181146
| Question | Answer |
| 2 and 3 Am Cutting Head | Swing arms are spring loaded keeping the cutting arms in contact with the tube surface. Used for sizes 5 - 7.6cm on a 15cm min. radius |
| Rotary Driven Wire Brush | Flexible holder allows it to function on curved tubes. |
| Air Motor Attached to a Cutting Head | Powered by compressed air and turns the cleaning head. The flexible coupling between the driver and the cutting head make it suitable for curved surfaces. |
| Fire Tube Air actuated cleaning tool | Moves inside the tubes @ 5m / min. Scrubs the inside of the tubes with a pulsating action. |
| Chemical cleaning advantages | - Less time and fewer maintenance personnel required. - Inaccessible areas can readily be cleaned and cleaning is more thorough - Boilers can be designed without provisions for mech. cleaning accessibility |
| Chemical cleaning | Cleans scale from low pressure boilers. Cleans the major deposits of magnetite and copper. |
| Chemical cleaning agents | Ammoniated Citric Acid with an oxidizing agent (sodium nitrate or bromate to remove magnetite and copper. Mild hydrochloric acid (5% acid / water solution) is also used. |
| Chemical Cleaning | Produces hydrogen gas. NO SOURCES OF IGNITION in vicinity of boiler. After chemical cleaning the unit is opened, and air is circulated through the unit to remove hydrogen gas. |
| Ammonia | Corrodes bronze and brass. |
| Preparing for chemical cleaning | Valves closed, connections blinded off, fill sections of the boiler with demineralized water (ie. superheater), gauges and meters are isolated from the unit, vents are open to remove any acid vapours formed. |
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