How do you calculate a membrane supplier risk score?

Multiply three 1-to-10 ratings: failure severity, occurrence likelihood, and detection difficulty. With severity 6, occurrence 4 and detection 3 the score is 72, placing the supplier in the moderate-risk band that warrants a documented mitigation plan.

What is a good membrane supplier risk score?

Lower is better. On a 1-1000 scale, scores under about 40 are low risk, 40-100 are moderate and need monitoring, and above 100 typically trigger a corrective-action request or a hold on new orders until controls improve.

Why use the same scale for membrane, pump and chemical suppliers?

A common 1-10 scale lets you compare a high-pressure pump vendor against a membrane element vendor on equal footing, so limited audit and inspection budget goes to the supplier with the highest score rather than the loudest complaint.

Severity vs occurrence, which matters more?

Severity should dominate your attention. A rare defect (low occurrence) that destroys an entire RO train or breaches the discharge permit (severity 9-10) is far more dangerous than a frequent cosmetic flaw, even if both produce a similar multiplied score.

How is this different from a simple price or on-time-delivery rating?

Price and delivery measure performance you already see; this score measures latent failure risk, the probability and consequence of something going wrong that current inspection might miss, which is exactly what supplier qualification is meant to surface.

Can two suppliers with the same score have different real risk?

Yes. A 2×6×6=72 supplier (low severity, but frequent and hard to detect) is operationally different from a 9×4×2=72 supplier (catastrophic but rare and visible). Always read the three factors, not just the product.

Desalination & Membrane Water Treatment Equipment calculator

Membrane Supplier Risk Score Calculator

The Membrane Supplier Risk Score is a Failure Mode and Effects Analysis (FMEA) style risk priority number applied to the supply base behind a desalination or membrane water treatment plant. Procurement engineers and quality managers use it to rank RO/NF membrane elements, pressure vessels, high-pressure pumps, instruments and chemical-dosing suppliers on one comparable scale before issuing a purchase order or qualifying a second source. It matters because a single off-spec batch of membrane elements can push a 10 MLD plant's permeate quality outside permit, and the cheapest supplier is rarely the lowest-risk one. The score turns vague vendor concerns into a defensible, auditable number you can drop straight into a supplier scorecard.

What this calculator does

Score supplier risk for membranes, pressure vessels, pumps, instruments, chemicals, and cartridges using severity, occurrence, and detection ratings before quoting or purchasing.
Use it when membrane supplier risk in desalination and membrane water treatment equipment needs a defensible ranking against other desalination and membrane water treatment equipment risks for the next review.
It multiplies a supplier's failure severity, the likelihood of a non-conformance, and how hard the resulting defect is to catch before it reaches your skid, producing a single risk priority number.

Formula used

Membrane equipment supplier risk score = supplier impact severity score × supplier issue occurrence score × supplier detection control score
Use the same scoring scale across membrane, pump, vessel, instrument, and chemical suppliers being compared.

Inputs explained

Membrane supply failure severity (1-10):
Likelihood of supplier non-conformance (1-10):
Inability to detect a defect before install (1-10):

How to use the result

Use it during supplier qualification, second-source approval, annual vendor reviews, or whenever a quality escape forces you to re-rate an existing membrane or pump vendor.
The number is ordinal, not financial, a score of 120 is not literally twice the dollar exposure of 60, and identical scores can hide very different severity profiles, so always inspect the severity factor behind a high number.

Current U.S. benchmarks

Global copper trades at $13,543 per tonne (IMF via FRED, Jul 2026), up 38.6% in a year, and U.S. industrial electricity averages 8.71 cents per kWh. Both feed electrified-hardware unit economics.
Steel mill PPI stands at 374.203 (BLS, Jul 2026), up 22.5% from a year earlier. New factory orders are up 7.4% year over year (Census).

Common questions

How do you calculate a membrane supplier risk score? Multiply three 1-to-10 ratings: failure severity, occurrence likelihood, and detection difficulty. With severity 6, occurrence 4 and detection 3 the score is 72, placing the supplier in the moderate-risk band that warrants a documented mitigation plan.
What is a good membrane supplier risk score? Lower is better. On a 1-1000 scale, scores under about 40 are low risk, 40-100 are moderate and need monitoring, and above 100 typically trigger a corrective-action request or a hold on new orders until controls improve.
Why use the same scale for membrane, pump and chemical suppliers? A common 1-10 scale lets you compare a high-pressure pump vendor against a membrane element vendor on equal footing, so limited audit and inspection budget goes to the supplier with the highest score rather than the loudest complaint.
Severity vs occurrence, which matters more? Severity should dominate your attention. A rare defect (low occurrence) that destroys an entire RO train or breaches the discharge permit (severity 9-10) is far more dangerous than a frequent cosmetic flaw, even if both produce a similar multiplied score.
How is this different from a simple price or on-time-delivery rating? Price and delivery measure performance you already see; this score measures latent failure risk, the probability and consequence of something going wrong that current inspection might miss, which is exactly what supplier qualification is meant to surface.

Last reviewed 2026-08-13.