Liquid Pipeline & Terminal Piping (ASME B31.4)

Liquid pipelines and the piping of tank farms, pump stations and terminals to ASME B31.4: wall thickness and maximum operating pressure (403.2.1), hoop stress and surge (402.3, 403.3), the hydrostatic test (437.4), and the acceptance of corrosion and dents found in service (451.6.2)

New here? Read the User Manual — the equations, the test rules and the corrosion criteria.

◉ ASME B31.4-2016 · 403.2.1, 437.4, 451.6.2 · UPGRADE DUE: B31.4-2022 · NOT A REGULATORY SUBMISSION TOOL

⚠ Edition. Built on ASME B31.4-2016, the text on file. B31.4-2022 is current and has not been compared: the tool will be upgraded when that text is available. Pipe yield strengths (API 5L and ASTM) and the corroded-pipe equations of ASME B31G (named in 451.6.2.2 but a separate standard) are not in the B31.4 text supplied: the tool uses their published values and says where. Scope (400.1.1): liquid pipelines between production, storage, refineries, pump stations and terminals, and the piping within tank farms and terminals associated with them, from −30 to 120 °C. Indicative tool.

Identification

Company

Line / section ID

Location

Record Type

Units

B31.4 gives each equation in both systems (SI: bar and MPa). Records are kept in SI.

Summary

Enter the pipe and design pressure.

1. Pipe, Wall Thickness and Pressure (402.3, 403.2, 403.3)

Size

Outside diameter, D mm

Nominal wall thickness, t_n mm

Allowances A (corrosion, threads) mm

Pipe specification and grade

Specified minimum yield, S_y MPa

Seam (Table 403.2.1-1)

Location (Table 403.3.1-1)

Design factor, F (at most 0.72)

Internal design pressure, P_i bar

Design temperature °C

Maximum surge pressure (optional) bar

2. Hydrostatic Test (437.4)

Test pressure at the high point bar

Elevation difference, high to low point m

Test medium density kg/m³

Hold time achieved h

All pressured components visually inspected during the test (437.4.1 a 1)

Leak test hold, if required h

Test medium

3. Corrosion Found in Service (451.6.2.2)

Maximum depth of metal loss, d mm

Axial length of the corroded area, L mm

Wall thickness at the area (blank = t_n) mm

Type

Circumferential gap to a neighbouring area, C mm

Axial gap to a neighbouring area, L₃ mm

Length of the neighbouring area mm

Maximum operating pressure (blank = P_i) bar

4. Dents (451.6.2.4)

Dent depth mm

Contains a gouge, groove, scratch, crack or other stress riser Affects the pipe curvature at a girth or seam weld Contains metal loss leaving less than the minimum wall of the pipe specification

Test and Repair Checklist (437.4, 451.6)

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