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| SIZING EXAMPLE |
Frequently 2 psi piping systems are sized with a 1.5 psi pressure drop through the copper or stainless steel tubing. This means there will be 2 psi at the inlet of the regulator under no flow conditions, and 1/2 psi at the regulator inlet under maximum flow conditions.
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To select a line regulator of ample flow, the following must be known:
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- Available inlet pressure (max static / min operating)
- Desired outlet pressure
- Required max capacity (total load - all appliances combined) and max individual load.
- Pipe size
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Known: |
- Required - 1/2" NPT line regulator, outlet pressure of 7" w.c., with a static pressure of 2 psi and a min operating inlet pressure of 3/4 psi.
- Combined Btu rating of all appliances to be served by the regulator - 145,000 Btu/hr
- Largest single appliance's Btu rating - 90,000 Btu/hr
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- In the CAPACITIES chart (see navigation button CSA Capacities), locate rows where 1/2" (pipe size) models with 7" w.c. outlet pressure - intersect with - 3/4 psi operating inlet pressure column. (325-3L = 200 CFH, 325-5AL = 425 CFH)
- The total Btu load requirement can not exceed the equivalent CFH result from step 1. The combined 145,000 Btu/hr requirement does not exceed either model's capacity.
- The 90,000 Btu/hr single largest appliance rating is below the 325-3L maximum individual load capacity of 140,000 Btu/hr.
- The 325-3L is the smallest acceptable line regulator for this application.
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