Slant/Fin Galaxy GXH-300H Installation And Operating Instructions Manual page 7

GALAXY
cases has an air vent on the receiver. A gravity return system
has no receiver, so provisions for air removal must be made
on the piping itself. A one pipe system has the air vents on the
radiation, the heat exchanger and near the end of the steam
supply main (see figures 2 and 3).
Main air vents should be located fifteen inches from the drop
and if possible eight inches above the pipe so that water
hammer does not damage the vent and render the vent
inoperable.
For more information on air vents, check with any manufac-
turer of steam accessories (steam traps, boiler feed pumps,
air vents, etc.).
E. Process water applications involving steam boilers requires
the use of heat exchangers. Any process application that
constantly uses fresh water into a steam boiler can and will
cause scaling with deposits forming in the boiler and sur-
rounding piping. This will damage the boiler.
F. If valves are used on the supply side of the boiler, the valve
port opening must be the same size as the surrounding
pipe. (Full flow type valves.)
G. Piping should provide a means of cleaning and flushing the
heating system of the sediment for safe, efficient operation.
RECOMMENDED PIPING FOR A ONE PIPE PARALLEL
FLOW LOW PRESSURE STEAM HEATING SYSTEM WITH A
WET OR DRY GRAVITY (See Note No. C under "Piping a
low pressure steam boiler") CONDENSATE RETURN AND A
HARTFORD† LOOP .
See Note No. A on page 6 under "Piping a low pressure
steam boiler".
FIGURE 1
HEADER 64 mm × 305 mm
(2 / "×12") CENTRE TO CENTRE
1
2
64mm (2-1/2") Supply
457mm (18") Minimum Height
400 mm
(15-3/4")
648 mm
(25-1/2")
337 mm
(16-1/2")
† A Hartford Loop is recommended for low pressure steam systems with
gravity condensate returns.
Pipe sizes shown above for Hartford Loop are recommended by
Slant/Fin. However, certain local codes may require larger pipe sizes.
Consult with local authorities.
The equalizer should be full size from the steam supply to the operating
water level.
* Hot water fill is preferable. For auto feedings, see manufacturer's techni-
cal instructions.
64 × 64 × 64 mm
(2-1/2 × 2-1/2 × 2-1/2") TEE
64mm (2-1/2") UNION
64 × 38 × 38 mm
(2-1/2 ×1-1/2×1-1/2") TEE
51 mm (2")
38 mm
(1-1/2") Cross
32 mm (11/4")
Nipple
38 mm (1-1/2")
Nipple
38mm (1-1/2")
Union
38 × 32 mm
(1-1/2" × 1-1/4") 38mm (1-1/2")
Reducing
Plug
Coupling
38× 19 mm
(1-1/2 × 3/4")
Bushing
FIGURE 2
457 mm (18") Minimum Height
400 mm
(15-3/4")
648 mm
(25-1/2")
419 mm
(16-1/2")
* Hot water fill is preferable, but not required. For auto feeding, see manu-
facturer's technical instructions.
** See item B, page 6, under "Piping a low pressure steam boiler"
FIGURE 3
457 mm (18") Minimum Height
400 mm
(15-3/4")
648 mm
(25-1/2")
419 mm
(16-1/2")
Counter flow piping is sized one pipe size larger than a parallel flow piping.
This allows steam to travel in one direction while the condensate travels in
the other direction. This along with a steeper pitch is a must for safe, effi-
cient operation.
** See item B, page 6, under "Piping a low pressure steam boiler"
381
mm
(15")
**
51 mm (2")
**
7
203
mm
(8")