COMPOSITE BONDED

Underground Storage Tanks

Foregweld_composite_tanks_underground

The strength of steel meets the corrosion resistance of polyester in one super tough storage tank

Forgeweld’s composite bonded underground storage tanks offer problem-free performance without any external corrosion monitoring.

A formidable combination of materials

Combining the structural integrity of 6 mm SABS Grade 355JR carbon steel plate with the corrosion resistance of a 2,5 to 3 mm Fibreglass Reinforced Polyester (FRP) shell (Spec UL1746), these tanks have high tensile strength and impact properties and are recommended for the safe storage of all blends of conventional and oxygenated fuels, including methanol.

Built to high spec

Forgeweld Composite Bonded Steel Tanks are built with shell-and head-thickness to SANS 1535/UL 58 specifications. Before application of the GRP laminate coating, the external surface of a tank shall be blast-cleaned to preparation grade SA 2,5, as described in ISO 8501-1 (as per SANS1535 standard).

A 2.5mm coating of isophthalic resin reinforced with chopped fiberglass is applied to the entire external surface of the tank (UL 58). The finished cladding is quality checked by a 35 000 volt holiday test over 100% of its surface to ensure that there are no discontinuities in the coating.

Forgeweld composite tanks are fully insulated from the surrounding soil and are equipped with isolating bushes. No cathodic protection or corrosion monitoring is required.

Combining the structural integrity of 6mm SABS Grade 355JR carbon steel plate with the corrosion resistance of a 2,5 to 3 mm Fibreglass Reinforced Polyester (FRP) shell (Spec UL1746), these tanks have high tensile strength and impact properties and are recommended for the safe storage of all blends of conventional and oxygenated fuels, including methanol.

10-year warranty

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Adaptable to your needs

• Fitted with lifting lugs or flanged or dished ends.
• Top 745mm diameter manholes incorporate filler, dip, breather and pump-suction apertures.
• A forecourt manhole can be supplied if required.
• Drop pipes are also fitted to order.

Top quality and safety standards

Forgeweld composite tanks are manufactured to the very highest standards, conforming to and even exceeding the requirements of the world’s top standards authorities:

UL 1746 Part II – Composite Tanks – This standard covers the material testing and application of the 2,5 mm FRP coating applied to the external surface of every Forgeweld composite tank.

In terms of this standard, the application of a 2,5 mm FRP coating allows manufacturers to reduce shell tank thickness. We don’t exercise this concession, thus ensuring that the structural strength and integrity of our composite tanks exceed that called for by this standard.

SANS 1535 – Glass Reinforced Polyester Coated Steel Tanks for the Underground Storage of Hydrocarbons and Oxygenated Solvents Intended for Burial Horizontally:

Regular inspections and tests by the SABS ensure our compliance with this standard.

SABS 1531 Grade 355JR (equivalent to Grade 43A of the applicable British code):
The steel used in the manufacture of our composite tanks conforms to this specification.

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Tank dimensions and capacity

Forgeweld composite-bonded USTs are supplied in standard sizes ranging from 4,5 m3 to 46 m3. Larger units can be manufactured on request.

VOLUME m3 IN. DIAMETER MM OUT. DIAMETER MM OVERALL LENGTH MM SHELL THICKNESS MM CALC. CAPACITY liters APPROX WIGHT kg
4.5 1180 1817 1900 6 4862 860
9 1815 1817 3700 6 9468 1342
14 1815 1817 5500 6 14074 1826
23 2318 2330 5500 6 23210 2231
30 2318 2330 7300 6 30806 2850
46 Long 2318 2330 10900 6 45999 4123
46 Dumpie 2870 2882 7800 6 48547 3824
60 2870 2882 9600 6 60191 4592
83 2870 2882 13200 6 83481 6127
100 3100 3112 13550 6 100035 7179

 

Click here to download our Composite Bonded brochure (PDF)
To order click here to contact your nearest Forgeweld office.