Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Bulletin No. 4660-PGP2T
0
Parflex
®
Flexible Gas Piping System
Design and Installation Guide
Section 3.0 System Configuration & Sizing
5. Sizing Section C—Section C must supply the water heater and dryer. The total appliance load is 34
+ 25 = 59 CFH. Using the longest length method, the length is 50 ft. Referring to Table 1 under the
50 ft. length column, we find that 3/4 inch (PGP-12) has flow capacity above 59 CFH (75). Use 3/4
inch (PGP-12) to run Section C.
6. Sizing Section D—Section D must supply the water heater. The total appliance load is 34 CFH.
Using the longest length method, the length is 50 ft. Referring to Table 1 under the 50 ft. length
column, we find that 1/2 inch (PGP-8) has flow capacity above 34 CFH (42). Use 1/2 inch (PGP-8) to
run Section D.
7. Sizing Section E—The total appliance load is 50 CFH. Using the longest length method, the length
from the range/oven is 20 ft. (A = 8 ft. + B = 10 ft. + E = 2 ft.). From Table 1 under the 20 ft. length
column, we find that 1/2 inch (PGP-8) has flow capacity above 50 CFH (64). Use 1/2 inch (PGP-8) to
run Section E.
8. Sizing Section F—The total appliance load is 75 CFH. The length is 14 ft. (A =8 ft. + F = 6 ft.). Be-
cause there is no 14 ft. column, use the next longer length column. From Table 1 under the 15 ft.
length column, we find that 3/4” (PGP-12) has flow capacity above 75 CFH (134). Use 3/4” (PGP-
12) to run Section F.
9. Sizing Section G—The total appliance load is 25 CFH. The length is 38 ft. (A = 8 ft. + B = 10 ft. + C =
12 ft. + G = 8 ft.). Because there is no 38 ft. column, use the next longer length column. From Table
1 under the 40 ft. column, we find that 1/2 inch (PGP-8) has flow capacity above 25 CFH (47). Use
1/2” (PGP-8) to run Section G.
3.2.2
Longest Length Series System Example (low Pressure) Continued