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测试介质：
Test Medium: |
丙烷，压力为115 psi，常温
Propane at 115 psi, ambient temperature |
测量仪器：
Instrument: |
有机蒸汽分析仪
OVA-108，范围：1-10,000 ppm
Organic vapor analyzer
OVA-108, range 1–10,000 ppm |
阀门种类：
Valve Type: |
闸阀，150磅级，API 600
Gate, Class 150, API 600 |
通径：
Sizes: |
DN80, DN150, DN300
3", 6", 12" (80, 150, 300mm) |
填料：
Packing: |
石墨
Graphite |
密封圈：
Gasket: |
带石墨填料的波纹钢板
Corrugated steel with graphite filler |
阀内件：
Trim: |
楔板：13 CR
阀座：钨铬钴合金
Wedge: 13 CR
Seat: Stellite |
数量：
Quantity: |
DN80 - 一个阀门
DN150 - 四个阀门
DN300 - 一个阀门
3" (80 mm)– one valve
6" (150 mm) – four valves
12" (300 mm)– one valve |
与API 598测试比较
TEST COMPARISON TO API 598 TEST
- API 598测试标准要求没有肉眼可见的外泄漏（密封垫，填料腔和铸件）。有机蒸汽分析仪测试泄漏精确度为百万分之一（ppm）。根据API
598的标准，所谓“肉眼可见的泄漏”是指每分钟泄漏一滴液体，我们估计相当于2,400 ppm的气体。API 598测试并不启用开关循环测试，而我们的研究测试过程中，阀门开关循环次数在100次到5000次之间。
API 598 test standard requires no visible external
leakage (gasket, packing chamber and casting). The organic vapor analyzer
measures leakage in parts per million (ppm). “Visible leakage” in API
598 is one drop of liquid per minute which we estimate is equivalent
to about 2,400 ppm of gas. The API 598 test does not invoke cycling
while we have cycled valves between 100 and 5000 cycles in our research
testing.
- 在低放射（排放）应用寿命中，关键因素包括压力-温度瞬变的严酷性，开关循环次数和洁净度。在大量的循环测试期间，我们发现泄漏通道出现并扩大后，通过重新紧固压盖螺栓，可以减少或消除泄漏。例如，经过350次开关循环测试后出现的150
ppm的泄漏，通过重新紧固压盖螺栓，泄漏能够减少至零。
Critical factors in low emission service life
include severity of pressure-temperature transients, number of cycles
and cleanliness. During extensive cycling tests it was found that after
leak paths developed, leakage could be reduced or eliminated by retightening
gland bolts. For example a 150 ppm leak that developed after 350 cycles
could be reduced to zero after retightening gland bolts.
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