How to Select a Makeup Water Storage Tank Supplier: Capability and QA Checklist

Choosing a makeup water storage tank supplier is a capability decision, not a price comparison, because the tank holds water that may feed a potable or semi-potable loop and must run for decades. The wrong supplier shows up years later as re-lining, leaks, or a compliance gap. This article is a practical checklist you can run before requesting a quote, focused on what a competent makeup-water tank supplier should demonstrate.

Key Takeaway

To select a makeup water storage tank supplier, verify five things in order: coating capability with retained test records (GFS fired at 820-930 C or FBE, holiday-tested), design to AWWA D103 and ISO 28765 with wind and seismic calculations, potable-grade compliance where relevant (NSF-61, WRAS, EN 1717 backflow), a delivery model built on flat-pack panels and local erection, and verifiable references rather than anonymized claims. We have delivered large coated clean-water tanks such as the 30,549 m3 Sardinia process-water tank in Italy (2025) and the 21,088 m3 Cilincing drinking-water tank in Indonesia (2024); these are analogous industrial references, not makeup or data-center projects.

Coating QA is the first filter

Make-up water attacks bare steel and grows biofilm on rough surfaces, so the lining is the life-limiting item. Require GFS or FBE with a holiday-test record and a chemical-resistance list per your water. A supplier without retained coating QA is a risk regardless of tank size, so ask for the test reports on past projects.

· GFS or FBE required.

· Holiday-test record.

· Chemical-resistance list.

· QA predicts life.

Design and code discipline

Confirm the supplier designs to AWWA D103 and ISO 28765 for bolted steel, with wind, seismic, and foundation calculations for your site, and can state the governing standard. For a pressurized make-up vessel, ASME Section VIII and the U-stamp scope are confirmed per project. Design discipline protects the asset.

· AWWA D103 + ISO 28765.

· Wind/seismic/foundation.

· ASME where pressurized.

· Governing standard stated.

Potable-grade compliance

Where the make-up water is potable or semi-potable, the supplier must show a potable-compliant lining (NSF-61, WRAS, or local equivalent) and a backflow strategy per EN 1717 or the national equivalent. This is a compliance gate, not a nice-to-have, and a supplier vague on it should be screened out.

· NSF-61 / WRAS lining.

· EN 1717 backflow plan.

· Compliance gate.

· Screen out vagueness.

Delivery and references

Flat-pack panels and local erection keep the build off the mechanical critical path; confirm customs documentation and crew or EPC support. Then ask for verifiable references, not generic claims, because a real supplier can name projects you can confirm. The table contrasts the criteria.

· Flat-pack + local erection.

· Customs documentation.

· EPC or crew support.

· Verifiable references.

Honest boundaries on our references

We have no makeup-water or data-center project in this library. The large coated clean-water tanks we cite (Sardinia 30,549 m3, Cilincing 21,088 m3) are analogous industrial deliveries, not makeup or data-center projects, offered as evidence of our coating and delivery capability.

· No makeup / DC project.

· Citations analogous, not claims.

· Coating and delivery real.

· Verify our references too.

Frequently Asked Questions

What is the first thing to check in a makeup tank supplier?

Coating QA: a holiday-tested GFS or FBE lining with a chemical-resistance list, because the lining limits tank life in make-up service.

Which standards should the supplier design to?

AWWA D103 and ISO 28765 for bolted steel with wind and seismic calculations; ASME Section VIII where the tank is pressurized.

How do I confirm potable-grade compliance?

Ask for a potable-compliant lining (NSF-61, WRAS, or local) and a backflow plan per EN 1717 or the national equivalent.

Why does delivery model matter for a tank?

Flat-pack panels and local erection protect coating quality and shorten schedule versus field painting, keeping the build off the critical path.

Should references be verifiable?

Yes, a real supplier names projects you can confirm, not generic claims in a brochure.

Have you built makeup tanks for data centers?

Not in our project library. We cite large coated clean-water tanks as analogous capability, not makeup or data-center deliveries.

Selecting a makeup water storage tank supplier starts with the things that decide the asset's life and compliance: a holiday-tested inert lining, structural design to AWWA D103 and ISO 28765, and a credible potable-grade and backflow story where the water is potable. Add a flat-pack delivery model and verifiable references, and the field sorts itself, because the supplier's coating QA and design discipline, not the lowest price, are what you are actually buying. Verify the records before you verify the quote.

Suggested CTA: Send us your duty, water chemistry, and compliance region and we will show where we land on this checklist for your makeup water tank.