UL 58 is the UL standard for steel underground tanks that store flammable and combustible liquids. It covers horizontal, atmospheric-type, cylindrical steel tanks, single-wall and secondary-containment (double-wall), including multi-compartment versions, built and leak-tested in the factory as complete vessels. If your project uses FRP tanks or GRE/FRP pipe, UL 58 is usually the wrong clause to copy.
IFGS sources GRE, FRP and RTP products from licensed partner factories in China and worldwide and handles spec confirmation, procurement and pre-shipment QC. IFGS has no factory of its own, and nothing on this page claims UL listing or certification for IFGS products.
UL-58 – Steel Under Ground (Single & Double Wall) Storage Tanks For Flammable And Combustible Liquids
The published UL 58 scope makes four points:
- Form: horizontal, atmospheric-type steel tanks for underground storage of flammable and combustible liquids.
- Configurations: single wall tanks, secondary containment tanks, multiple compartment single wall and multiple compartment secondary containment tanks.
- Factory completeness: cylindrical tanks fabricated, inspected and tested for leakage before shipment from the factory as completely assembled vessels.
- Installation codes: the Standard for the Installation of Oil-Burning Equipment (NFPA 31), the Flammable and Combustible Liquids Code (NFPA 30), the Automotive and Marine Service Station Code (NFPA 30A), the Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines (NFPA 37), the Fire Code (NFPA 1) and the International Fire Code. Earlier editions cited the Uniform Fire Code. Confirm the edition and the authority having jurisdiction for your site.
The scope also sets boundaries. UL 58 does not apply to welded steel oil-storage tanks under API 650, or to tanks intended for chemical and petrochemical plants. It does not cover corrosion protection: factory-installed external corrosion protection systems for steel underground tanks are covered by UL 1746.
Reading a scope is not a listing. Do not treat a blog mention, a photo or a pasted mark as proof that a tank model is Listed.
Why UL 58 shows up on FRP and GRE projects
Steel tank language appears on composite projects because yards mix materials, EPC templates carry steel clauses into FRP specifications, and corrosion and secondary-containment expectations differ by material. Confusing UL 58 (steel tank construction) with UL 1316 (FRP underground tanks) or UL 1746 (external corrosion protection for steel tanks) leads to quotes that do not match and slow approvals. Start with the liquid, burial or aboveground, single or double wall, monitoring and required documents, then map to the right standard.
UL 58 vs related standards
| Focus | UL 58 | Often confused with |
|---|---|---|
| Subject | Steel underground tanks for flammable and combustible liquids | — |
| Non-steel tanks | Not FRP construction | What Is UL 1316? — FRP underground tanks |
| Steel corrosion protection | Outside UL 58 scope | What Is UL 1746? Parts I–IV for Steel Tank Corrosion Protection — external corrosion protection for steel underground tanks |
| Large welded aboveground oil tanks | Not covered | API 650 (separate standard) |
| Composite line pipe (RTP, GRE) | Not a tank standard | Pipe specifications, handled on a separate RFQ line |
In practice: if you want FRP tanks, do not paste UL 58 as the material clause. If you need factory corrosion protection on steel, bring UL 1746 into the conversation. If you need GRE, FRP or RTP pipe, separate pipe specifications from tank standards early.
What UL 58 does not replace
- Standard text is not a certificate. If listing is required, ask for the file, model and mark for the shipped unit.
- Factory location. IFGS sources from licensed partner factories in China and worldwide. Mentioning UL 58 here does not imply a USA plant or a UL mark on IFGS goods.
- Installation and operation. A construction standard does not replace NFPA, fire-code or local rules, backfill practice or leak detection.
- Marks. Reject artwork that pastes UL logos onto unlisted products. The images on this page carry no certification marks.
Checklist for tank and pipe RFQs
- Steel or FRP vessel? FRP tanks usually follow UL 1316, not UL 58.
- Underground or aboveground?
- Single wall, double wall, compartments and monitoring?
- For steel: the corrosion protection approach (often UL 1746).
- Connected piping: GRE, FRP or RTP pressure, temperature, fluid and the applicable pipe standards.
- Documents: standard edition, material certificates, factory leak-test records, installation instructions, and listing evidence only where the project requires it.
For a steel inner tank with a composite outer barrier, see SF Double Walled Tanks.
Frequently Asked Questions
What is UL 58?
UL 58 is the UL standard for steel underground tanks for flammable and combustible liquids. It covers horizontal, atmospheric-type, cylindrical steel tanks that are fabricated, inspected and leak-tested in the factory as complete vessels.
What types of tanks does UL 58 cover?
Single wall tanks, secondary containment tanks, multiple compartment single wall tanks and multiple compartment secondary containment tanks.
What installation codes are UL 58 storage tanks used with?
The current scope lists NFPA 31 (oil-burning equipment), NFPA 30 (Flammable and Combustible Liquids Code), NFPA 30A (Automotive and Marine Service Station Code), NFPA 37 (stationary combustion engines and gas turbines), NFPA 1 (Fire Code) and the International Fire Code. Confirm the edition your authority having jurisdiction applies.
Is UL 58 the same as UL 1316?
No. UL 58 covers steel underground tank construction; UL 1316 covers FRP underground tanks.
Does UL 58 cover coatings or corrosion protection?
No. The UL 58 scope excludes corrosion protection. Factory-installed external corrosion protection systems for steel underground tanks are covered by UL 1746.
Does “UL 58” on a datasheet mean the tank is Listed?
Not by itself. Verify the listing for the exact model if your project requires it.
Does IFGS make UL 58 steel tanks in the USA?
No. IFGS is a GRE, FRP and RTP sourcing and QC partner working with licensed partner factories in China and worldwide. This page claims neither USA manufacturing nor UL listing.
Next step: separate the tank standard path from the pipe path, then send IFGS the fluid, pressure, temperature, length and destination. Let’s discuss your project. Or Ask IFGS.AI.
Educational overview only. Confirm standard editions, local rules and any listing needs with your project team before purchase or installation.