Page 403 - Catalog4400.pdf

E-45 Hose Products Division
Parker Hannifn Corporation
Wickliffe, Ohio
www.parkerhose.com
Technical Catalog 4400 US
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PSI and MPa or N/mm2 Conversions C onversions
Pounds per Square Inch (abbrev. PSI) - A basic unit
of pressure or tension measurement in the Imperial or
English System of Weights and Measures.
1 psi = .006895 MPa,
1000 psi = 1 ksi
MegaPascal (abbrev. MPa) - A basic unit of pressure
or tension measurement in the International System of
Weights and
Measures.
1 MPa = 145 psi,
1 MPa = 1 N/mm2.
For oil feld applications, units of measurement smaller
than 1 psi usually have little meaning. Units of MPa
may often appear with a decimal.
Example: 1000 psi = 6.895 MPa.
1 MegaPascal (MPa) = 1 Newton per Square Millimeter
(N/mm2) = 145 Pounds per Square Inch (psi).
Psi, Ksi, MPa, and N/mm2 all express force measure-
ment, either pressure (as fuid pressure) or load (as
tension). All of these temrs may appear as pressure
ratings or test pressures, and tensile or yield require-
ments or test results.
API Spec 6A specifes equipment
pressure ratings in both PSI, and MPa as:
2,000 psi = 13.8 MPa = 138 bar
3,000 psi = 20.7 MPa = 207 bar
5,000 psi = 34.5 MPa = 345 bar
10,000 psi = 69.0 MPa = 690 bar
15,000 psi = 103.5 MPa = 1,035 bar
20,000 psi = 138.0 MPa = 1,380 bar
Bar pressure provided for information only.
To express PSI pressures in bars, convert PSI to
MPa and move the decimal in the MPa value 1 space
to the right, e.g. 5000 PSI = 34.5 MPa = 345 bar.
API Spec 6A specifes
material property requirements* as:
Material
Designation
Yield Tensile
PSI MPa PSI MPa
36 K 36,000 248 70,000 483
45 K 45,000 310 70,000 483
60 K 60,000 414 85,000 586
75 K 75,000 517 95,000 655
*For Elongation and Reduction of Area, see API
Spec 6A. The values specifed for these require-
ments do not require conversion.