𝑃_𝑎𝑣𝑔 − Average Initial Pipeline Pressure[psi]

𝑃_𝑏 − Base Pressure[psi]

𝑃 = 𝑃𝑎𝑣𝑔 + 𝑃𝑏

𝑡 – Temperature[℉]

𝐿 − Length of Pipeline[mi]

𝐷 − Pipe Inside Diameter[in]

𝑧 − Shut in Time[hr]

𝑅 – Constant[10.7316]

𝑁_𝑡 − Initial Test Pressure[psi]

𝑡 – Temperature[℉]

𝑇_𝑏 −Temperature Base[°R]

𝑉_𝑏 − Volume Lost[MSCF]

𝑇_𝑚 − Blowdown Time[min]

𝐷_𝑠 − Inside Diameter of Blowdown Stack[in]

𝐺 − Gas Specific Gravity

𝑛 − Number of Blowdown Stacks

𝑓 − Choke Factor

Input Parameters

1. To create a new case, click the “Add Case” button
2. Select the Gas Pipeline Blowdown – AGA Manual application from the Pipeline Testing module.
3. Enter Case Name, Location, Date and any necessary notes.
4. Fill out all required fields.
5. Make sure the values you are inputting are in the correct units.
6. Click the CALCULATE button.

• Average Initial Pressure(psi)
• Gas specific gravity
• Pipe Inside diameter(in)
• Length of Pipeline(miles)
• Number of Blowdown stacks
• Choke Factor (drop down)

Outputs/Reports

1. View the results.
2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
3. To SAVE, fill out all required case details then click the SAVE button.
4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
5. To generate a REPORT, click the REPORT button.
6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
7. To delete a case, click the DELETE icon near the top of the widget.

• Blowdown Time(min)
• Volume Lost(MSCF)

Related Links