GAS FACTS & RULES OF THUMB

Information Required to Select Gas Regulators and Flow Meters • Flow rate and gas expressed in CFH or BTU/hr • Inlet pressure of gas flowing into the regulator/flow meter • Regulated or desired outlet pressure leaving the regulator • Flowing media (i.e. natural gas, propane gas, compressed air, etc.) and physical properties if other than common gases • Line size of the piping system in which the regulator or meter will be installed • Desired mechanical or electrical characteristics coming from the flow meter (i.e. pulse, current, or voltage relative to flow rate     Gas Pressure Regulator Venting (TO BE USED AS A GENERAL RULE OF THUMB ONLY) • Use the same size or larger pipe as the vent connection on the regulator. Vent piping runs should be kept as short as possible with limited bends and elbows. • For every ten feet of straight pipe run beyond the first ten feet from the regulator increase vent line size 1 nominal pipe size back to the regulator vent connection. 1 pipe elbow=10 feet of straight pipe run • Never vent multiple regulators together with the same vent line • Note: Special care is required not to screw vent pping too deeply into the vent connection. This can cause improper vent operation • Line size of the piping system in which the regulator or meter will be installed • Desired mechanical or electrical characteristics coming from the flow meter (i.e. pulse, current, or voltage relative to flow rate

DO YOU HAVE A GAS REGULATOR OR FLOW METER APPLICATION?

Complete and Return the Information Below and Let Us Help You Select the Best Regulator or Meter to Fit Your Application Needs

Type of Gas? Natural, Propane, Air, Nitrogen or Other. Inlet Gas Pressure? Regulated or Outlet Pressure, or Set Point? What is the Capacity or Flow Rate? (BTU/H or CF/H). Line Size the Regulator will be Installed into?   Type of Gas? Natural, Propane or Other. Inlet Gas Pressure to the Meter? What is the Capacity or Flow Rate? (BTU/H or CF/H) Output Required? Direct Read, Compensated, Pulse, or Analog. Accessories? Strainer, Installation Flange Kit, etc. Name Email Phone

1 ton a/c = 12,000 BTU per hour 1 Boiler HP = 42,000 BTU input (@ approx. 80% efficiency) 100 Boiler HP = 42 therm Input (@ approx. 80% efficiency) 100 lb Steam = 1 therm (approx.) 1 Engine HP = 10,000 BTU input (approx.) 1 British Thermal Unit = Energy required to raise the temperature of 1 lb. Mass of water by 1° F 1 SCF natural gas = 1,000 BTU (approx.) 100 SCF natural gas = 1 therm (approx.) 1 MSCF natural gas = 1,000 scf 1 MSCF = 10 therm 1 Therm = 29.3 kilowatt hr Standard Cubic Foot = Volume of gas at standard conditions Standard conditions = 60° F @ 14.73 psia Normal Stack Temp on a 30 psig Hot Water Boiler = 340°F SCFH = Volume flow rate per hour @ standard conditions Degrees Rankin = Degrees F + 459.67°

ACSH - actual cubic feet per hour ACFM - actual cubic feet per minute BTU - British thermal unit MSCF - (thousand) standard cubic feet N.O. - Normally open N.C. - Normally closed PSI - pounds per square inch PSIA - pounds per square inch absolute PSIG - pounds per square inch gauge SCFH - Standard cubic feet per hour w.c. - inches of water column G - Gravity H - Pressure drop Q - Flow T - Temperature W - Flow rate

1 PSIG = 27.68 inches Water Column (WC)   1 Cubic Foot of Propane Gas = 2,500 BTU's BTU = British Thermal Unit   1,000 BTU's = 1 CFH (Cubic Feet per Hour) 1 MSCFH natural Gas = 1 1,000 SCFH   1 Unit of Natural Gas = 10 Thers = 1,000 BTU's 1 Standard Cubic Foot of natural Gas = 1,000 BTU's   1 Boiler Horse Power = 42,000 BTU Input (Assumes 80% Efficiency)