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Vessel Sizing Calculator

Per API 12J & GPSA Standards

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Pressure Vessel Sizing Calculator
Sizes separators, scrubbers, and knockout drums using Souders-Brown velocity and retention time criteria. Determines vessel dimensions and internals per API 12J and GPSA separation guidelines.

Flow Rates

MMscfd
bpd

Operating Conditions

psig
°F
-
-

Design Parameters

K-factor per GPSA Table 7-3
min
Typical: 1-3 min (2-phase), 3-10 min (3-phase)
-
Typical: 2.5-5 for horizontal vessels
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Formula

Vt = K × √((ρL - ρG) / ρG)
Vt = Terminal velocity (ft/s)
K = Souders-Brown constant
ρL = Liquid density (lb/ft³)
ρG = Gas density (lb/ft³)

Standards & References

  • API 12J
    Specification for Oil and Gas Separators
  • GPSA Data Book
    Section 7: Separation Equipment
  • ASME Section VIII
    Pressure Vessel Design Code
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