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Coating Industry

Blast-One Weekly Tips
Tip #103
How increasing your blast hose size can increase your productivity

How does hose size affect your nozzle pressure?

In the attached video, three different sized hoses were tested for pressure loss.

  • 1 inch (25mm) hose has 16 psi pressure loss over 50 foot (15m) of 1 inch hose.
  • 1 1/4 inch (32mm) hose has 7 psi pressure loss over 50 foot (15m) of 1 1/4 inch hose.
  • 1 1/2 inch (38mm) hose 2psi loss over 50 foot (15m) of 1 1/2 inch hose.

The difference between the 1 inch (25mm) hose and the 1 1/2 inch (38mm) hose is 14 psi which equals 21% production.

To increase production, you need to increase nozzle pressure. Every 1 psi you increase nozzle pressure is 1.5% increase in production.

Hose Pressure Test
Where do I test the hose pressure if I wish to calculate pressure loss?
  1. Test pressure in the blast hose as close as possible to the blast pot
  2. Test pressure again in the blast hose as close as possible to the nozzle
  3. Calculate difference to work out efficiency loss

NB: Always insert needle at 45 degree angle with the needle pointing towards the nozzle to prevent it filling up with sand.

Remember: every 1 psi below 100 psi at the nozzle decreases your production efficiency by 1.5%! This means that if your nozzle pressure drops from 100 psi to 90 psi you’ll take 15% longer to achieve the same amount of work!

Conversely, increase in pressure above 100 psi will show an increase in efficiency by 1.5%.

Pressure Loss Chart

Actual efficiency increase/decrease will vary depending on abrasive type and size, nozzle type, size and wear, temperature, moisture content of compressed air, etc.



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