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OIL SUPPLY PIPING

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 GAS SUPPLY PIPING Gas  piping  should  be  sized  to  provide  required  pressure at    the    burner    train    inlet    manual    shutoff    cock,    when operating at the maximum desired fuel input. All  gas  piping  should  be  appropriately  pressure  tested  to ensure leak free operation.  It is recommended that a dirt pocket  or  trap  be  piped  into  the  gas  supply  system  just ahead of the burner train inlet manual shutoff cock. When  testing  with  pressures  higher  than  the  maximum pressure ratings of the  gas  train  components,  be  sure  to isolate  these  components  and  test  their  piping  for  gas maximum  main  gas  train  and/or  pilot  gas  train  components pressure is 1/2 psig.  (14" W.C.). Refer  to  Table  3  for  information  relating  to  the  sizing  of  gas supply  piping.    These  charts  are  based  on  the  general  flow characteristics  of  commercially  produced  black  wrought  iron pipe.    If  in  doubt  regarding  flow  capabilities  of  a  chosen  line size, the next largest size is recommended. Refer   to   page   9,   Figs.      8   and   9   for   typical   gas   piping schematics to meet  U.L.    requirements  in  the  C  burner  firing ranges. Table 3 Capacity of Pipe · Natural Gas (CFH) With Pressure Drop of 0.3" w.c.  and Specific Gravity of 0.60 Pipe Length Pipe Size - Inches (IPS) In Feet 1 1¼ 1½ 2 2½ 3 4 10 520 1050 1600 3050 4800 8500 17500 20 350 730 1100 2100 3300 5900 12000 30 285 590 890 1650 2700 4700 9700 40 245 500 760 1450 2300 4100 8300 50 215 440 670 1270 2000 3600 7400 60 195 400 610 1150 1850 3250 6800 70 180 370 560 1050 1700 3000 6200 80 170 350 530 990 1600 2800 5800 90 160 320 490 930 1500 2600 5400 100 150 305 460 870 1400 2500 5100 125 130 275 410 780 1250 2200 4500 150 120 250 380 710 1130 2000 4100 175 110 225 350 650 1050 1850 3800 200 100 210 320 610 980 1700 3500 Table 3A Correction Factors Specific Gravity Pressure Drop Other Than 0.60 Other Than 0.3 Specific Multiplier Pressure Multiplier Gravity Drop 0.50 1.10 0.1 0.577 0.60 1.00 0.2 0.815 0.70 0.926 0.3 1.00 0.80 0.867 0.4 1.16 0.90 0.817 0.6 1.42 1.00 0.775 0.8 1.64 Propane - Air 1.0 1.83 1.10   0.740 2.0 2.58 Propane 3.0 3.16 1.55 0.622 4.0 3.65 Butane 6.0 4.47 2.00   0.547 8.0 5.15 Note: Use multiplier at right for other specific gravities and pressure drops. Table 4 Equivalent Length of Fittings in Feet Pipe Size (IPS) 1 1.25 1.5 2 2.5 3 4 Std. Tee through Side 5.5 7.5 9.0 12.0 14.0 17.0 22.0 Std.  E11 2.7 3.7 4.3 5.5 6.5 8.0 12.0 45 E11 1.2 1.6 2.0 2.5 3.0 3.7 5.0 Plug Cock 3.0 4.0 5.5 7.5 9.0 12.0 16.0 Table 5 Gas Train Components Supplied for Standard U.L.  Burner Requirements See Gas Flow Schematics Fig.  8 and 9 for additional information. Fuel Air Control Modes of Operation On/Off   Low/High/Off   Low/High/Low Modulating Main Gas Cock XU XU XU XU Main Gas Pressure Regulator XU* XU XU XU High and Low Gas Pressure Switches OU X1U X1U X1U Automatic Main Gas Valve XU* X X XU Automatic Main Gas Valve with Proof of Closure O X1 X1 X1 Main Auxiliary Gas Valve O X2 X2 X2 Leak Test Gas Cock XU X X XU Pilot Cock Pressure Regulator & Solenoid Valve X X X X Modulating Butterfly Valve N/A N/A N/A X Side Tee Orifice Assembly X X X N/A Main and/or Pilot Gas Pressure Gauge O O O O (page  3 - 960)







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