Natural Gas; Pipe Sizing; Supply Pressure Requirements - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 6 - GAS PIPING
6.2.

Natural Gas

6.2.1 Pipe Sizing

Refer to Table 1 below for schedule 40 metallic pipe
length and diameter requirements for natural gas,
based on rated PRESTIGE Excellence input (divide by
1,000 to obtain cubic feet per hour).
• Table 1 below is based on Natural Gas with a spe-
cific gravity of 0.60 and a pressure drop through the
gas piping of 0.30"w.c..
• For additional gas pipe sizing information, refer to
National Fuel Gas Code (NFPA 54 / ANSI Z223.1)
for installations in the U.S. or CAN/CSA B149.1 for
installations in Canada.

6.2.2 Supply Pressure Requirements

1. Pressure required at the gas valve inlet supply pres-
sure port:
• Maximum 13"w.c. at flow or no flow conditions
to the burner.
• Minimum 5"w.c. during flow conditions to the
burner. Must be verified during start up and
with all other gas appliances operating within
the building.
2. Install 100% lockup gas pressure regulator in the
gas supply line if inlet pressure can exceed 13"w.c
at any time. Adjust the lockup pressure regulator
for 13"w.c maximum.
Length of Pipe in Feet
SCH 40
10
20
30
40
50
75
100
150
26
Table 1 - Gas Piping Sizing - Natural Gas
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour (based
on 0.60 specific gravity, 0.30" w.c. pressure drop)
1/2" 3/4"
132 278
92 190
73 152
63 130
56 115
45 93
38 79
31 64
WARNING
DO NOT adjust or attempt to measure gas
valve outlet pressure. The gas valve is facto-
ry-set for the correct outlet pressure. This set-
ting is suitable for natural gas and propane
and requires no field adjustment. Attempts
by the installer to adjust or measure the gas
valve outlet pressure can result in damage to
the valve, causing substantial property dam-
age, serious injury, or death.
NOTICE
The natural gas orifice requirements are:
• PRESTIGE Excellence 110: 0.242" (6.15 mm)
•
WARNING
The PRESTIGE Excellence is factory equipped
with the required natural gas orifice. The nat-
ural gas orifice must never be modified or re-
placed with a different size orifice. Failure to
use the required natural gas orifice can result
in substantial property damage, serious injury,
or death.
1" 1-1/4"
520 1050
350 730
285 590
245 500
215 440
175 360
150 305
120 250
1-1/2"
1600
1100
890
760
670
545
460
380