Brochure

Gastite Division, Titeflex Corporation
1116 Vaughn Parkway / Portland, TN 37148
800.662.0208 / www.gastite.com / [e-mail]
29
April 2015
Fig. 3-14
Section 3: System Configuration
3.2.7 Example 6 - Series System – 7"WC - Hybrid
Figure 3-14 below shows a typical single-family house retrofit installation with five (5) appliances, 2 of which are added
onto an existing black pipe system. e piping is arranged in series with a main run branching at the appliances. e utility
company’s supply pressure (downstream of the meter) is 7"WC. 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 allowable pressure drop across the system
has been determined to be 2.0"WC (supply pressure 7"WC - appliance requirement 5"WC).
Note: Rigid pipe sized using a 0.5"WC pressure drop table, as no 2.0"WC pressure drop table for Rigid pipe is available.
Table 3-7
Section Description Load Delivered by Section Section Length Run Length Tube Size
“A” – Rigid Trunk 221 CFH = 221,000 BTUH 40 feet 70 feet 1" Rigid
“B” – Rigid Trunk 141 CFH = 140,000 BTUH 5 feet 70 feet 1" Rigid
“C” – Rigid Trunk 105 CFH = 105,000 BTUH 10 feet 70 feet 3/4" Rigid
“D” – CSST Trunk 53 CFH = 53,000 BTUH 10 feet 70 feet 1/2" CSST
“E” – BBQ 25 CFH = 25,000 BTUH 5 feet 70 feet 1/2" CSST
“F” – Furnace 80 CFH = 80,000 BTUH 10 feet 50 feet 3/4" Rigid
“G” – Water Heater 36 CFH = 36,000 BTUH 10 feet 55 feet 3/8" Rigid
“H” – Range 52 CFH = 52,000 BTUH 10 feet 65 feet 1/2" Rigid
“J” – Dryer 28 CFH = 28,000 BTUH 5 feet 70 feet 1/2" CSST
Run Length for Trunk Sections = Distance from meter to furthest appliance (Longest Run)
Run Length for Appliance Sections = Distance from meter 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 furthest appliance
• e total load of all appliances is 80 + 36 + 52 + 28 + 25 = 221CFH
• e run length to the BBQ (furthest appliance) is 40 + 5 + 10 + 10 + 5 = 70ft
• Referring to Table 7-23 (Rigid pipe 0.5"WC pressure drop): for a 70ft run, 1" Rigid pipe has a capacity over 221CFH
(actual: 240)
SIZING RUN “B”
• Run “B” is sized by the total load of all supplied appliances and the run length from the meter to the furthest appliance
• e total load of the supplied appliances is 36 + 52 + 28 + 25 = 141CFH
• e run length to the BBQ (furthest appliance) is 40 + 5 + 10 + 10 + 5 = 70ft
• Referring to Table 7-23 (Rigid pipe 0.5"WC pressure drop) for a 70ft run, 1" Rigid pipe has a capacity over 141CFH
(actual: 240)