Black pipes are made to the Kenya Bureau of Standards specification KS06-259:1998 or the equivalent British International Standard BS:1387. They can be plain or bevel ended depending on the application. These pipes are meant for the conveyance of water, compressed air ad fluids. They are also used for water borehole casting pipes. They restrict the collapse of overburden soil. Slots are cut on the pipes for screening purposes depending on the application. Tononoka Steels Ltd uses the highest quality of Hot Rolled Coils (HRC) for this purpose. The HRC is slit suitably and fed into the most modern pipe rolling mills. Gradually the mill shapes them from flat strips to the required circular pipe profile while the edges are prepared for high frequency welding. The bead is then cleaned for residual bead height with a carbide scraping tool online. A flying shear then cuts the pipe to the exact length required. The pipes are finally end-faced and hydro-tested on a special machine at a pressure of 50kg/cm2 for 15 seconds before being dispatched.