New Jersey Administrative Code
Title 12 - LABOR AND WORKFORCE DEVELOPMENT
Chapter 190 - EXPLOSIVES
Subchapter 7 - USE OF EXPLOSIVES
Section 12:190-7.23 - Pneumatic loading of explosives

(a) Pneumatic loading equipment shall be constructed of materials compatible with the type of explosive materials to be used.

(b) Pneumatic loading equipment shall be used according to the recommendation of its manufacturer.

(c) A positive grounding device shall be used to prevent the accumulation of static electricity in the system. The ground shall be separated from any water line, air line, rail or permanent electrical grounding system.

(d) The air supply hose shall be nonconductive.

(e) The discharge hose shall be semi-conductive.

(f) All systems shall be evaluated by a competent person to insure that they will adequately dissipate static under potential field conditions.

(g) The compressed air supply shall be free of solid particles greater than 20 mesh size.

(h) The air pressure to the pneumatic loader shall not exceed the recommendations of the manufacturer. If necessary the supply shall be controlled by a pressure regulating valve in the air supply line. A pressure relief valve set at 10 percent above the loader's operating pressure shall be placed in the line ahead of the regulating valve.

(i) The temperature of the air supplied to the pneumatic loader shall not exceed 150 degrees F.

(j) When electric detonators are used, the leg wires shall be placed outside the discharge hose and kept away from the metal parts of the loader.

(k) The pneumatic loader shall not be used to place stemming in the blast hole.