Gas Piping - Burnham 2PV Series Installation, Operating And Service Instructions

IV. Gas Piping
A.
Size gas piping. Design system to provide adequate gas
supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to
boiler. Maximum allowable system pressure is ½
psig. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum gas valve inlet pressure is listed on rating
label.
2. Maximum gas demand. Table 1 lists boiler input
rate. Also consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment).
Table 1: Rated Input
n I p
B o l i r e
c [ u b c i e f
M o d l e
N u m b r e
N t a r u l a G a s
2 0 3 P V 6 2
2 0 4 P V 9 6
2 0 5 P V 1 3 0
2 0 6 P V 1 6 4
8
Figure 4B: Boiler Piping for Zone Valve Zoned Heating Systems
t u R a e t
G
t e p r e h o u ] r
C o n n
i S
L P P / o r p a n e
2 4 ¾ ½
3 8 ½ ½
5 2 ½
6 5 ¾ ½
3. Length of piping and number of fi ttings. Refer to
Table 2 for maximum capacity of Schedule 40 pipe.
Table 3 lists equivalent pipe length for standard
fi ttings.
4. Specifi c gravity of gas. Gas piping systems for gas
with a specifi c gravity of 0.70 or less can be sized
directly from Table 2, unless authority having
jurisdiction specifi es a gravity factor be applied. For
specifi c gravity greater than 0.70, apply gravity
factor from Table 4. If exact specifi c gravity is not
shown choose next higher value.
For materials or conditions other than those listed
above, refer to National Fuel Gas Code, NFPA 54/
ANSI Z223.1, or size system using standard
engineering methods acceptable to authority having
jurisdiction.
a s
e t c o i n
B.
Connect boiler gas valve to gas supply system.
e z
1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow National Fuel
Gas Code, NFPA 54/ANSI Z223.1 and/or CAN/
CGA B149 Installation Codes.
2. Use thread (joint) compounds (pipe dope) resistant
to action of liquefi ed petroleum gas.