clemco news

Slow down, Live longer

In any pressure blast system, blast hose ID should be three or four times the ID of the nozzle orifice.

This well-known rule of thumb serves two purposes – it prolongs the life of the blast hose and it helps maintain pressure at the blast nozzle.  With a ½-inch ID blast hose feeding a ½-inch orifice nozzle, the abrasive particles will scream through the hose at the same rate as they exit the nozzle – roughly 400 feet per second.  Along the way, the high-speed particles abrade the inner tube, which causes blast hose failure.

If you switch to a blast hose with twice the ID (1 inch), the media velocity drops to one- fourth – or about 100 feet per second – still plenty fast and still destructive to the inner tube.

Trebling the blast hose ID to 1 ½-inches reduces particle velocity to a much less destructive 45 feet per second – although the abrasive still exits the nozzle at a brisk 400 feet per second.  And, the 1 ½-inch blast hose will maintain blast pressure at the ½-inch nozzle, even as the orifice wears to 9/16 inch.

The bigger blast hose will cost more up front, but will last longer than a hose that’s too small.  Always use only as much blast hose as you need and minimize the number and severity of bends.  Abrasive particles tend to wear the inner tube more quickly wherever the blast hose bends.

© Clemco Industries Corp.


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