Blodgett BC-20G manual Gas Connections, GAS Piping, Example, Pipe Nominal Size, Inches Length

Installation

Gas Connections

GAS PIPING

A properly sized gas supply system is essential for maximum oven performance. Piping should be sized to provide a supply of gas sufficient to meet the maximum demand 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 BC-20G 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 to- tal.

Previous Total	230,000 BTU
BC-20G (for hot air)	125,000 BTU
New Total	355,000 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 20’ (6 m) and the pipe size is 1” (2.54 cm).

4.Use the appropriate table to determine the to- tal capacity of your current gas piping.

The total capacity for this example is 465,000 BTU. Since the total required gas pressure, 355,000 BTU is less than 465,000 BTU, the current gas piping will not have to be in- creased.

NOTE: The BTU capacities given in the tables are for straight pipe lengths only. Any elbows or other fittings will decrease pipe capaci- ties. For example: a schedule 40-1/2” el- bow fitting has an equivalent cpapacity of 4.2” (10.2 cm) of straight pipe. Contact your local gas supplier if you have any questions.

Maximum Capacity of Iron Pipe in Cubic Feet

of Natural Gas Per Hour

(Pressure drop of 0.5 Inch W.C.)

Pipe		Nominal Size, Inches
Length
	3/4”	1”	1-1/4”	1-1/2”	2”
(ft)
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 P.P. Gas at 11” W.C.

(Pressure drop of 0.5 Inch W.C.)

Pipe Length	Inside Diameter, Inches
(ft)
	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

10