Patterson-Kelley MOD-04 Installation And Owner's Manual page 13

®
Modu-Fire Gas-Fired Boiler
Remote Gas
Shutoff (not
supplied)
Drip Leg
Gas Meter (not
supplied)
Note: Install a sediment trap (drip leg) and a union
connection ahead of the primary manual shutoff valve
Pipe Capacity for Natural Gas
Nominal
Iron Internal
Pipe
Diameter
Size
(Inches)
(Inches)
1-1/4 1.380
1-1/2 1.610
2 2.067
2-1/2 2.469
3 3.068
4 4.026
By Installer
Union
Shutoff (on
boiler)
Gas Piping
Equivalent Pipe Length
90º Ell Tee
(Feet) (Feet)
3.45 6.9
4.02 8.04
5.17 10.3
6.16 12.3
7.67 15.3
10.1 20.2
on the boiler. Gas piping should be installed in accor-
dance with National Fuel Gas Code, ANSI Z223.1,
latest edition, and any other local codes which may
apply; in Canada see CAN/CGA-B 149.
Note: See chart below for required pipe size, based on
overall length of pipe from meter plus equivalent
length of all fittings. Approximate sizing may be based
on 1 cubic foot of natural gas per 1,000 Btu per hour
input, i.e., 900,000 Btu per hour requires about 900
cubic feet per hour. (See Typical Boiler Operating
Conditions, Section 4.3, for more information.)
WARNING!
All threaded connections must be made using a pipe
compound that is resistant to the action of liquefied
petroleum gases. Do not use Teflon tape on gas line
threads.
Maximum Capacity in Cubic Feet of Natural Gas per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length of
20 40 60
950
1,460 990 810
2,750 1,900 1,520
4,350 3,000 2,400
7,700 5,300 4,300
15,800 10,900 8,800
10
Pipe (in feet)
80 100
1,300 1,150
2,050 1,850 1,500
3,700 3,250 2,650
7,500 6,700 5,500
Installation
150 200
950 800
1,280
2,280
4,600