• Installation | • | • Maintenance | • Parts |
6a Connect Steam Boiler Piping
General steam piping information:
•Hartford Loop piping arrangement and wet return are required for steam boilers.
•Maintain
•When using condensate receiver, feed pump must be energized by
Cold | Check |
|
water fill | Water meter | |
| valve |
Manual isolation
valve
Pressure
reducing valve
(when used) |
| To condensate |
| return piping or | |
| Manual | |
| condensate | |
| isolation | |
| receiver | |
| valve | |
| (see fig. 18, | |
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| page 17) |
Figure 14 Cold Water Fill Piping |
Install piping:
Install piping as shown on page 16 for single boilers, page 18 for multiple boilers.
Improperly piped systems or undersized piping can contribute
to erratic boiler operation and possible boiler or system damage. Piping system must be installed as shown, using pipe sizes shown. Consult local Weil- McLain distributor or sales office before installing alternate piping.
1.Connect supply and return piping:
a.See table below and:
1)Size forced condensate return piping by pump.
2)Size gravity condensate return same as equalizer “J” pipe size.
b.Install system drain valve in lowest part of return piping close to boiler. ASME size requirements are shown in Table, page 13.
c.Connect cold water fill piping as shown in Figure 14. Also shown are recommended valves and water meter, if used. Water meter will detect added makeup water, indicating leaks in system.
Steam Boiler Pipe Size Table
Based on 2-Pipe Steam System
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| *Riser |
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| Pipe Size - In. |
| H | J | ||
Fig. | Boiler |
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| Header | Equalizer |
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No. | Model | A |
| B |
| C | In. | In. |
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15 | 378 | 3 |
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| 3 | 2 |
15 | 478 | 4 |
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| 4 | 2 |
15 | 578 | 4 |
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| 4 | |
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16 | 678 | 3 |
| 3 |
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| 4 | |
16 | 778 | 4 |
| 4 |
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| 4 | |
16 | 878 | 4 |
| 4 |
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| 4 | 3 |
16 | 978 | 4 |
| 4 |
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| 6 | 3 |
17 | 4 |
| 4 |
| 4 | 6 | 3 | |
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* Based on ASHRAE Handbook recommendations, allowing 1/2 oz. pressure drop per 100 feet of pipe for dry return.
**Based on ASHRAE Handbook recommendations, allowing 2 oz. pressure drop per 100 feet of pipe at 3.5 PSIG. Maintain minimum 24" height from waterline to header.
Part No. | 15 |