Gas Pipeline Pressure Testing - Maximum Pressure Drop

Maximum pressure drop is performed by balancing changes in the measured pressure in the test section against the theoretical pressure changes calculated from changes in the measured temperature of the test section.
Ambient temperature swings can cause challenges regarding pressure changes. Temperature gauges must far enough away from exposed piping to avoid erroneous readings.

PTLB Testing 2.3_Intro.png

𝑃𝑚𝑎𝑥 − Maximum Pressure Drop[psi]
𝐷 − Internal Pipe Diameter[in]
𝑡 − Shut in Time[hr]
𝑃1 − Initial Test Pressure[psi]

Input Parameters
To create a new case, click the “Add Case” button
Select the Gas Pipeline Pressure Testing – Maximum Pressure Drop application from the Pipeline Testing module.
Enter Case Name, Location, Date and any necessary notes.
Fill out all required fields.
Make sure the values you are inputting are in the correct units.
Click the CALCULATE button.
Initial Pressure(psi)
Shut-in time(hr.)
Internal pipe diameter(in)
PTLB Testing – Liquid 2.3 Input.png

Outputs/Reports
View the results.
If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
To SAVE, fill out all required case details then click the SAVE button.
To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
To generate a REPORT, click the REPORT button.
The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
To delete a case, click the DELETE icon near the top of the widget.
Acceptable pressure loss(psi)
PTLB Testing – Liquid 2.3 Output.png

Related Links
Pipeline Testing – Liquid Services