Pipe Pressure Rating Calculator

Inputs

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Actual outside diameter from schedule, SDR table, tube drawing or manufacturer data.
in
Actual wall thickness. Corrosion, erosion, thread depth, mill tolerance and code allowances are not subtracted automatically.
in
Allowable hoop stress before joint efficiency, derating and design factor are applied.
ksi
Efficiency factor for seam, weld or joint quality. Use 1.0 for seamless or when already included in allowable stress.
Multiplier for temperature, material or service derating. Use 1.0 if already included in allowable stress.
Divides the adjusted allowable stress before calculating pressure rating.
Pressure compared against the calculated rating and used to back-solve required wall thickness.
psi

Results

Default result
Edit inputs
Pressure rating screen(P_rating)
1,729psi
Pass

2 x adjusted allowable stress x wall / OD

Also computed

Required wall thickness(t_req)Pass0.013359in

wall thickness needed for the entered design pressure

Wall margin(t_margin)Pass0.1406in

Pressure utilization(U)Pass8.675%

design pressure divided by calculated rating

Hoop stress at design pressure(sigma_h)1.157ksi

Adjusted allowable stress(S_adj)13.33ksi

S x E x derating / design factor

Calculated pipe ID(ID)2.067in

Pipe pressure rating previewPipe pressure rating previewBarlow thin-wall pressure screen from actual OD and wall thickness.wall thicknessutilization8.7%Pressure rating1729 psiRequired wall0.013 inOD/t15.4
Method notes 4 notes
  • Barlow pressure rating screen: P = 2 x S_adj x t / OD.
  • Required wall screen: t_req = P_design x OD / (2 x S_adj).
  • S_adj = allowable hoop stress x joint efficiency x derating factor / design factor.
  • This does not subtract corrosion allowance, mill tolerance, thread/groove allowance or local code allowances. It also does not rate fittings, flanges, valves, joints, welds, fatigue, external pressure, buckling, plastic-pipe long-term hydrostatic strength or temperature-specific manufacturer limits.

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