When the line pressure to atmosphericpressure, open the ball tube, check pigging or caliper effect.
当管线内压力降到大气压力时，打开收球筒，检查清管或测径效果。
2
The violent effect of such an explosion, consisting of a wave of increased atmosphericpressure followed immediately by a wave of decreased pressure.
震动爆炸引起的强烈效果，包括一股被升高的气压，紧接一股低气压。
3
It is revealed by a great amount of test and research work that there is a significant effect of atmospheric temperature and atmospheric pressure on Diesel engine smoke emission.