In short
- Excess stock and stockouts usually coexist because reordering is driven by memory rather than by consumption data.
- Physical and system stock diverge when issues are not booked against work orders, which then makes every downstream number untrustworthy.
- Material lying at job work vendors is inventory you own and must be visible, or you will reorder what you already have.
- Min-max levels on castings, bearings and seals prevent the stockouts that stop a line, at very modest carrying cost.
Why pump plants carry the wrong stock
Walk any Coimbatore pump unit and you will find the same pattern: racks of slow-moving castings and spare impellers bought years ago, alongside a line stopped because a particular bearing or seal is unavailable. Too much and too little at once.
The cause is almost never carelessness. It is that reordering runs on memory and instinct rather than on consumption data. A storekeeper who remembers a painful stockout orders generously forever after. An item nobody remembers running short of gets ordered late every time. Neither decision is connected to how fast the item actually moves.
Layered on top is the WIP problem. Work in progress accumulates between machining, plating, winding and assembly, and at job work vendors. Because it is spread across locations and partners, no single number tells you how much cash is sitting in it.
Make stock trustworthy first
Before optimising anything, physical and system stock have to agree. If they do not, every downstream calculation, MRP, costing, valuation, is built on sand, and people quietly revert to walking to the rack to check.
Three disciplines fix this:
- Issue against work orders. Material leaves stores against a specific job, not on a verbal request. This single change is usually the largest source of improvement.
- Bin-level locations. Raw stores, WIP, finished pumps and spares as distinct tracked locations, with bins inside them.
- Cycle counting. A rolling count of a small number of items every week rather than one traumatic annual stocktake.
Cycle counting is the one most plants resist and the one that pays back fastest, because it surfaces process errors while they are small enough to diagnose.
See how this runs on your own pump BOM, casting to dispatch.
Min-max that reflects real consumption
Once stock is trustworthy, reorder levels can be set from data rather than from memory. For a pump plant a workable approach is:
| Item class | Approach | Why |
|---|---|---|
| Castings | Reorder point driven by foundry lead time | Longest lead time, usually the binding constraint |
| Motors | Plan against HP demand mix | Wrong HP in stock is as bad as none |
| Bearings and seals | Min-max with safety stock | Low value, high stoppage cost |
| Winding wire | Consumption based, price-watched | Copper price affects costing too |
| Fasteners | Two-bin or simple min-max | Not worth sophisticated planning |
| Finished pumps | Model-wise reorder for MTS models | Protects dealer service levels |
The principle is to spend planning effort where it changes an outcome. Sophisticated forecasting on fasteners is wasted; getting casting reorder points right is worth real money.
Count what is at your job work vendors
This is the single most commonly missed category. Castings sent out for machining, components sent for plating, stators sent for winding, all of it is inventory you own and have paid for, sitting somewhere else.
When it is invisible, two things happen. You reorder material you already have, and you write off shortfalls at reconciliation because nobody can say what went out and what came back. Tracking challan issue, return, scrap and short-close per vendor closes both gaps, and produces the ITC-04 data as a by-product. Our job work control page covers the mechanics.
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Spares are a different business
Pump spares, impellers, seals, bearings, shafts, kits, behave differently from production material. Demand is driven by an installed base and by dealer service rather than by your production plan, and service level matters more than carrying cost because a dealer who cannot get a spare will source it elsewhere permanently.
Practically this means cataloguing spares by pump model so demand can be related to units in the field, planning them separately from production consumption, and giving dealers and service teams a way to order against the same stock. See inventory management and after-sales service for how the two connect.
What to measure
- Inventory turns, overall and by item class, to see whether cash is actually moving.
- Stock accuracy from cycle counts, which should climb toward the high nineties.
- Stockout events that stopped a line, counted rather than estimated.
- WIP value by stage, including material at vendors.
- Slow and non-moving stock, reviewed quarterly with a decision on each item.
The last one requires discipline. Non-moving stock does not become useful by being carried another year, and writing it off honestly frees both cash and rack space.
Key Takeaways
- Excess stock and stockouts coexist because reordering runs on memory rather than consumption data.
- Fix stock accuracy first through issue-against-work-order, bin locations and cycle counting.
- Set reorder policy by item class, concentrating effort on castings and motors where it changes outcomes.
- Material at job work vendors is your inventory and must be visible or you will double-order.
- Plan spares separately, driven by installed base and dealer service levels.
- Measure turns, stock accuracy, stockout events, WIP by stage and non-moving stock.
Frequently Asked Questions
Because reordering is driven by memory rather than consumption data. Items associated with a painful past stockout get over-ordered indefinitely, while items nobody remembers running short of are ordered late every time.
Issue material against work orders rather than verbally, track bin-level locations, and run weekly cycle counts on a rotating subset instead of one annual stocktake.
High nineties by count is achievable once issues are booked against jobs and cycle counting is routine. Below the low nineties, people stop trusting the system and revert to checking the rack.
Yes. It is inventory you own and have paid for. If it is invisible you will reorder items you already have and write off shortfalls you cannot explain at reconciliation.
From foundry lead time plus a safety margin reflecting supply reliability, because castings are usually the longest lead item and therefore the binding constraint on delivery.
No. Spares demand is driven by the installed base and dealer service rather than by your production plan, and service level generally matters more than carrying cost.
Make WIP visible by stage first, including at vendors. Most plants find the excess sits in one or two stages, and releasing work in smaller, more frequent batches reduces it without affecting output.
Review it quarterly and make an explicit decision on each item: use, sell, or write off. Carrying it another year does not make it useful and it consumes both cash and space.
Far less than an annual stocktake. Counting a small rotating subset weekly takes minimal time and surfaces process errors while they are still small enough to diagnose.
Stock accuracy, because every other number depends on it. Turns, WIP and service level are only meaningful once the underlying stock figure is trustworthy.
Conclusion
Inventory is where most pump manufacturers have cash they cannot see. The path out is unglamorous but reliable. Make stock trustworthy by issuing against work orders and counting continuously, then set reorder policy from real consumption rather than from memory, concentrating effort on castings and motors where the money and the lead times are. Make material at job work vendors visible so you stop buying what you already own, and plan spares as the separate, service-driven business they actually are. None of this requires heroics. It requires the discipline to book transactions as they happen and a system that turns those transactions into a number the whole plant trusts.
Explore our pump manufacturing ERP solutions
ERP for Pump Inventory Management, Zoho Inventory for Pump Makers, ERP for Pump Spares & Impeller Manufacturers, ERP for Pump Subcontracting, Pump Manufacturing ERP Software in Coimbatore. Or talk to our Coimbatore ERP team.
Want to see how much cash is sitting in your stores and WIP?
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