API 16C Hydrostatic Test Pressure Calculator

API Spec 16C requires hydrostatic testing at 1.5× rated working pressure before shipment.¹ Enter your assembly’s rated working pressure to see the required test pressure.

When an assembly combines components at different working-pressure ratings, the lowest-rated component governs the assembly’s overall pressure class — this calculator assumes a single uniform rating. For mixed-rating assemblies or PSL classification, request a quote and we’ll confirm the governing rating.

1. API Spec 16C — Choke and Kill Systems, American Petroleum Institute.