Installation Instructions

EXAMPLE #2, MEDIUM PRESSURE PARALLEL SYSTEM
SIZING, SECTION A:
Determine distance from the meter to the farthest appliance (water heater 60 ft.) Determine the total appliance load
supply by Section A (169 CFH). Referring to Table 4 under the 60 ft. length column, we find 3/4 inch has flow
capacity above 169 CFH (274 CFH). Use 3/4" tubing to run Section A.
SIZING SECTION B:
Section B supplies the oven/range. The total pressure drop is considered from the meter to the oven/range. The total
appliance load is 45 CFH and the length is 10 ft + 20 ft. = 30 feet total. Referring to Table 4 under the 30 ft. length col-
umn, we find that 3/8 inch has a flow capacity above 45 CFH (94 CFH). Use 3/8" tubing to run Section B.
SIZING SECTION C:
Section C supplies the furnace. The total appliance load is 75 CFH and the total length is 10 ft. + 5 ft. = 15 ft total.
Referring to Table 4 under the 15 ft. length column. We find that 3/8 inch has a flow capacity above
75 CFH (134 CFH) Use 3/8" tubing to run Section C.
SIZING SECTION D:
Section D supplies the dryer. The total appliance load is 25 CFH and the total length from the meter is
10 ft. + 35 ft. = 45 feet total. Referring to Table 4 under the 45 ft. length column. Since 45 ft. does not appear in the
tab
le, use the next longest run column of 50 ft. We find that 3/8 inch has a flow capacity above 25 CFH (73 CFH) Use
3/8”
tubing to r
un Section D
.
SIZING SECTION E:
Section E supplies the water heater. The total appliance load is 24 CFH and the total length from the meter to
appliance is 10 ft + 50 ft = 60 feet total. Referring to Table 4 under the 60 ft. length column, we find that 3/8 inch has
a flo
w capacity abov
e 24 CFH (65 CFH) Use 3/8" tubing to run Section E.
12
T
his is a medium-pressure parallel system which includes a
distribution tee manifold. The natural gas supply pressure is 1/2
psig and the maximum allowable pressure drop from the meter
to the farthest appliance is 6" WC.
Medium Pressure (1/2 psig) Natural Gas (Parallel System)
Appliance
Loads Lengths size
A = 10 FT 3/4"
O
ven/Range 45 CFH B = 20 FT 3/8"
F
urnace = 75 CFH C= 5 FT 3/8"
Dryer = 25 CFH D = 35 FT 3/8"
W
ater Heater = 24CFH E= 50 FT 3/8"
TOTAL CFH.... 169 CFH