Example – Assume that a T300 is to be installed in a heating system along with an indirect water heater as shown in
Figure 8.3. A total of 15 ft of straight pipe will be installed between the boiler and the primary loop. A total of 25 ft of
straight pipe will be installed between the boiler and the indirect water heater. Of this 25 ft of straight piping, 10ft is
common to both the secondary and indirect water heater loop. This indirect water heater requires a flow rate of 8 GPM
and has a head loss of 3.0 ft. 20GPM is required through the secondary loop.
Total fittings in Secondary loop (“boiler loop”):
4 90 Elbows
2 Runs of Tees
1 Swing Check
2 Isolation Valves
Note: Unions, Secondary Connection Tees, and factory supplied fittings are ignored.
We would prefer to use 1-1/2” piping. Based on this, calculate total equivalent length from Table 8.6:
15ft Straight Pipe + 4 Elbows x 4.5 + 2 Runs of Tees x 2.8 + 1 Swing Check x 12.5 + 2 valves x 1.0 = 53.1
Equivalent Feet Straight Pipe. From Table 8.5, we see that a Taco 0012 will pump 20 GPM through a T300 with 89
equivalent feet of 1 1/2” pipe, so Taco 0012 will work in this application with 1 1/2” piping.
Total fittings in Indirect Water Heater Loop:
4 90 Elbows
2 Turns in Tees
1 Swing Check
2 Isolation Valves
All options shown in Table 8.7 for the indirect water heater show the use of 1” I.W.H branch piping. Although there is
10ft of piping common to both loops which is 1-1/2”, we calculate the equivalent length for the I.W.H. loop as though it
were entirely 1”. Therefore, the total equivalent length for the I.W.H. loop is calculated from Table 8.6 as:
25 Straight Pipe + 4 Elbows x 2.8 + 2 Turns in Tees x 5.5 + 1 Swing Check x 7 + 2 valves x 0.6 = 55.4 Equivalent
36
Figure 8.2: Piping Method #1 - Heat Only
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