Brochure

Gastite Division, Titeflex Corporation
1116 Vaughn Parkway / Portland, TN 37148
800.662.0208 / www.gastite.com / [e-mail]
25
April 2015
Section 3: System Configuration
3.2.5 Example 4 - Dual Pressure System – 2 PSI Trunk and 8"WC Appliance Runs
Figure 3-12 below shows the same house and similar piping system as Example 3. e piping is arranged in parallel fashion,
with individual CSST appliance runs supplied by a main distribution manifold. A regulator is mounted at the manifold. e
utility company’s supply pressure (downstream of the meter) is 2 PSI. e utility company advises that the specific gravity
of the gas delivered will be 0.60 and the energy content is 1 CFH = 1000 BTUH. e pounds-to-inches regulator is set to
8"WC. Downstream of the regulator the allowable pressure drop across the system has been determined to be 3"WC (supply
pressure 8"WC - appliance requirement 5"WC). Upstream of the regulator the 2 PSI line pressure chart with a pressure drop
of 1 PSI can be used. is will supply the regulator with the 1 PSI inlet pressure required for full capacity flow.
Table 3-5
Section Description Load Delivered by Section Section Length Run Length Tube Size
“A” – Trunk 221 CFH = 221,000 BTUH 45 feet 45 feet 1/2" CSST
“B” – Furnace 80 CFH = 80,000 BTUH 15 feet 15 feet 1/2" CSST
“C” – Water Heater 36 CFH = 36,000 BTUH 10 feet 10 feet 3/8" CSST
“D” – Range 52 CFH = 52,000 BTUH 20 feet 20 feet 3/8" CSST
“E” – Dryer/BBQ 53 CFH = 53,000 BTUH 20 feet 25 feet 1/2" CSST
“F” – Dryer 28 CFH = 28,000 BTUH 5 feet 25 feet 3/8" CSST
“G” – BBQ 25 CFH = 25,000 BTUH 5 feet 25 feet 3/8" CSST
Run Length for Trunk Sections = Distance from meter to regulator
Run Length for Appliance Sections = Distance from regulator to each appliance
SIZING RUN “A”
• Run “A” is sized by the total load of all appliances and the run length from the meter to the regulator
• e total load of all appliances is 80 + 36 + 52 + 28 + 25 = 221CFH
• e run length to the regulator is 45ft
• Referring to Table 7-10 (2 PSI line pressure, 1 PSI pressure drop) for a 45ft run, 1/2" CSST has a capacity over 221CFH
(actual: 307)
SIZING RUN “B”
• Run “B” is sized by the load of the supplied appliance and the run length from the regulator to the supplied appliance
• e load of the furnace is 80CFH
• e run length to the furnace is 15ft
• Referring to Table 7-5 (3.0"WC pressure drop) for a 15ft run, 1/2" CSST has a capacity over 80CFH (actual: 185)
Fig. 3-12