Setyr worked example — LR-6 Truck Loading Rack — Loading Arm and Vapour Recovery Isolation Not approved for use. Version 1 · 2026-09-25
Worked example only — your site must author, review and approve its own
procedure under 29 CFR 1910.147(c)(4). setyr.com/procedures
LR-6 Truck Loading Rack — Loading Arm and Vapour Recovery Isolation
Terminal loading
Loading arm seal replacement at a gasoline truck rack. Covers product header isolation under static head, vapour recovery return, the grounding and overfill interlocks that must stay in service, and hot work in a vapour zone.
This is a worked example, not a procedure you can adopt. It describes equipment that does not exist, with illustrative tag numbers.
29 CFR 1910.147(c)(4) requires the employer to develop, document and
utilise energy control procedures specific to their own machines, and (c)(6)
requires the employer to inspect those procedures periodically. Neither duty
can be delegated to a vendor or discharged by this document.
Isolation points
| # | Tag (illustrative) | Type | Disposition | What it does and why | Dwell |
|---|---|---|---|---|---|
| 10 | LR-6-PUMP | Disconnect | Isolate & lock | Bay loading pump motor disconnect. Open, lock, prove dead at the starter. | — |
| 20 | LR-6-PLC | Breaker | Isolate & lock | Rack terminal automation and the bay preset controller. Caution: Rack automation opens valves on a driver card swipe. A card swiped at the wrong bay starts a transfer into an open arm. Open and lock the bay controller supply. | — |
| 30 | LR-6-PROD-BLK | Valve | Isolate & lock | Product header block valve to bay six, gasoline service. Caution: The header stays under static head from the tank farm whether or not a pump is running. Stopping the pump does not isolate the bay. Close and lock the block valve. Confirm the bay meter shows no flow. | — |
| 40 | LR-6-PROD-BLD | Bleed | Isolate & lock | Bleed between the block valve and the loading arm, to the slops header. Caution: This bleed is the proof that the block is holding against the tank farm head. Open the bleed to slops and lock open. A sustained zero proves the block; a rising pressure means it is passing. | 300s |
| 50 | LR-6-ARM-DRN | Drain | Isolate & lock | Loading arm low-point drain into the closed drain system. Caution: A loading arm holds several litres of gasoline after the header is isolated. It drains onto the crew when the flange is broken. Drain the arm fully to the closed system and confirm flow has ceased. | 240s |
| 60 | LR-6-VAP-BLK | Valve | Isolate & lock | Vapour recovery return line block from the bay to the vapour header. Caution: The vapour header runs at slight vacuum and connects every bay. An open vapour line draws vapour from bays still loading. Close and lock the vapour block valve. | — |
| 70 | LR-6-VAP-PRG | Valve | Isolate & lock | Nitrogen purge connection for the loading arm and vapour line before hot work. Caution: Gasoline vapour sits in the arm above the upper flammable limit. Purging brings it DOWN through the flammable range on the way to safe. Purge the arm and vapour line with nitrogen and confirm LEL below the hot-work threshold on two consecutive readings at the flange. | 600s |
| 80 | LR-6-ARM-STOW | Block | Apply & verify | Loading arm stow latch and counterweight restraint. Caution: The arm is counterweighted and swings under its own balance once the seal is broken. Latch the arm in the stowed position and confirm the counterweight is restrained. Must be ENGAGED. | — |
| 90 | LR-6-GROUND | Switch | KEEP ENERGISED | Bay grounding and bonding verification system with its interlock to the preset. Caution: Static is the ignition source at a loading rack. Bonding is the control and must stay live while the arm is opened. Do NOT isolate. Confirm the grounding verification system is in service and bonded to the arm before any work. | — |
| 100 | LR-6-OVERFILL | Switch | KEEP ENERGISED | Overfill detection and the bay permissive interlock. Caution: Defeating the rack overfill system to work one bay disarms protection on the bays still loading. Do NOT isolate. Confirm the overfill system remains armed for the adjacent bays. | — |
| 110 | LR-6-DELUGE | Valve | KEEP ENERGISED | Rack deluge and foam system over the loading bays. Caution: Hot work at a gasoline rack with deluge isolated removes the only response to ignition. Do NOT isolate. Confirm the deluge valve is open and sealed. | — |
| 120 | LR-6-LEL | Breaker | KEEP ENERGISED | Fixed LEL detection at the bay and personal monitors on the crew. Caution: Vapour is heavier than air and pools at grade under the rack where the crew works. Do NOT isolate. Confirm fixed heads are in service and personal monitors are bump-tested. | — |
What your site must supply
- 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.
Authorship and validation
This example was authored by Setyr for domain validation. It is not derived from any customer's controlled documents. It illustrates the elements 29 CFR 1910.147(c)(4)(ii) requires a procedure to contain — it does not certify compliance, which is a property of an employer's programme rather than of any document.