Brochure

Gastite Division, Titeflex Corporation
1116 Vaughn Parkway / Portland, TN 37148
800.662.0208 / www.gastite.com / [e-mail]
27
April 2015
Section 3: System Configuration
3.2.6 Example 5 - Multiple Manifold System
Figure 3-13 below shows the same house and similar piping system as Example 4. e piping is arranged in parallel fashion,
with individual CSST appliance runs supplied by two distribution manifolds. Regulators are mounted at each 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 regulators are set
to 8"WC. Downstream of the regulators 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 regulators the 2 PSI line pressure chart with a
pressure drop of 1 PSI can be used. is will supply the regulators with the 1 PSI inlet pressure required for full capacity flow.
Sizing of all appliance runs downstream from the pressure regulators is performed considering the length and load for each
appliance as in the previous example.
To size the elevated pressure trunk lines, use the Longest Run Method to determine the trunk line sizes by adding the
distance from the meter to the furthest regulator (trunk “A” + trunk “E”). is length is used to size both trunk lines. It
important to note that the total load of the system is passing through trunk “A” while only the load of the second manifold
system is passing through trunk “E”.
Table 3-6
Section Description Load Delivered by Section Section Length Run Length Tube Size
“A” – Trunk 221 CFH = 221,000 BTUH 45 feet 65 feet 1/2" CSST
“E” – Trunk 53 CFH = 53,000 BTUH 20 feet 65 feet 3/8" CSST
Longest Run for Trunk Section = Distance from meter to furthest regulator.
Appliance runs are determined using the length and load for each section only.
SIZING RUN “A”
• Run “A” is sized by the load of all appliances and the run length from the meter to the farthest regulator
• e total load of all appliances is 80 + 36 + 52 + 28 + 25 = 221CFH
• e run length to the farthest regulator is 45 + 20 = 65ft
• Referring to Table 7-10 (2 PSI with a 1 PSI drop): for a 70-ft run, 1/2" CSST has a capacity over 221CFH (260 actual)
Fig. 3-13