
Reflect-O-Ray®EDS 6 Installation, Operation & Service
Combustion Research Corporation
GAS SUPPLY
In industrial installations where the natural gas pressure at
the meter is available at higher pressure than the standard
7" TO 14" W.C., it may be possible to cut down on gas
piping costs (when local codes and the Fire Marshal
approve) by running high pressure gas lines inside the
building or on the outside of the building. In no case should
the pressure exceed 10% of the service supply pressure.
When using a high pressure gas distribution system each
heating zone should be equipped with a pounds to inches
service regulator with soft seat, positive 100% lock-up.
Allowing high gas pressure on the downstream side of the
regulator will damage the control valve in the gas train. The
outlet pressure of the service regulators should be set at 7"
W.C. for natural gas and 11" W.C. for LP gases/propane
gases. If it is not practical to regulate in "zones", each
burner may be equipped with its own regulator.
To meet the requirements of 100% positive lock-up and
internal relief vent must be piped to the outside of the
building. It is recommended that an intermediate service
regulator, such as a Maxitrol 325 Series or approved equal
be used.
The typical discharge pressure on the downstream side of
the gas meter furnished by the gas company is usually 5
P.S.I.G. while the discharge pressure of the regulator on
the propane tank is usually set at 15 P.S.I.G.
Proper sizing of low and high pressure piping distribution
systems for natural gas should be made in accordance
with the National Fuel Gas Code, ANSI Z223.1 (current
standard) NFPA No. 54 for the United States or the
CAN/CGA-B149.1 & CAN/CGA –B149.2 gas code for
Canada. Consult the supplier of the propane tank and
vaporizing system for the sizing of the piping system for
LP gas pipe work.
When leak testing the gas piping system, the Reflect-O-
Ray®burners must be isolated from the gas piping
system. High-pressure compressed air used in the leak
test will damage the control valve in the burner gas train,
which will result in unsafe operation of the burner(s). For
proper and safe test procedures, observe the provisions of
Part #4, of the National Fuel Gas Code, ANSI Z223.1
(current standard) - Inspection, Testing and Purging or
refer to equivalent local. In Canadian see gas code
CAN/CGA-B149.1 & CAN/CGA –B149.2.
NOTE: It is important that the entire system, up to the
burner gas connection, be checked for leaks, prior to start
up.
TABLE
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
(Pressure Drop of 0.5 Inch Water Column and 0.6 Specific Gravity Natural Gas )
PIPE SIZE OF
STANDARD
SCH. 40 PIPE
TOTAL EQUIVALENT LENGTH OF PIPE (FEET)
10 20 30 40 50 75 100 125 150 175 200 250
3/4 272 193 157 136 115 99 82 76 67 65 58 52
1 545 385 315 272 244 198 173 154 141 130 122 109
1-1/4 1,201 848 693 600 537 439 380 340 310 287 268 240
1-1/2 1,862 1,316 1,074 931 832 680 588 527 480 445 416 372
2 3,766 2,663 2,174 1,884 1,680 1,373 1,190 1,065 971 900 841 753
2-1/2 6,165 4,358 3,559 3,082 2,752 2,254 1,950 1,743 1,593 1,473 1,379 1,233
3 10,502 7,426 6,063 5,250 5,015 3,841 3,549 3,106 2,895 2,682 2,508 2,242
4 22,031 15,577 12,718 11,015 10,510 8,158 7,430 6,548 6,060 5,066 5,250 4,700
TABLE
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
(Available Pressure 5 P.S.I.G. 10 % Pressure Drop and 0.6 Specific Gravity Natural Gas)
PIPE SIZE OF
STANDARD
SCH. 40 PIPE
TOTAL EQUIVALENT LENGTH OF PIPE (FEET)
50 100 150 200 250 300 400 500 1,000 1,500 2,000
1 1,863 1,320 1,074 931 832 760 658 584 416 341 293
1-1/4 3,880 2,744 2,240 1,938 1,732 1,580 1,370 1,218 866 708 609
1-1/2 5,860 4,140 3,375 2,920 2,620 2,384 2,065 1,835 1,310 1,070 918
2 11,360 8,060 6,560 5,680 5,080 4,640 4,025 3,570 2,540 2,080 1,792
2-1/2 18,280 12,933 10,540 9,140 8,180 7,460 6,460 5,740 4,090 3,390 2,875
3 32,620 23,100 18,800 16,300 14,500 13,310 11,520 10,250 7,290 5,960 5,125
4 67,400 47,600 38,840 33,650 30,160 27,550 23,800 21,140 15,080 12,330 10,620
5 122,900 86,900 71,000 61,400 55,000 50,200 43,450 38,600 27,500 22,570 19,400
6 201,000 142,700 115,000 100,300 89,800 82,100 71,800 63,000 44,900 36,700 31,590
8 418,000 295,000 240,800 208,500 186,800 170,800 148,000 131,200 93,400 73,400 65,600
Page 16