Hydrostatic test time frame

cckla,
There is no such thing as a "International Standard" for conducting a Hydrotest.
However is some common agreement on certain steps that should be taken:
- walk down the system to insure that all the flange bolts are tight
- Check all the valve packing bolts or gland nuts
- open all the high point vents
- close all the drains
- add the test water
- as you are filling, close the vent valves starting with lower ones first and working up to the highest
- Bring the pressure up in steps to hold points
- at each hold point (pressure) walk the system to check for leaks (Flanges or Valves)
- When the final "Test Pressure" is reached hold for a minimum of 10 minutes (for short close configurations)
- For longer systems or configurations hold the pressure until the whole system has been checked
- Continue to hold until the Client representative or designated inspector signs off on the test
- After the approval open all the vent valves
- Connect temporary drain pipes or hoses to designated drain valves to control water recovery if required
- Drain the system