Steam Coils are generally manufactured for horizontal airflow. If the
coil is to be mounted in a vertical duct, or the airflow is other than
horizontal, this must be specified when ordering.Wherever possible Steam Coils should be installed with the primary tubes
vertical. Should the application necessitate horizontal primary tubes,
they will be sloped within the casing to improve condensate drainage.
This arrangement must however be specified at the enquiry stage.
Steam Coils are available in depths of one and two rows. Greater depths
are obtainable by bolting multiples of one and two row sections back to
back.Alternate rows are staggered, to obtain maximum heat transfer.Heat Transfer Surface
The primary tubes are manufactured from solid drawn seamless copper
tube.Fins are of the smooth plate type produced from aluminium, vinyl coated
aluminium or copper and are punched with self spacing collars. Plain
tube coils are available for anti-frost applications or where the
pre-heating of unfiltered air is required. Inner steam distributor tubes
can be fitted with the primary tubes for preheat applications where the
air temperature falls below freezing, or where a uniform temperature
across the face of the coil is essential.
|The primary tubes are
mechanically expanded into the pre-formed collars thus assuring a good
metallic bond between the fins and tubes. This results in uniform heat
transfer with guaranteed performance throughout the life of the coil.
The tubes are brazed or silver soldered into copper steam and condense
headers each provided with a B.S.P. screwed male connection. Flanged connections are available on request.
The heating surface is housed in a casing produced from galvanised sheet
steel. Where the primary tubes pass through the casing, smooth belled
holes are provided to permit freedom of movement for expansion and
contraction. The casing is produced in channel and tray formation
suitably stiffened to prevent distortion. The flanges formed by the
casing sections can be drilled for attachment to adjacent components on
All Steam Coils are subject to an air under water test of 2000 kPa.
Where higher working pressures or extreme temperatures are involved
coils can be tested up to 3500 kPa or twice their working pressure. Finish
Coils with a galvanised steel casing are generally supplied unpainted
but special finishes are available on request.