CCI Thermal Technologies AV - Advanced Vertical Unit Heater - Manuel (Page 5)

5
PIPING APPLICATIONS
1. For steam service use only single-pass heaters.
Refer to Model Coding Section for tube-side pass
designation.
2. Refer to figures 4-6 for typical piping applications.
3. To prevent condensate from entering the heater, slope
steam supply lines toward the steam main. In long
supply lines, drip traps may be needed.
4. For steam systems, use properly sized continuously
draining steam traps, such as float or thermostatic
types. Traps must be sized to handle start up and
operational flows.
5. If the condensate return main is above the heater
outlet or is pressurized, install a check valve after the
steam trap and a drain valve at the strainer to drain
the system during the off season.
6. Allow for efficient condensate drainage and sub-
cooling by maintaining the outlet pipe size between
the heater and steam trap. Provide at least a 10 inch
(254 mm) drop leg at condensate outlet.
7. In horizontal steam and condensate lines use
eccentric reducers only.
8. Allow for pipe expansion.
9. Eliminate pipe stress by adequately supporting all
piping. Do not rely on heater to support piping.
10. All piping must be properly sized for expected flow
rates.
11. For more piping information, consult industrial piping
handbooks.
12. Comply with all applicable piping codes.
- 5 -
Unit heater connection for
low-pressure steam,
open gravity or vacuum return system.
Unit heater connections to overhead steam
and return mains.
Unit heater connections to
overhead liquid mains
FIGURE 4
FIGURE 5 FIGURE 6
NOTES: 1. This piping arrangement is only for two-position-type control.
Modulating steam control may not provide sufficient pressure to
lift condensate to return main.
2. Do not use with fluids corrosive to steel.
3. Install using proper piping practices.
4. In horizontal pipe runs, use eccentric reducers only.
5. Use a properly sized steam trap.
NOTES: 1. For medium to high pressure systems a bucket or float trap
must be used.
2. Do not use with fluids corrosive to steel.
3. Install using proper piping practices.
4. In horizontal pipe runs, use eccentric reducers only.
5. Use a properly sized steam trap.
NOTES: 1. Do not use with fluids corrosive to steel.
2. Install using proper piping practices.
PIPING APPLICATIONS
1. For steam service use only single-pass heaters. Refer to
Model Coding Section for tube-side pass designation.
2. Refer to figures 4-6 for typical piping applications.
3. To prevent condensate from entering the heater, slope steam
supply lines toward the steam main. In long supply lines, drip
traps may be needed.
4. For steam systems, use properly sized continuously draining
steam traps, such as float or thermostatic types. Traps must
be sized to handle start up and operational flows.
5. If the condensate return main is above the heater outlet or is
pressurized, install a check valve after the steam trap and a
drain valve at the strainer to drain the system during the off
season.
6. Allow for efficient condensate drainage and subcooling by
maintaining the outlet pipe size between the heater and
steam trap. Provide at least a 10 inch (254 mm) drop leg at
condensate outlet.
7. In horizontal steam and condensate lines use eccentric
reducers only.
8. Allow for pipe expansion.
9. Eliminate pipe stress by adequately supporting all piping. Do
not rely on heater to support piping.
10. All piping must be properly sized for expected flow rates.
11. For more piping information, consult industrial piping
handbooks.
12. Comply with all applicable piping codes.