Gas Down Choke Pressure

Gas down choke pressure spreadsheet description : this spreadsheet calculates upstream pressure at choke for dry gases.

Instructions:

Update values in the Input Data section of Gas down choke pressure

such as:

• Upstream pressure:
• Choke size:
• Flowline ID:
• Gas production rate:
• Gas specific gravity:
• Gas specific heat ratio (k):
• Upstream temperature:
• Choke discharge coefficient:

Click Solution button

On solution section you can find

Choke area:

Critical pressure ratio:

Maximum downstream pressure for minimum sonic flow:

Flow rate at the minimum sonic flow condition:

Flow regime (1=sonic flow; -1=subsonic flow):

The maximum possible down stream pressure in sonic flow:

Down stream pressure given by subsonic flow equation:

Estimated down stream pressure: