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Leakage standard

GB/T4213.92
leaking grade test medium test pressure maximum seat leaking volume1/h
decided by customer and manufacture
water, air, nitrogen A 5×10-3× rated capacity
10-3× rated capacity
water A or B 10-4× rated capacity
air, nitrogen A
Ⅳ-S1 water A or B 5×10-4× rated capacity
air, nitrogen A
Ⅳ-S2 air, nitrogen A 2×10-4×△P×D
V water B 1.8×10-7×△P×D
VI air, nitrogen A 3×10-3×△P(Renewal table leaking volume)
Renewal table
seat diameter 20 25 40 50 65 80 100 150 200 250 300 350 400
leakage ml/min 0.1 0.15 0.3 0.45 0.6 0.9 1.7 4.0 6.75 11.1 16.0 21.6 28.4
bubble number /min 1 2 3 4 6 11 27 45

Note: 1. Every minute bubble numbers is used outside diameter 6mm, wall thickness 1mm tubes vertical submerged underwater 5 ~ 10mm depth conditions to measure, the pipe surface should be smooth.
2. If the seat diameter and listed value differ aboveo 2mm, leaking coefficient can be assumed leakage and seat diameter is directly proportional to the situation through internal extrapolation to obtain.

ANSI B16.104-197
leaking grade maximum allowed leakage test medium test pressure
0.5%Cv 10~52℃ air or water    
maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one
0.1%Cv 10~52℃ air or water     
maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one
0.01%Cv 10~52℃ air or water     
maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one
V when each inch nominal diamter and pound/inch 2 pressure differential, allowed 0.0005 ml/min leaking water.
10~52℃ water    
△Pmaximum working pressure differential △P
Nominal diameter ml/min Bubble number /min 10~52℃ air or nitrogen     
maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one
in mm
1 25 0.15 1
1.5 38 0.30 2
2 51 0.45 3
2.5 64 0.60 4
3 76 0.90 6
4 102 1.70 11
6 152 4.00 27
8 203 6.75 45
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