Contracor PBT-1, Руководство по эксплуатации

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8 CONTRACOR
®
Version 7.0
3. General Description
The CONTRACOR PBT-1 Internal pipe cleaner is designed to blast clean the internal
surfaces of pipe ranging in size from 3” to 12” (75 to 300 mm) I.D.
The tool connects to an abrasive blast machine in place of a standard nozzle. In operation,
the PBT-1 nozzle directs the air/abrasive mixture at a deflection tip. This tip causes the
blast pattern to fan out into a wide, circular pattern, which cleans the inside of the pipe as
the tool is passed through.
Two centering devices are available to hold the tool in position during passes.
The PBT-1 tool is made from the finest materials available. However, some of its internal
wear parts are of necessity rather brittle, due to their extreme hardness. The tool should
therefore be handled carefully to avoid dropping it or giving it a sharp blow.
4. Set-Up
4.1 Basic Equipment Required
Use of the PBT-1 tool requires the same equipment as any other abrasive blast cleaning
operation, i.e. an air compressor and an abrasive blast machine.
With the standard 12.5mm PBT-1 nozzle a compressor which can supply ca. 6.5 m³/min at
a pressure of 7 bar at the nozzle is required.
The blast machine should have 1" (25 mm) piping minimum; a machine with 1¼" (32 mm)
piping is recommended.
4.2 Abrasives
The abrasives must be well screened and dry. With the 12.5mm nozzle, use 25 mesh
abrasive or finer.
Any of the common blasting abrasives can be used, although soft sands give poor results
because too much energy is lost in break-up on the deflection tip.
Aluminum oxide and silicon carbide should be avoided unless required by job specifications,
since these abrasives cause accelerated wear.
Steel grit is the ideal medium to use if adequate recovery means are available.