Saturday, 27 May 2017

GMA Garnet™ provides optimum blasting efficiency and economy if correctly applied.
Here are some guidelines:

  • Ensure the nozzle air pressure is at 95-100psi (measured at the nozzle). Note: for every 1psi under 100psi, efficiency is reduced by 1.5%, i.e. at 70psi, you are blasting at 55% efficiency.
  • Check nozzle pressure frequently with a hypodermic needle gauge.
  • Check nozzle frequently for wear and replace when worn to maintain optimum productivity.
  • Check all blast pot fittings, hoses and hose couplings, both air and air/abrasive and repair anything that is faulty immediately. Any air leak will cause a loss in pressure at the nozzle.
  • Use an efficient moisture removal system to prevent pressure drop. Old style moisture traps severely restrict airflow.
  • Fit an abrasive valve that can accurately meter the abrasive flow to ensure correct air/abrasive mix in the blast hose, as accurate abrasive metering is very important.
  •  Ensure all blast pots are supplied by an air hose that has a minimum id of 40mm (1 1/2″) preferably 50mm (2″). This hose must be fitted with non-restrictive coupling fittings.
  • The air piping on your blast pot must be a minimum of 32mm id (1 1/4″). Be sure that full port ball valves are used on the choke valve. Do not use reduced port valves anywhere in the system as a pressure drop will occur due to restricted air flow through the ball valve.

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