Pressure resistance and bursting pressure of copper tubes and heat exchangers
1. Working pressure of commonly used refrigerants under standard working conditions
2. Working pressure of copper tubes
Non-destructive testing methods: eddy current testing, water pressure test, air pressure test.
Water pressure test calculation formula: P=2st/D-0.8t
P-static pressure of test water Mpat-tube wall thickness, mmD-tube outer diameter, mms-allowable stress of material, MpaTp2 The allowable stress of copper tubes is specified as s=41.2Mpa (6000psi)
Several copper tube test pressures
3. Burst pressure of copper tubes
Calculated and measured values of burst pressure of several air conditioning refrigeration copper tubes
4. Working pressure and burst pressure of heat exchangers
Heat exchanger pressure burst test data
5. Factors affecting heat exchanger pressure
(1) Factors that increase burst pressure: cold hardening of bending and expansion tubes; strengthening of wrapped aluminum fins
(2) Factors that reduce bursting pressure: heat effect of brazing; poor assembly of brazed joints.
