Please consider the following equation for hydrostatic pressure test:
P_{e }= 9.806(P_{w})(X) (Metric units)
OR
P_{e }= (P_{w}/144)(X) (Customary units)
Where:
P_{e }= External hydrostatic pressure, Pa (psi)
P_{w} = Density of external fluid, kg/m^{3} (lb/ft^{3})
X = Minimum pipeline depth below lowest astronomical tide (LAT), m (ft)
The minimum Test Pressure (P_{t}) should be determined from:
P_{t} = k(MAOP)
Where:
MAOP is Maximum Allowable Operating Pressure
k = 1.25, 1.40 or 1.50 depending upon the type of commissioning test and the piping code used
Note: Refer to EPT 09-T-05 for the applicable piping code. The MAOP should not exceed the following:
- The established pressure rating of the weakest component, including pipe
- 80 percent of the Test Pressure (P_{t})