Gas Supply Pressure and Piping Design

Miura standard supply guidance is 3 to 5 psig upstream of the boiler gas train, subject to the installation manual and project-specific regulator selection. Pressure that is too low can cause ignition failure, unstable combustion, or failure to transition firing stages. Pressure above equipment ratings is unacceptable.

Conversion: 1 psi = 27.7 in. w.c. Actual required inlet pressure depends on model, load, regulator setpoint, and pressure drop through the service and piping.

1. Obtain maximum input and allowable inlet-pressure range from the current submittal.
2. Size piping and regulators for coincident operating load, not one boiler unless operation is interlocked.
3. Check available pressure at maximum flow.
4. Confirm regulator outlet remains below its inlet pressure at high fire.
5. Verify local requirements, including special regulator ratings.