MVME177PA-65SE備件庫存
低壓關(guān)閉試驗(yàn)6.4.1低壓關(guān)閉試驗(yàn)應(yīng)在閥座密封表面界面清潔且無油、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（如潤滑旋塞閥）。6.4.2當(dāng)觀察到蓋有水的關(guān)閉裝置（閥盤、閥座和閥座環(huán)）出現(xiàn)氣泡時(shí)，應(yīng)檢測閥座密封表面界面、閥座環(huán)后面或通過閥門開口側(cè)閥盤的任何泄漏。表5-所需試驗(yàn)壓力閥門尺寸的持續(xù)時(shí)間最小試驗(yàn)持續(xù)時(shí)間（秒）DN NPS外殼后座（對于具有后座功能的閥門）關(guān)閉止回閥（API 594）關(guān)閉其他閥門≤ 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(yàn)持續(xù)時(shí)間是閥門完全準(zhǔn)備好并處于全壓狀態(tài)后的檢查時(shí)間。版權(quán)所有美國石油學(xué)會(huì)由IHS根據(jù)API許可證提供，許可證持有人=阿爾伯塔大學(xué)/5966844001，用戶=sam，albert未經(jīng)IHS許可不得復(fù)制或聯(lián)網(wǎng)，不得轉(zhuǎn)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，則閥門制造商可以證明并驗(yàn)證該程序產(chǎn)生的結(jié)果與本標(biāo)準(zhǔn)的要求相當(dāng)，并且該裝置已通過買方和制造商之間的協(xié)議驗(yàn)收。
當(dāng)用于大于DN 50（NPS 2）的閥門時(shí)，只有在買方同意的情況下，才可接受起泡器試驗(yàn)。當(dāng)使用體積裝置（起泡器）測量泄漏時(shí)，在通過試驗(yàn)管的流量建立并穩(wěn)定之前，不得開始試驗(yàn)持續(xù)時(shí)間。應(yīng)對裝置進(jìn)行校準(zhǔn)，以產(chǎn)生相當(dāng)于表6中所列單位/分鐘的結(jié)果。應(yīng)使用與生產(chǎn)試驗(yàn)相同的試驗(yàn)流體和溫度對體積裝置進(jìn)行校準(zhǔn)。表6-關(guān)閉試驗(yàn)的最大允許泄漏率閥門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(yàn)a（滴/分鐘）氣體試驗(yàn)（氣泡/分鐘）液體試驗(yàn)（cc/min）氣體試驗(yàn)a（m3/h）氣體試驗(yàn)b（ft3/h）對于液體試驗(yàn)，1mL被認(rèn)為相當(dāng)于16滴。b在規(guī)定的最小試驗(yàn)持續(xù)時(shí)間內(nèi)，應(yīng)無泄漏（見表5）。對于液體試驗(yàn)，0滴意味著在最小規(guī)定試驗(yàn)持續(xù)時(shí)間內(nèi)無可見泄漏。對于氣體試驗(yàn)，0個(gè)氣泡意味著每最小規(guī)定試驗(yàn)持續(xù)時(shí)間少于1個(gè)氣泡。版權(quán)所有美國石油學(xué)會(huì)由IHS根據(jù)API許可證提供，許可證持有人=阿爾伯塔大學(xué)/5966844001，用戶=sam，albert未經(jīng)IHS許可，不得復(fù)制或聯(lián)網(wǎng)，不得轉(zhuǎn)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(yīng)使用一種測試閥座泄漏的方法，該方法應(yīng)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(qū)域之間的測試壓力（如適用）。這將確保在試驗(yàn)期間，由于這些容積的逐漸填充，閥座泄漏不會(huì)逃過檢測。
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.
