Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

1. SUBTASK 70-12-13-200-001 Control of the Slurry

   1. Examine the abrasive content of the slurry after each four hour of operation with the subsequent steps.

      1. Fill three 100 ml or 500 ml graduated cylinders with a sample of slurry as it leaves the gun using a sweeping motion back and forth over the top of the container.

      2. Let the slurry sit for 15 - 30 minutes to let the media collect at the bottom of the graduated cylinders.

      3. Take an average reading from each of the graduated cylinders.

      4. Keep a record of the results in a department log book before the next periodic check.

      5. Keep the abrasive content of the slurry at approximately 10 - 15 percent by volume. Add three ml of corrosion inhibitor for each pound of abrasive added (6.6 ml of corrosion inhibitor for each one kg of abrasive). Add 0.5 oz of anti-solidifying compound for each 6 pounds of abrasive added (5.2 g of anti-solidifying compound for each 1kg of added abrasive).

         1. The corrosion inhibitor is optional if the blasting equipment is made of stainless steel.

         2. It is not necessary to use anti-solidifying compound in blasting equipment from some manufacturers. Refer to the blasting equipment manufacturer's instructions to find if anti-solidifying compound is not necessary.

      6. Record the slurry concentrations and the results of the corrections in the department log book that contains the initial results of the abrasive content check.

   2. Complete change of the slurry and cleaning of the blasting machine to remove sludge and debris from the bottom of the cabinet is required after every 40 hours or sooner of machine operation. The slurry breaks down in time and reduce the effectiveness of the blasting.

      1. Record the date and hours from the machine timer after the slurry is changed. Post the time on the machine for the next scheduled slurry change.