Safe, effective oven operation requires more than just hitting a switch. Regularly inspecting and testing your oven's safety controls should be a regular part of your oven safety procedures. And, of course, the first step in any maintenance process is to review and adhere to all safety and maintenance bulletins in your oven's maintenance manual. Here are 10 more tips to follow.
TIP 1: Don't OverloadDo not load the oven with more combustible solvents than what the oven was designed to handle. The maximum solvents load is stamped into the oven data plate mounted on the main control panel.
TIP 2: Purge, Purge, Purge and Purge AgainBe sure the oven purge time, prior to ignition, is at least as long as shown on the oven data plate. The minimum four to six volume air changes required for purge before shutoff should not be reduced by modifications or additions to the oven.
TIP 3: Don't Block Pressure-Relief Doors and PanelsVenting is critical in preventing injuries and reducing the amount of damage an oven sustains should an explosion occur. The oven enclosure should be able to withstand the rapid expansion of gases and allow the work openings, relief panels and doors to immediately relieve pressure. Neither modifications nor additions should be made to the oven that would interfere with the pressure-relief operation of doors, wall panels or roof panels. Also, be sure your operators know why it is important not stand in front of or block pressure-relief doors or loading doors during startup and operation of the oven.
In addition, oven doors that utilize pressure latches for pressure-relief style doors must be inspected and maintained according to the manufacturer's suggestion sheet.
TIP 4: Re-Evaluate When You Modify Equipment or ProcessModifications to existing oven equipment or any process change resulting in increased solvent introduction (such as increased coating weights, coating formulation changes or increased production) will require re-evaluation of the solvent introduction to the oven relative to compliance with the 25 percent (or less) lower explosive limit (LEL) concentration requirement of insurance underwriters and/or the NFPA 86 standard.
TIP 5: Avoid Production Pressure PitfallsDon't let production pressures convince you to bypass safety devices or neglect regular maintenance.
- Do not jumper the electrical circuit of any safety devices. If a safety device is not functioning properly, find the cause and correct it.
- On all gas- or oil-fired ovens, close the manual fuel cocks in the piping train whenever the burner is shut off.
- Visually inspect combustion air filters, where applicable, and clean or replace on a regular basis.