EC-1 E-Coat Dip Tank — Rectifier and Tank Entry Isolation
Anode replacement and tank entry on an electrocoat dip line. Covers the DC rectifier bus, the overhead conveyor carrying bodies over the tank, circulation and heat exchange, and the ventilation that must stay live in a solvent atmosphere.
How Setyr addresses Automotive andManufacturing →
It refers to equipment that does not exist and illustrates the elements 29 CFR 1910.147(c)(4)(ii) requires a procedure to contain. It is not a document to adopt. Under (c)(4)(i) the employer must develop and document energy control procedures specific to their own machines, and under (c)(6) must inspect them at least annually.
12 points, in sequence
Rectifier AC supply breaker, 480V feeding the e-coat DC rectifier.
Method: Open, lock, prove dead on the AC side.
Caution: Isolating AC does not discharge the DC bus or the tank itself.
Rectifier DC output bus to the anode cells, 350V DC at high current.
Method: Open the DC bus disconnect, allow the bus to discharge, then prove dead at the anode busbar.
Caution: The bath is a conductor. A DC bus that has not been proved dead makes the whole tank live to anyone reaching into it.
Anode cell isolation links at each cell along the tank.
Method: Open each cell link and lock the bank. Prove dead cell by cell, not just at the bus.
Caution: Cells retain charge individually. Proving the bus dead does not prove each cell dead.
Overhead power-and-free conveyor drive carrying bodies over the tank.
Method: Open, lock, and prove dead at the drive.
Caution: A body indexing over an open tank with crew inside is the failure this point prevents.
Mechanical carrier stops set either side of the tank on the conveyor rail.
Method: Set stops both sides and confirm engaged. Must be ENGAGED.
Caution: The conveyor is on a grade. Isolating the drive does not stop a carrier already rolling.
Bath circulation pumps and the eductor loop.
Method: Open and lock both circulation pump disconnects.
Caution: Circulation keeps solids suspended. It also creates flow that will pull a person against the eductor intake.
Ultrafiltration skid feed and permeate return valves.
Method: Close and lock both valves.
Caution: The UF skid returns permeate to the tank under pressure from a separate room.
Bath heat exchanger hot water supply and return.
Method: Close and lock both valves, then allow the bath to cool below the entry temperature and confirm at two points.
Caution: Bath temperature is a burn and heat-stress hazard. Cooling takes time that crews compress under line pressure.
Deionised water rinse header over the tank.
Method: Close and lock the header valve.
Caution: Rinse headers fire on a timer tied to the conveyor, not to the tank.
Tank exhaust ventilation over the bath.
Method: Do NOT isolate. Confirm exhaust flow is above the low-flow setpoint before entry.
Caution: Solvent vapour above an e-coat bath is both a health hazard and a flammable atmosphere.
Flammable atmosphere monitoring at the tank rim and on entrants.
Method: Do NOT isolate. Confirm LEL monitoring is in service.
Caution: Entry into a tank that held solvent is permit-required regardless of how empty it looks.
Tank deluge and foam suppression over the dip tank.
Method: Do NOT isolate. Confirm the suppression valve is open and sealed.
Caution: Hot work near a solvent tank with suppression isolated is how the tank becomes a fire.
What your site must supply
This example is structurally complete and factually generic. The things below are the things only you can know — and they are exactly what makes a procedure yours.
- Your own asset and isolation-point tag numbers. The tags shown are illustrative and refer to equipment that does not exist.
- The actual location of every disconnect, valve and vent on your equipment.
- Measured stored-energy magnitudes and the dwell time required to dissipate them.
- Your verification method for each point, and who is authorised to perform it.
- Any additional energy sources present on your equipment and absent here.
Author this properly, once
Setyr holds procedures like this as living documents — bound to real isolation points, with lock registries, group lockout, person-in-charge custody and periodic review built in.