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Projectile Usage

In the hydraulics industry, exhaustive tests have proved that contamination is the cause in k70% of hydraulic failures. University tests have proved cutting of tube and hose with a steel cutting disk introduces 800-1200 micron particles with a weight of 30-50 milligrams in a 1 metre length of hose. Compri Technic have looked at the varying levels of cleanliness required in the hydraulics industry and determined the projectile usage to reach these levels. 
To obtain recommended levels of cleanliness when manufacturing an assembly please refer to the chart below. Standard projectiles should be fired from either end of the hose or tube. After fitting the couplings, further coupling projectiles should then be fired through to ensure any possible contamination introduced during manufacture (lubricants, etc.) are removed. 
University tests have demonstrated that standard projectiles remove larger size contaminants and absorb fluids, whilst coupling projectiles remove the smaller particles.   

Level

Example

Projectile Usage

1

Common control valves and intake lines from reservoirs to filters.  1standard projectile through hose.
1coupling projectile through assembly.

2 & 3

Intake lines to pumps. Pressure lines from motor valves to cylinders. 2 standard projectile through hose.
1coupling projectile through assembly.

4

Hydrostatic drive lines, servo control lines, aircraft lines. 2 standard projectile through hose.
2 coupling projectile through assembly.

Tubing should use 1 or 2 abrasive projectiles before following the above procedures.
 
In other application such as boiler tubes and heat exchangers, the physical properties and distribution of the material to be removed influences the type of cleaning action required, hence the choice of projectile. In many cases a range of different projectiles will be used in succession to provide the optimum cleaning action. Standard and coupling projectiles should always be used after abrasive or grinding projectiles to remove any resulting contamination.

 
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