Blodgett DFG-100 XCEL - Manual (Page 12)

10
Installation
Gas Connection
GAS PiPinG
A properly sized gas supply system is essential for maxi-
mum oven performance. Piping should be sized to pro-
vide a supply of gas sufficient to meet the maximum de-
mand of all appliances on the line without loss of pressure
at the equipment.
Example:
NOTE: BTU values in the following example are for
natural gas.
You purchase a DFG-100 XCEL convection oven to add
to your existing cook line.
1. Add the BTU rating of your current appliances.
Pitco Fryer 120,000 BTU
6 Burner Range 60,000 BTU
Deck Oven 50,000 BTU
Total 230,000 BTU
2. Add the BTU rating of the new oven to the total.
Previous Total 230,000 BTU
DFG-100 XCEL (high rate) 80,000 BTU
New Total
310,000 BTU
3. Measure the distance from the gas meter to the cook
line. This is the pipe length. Let’s say the pipe length
is 40’ (12.2 m) and the pipe size is 1” (2.54 cm).
4. Use the appropriate table to determine the total ca-
pacity of your current gas piping.
The total capacity for this example is 320,000 BTU. Since
the total required gas pressure, 310,000 BTU is less than
320,000 BTU, the current gas piping will not have to be
increased.
NOTE: The BTU capacities given in the tables are for
straight pipe lengths only. Any elbows or other
fittings will decrease pipe capacities. Contact
your local gas supplier if you have any ques-
tions.
Maximum Capacity of iron Pipe in Cubic Feet of
natural Gas Per hour
(Pressure drop of 0.5 Inch W.C.)
PiPE
LEnGth (Ft)
noMinAL SizE, inChES
3/4” 1” 1-1/4” 1-1/2” 2”
10 360 680 1400 2100 3950
20 250 465 950 1460 2750
30 200 375 770 1180 2200
40 170 320 660 990 1900
50 151 285 580 900 1680
60 138 260 530 810 1520
70 125 240 490 750 1400
80 118 220 460 690 1300
90 110 205 430 650 1220
100 103 195 400 620 1150
From the National Fuel Gas Code Part 10 Table 10-2
Maximum Capacity of Pipe in thousands of
BtU/hr of Undiluted L.P. Gas at 11” W.C.
(Pressure drop of 0.5 Inch W.C.)
PiPE
LEnGth (Ft)
oUtSiDE DiAMEtER, inChES
3/4” 1” 1-1/2”
10 608 1146 3525
20 418 788 2423
30 336 632 1946
40 287 541 1665
50 255 480 1476
60 231 435 1337
70 215 404 1241
80 198 372 1144
90 187 351 1079
100 175 330 1014
From the National Fuel Gas Code Part 10 Table 10-15