B&C Technologies DI-325 Industrial - Manual (Page 19)

INSTALLATION PROCEDURES
3-10
2. Installation Instructions
To insure that an adequate supply of steam is provided, be sure that the steam return lines
are sized and laid out as stipulated in this manual. Inadequate steam and steam return lines or
improper steam plumbing will result in poor performance and can cause component failure. Clean,
dry steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam VOIDS WARRANTY.
a. The pressure of the condensate in the steam supply will cause water hammer and
subsequent heat exchanger (steam coil) failure. The steam supply connection into the
main supply line must be made with a minimum 10 – inches riser. This will prevent any
condensate from draining towards the dryer.
b. The steam supply piping to the dryer must include a 12 – inch rise along with a drip trap
and check valve. This will prevent any condensate from entering the steam coil.
c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and
this will cause the steam coil connections to crack if they are hard piped to the supply and
return mains.
d. Shut – off valves for each dryer should be installed in the supply, return, and drip trap
return lines. This will allow the dryer to be isolated from the supply and return mains if
the dryer needs maintenance work.
e. Install an inverted bucket steam trap and check valve at least 12 inches below steam coil
as close to the coil as possible.
f. A vacuum breaker should be installed in the piping. This will prevent the condensing
steam from causing a vacuum inside the coil and possibly damaging the coil.
g. The supply and return lines should be insulated. This will save energy and provide for the
safety of the operator and maintenance personnel.
h. Water pocket in the supply line, caused by low point, will provide wet steam to the coil
possibly causing coil damage. All horizontal runs of steam supply piping should be
pitched 1/4 – inch for every one (1) foot back towards the steam supply header causing
any condensate in the line to drain to the header. Install a bypass trap in any low point to
eliminate wet steam.