Hydrotest Pressure
/glossary/hydrotest-pressureWater pressure test applied to verify pipe integrity and leak-tightness before dispatch.
In detail
Hydrotest Pressure is the internal water pressure applied to pipes during manufacturing to verify weld integrity, wall thickness adequacy, and leak-tightness. Standard hydrotest pressures are calculated as 2× design pressure or per formula (2×S×t)/OD where S is allowable stress and t is wall thickness. IS 1239 specifies minimum 50 bar for light class and 75 bar for medium class. Failed pipes show visible leakage or permanent deformation and are rejected. Hydrotest certificates are recorded on the MTC.
Where you'll meet this in procurement
You will meet Hydrotest Pressure on size charts, mill quotes, and fitment checks. Cross-check Hydrotest Pressure against OD, wall thickness or schedule, length, and end finish so the delivered pipe matches flanges, fittings, and pressure duty—not just a familiar nominal label.