When the line pressure to atmospheric pressure, 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。
If the ball within the cylinder sediment, and welding slags sundry total volume in not more than 5 litre, pigging qualified.
若收球筒内泥沙、焊渣等杂物总体积不超过5升，清管合格。
If the ball within the cylinder sediment, and welding slags sundry total volume in not more than 5 litre, pigging qualified.
若收球筒内泥沙、焊渣等杂物总体积不超过5升，清管合格。
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