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whm0827铜虫 (小有名气)
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[求助]
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| The Pressure/Vacuum test is performed prior to any preconditioning of the fuel tank. Determine the fuel tank system’s design pressure and vacuum limits under normal operating conditions considering the influence of any associated pressure/vacuum relief components. Pressurize the empty tank, sealed with the OEM fuel cap, or a modified OEM fuel cap as required, to within 10% of the system’s normal high pressure operating limit and then evacuate to within 10% of the system’s normal vacuum operating limit. If the fuel tank has no features that would cause positive or negative pressures during normal operation, then pressure/vacuum cycling is not required. The tank pressure/vacuum cycling shall be performed in a 49o C+/- 3o C ambient with compressed air of no less than 21o C. Repeat the pressure/vacuum process until the tank has been subjected to not less than 1000 cycles in 8 hours +/- 1 hour. |
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reko34
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whm0827: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-04-18 12:58:18
whm0827: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-04-18 12:58:18
| 压力/真空试验在油箱预调质前进行。结合所有相关的压力/真空卸压部件，确定油箱系统在正常工作条件下的设计压力和真空度极限。用OEM（原件制造商）油盖或是根据具体要求修改过的OEM油盖密封，对空油箱加压至系统正常高压工作极限的10%以内，然后降压至系统正常真空度工作极限的10%以内。如果油箱没有表现出在正常工作中造成正压或负压的现象，不要求压力/真空循环。进行油箱压力/真空循环时，温度为49°C+/-3°C，压缩空气温度不低于21°C。油箱在8小时+/-1小时内重复不少于1000个压力/真空循环。 |
2楼2014-04-18 11:22:22
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