FLEXIBLE, HIGH PRESSURE GAS PIPE - aohomeinspection.com

1 2-psi Gas Piping MS2050-08/05 The 2-psi domestic gas piping concept was first introduced nearly 40 years ago, and has become a proven cost-savingload builder for gas utilities, as well as a viable option for HVAC system consists of gas metered at 2-psi (or sometimes 5-psi), with tubing used instead of traditional pipe forinternal household distribution. At or near appliances, gas PRESSURE is reduced to 7 or 8 by a Maxitrol 325 Series L-model gas PRESSURE BV Series manual ball valve is also available, designed especially for use with our 325 Series L-model gas pressureregulators.

2 They offer the perfect combination for household piping needs. flexible , high PRESSURE GAS pipe 325 SERIES GAS PRESSURE REGULATOR MANUAL GAS BALL VALVEA Time for , gas piping systems have predominantly been 3/4 black iron or steelpipe. The development of semi-rigid copper tubing and the introduction ofcorrugated stainless steel (CSST) have provided HVAC contractors a way to makethe transition into the field of gas piping systems. The gas piping, however, makesup only one component in the design and installation of the residential andcommercial 2-psi gas piping systems.

3 An operating PRESSURE change is the heart ofthe new system entire 2-psi concept would not have been possible without the development ofthe compact, low-cost Maxitrol pounds-to-inches regulators. These regulatorsreduce inlet PRESSURE as high as 5-psi down to appliance use deliver positive dead-end lockup, the 325 Series L-model regulators feature ahigh leverage valve linkage assembly. They are capable of precise regulatingcontrol from full flow down to pilot flows. When combined with Maxitrol s ventlimiting devices, labor and material costs are reduced by eliminating vent lines to third component of the 2-psi gas piping system is Maxitrol s manual gas ballvalve, which is designed for quick, quarter-turn operation.

4 The 325 Series L-modelgas PRESSURE regulators are CSA certified for 2-psi and 5-psi (see line standard,page 3) system applications. Our manual ball valves are certified as continues to grow at an accelerated rate, as more utilities put the 2-psiconcept to work. The 2-psi system is now being utilized worldwide on newconstruction and LP your Domestic Gas Piping Needs!A copyrighted publication ofTypical 2-psi house piping system usingMaxitrol 325 Series gas PRESSURE regulators Use one with each appliance:1.

5 Gas Furnace3. Gas Dryer2. Gas Water Heater4. Gas RangeElevated PRESSURE Piping Systems Stimulates New Markets: LP conversions, business,multifamily dwellings, new custom and project , 2-psi for residential applications and 5-psifor some commercial applications. Reduces Installation Cost: Cheaper to pipe thanconventional low PRESSURE system. Greater Protection: Less gas leakage from 3/8 diameter tubing semi-rigid piping systems alsocontain less GAS CONVERSIONMany gas utilities are using the 2-psi system forfranchise extension into areas previously served byLPG.

6 There is significant installation savings when theexisting 3/8 OD copper tubing already in the homes isutilized. Since the new meter set may be some distancefrom the old LP tubing , a tie line is sometimes required,and this is often 1/2 tubing . One or more Maxitrol fuelline regulators are installed downstream at the appliancetake-off points, so that no more than 1 drop isexperienced from the outlet of the Maxitrol regulator tothe entrance of the appliance RISE APARTMENTSHigh rise apartment buildings now offer great new loadbuilding capability to gas utilities, as well.

7 Copper tubinghas been used to deliver 2-psi service to high riseinstallations with significant savings over conventionalhigh rise HOMES AND SUBDIVISIONSIn addition, the all gas neighborhood makes a lot ofsense to utilities, builders and home buyers when it simplemented with the 2-psi system. Utilities can offerproject and custom builders a more attractive package ,not only in cost, but in appearance and safety. Thesmall tubing running from meter to appliances definitely clean-up the basement, and pose no more placementor installation problems than electrical an Improved utilities have found less complaint call backswith 2-psi than with a 6 Escapement Volume: Gas at 6 escapes froma 3/4 pipe at about three times the rate of gas from a 3/8 OD tube at 2-psi.

8 The chart below shows flowcomparisons at the discharge end. From the standpointof uncontrolled escape of gas within a building, the 2-psisystem has less flow than the 6 Leakage Complaints: Statistics to date indicateless leakage complaints from the 2-psi system than fromthe 6 system. One utility reported no complaint callbacks within one year in a high rise apartment involving274 Characteristics: The 325 Series L-modelregulator is excellent for controlling the full range of flowrates from main burner loads down to pilot loads.

9 Thelever acting 325 Series regulator possesses excellentlock-up Limiting (325-3L & 325-5AL only): Maxitrol offersoptional vent limiting devices which eliminate the need torun vent piping to an outside area. In the event of adiaphragm rupture, gas escapement is limited to withinANSI standard Practices Proved: Both flared fittings and silversoldered fittings have been used without event onthe 2-psi system. There are fewer joints in the 2-psi system than in the 6 Nailing Problems: At the outset of the 2-psisystem, some feared nails would be inadvertentlydriven into the tubing .

10 However, experience hasshown that nails could not be driven into tubingthat was loose between joists or studs. At pointswhere tubing is to be firmly fixed against wood sothat it is in a rigid state, manufacturers typicallyoffer a variety of shielding FROM OPEN PIPECFH of Natural Gas 1000 Escape VolumeLength of Service25 iron pipe at 6 OD tubing at 2-psi100 supply pressures above 2-psi, the new standardrequires the use of an over- PRESSURE protection device(OPD) for use with the regulator. (See below.)