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Home My WebLink About306.023 - Paragun Rescue Air ChiselEffective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 1 of 6 300 Training and Equipment Manual SECTION 306.023 PARAGUN RESCUE AIR CHISEL PURPOSE The purpose of this policy is to provide Fresno Fire Department (FFD or Department) members with guidelines for the safe operation of the Paragun Rescue Air Chisel. APPLICATION Contents of this policy apply to all members while operating the Paragun Rescue Air Chisel for maintenance, training, or during emergency operations. OPERATIONAL POLICY This section intentionally left blank. OPERATIONAL GUIDELINE General Safety Precautions: Keep the work area clean when maintaining or repairing the air chisel. Personnel not directly involved in operation or maintenance of the air chisel should keep a safe distance from the work area. Use the proper tool bit for each application. Do not force the tool bit during operation of the air chisel. Wear proper PPE and eye protection. Use a respirator in contaminated environments. During operation, do not overreach, always keep stable footing and balance. Do not carry the air chisel by the oiler hose. Never point the air chisel toward yourself or other personnel. Serious injury or possible death could result. Fresno City Fire Department Effective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 2 of 6 PROCESS 1. Operation of Air Chisel: AR2/Panther has the Paragun rescue chisel stored in the back of the apparatus in the left side compartment. There is an air bottle in the storage bag and there are also spares in the wheel well bottle storage compartments. a. Remove from the storage container. If the oiler and hose assembly is not connected, firmly attach the oiler and hose assembly to the air chisel handle. Do not carry the air chisel by the oiler hose. Verify the lubricant level in the oiler is proper (one-half full). If necessary, fill the oiler half- full of Marvel ®, Air Tool Oil. Check the regulator to make sure it is attached to the bottle tightly (it can come loose from bouncing around in the apparatus). See (Figures 1 and 2). (Figures 1 and 2) b. Select the proper tool bit for the specific work to be accomplished. The tool bits are 0.401” (10.2 mm) shank diameter made from heat treated S-7 tool steel. Pull back the tool retainer release ring, insert the tool bit fully into the retainer body and release the ring. The release ring should be in the fully forward position. See (Figure 3). (Figure 3) c. The air chisel is designed to operate on air pressures between 40 and 200 psi (2.8 to 13.8 bar). For maximum efficiency, use only the Effective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 3 of 6 operating pressure to accomplish the task, excessive pressure can hinder the actual operation and result in excessive operator fatigue. Refer to (Table 2-1 and 2-2) for starting point pressures and recommended tool bits. Adjust the air supply pressure regulator for the desired pressure. Do not exceed the maximum operating pressure of 200 psi (13.8 bar). Connect the air supply to the oiler and hose assembly and turn on the air supply line valve to apply air pressure to the air chisel. d. Do not “trigger (operate) the air chisel unless the tool bit is held firmly against the work surface or damage to the air chisel can result. e. With the tool bit installed, hold the air chisel firmly against the work surface. f. Pull the trigger level to operate the air chisel. If recoil (air chisel backs off work surface) is experienced, reduce the operating pressure until the air chisel can be held firmly against the work surface. (Table 2-1 and 2-2) Effective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 4 of 6 2. Shutdown: a. At the conclusion of its use, shut off the external air supply. b. Hold the tool bit against a working surface and pull the trigger lever to dissipate air in the supply line. c. Disconnected the air supply line from the oiler connection. d. Perform the after-use maintenance and slow the air chisel in its storage case in a dry environment. 3. Maintenance: The air chisel requires little maintenance to ensure optimum performance. a. Keep the exterior of the air chisel clean of all dirt and grit accumulations. Wipe exterior surfaces with a lint-free cotton machinery wiping towel lightly dampened with clean water. Then dry the surfaces thoroughly with clean, dry, lint-free cotton machinery wiping towels or low pressure compressed air. Compressed air is used for cleaning in less accessible areas. b. If the air chisel has been operating in a dusty, abrasive environment or an environment when the tool retainer assembly is subjected to a damp or wet material, immerse the air chisel vertically with the tool retainer assembly facing down into a container of dry cleaning solvent (Specification P-D-680, Safety or Stoddard’s Solvent) and agitate the air chisel up and down in order to clean all debris out of the tool retainer assembly. When clean, apply a thin coating of Marvel ®, Air Tool Oil, to the tool retainer assembly, pulling the release ring back and forth while applying the lubricant to assure lubrication of the spring and balls. c. Do not paint any components of the air chisel. Check for loose hardware and cracked or deformed parts. Check for O-ring seal leakage in a static (non-operating) and dynamic (during operation) condition. d. During operation, verify oil mist is present in the air coming out of the valve body exhaust ports. Check for air leakage at juncture of handle and cylinder, handle and shuttle valve assembly, and shuttle valve assembly and cylinder. Any leakage of air or oil at these mating interfaces denotes either a loose connection (tighten hardware) or a defective O-ring seal that necessitates replacement. Note: If any defects are found the hoist shall be immediately placed out of service, tagged with Administrative Manual Section 106.048, Wired Tag (FD-37) and sent to the Shop. Effective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 5 of 6 INFORMATION Specifications: The air chisel is a portable, pneumatic impact tool designed for forcible entry (piercing, cutting, and breaking) during firefighting and rescue operations. The air chisel is also designed for medium duty breaking/breaching of masonry walls digging/tunneling operations. The air chisel employs operating pressures of 40 to 200 psi (pounds per square inch) depending upon the material to be broken, cut or penetrated. Operating air can be obtained from any air source such as an air compressor or a SCBA (self- contained breathing apparatus) air cylinder. Conservation of operating air is achieved through air utilization only on the power stroke with virtually no air loss. An integrated spring retracts the piston on the return stroke. The 3.926-inch stroke provides very high impact energy for the size and weight of the air chisel. The air chisel is designed to use 0.401” shank diameter tools made from S-7 tool steel. Manufacturer, Paratech Air Chisel Part Number, 550000G2 Overall Length, 21.20” (538.5 mm) Overall Width, 7.33” (186.20 mm) Overall Thickness, 1.85” (47.00 mm) Overall, Weight, 6.78 lbs. (3.08 kg) Operating Conditions Power Output: 71 ft-lbs. @ 50 psi to 369 ft-lbs. @ 200 PSI Operating Pressure: 40 to 200 psi Air Consumption (@ 40 psi): 5 (cfm) Air Consumption (@ 200 psi): 15 (cfm) Blows/Minute (Approximate) 1600-1700 Piston Stroke 3.926” Cylinder Bore, 0.875” Hose Size, 3/8” Effective Date: July 2022 Michael S’Gro, Firefighter Current Revision Date: 7/25/2022 Section 306.023 Next Revision (1) Date: 7/25/2024 Page 6 of 6 (Figure 4) DEFINITIONS This section intentionally left blank. CROSS REFERENCES Administrative Manual Section 106.048, Wired Tag (FD-37) Extension Hose Regulator Air Cylinder Air gun Tool Bit Oiler and Hose Assembly