Pipeline Welding Inspection Company

This page provides a brief information about pipeline welding inspection company services based on requirements of ASME B31.4 standard for pipeline transportation systems for liquid hydrocarbons and other liquids and ASME B31.8 standard for gas transmission and distribution piping systems. Both of above standard refer detail of inspection activities to the API Standard 1104 - welding of pipelines and related facilities.

Our pipeline welding Inspectors make sure that all requirements of both construction codes (ASME B31.4 and ASME B31.8) and referenced code (API 1104) are met. 

They also check and control all regulatory requirement such as DOT 190 and DOT 192.

We conduct our pipeline welding inspection in 3 stages as below:

Stage 1 -  Tasks Prior to Welding Work

Stage 2 - Tasks during Welding Operations

Stage 3 - Tasks Upon Completion Of Welding

For more detail review welding inspection company article. 

The inspection activities are done based on approved pipeline project inspection and test plan. Based on hold, witness and review points our inspectors supervise and control pipeline contractor construction activities. 

All hold and witness point have specific inspection form. The inspection forms will be approved by client before application.

The most important form are:

Pipeline Daily Fit Up and Welding Form 

This form includes all information about:

Client Name, Contractor Name, Inspection Agency Name, Reference Standard number, Report Number, Date of Report, Pipeline Name,Line Number and Section Number, Weld Number, Outside Diameter, Pipe Thickness, Type of Clamp, Removal of Clamp (%), Amount of High-Low, Fit Up Result, Welder ID for Root, Hot and Cap Passes, Material Spec, WPS Number, Pre-Heat and VT Result 

Pipeline Hydrostatic Test Report (Cleaning, Gauging, Pressure Test & Drying)

This form includes all information about:

General Information

Client Name, Contractor Name, Inspection Agency Name, Reference Standard number, Report Number, Date of Report, Pipeline Name, Test Section, From Joint No./Sec to Joint No./Sec., Test Section Length, Line No./Test Section No, Class (ANSI Rating), Design Pressure, Location Class (Acc. to ANSI/ASME B31.8, Design Factor, Lowest point elevation, Highest point elevation, Pipeline Size (Diameter), Pipe Material, Wall Thickness, High Point Vent(s) Installed & Quantity, Low Point Vent(s) Installed & Quantity, Maximum Allowable Pressure at Lowest Point (psi), Minimum Acceptable Test Pressure at Highest Point (psi),

Test Equipment

Air Compressor Type & Capacity, Pressure Gauge quantity, Capacity and Calibration Status, Recorder Calibration Status, Dead Weight Tester Calibration Status


Water Volume, Amount of Corrosion Inhibitor (if Applicable), Launching Date/Time, Receiving Date/Time, Result of Cleaning


Pipeline Inside Diameter (Minimum), Gauging Plate Material, Gauging Plate Diameter, Gauging Plate Thickness, Launching Date/Time, Receiving Date/Time, Result of Gauging

Pressure Test

Date/Time Test Started, Date/Time Test Finished, Minimum Test Pressure (psi), Maximum Test Pressure (psi), Minimum Test Temperature (˚C), Maximum Test Temperature (˚C), Result of Pressure Test

Dewatering & Draying

Dewatering Date/Time, Dewatering Duration, Result of Drying 

The other important forms are pipe bending report and pipeline book. 

End - Pipeline Welding Inspection Company

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