AIR ABRASIVE BLAST LINE TRAVEL MACHINE.

摘要

A pipeline treating apparatus (10) is disclosed which is used to clean the exterior of a pipeline (12) with high pressure air with entrained abrasive. The apparatus has an improved classifier and separator to separate the abrasive grit from lighter debris which includes a classifier and separator within a manifold duct (56) which returns the grit to a collection pan (40) for recovery and causes the lighter airborne dust to be removed through a return duct (58). A series of pressure relief filters (82) reduce the air pressure within a blast chamber past the triple seals (76, 78, 80). The blast nozzle assemblies (834) are attached to the nozzle oscillating frames by snap fittings (74) which avoids threaded connections which may become contaminated by the debris.