HDG Pressed Steel Water Tanks In Singapore

Panels are supplied in 1.22 m × 1.22 m and 1.00 m × 1.00 m modules as standard. Half modules of 0.5 × 1.0 m, 0.6 × 1.22 m and 0.5 × 0.5 m are available on request, which is what allows a tank to be built to an awkward plant room rather than the plant room being built to the tank.

Plate thickness is set by tank height and by the design standard. SS 22 is our default; SANS is available on request. The difference matters — SS 22 holds most panels at a flat 5 mm, while SANS steps thickness down tier by tier.

Roof covers are hydraulically pressed at 1.5 mm or 3.0 mm, with pitched or domed profiles available on request.

Alternative finishes and linings can be supplied where a specification calls for them. If your project requires something other than standard hot-dip galvanising, contact us with the requirement and we will confirm what can be manufactured.

Panel thickness is the clearest difference between tanks that look identical in a photograph. Some imported panels are supplied at 3 to 4 mm where the equivalent SUNNIK panel is 5 mm. That difference does not show on handover day. It shows in year twelve.

Internal, external or hybrid reinforcement — which does your project need?

A pressed steel tank has to be reinforced to hold its shape under load, and there are three ways to do it. This is one of the few specification choices that genuinely changes both the price and the long-term behaviour of the tank, and it is rarely explained before a quotation lands.

Internal reinforcement uses angle stays inside the tank at the junction of two or more plates, connecting sides to bottom, ends to bottom, and horizontally from side to side and side to end. This is the most common design in Singapore. It is the cheaper option and it is standard practice here, which is why most tanks you will see locally are built this way.

External reinforcement uses hot-dip galvanised universal beam steel with brackets on the outside of the tank, with no bracing inside the water at all. It is more stable, and because nothing structural sits in the water it removes a corrosion path and a contamination path at the same time. It also makes internal inspection and cleaning easier over the tank’s life. It costs more than internal reinforcement.

Hybrid reinforcement combines both. It is specified where structural stability matters most — typically countries with seismic requirements — and it is considerably more expensive than either option on its own. It is rarely required in Singapore.

For most Singapore projects, internal reinforcement is the appropriate standard. External is a deliberate upgrade, worth considering where stored water quality or ease of internal inspection justify the additional cost — potable-adjacent duties and tanks with difficult access are the usual cases. We will set out which design a quotation is based on so you are comparing like with like.

What does hot-dip galvanising actually do?

Hot-dip galvanising is the corrosion protection that gives these tanks their service life, and it is applied to ISO 1461:2009. The finished panel is immersed in molten zinc rather than sprayed or painted, so the zinc bonds metallurgically to the steel instead of sitting on top of it.

That distinction matters more than it sounds. A painted or coated tank fails first at its edges, bolt holes and cut lines — precisely the points where water sits and where a coating is thinnest. Immersion coats every surface, including edges and holes, to a uniform standard. It is why a hot-dip galvanised pressed steel tank has a typical service life of 20 to 25 years in Singapore conditions, and why fire specifications are written around it.

Galvanising is applied after the panels are pressed, not before. Pressing a pre-galvanised sheet would crack the coating at exactly the fold lines that carry the structural load.

What capacity can a pressed steel tank hold?

Capacity is set by footprint and height. Using 1.22 m imperial modules, a 1220 × 1220 mm tank at one module high holds approximately 1.82 m³, and the tabulated range extends to roughly 1,229 m³ at a 15,860 × 15,860 mm footprint at 4.88 m high. Metric 1.0 m modules run to approximately 507 m³ at 3 m high and 676 m³ at 4 m.

Those are nominal figures with no freeboard. Effective capacity is always lower once freeboard and fittings are accounted for, so confirm the effective requirement rather than the nominal one before a tank is sized. We will do that calculation as part of any quotation.

What does the site need to provide?

Support beams are required at 1.0 m centres for metric modules or 1.22 m centres for imperial, with a level tolerance of ±6.0 mm across the base. A minimum of 500 mm clearance is needed around and beneath the tank, and a minimum of 750 mm above the roof for manhole access. Above 3000 mm, the purchaser provides steel capping flats on the concrete support.

The reinforced concrete plinth is a separate contractor’s scope and is not included in our supply. Tanks must be installed and certified by an approved installer or the manufacturer’s warranty is void.

What fittings are included?

• Lockable 600 × 600 mm manhole to each compartment
• Ø150 mm insect-proof air vent
• Internal and external ladders in HDG or aluminium; external ladder with safety cage on request
• Mechanical level indicator with stainless wire rope and PVC ball float
• Welded or bolted flange nozzles for inlet, overflow, outlet and drain

Why buy from Magtech rather than an importer?

We are the sole Singapore distributor for SUNNIK, a manufacturer with more than 40 years in sectional tanks, and we import direct. In a market with no local tank factory, that removes a reseller layer from the price.

Installation is carried out by our own crews in Singapore, not subcontracted. Several of our installers have been doing this work for 10 to 20 years. The commercial effect is that there is no subcontractor margin in the price, and an experienced crew does not turn a two-day dismantle into a five-day one when a site surprises them.

Why choose Magtech General for your fire safety water needs?

• Experience and Expertise: With over 35 years of experience, our team has the technical experience to handle a wide range of fire protection water tank installations and replacement works.
• Comprehensive Solutions: We provide end-to-end support, including supply, installation, replacement, repair, and maintenance for sprinkler, hosereel, and wet riser tank systems.
• Compliance with Local Regulations: We ensure full compliance with Singapore Civil Defence Force (SCDF) requirements, giving you peace of mind and reliable, long-term performance.

Manufacturing specifications