The short answer
Compare filtration-related cost for equivalent accepted output, not purchase price per bag alone. Keep measured inputs separate from assumptions, and do not count a cheaper batch as a win if its filtrate fails the required quality.
Choose a fair denominator
Define a batch by accepted volume and quality, not simply the quantity charged to a feed tank. If two runs deliver different accepted volumes, also compare cost per accepted m³ and explain why output differs. Agree the accounting boundary: consumables and operating costs can be compared without pretending to calculate the entire manufacturing cost. Use the same boundary for both alternatives, including the treatment of taxes, freight and reusable equipment.
List costs without counting them twice
Start with landed bag price multiplied by bags consumed. Add measured changeover labor, disposal and unrecovered process liquid valued on an agreed basis. Include downtime only when there is a defensible production-cost method. If an hourly downtime rate already contains labor, do not add the same labor again. Record energy where measured and material, rather than inventing a small universal pump cost.
Keep qualification testing, new housings and recurring operating costs in separate fields. Allocation over future batches is an assumption that depends on utilization. A one-off trial cannot establish annual savings, and an attractive payback calculation cannot repair missing filtrate-quality evidence. Label exclusions clearly so a purchasing decision does not mistake a partial worksheet for a complete financial case.
Work through a hypothetical batch
All figures below are invented solely to demonstrate arithmetic, in USD per batch with the same assumed accepted output. They are not JINLV prices, measured performance or predicted savings. Zero in an actual worksheet must mean a verified zero; use unknown for a missing value. Labor time is summed across all workers in person-hours, not elapsed outage hours; this example uses the same labor rate for both options.
| Cost input | Hypothetical option A | Hypothetical option B |
|---|---|---|
| Bag purchases | 4 × 8 = 32 | 2 × 13 = 26 |
| Changeover labor, total person-hours; excludes downtime charge | 0.8 person-h × 25 USD/person-h = 20 USD | 0.4 person-h × 25 USD/person-h = 10 USD |
| Disposal | 4 × 2 = 8 | 2 × 2 = 4 |
| Unrecovered liquid | 6 L × 3 = 18 | 4 L × 3 = 12 |
| Subtotal of listed items only | 78 | 52 |
| Energy, downtime, qualification and equipment | Not included | Not included |
Test the assumption that drives the result
The apparent difference above depends strongly on option B using two bags. If it instead uses four, and its labor, disposal and loss match A, its subtotal becomes 52 + 20 + 8 + 18 = 98. That reversal is why bag life must be measured, not inferred from a premium label. IFM identifies duty-dependent flow variables; Eaton's PROGAF comparisons have specified test conditions. Neither establishes your batch economics.
Run comparable production-representative trials and record the distribution, not just the best result. Note feed solids, temperature, flow and the reason for each changeout. A trial ending at shift change is different from one ending at a pressure or quality limit. Preserve unsuccessful trials in the comparison.
Make the buying decision auditable
For every input, record its unit, source, date, owner and status as measured, quoted or assumed. Present a range when evidence is variable, with the condition that would change the choice. Separate technical acceptance from commercial approval. A supplier may offer a lower unit price while another option has a lower verified operating subtotal; neither should be selected on an incomplete calculation disguised as a guaranteed return.
Your review checklist
- Accepted output volume and quality gate defined.
- Landed prices and consumption evidence attached.
- Labor and downtime boundaries checked for duplication.
- Product loss and disposal measured on the same basis.
- Missing costs marked unknown, not zero.
- Sensitivity case and decision owner recorded.
Limits of this guidance
An illustrative operating-cost worksheet, not a quotation, ROI forecast or financial recommendation. Technical trials require approved process and safety procedures; company-specific cost and performance inputs remain to be established.
Questions buyers ask
Can I use this example to claim a percentage saving?
No. The numbers are hypothetical and exclude several costs. Only a properly bounded comparison using your own verified inputs can support a savings statement, and its assumptions must remain visible.
What if one trial batch is all we can afford?
Use it to screen feasibility and identify uncertain inputs. Report it as one observed batch under stated conditions, not a forecast of average service life or annual return.
Technical references
References support general principles or the named supplier's own products; they do not certify or validate a JINLV configuration.
- Frequently Asked Questions — Industrial Filter Manufacturing
- PROGAF Filter Bag Range — US Technical Data Sheet
AI-assisted technical synthesis of the references below, with editorial checks. This is general procurement guidance, not an independently signed engineering review or a product validation report.
English is the indexing version. Chinese and Indonesian are reading translations of the same article.