|When steel pipe
is forged, a black oxide scale forms on its surface to give it the
finish which is seen on this type of pipe. Because steel is subject
to rust and corrosion, the factory also coats it with protective
oil. Those black steel are used for manufacturing pipe and tueb,
which will not rust for a long time and requires very little maintenance.
It is sold in standard 21-foot lengths TBE.
|Black steel pipes
and tubes are cut and threaded to fit the job. Fittings for this
type of pipe are of black malleable (soft) cast iron. They connect
by screwing onto the threaded pipe, after applying a small amount
of pipe joint compund on the threads. Larger diameter pipe is welded
rather than threaded. Black steel pipe is cut either with a heavy-duty
tube cutter or cutoff saw or by hacksaw.
Widely applicable for ordinary uses in water, gas, air and stream, black
steel tube and pipes are utilized for gas distribution inside and outside
the house and for hot water circulation in boiler systems. It is also
used for line pipis in oil and pitroleum industries, for water wells and
for water, gas and sewage purposes. It is not used for potable water or
for drain waste or vent lines.
For identifying the steel
pipes in terms of its standard reference and grade, it is often neccessary
to understand the various technical and product specifications. This section
offer guidance on steel pipe specifications, applications and the various
organization and forums imparting detailed information about steel pipes.