Pipeline Drying Calculator
Determines drying time and gas volumes for removing moisture from pipelines after hydrostatic testing. Calculates dew point reduction and purge requirements for commissioning activities.
Calculation Type:
Pipeline Parameters
inches
miles
Operating Conditions
PSIG
°F
°F
%
Slug Parameters
inches
feet
%
Drying Results
Methanol Required
-
gallons
Pipeline Volume- ft³
Initial Water Content- lb/MMCF
Target Water Content- lb/MMCF
Water to Remove- lbs
Methanol Required- lbs
Slug Results
Methanol Volume
-
gallons
Total Slug Volume- gallons
Water Volume- gallons
Methanol Weight- lbs
Water Weight- lbs
Total Weight- lbs
Water Absorption Capacity- lbs
Advertisement
Formula (Water Content)
W = f(P, T)
W = Water Content (lb/MMCF)
P = Pressure
T = Temperature
Water Content interpolated from industry charts (GPSA Engineering Data Book).
Methanol Required (lbs) = Water to Remove (lbs) / 0.7
Standards & References
GPSA Engineering Data Book Gas Processors Suppliers Association
API RP 1110 Recommended Practice for the Pressure Testing of Liquid Petroleum Pipelines
NACE SP0108 Methods for Controlling External Corrosion of Underground or Submerged Metallic Piping Systems
Important Notes
Methanol is highly flammable and toxic; handle with extreme care.
Ensure proper ventilation and personal protective equipment (PPE) during operations.
Disposal of methanol-water mixtures must comply with environmental regulations.
Slug calculations are simplified and may require adjustment for complex scenarios.