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Pipe Blasting

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Product Info


PAXAA designs & manufactures fully automated Pipe blasting machines for surface preparation, profiling, removing dust & mill scale from steel pipe.
 
The purpose for pipe blasting is to prepare or clean the steel surface or substrate for subsequent protective coatings applications such as pre-treatment for painting, tar or PE coating, using (predominantly) steel grit & shot blast media to achieve the desired cleanliness and anchor profile required to achieve acceptable coating adhesion. Depending upon the coating specifications required, 40-100 micron surface profile depth can be easily performed. Pipes can also only be blast cleaned alone, immediately prior to load out removing the majority of internal surface corrosion prior to pipe welding either on or offshore.
 

Blasting Equipment Line-up

Four blast machine layouts are common in pipe and tube fabricating:
 

Skew roll machines (Diablo)

Angled V-rolls convey and rotate pipe through the blast cabinet, presenting the parts to the blast wheels several times in the process. The blast wheels are located on the roof of the cabinet. This type of machine is useful for tube, bar stock, and pipe diameters up to 600 mm.
 

Multi-bar machines

Small-diameter bar is conveyed in multiple lines through the blast cabinet. The bar is not skewed as it is conveyed, and passes through without rotating. Therefore, multiple wheels must be positioned around the part to propel blast media at the bar at varying angles.
 

Up-blast pipe machines

These machines feature blast wheels located below the pipe as it passes through the blast cabinet. This means the distance between part and blast wheel is constant, regardless of pipe diameter. This machine can accommodate pipe diameters in excess of 1500 mm.
 

Down-blast pipe machines

This machine type is similar to the up-blast machine, with the crucial difference being that the blast wheels are positioned on the roof of the cabinet. This means that the distance between parts and blast wheels varies as the part diameter varies. The maximum part diameter should not exceed 900 to provide repeatable results.

 

Working Principle

The pipe is conveyed through the blast machine on a specially designed external skew roll type material handling system. An extensive range of high production blast cabinets are available to handle from 150mm to 2500mm diameter pipe at variable cleaning speeds. 
PAXAA pipe machines include an air wash and dust collection system that work together to remove contaminants and fines, control dust and maintain correct abrasive size.

PAXAA works with customers to determine the requirements and will consider many factors, including:

  • Steel abrasive types
  • Profile requirements
  • Surface cleaning requirement
  • Line speed requirement

 As well as working closely with coating manufacturers to assure proper mill profile is achieved to give the best adherence of coating.
 
All PAXAA systems are capable of a standard cleanliness value of SIS S.A. 2.5/ ISO 8501-1, SSPC-SP 10/ NACE No.2, near white metal cleanliness, or a SIS S.A. 3/ ISO 8501-1S, SSPC-SP 5/NACE No. 1, white metal cleanliness, when required for certain applications / specifications.


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