PSI to MPa Converter

Converting US hydraulic system specifications (rated in PSI) to SI units (MPa) for international equipment specifications.

Material stress analysis: yield and tensile strengths are typically reported in MPa.

Pressure vessel and piping code compliance across ASME (psi) and EN (MPa) standards.

In aerospace and aircraft hydraulic system design, the standard working pressure is 3,000 psi (20.68 MPa) per MIL-H-5606 / MIL-PRF-83282 for military aircraft and 3,000 psi (20.68 MPa) per AS1241 for commercial aircraft, with newer Boeing 787 and Airbus A380 systems using 5,000 psi (34.47 MPa) for reduced weight and faster actuation.

Component ratings (pumps, valves, actuators, reservoirs, accumulators) are universally in psi for US and Boeing documentation and in MPa for Airbus and most international documentation, with the conversion required for cross-fleet maintenance, MRO operations, and parts inventory.

The offshore oil and gas industry specifies wellhead and downhole equipment pressures in psi (5,000 psi, 10,000 psi, 15,000 psi are standard API 6A working pressure ratings, equivalent to 34.5, 68.9, 103.4 MPa), while the mud pumps, BOPs, and associated equipment are dual-rated in psi and MPa on the nameplate — the conversion is required for international drilling operations and for the well control equipment certification.

Pressure vessel hydrostatic test pressures in the international EPC industry are specified in MPa (a typical test pressure of 1.5× design pressure for a 5 MPa design vessel is 7.5 MPa) and in psi for US projects (a 1.5× test for a 720 psi design is 1,080 psi), with the conversion applied to the test certificate and the inspector's documentation.

Hydrogen pressure vessel certification for fuel cell vehicles per SAE J2579 and the Global Technical Regulation (GTR) on hydrogen specifies working pressures in MPa (35 MPa for 350 bar Type III tanks, 70 MPa for 700 bar Type IV tanks), with the conversion to psi required for US FCEV servicing equipment and for the US DOE hydrogen program documentation.

Compressed natural gas (CNG) and hydrogen tube trailer transportation per ISO 11119 and ASME BPVC Section X specifies working pressure in MPa (typically 20 MPa for CNG, 45 or 70 MPa for hydrogen), with the conversion to psi for US Department of Transportation (DOT) specifications and for the FMVSS 304 hydrogen vehicle standard.

Hydraulic bolt tensioning and hydraulic nut equipment for high-pressure flange bolting (offshore wind turbine foundations, large diameter process piping, nuclear primary loop) is specified in MPa for European equipment (ENERPAC, Holmatra, Powermax) and in psi for US equipment, with the conversion required for equipment specification and operating procedure documentation.