥門(mén)尺寸所有彈性閥座閥金屬閥座閥（止回閥除外）DN（mm）NPS（in.）液體試驗a（滴/分鐘）氣體試驗（氣泡/分鐘）液體試驗（cc/min）氣體試驗a（m3/h）氣體試驗b（ft3/h）對于液體試驗，1mL被認為相當于16滴。b在規定的最小試驗持續時(shí)間內，應無(wú)泄漏（見(jiàn)表5）。對于液體試驗，0滴意味著(zhù)在最小規定試驗持續時(shí)間內無(wú)可見(jiàn)泄漏。對于氣體試驗，0個(gè)氣泡意味著(zhù)每最小規定試驗持續時(shí)間少于1個(gè)氣泡。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，2013年6月28日16:13:35 MDT VALVE INSPECTION AND TESTING 11 6.4.3關(guān)閉測試閘閥、旋塞閥和球閥時(shí)，應使用一種測試閥座泄漏的方法，該方法應使用測試流體填充閥體空腔并將其完全加壓至閥座和閥蓋區域之間的測試壓力（如適用）。這將確保在試驗期間，由于這些容積的逐漸填充，閥座泄漏不會(huì )逃過(guò)檢測。
Low pressure closing test 6.4.1 The low pressure closing test shall be conducted when the sealing surface interface of the valve seat is clean and free of oil, grease and sealant. If necessary, the sealing surface can be coated with an oil film not heavier than kerosene. This requirement does not apply to valves that use lubricant as the primary seal (e.g., lubricated plug valves). 6.4.2 When bubbles are observed in the closing device (valve disc, valve seat and valve seat ring) covered with water, any leakage at the sealing surface interface of the valve seat, behind the valve seat ring or through the valve disc at the opening side of the valve shall be detected. Table 5 - Duration of required test pressure Valve size Minimum test duration (s) DN NPS shell backseat (for valves with backseat function) Close check valve (API 594) Close other valves ≤ 50 ≤ (2) 15 15 60 15 65 to 150 (2 1/2 to 6) 60 60 200 to 300 (8 to 12) 120 60 120 ≥ 350 ≥ (14) 300 60 120 a Test duration is the inspection time after the valve is fully prepared and in full pressure state. Copyright American Petroleum Institute is provided by IHS according to the API license. The licensee=University of Alberta/5966844001, the user=sam, albert, without permission from IHS, shall not be copied or networked, and shall not be resold. On June 28, 2013, 16:13:35 MDT -- ` `,,, ` `. If the detectable leakage rate is equal to the leakage rate given in Table 6, the valve manufacturer can prove and verify that the results generated by this procedure are equivalent to the requirements of this standard, And the device has passed the agreement acceptance between the buyer and the manufacturer.
When used for valves larger than DN 50 (NPS 2), the bubbler test can be accepted only with the consent of the Buyer. When a volumetric device (bubbler) is used to measure leakage, the test duration shall not commence until the flow through the test tube has been established and stabilized. The device shall be calibrated to produce a result equivalent to the units/minute listed in Table 6. The volumetric apparatus shall be calibrated using the same test fluid and temperature as the production test. Table 6 - Maximum allowable leakage rate for closing test Valve size All flexible seat valves Metal seat valves (except check valves) DN (mm) NPS (in.) Liquid test a (drop/minute) Gas test (bubble/minute) Liquid test (cc/min) Gas test a (m3/h) Gas test b (ft3/h) For liquid test, 1mL is considered to be equivalent to 16 drops. B There shall be no leakage within the specified minimum test duration (see Table 5). For liquid tests, 0 drop means no visible leakage for the minimum specified test duration. For gas tests, 0 bubble means less than 1 bubble per minimum specified test duration. Copyright American Petroleum Institute is provided by IHS according to API license. Licensee=University of Alberta/5966844001, user=sam, albert, without license from IHS, cannot be copied or networked, and cannot be resold. On June 28, 2013, 16:13:35 MDT VALVE INSPECTION AND TESTING 11 6.4.3 When closing test gate valves, plug valves, and ball valves, a method for testing seat leakage should be used, This method shall use the test fluid to fill the body cavity and fully pressurize it to the test pressure between the seat and bonnet area, as applicable. This will ensure that valve seat leakage will not escape detection due to gradual filling of these volumes during the test.
