Refrigerant Inventory and Cylinder Tracking for the Shop

Purpose

The recovery SOP tracks one cylinder through one job. This one tracks every cylinder the shop owns across a month, and it exists because three separate problems all show up in the same ledger.

The first is regulatory: Section 608 recordkeeping asks what came in, what went out and where it went, and a shop that keeps per-job notes without a running total cannot answer that in one place. The second is safety: once the rack holds both A1 and A2L cylinders, the register is what says which is which when a label gets scuffed, and a cylinder past its hydrostatic retest date is a pressure vessel nobody has qualified. The third is supply. Under the phasedown, virgin HFC is allocated rather than merely purchased, so pounds the shop cannot account for are pounds it will find hard to replace on the day it needs them.

Unaccounted pounds are the signal all three problems produce. A shop that reconciles monthly finds them while the week is still fresh; a shop that does not finds them at an inspection, at a reclaimer rejection, or at a rack that is empty in July.

Scope

Covers the shop-level cylinder register, the physical count, the monthly pounds reconciliation and its investigation threshold, the retest-date fleet, A1 and A2L segregation in the register and in the rack, and record retention.

Does not cover the per-job cylinder log, fill limits or the reclaimer handoff, which the refrigerant recovery and cylinder management SOP owns. Does not cover truck loading, transport weight limits or in-transit segregation, which the A2L cylinder storage and transport SOP owns. Does not cover incoming purity documentation, which the reclaimed refrigerant acceptance SOP owns.

Roles and responsibilities

Procedure

1. Give every cylinder a register row before it is used once. Record serial, cylinder specification, refrigerant dedication, safety class, tare and water capacity stamps, hydrostatic retest date, and current location. Acceptance: a register row per physical cylinder, with no cylinder in the rack that lacks one and no row without a cylinder. Wrong looks like tracking refrigerant by pounds only, which cannot tell you which vessel is overdue for retest; stop rule is that an unregistered cylinder is quarantined until its stamps are read, and if they are not legible it goes back to the supplier. Hazard at this step: reading stamps means handling cylinders, so they stay capped and upright and are moved on a cart rather than walked on their base.

2. Count the rack physically on a fixed cadence, monthly, at the same point in the month. Walk the rack with the register, put a scale under every cylinder that holds anything, and record gross minus stamped tare as net. Acceptance: a net weight for every cylinder, a location for every register row, and both lists closing with no orphans. Wrong looks like counting cylinders rather than weighing them, which makes a half-full cylinder and a full one the same entry; stop rule is that a cylinder in the register with no physical match is escalated the same day rather than carried forward as present. Hazard at this step: lifting cylinders onto a scale repeatedly is the manual handling injury in this procedure, so use a cart or two people and keep the cap on until the cylinder is set down.

3. Reconcile pounds per refrigerant, not across the shop. For each refrigerant separately: opening net on hand, plus purchased, plus recovered from jobs, minus installed into systems, minus returned to the reclaimer or supplier, gives expected closing. Compare that to the counted closing from step 2. Acceptance: the arithmetic written out per refrigerant with the variance shown as a signed number in pounds. Wrong looks like one combined total across refrigerants, which lets a surplus of one hide a shortage of another; stop rule is that a refrigerant whose job data is incomplete is reconciled as far as it goes and flagged incomplete rather than balanced with a plug figure. Hazard at this step: none, arithmetic done at a desk from the step 2 sheet.

4. Investigate a variance above the shop's threshold, and state the threshold as one rule. The default worth setting is per refrigerant, per month: investigate when the unexplained variance exceeds the greater of 2 lb or 2 percent of the pounds that moved in that month, where pounds moved means pounds issued to jobs for supply refrigerants and pounds returned to the reclaimer for recovered ones. Acceptance: every variance either under the threshold and recorded as such, or investigated to a named cause. Wrong looks like a threshold that moves to suit the month; stop rule is that a variance over the threshold with no cause found goes to the service manager as an open item rather than being written off quietly. Hazard at this step: none, a review at a desk, and its whole value is that it is done before the trail goes cold.

5. Work the retest fleet ahead of the date rather than at it. Sort the register by hydrostatic retest date and pull anything expiring within the next quarter out of the active rack and into the return queue. Acceptance: no cylinder in the active rack whose retest date is past, and a return queue holding everything inside the next quarter. Wrong looks like a retest date checked only at the moment of use, which puts the discovery in a driveway on a hot afternoon; stop rule is that a cylinder found past its date in the active rack is tagged out immediately and every job it touched since the date is identified. Hazard at this step: an overdue cylinder has been carrying pressure without requalification and may have gone in a hot van, so it is not filled, not vented and not moved further than the return queue.

6. Keep A1 and A2L separate in the register and in the rack, and give unknowns their own place. Sort the rack physically by safety class, keep A2L clear of oxidizers per the transport SOP's segregation rule, and hold a marked position for mixed or unknown contents that nothing else touches. Acceptance: class recorded on every register row, racks visibly sorted, and any unknown cylinder in the marked position with a dated note on how it got there. Wrong looks like sorting by refrigerant name alone, which reads fine until somebody meets a designation they do not recognize; stop rule is that a cylinder whose contents cannot be established is never transferred into a dedicated cylinder and is disposed of as mixed waste on the manager's call. Hazard at this step: an unknown cylinder is treated as flammable until proved otherwise, so it is stored and handled to the A2L rule rather than the A1 one.

7. File the reconciliation and hold it for the required period. Each month's sheet, the physical count, the manifests and the investigation notes go to one place. Acceptance: a filed set per month, retained for at least the three years the Section 608 recordkeeping provisions at 40 CFR 82.166 require, and longer where a state licensing board says so. Wrong looks like records living in the accounting system with no link to cylinder serials; stop rule is that a month cannot be closed with an open variance and no written note saying so. Hazard at this step: none, filing at a desk, and it is the step that makes an inspection a half-hour conversation instead of a search.

The record this produces

Two documents that have to agree with each other, plus the register that ties them together.

The register is the standing document: one row per cylinder, serial-keyed, carrying specification, dedication, class, tare, retest date and location. The monthly reconciliation is the moving one: per refrigerant, the five figures from step 3, the variance, and either an under-threshold note or an investigation outcome. The physical count sheet from step 2 is the evidence behind the closing figure.

Three readers. An inspector asks what came in and where it went, and the reconciliation answers that in one page with the manifests behind it. The service manager reads variances over several months, since a shop that is consistently short by a small margin has a logging habit rather than a theft problem, and the fix is different. And the cylinder custodian reads the retest column, because that column is the one that quietly turns a rack of assets into a rack of cylinders nobody may legally fill.

Worked pass: one month, a shop running R-454B supply and R-410A recovery

Count taken on the last working day of the month, with the register in hand.

R-454B, the supply side. Opening net on hand 62.0 lb, purchased 100.0 lb, installed into systems from the job tickets 118.4 lb, nothing returned. Expected closing is 62.0 plus 100.0 minus 118.4, which is 43.6 lb. Counted closing from the scale was 41.5 lb, so the variance is 41.5 minus 43.6, or 2.1 lb short.

Step 4 applied as written. Pounds moved for a supply refrigerant is pounds issued to jobs, 118.4 lb, and 2 percent of 118.4 is 2.368 lb. The threshold is the greater of 2 lb and 2.368 lb, so 2.368 lb governs, and the 2.1 lb variance sits under it. Recorded as under threshold, no investigation opened. Worth stating plainly because a flat 2 lb rule would have opened one: the greater-of construction is doing real work here, and it is doing it in the direction of not chasing normal hose losses across a busy month.

R-410A, the recovery side. Opening 88.0 lb, recovered from jobs 61.5 lb, returned to the reclaimer 120.0 lb. Expected closing is 88.0 plus 61.5 minus 120.0, which is 29.5 lb. Counted closing 21.5 lb, so the variance is 21.5 minus 29.5, or 8.0 lb short. Pounds moved for a recovered refrigerant is pounds returned, 120.0 lb, and 2 percent of 120.0 is 2.4 lb, which is greater than 2 lb and therefore governs. At 8.0 lb the variance is more than three times the threshold, so step 4 opened an investigation.

The cause was found in two days. One recovery cylinder had been filled on a weekend call and returned to the supplier the following Tuesday, and its physical tag had been updated while its register and job entries had not. The shop had shipped roughly 8 lb it never recorded receiving. Nothing was lost and nothing was vented; the ledger was simply behind the cylinder. The fix was a same-day logging rule for weekend calls rather than a new form.

Step 5 FAILED and took its stop rule. Sorting the register by retest date turned up two cylinders in the active rack already past their hydrostatic retest date, and one of them had been filled on a job eleven days earlier. Both were tagged out and moved to the return queue immediately, and the job the overdue cylinder touched was identified from the register so the ticket could be annotated. That is the step's stop rule executed in full: tag out, and then find what it touched, because the second half is the part that gets skipped.

References

• 40 CFR 82.166 for the Section 608 recordkeeping and retention requirements referenced in step 7, and 40 CFR Part 82 Subpart F for refrigerant handling generally
• 49 CFR Part 180 Subpart C for periodic requalification of DOT specification cylinders, which sets the retest interval marked on the cylinder
• 40 CFR Part 84 for the HFC phasedown and allowance framework that makes unaccounted virgin refrigerant a supply problem as well as a records problem; read the current allocation rule for the year you are in rather than a remembered figure
• See related: Refrigerant Recovery and Cylinder Management, A2L Cylinder Storage and Transport on the Truck, and Reclaimed Refrigerant Acceptance and Documentation