3 Frequently Asked Questions about Sizing a UMAC EFV
For Standard High Pressure (>5psig) Service Line Applications
No Second Stage Regulation

  1. Will the EFV Trip when I don't want it to?
  2. Will the EFV starve the system if the system pressure drops to a minimum? Or, will I have pressure at the service regulator?
  3. How long a service line can I have and assure the EFV will trip if there is a pipe break?

1. Will the EFV Trip when I don't want it to?
The Nominal Minimum Trip Point (SCFH) of the EFV must be greater than the Maximum anticipated customer gas load (SCFH) at the Minimum design Pressure of the system.

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2. Will the EFV starve the system if the system pressure drops to a minimum?
    Or, will I have pressure at the service regulator?

Assure that the total pressure drop across the EFV and service piping at the Maximum anticipated customer load (SCFH) and Minimum Design Pressure will satisfy the minimum pressure requirements to the service regulator. (Contact GasBreaker for EFV Application Chart - Normal Flow Conditions)

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3. How long a service line can I have and assure the EFV will trip if there is a pipe break?
At the Minimum Design Pressure of the system, the maximum anticipated length of service pipe must not be longer than the Maximum Recommended Length of Service to be used downstream of the EFV for the given diameter pipe. (Contact GasBreaker for Maximum Recommended Lengths of PE Service Tubing to be used Downstream of a UMAC EFV)

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