Importance

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Abstract

A blasting device for cleaning the inner surface of a hot deformed pipe end has a blast lance of inner and outer coaxially aligned tubes which connect with a blast nozzle head having nozzles. Injectors on the inner tube direct carrier medium and abrasive in an annular chamber between the inner and the outer tubes, through the nozzles. An axial pipe coaxially disposed in the inner pipe carrier further carries medium through the blast nozzle head and a deflector attached to the blast nozzle has radially extending passageways that direct the same through the periphery of the blast nozzle head to provide a gas curtain to protect the undeformed pipe section from abrasive. A removeable heat resistant element is attached to the deflector to further protect the undeformed section of the pipe.

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First Claim