Hydro-test for pipeline

Asked by pparrene 4 years, 7 months ago | 2 Answers

Dear sir would you please to tell me how to calculate the hydrotest for the pipeline Rd khaled


2 Answers

0
phamus 4 years, 7 months ago

Not sure of what stage you want to hydrotest the pipeline, but beside the equation as shown, if it is during construction/commission and the entire length of the pipeline can be loaded on the vessel reel, a hydrotest of the pipeline should be performed in Contractor's yard to ensure that testings required by the client to confirm acceptable post-installation thermal performance.

In addition to the external hydrostatic pressure, calculations should also consider the resistance of pipelines to buckling and collapse due to the following combined actions which arise from the pipe mechanical and dimensional characteristics during the laying operations:

  • Bending stresses
  • Axial stresses

Hope that gives you some feedback on hydrotesting of the pipeline.


0
phamus 4 years, 7 months ago

Please consider the following equation for hydrostatic pressure test:

Pe = 9.806(Pw)(X)  (Metric units)

OR

P= (Pw/144)(X)  (Customary units)

Where:
Pe = External hydrostatic pressure, Pa (psi)
Pw = Density of external fluid, kg/m3 (lb/ft3)
X = Minimum pipeline depth below lowest astronomical tide (LAT), m (ft)


 

The minimum Test Pressure (Pt) should be determined from:

Pt = k(MAOP)

Where:
MAOP is Maximum Allowable Operating Pressure
k = 1.25, 1.40 or 1.50 depending upon the type of commissioning test and the piping code used

Note:  Refer to EPT 09-T-05 for the applicable piping code. The MAOP should not exceed the following:

  • The established pressure rating of the weakest component, including pipe
  • 80 percent of the Test Pressure (Pt)

Related Posts


Flowline - Pipeline Thermal Expansion Calculation
Flowline - Pipeline Thermal Expansion Calculation

SUMMARYFlowline/Pipeline Thermal/Pressure Expansion can be developed for submarine pipelines (both single pipe and Pipe-in-pipe) expansion assessments due to pressure and …

Piping and Vessels Preparation for Commissioning - Part 3
Piping and Vessels Preparation for Commissioning - Part 3

Part 2 - Leak Test 3. Dry-out3.1 GeneralAt the end of construction, and following commissioning tasks such as water flushing, …

Piping and Vessels Preparation for Commissioning - Part 5
Piping and Vessels Preparation for Commissioning - Part 5

Continue of Part 4 - Chemicals Loading of Vessels5. Inert gas purging 5.1 GeneralInert gas purging is most frequently required …

Pipeline Abandonment
Pipeline Abandonment

Requirements Pipelines should be decommissioned and abandoned (by removal or abandonment-in-place) in accordance with applicable national, regional and local regulations …

Oil production well simulation modeling problems and uncertainties
Oil production well simulation modeling problems and uncertainties

Oil and gas well modeling problems and uncertainties such as transient effects in the earth/formation for a single well, repeated …

Preventing scales in pipelines, wells, injection manifolds, etc.
Preventing scales in pipelines, wells, injection manifolds, etc.

Scale in pipelines, wells, injection manifolds greatly impacts the facility in a number of ways including deferred production, lost revenue …