Two Piece GRP Water Tanks

DECCA / TWO-PIECE GRP STORAGE

Two sections for delivery and on-site assembly

Two factory-moulded GRP sections joined on site. Decca helps review the delivery route, joint access and fitting arrangement.

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Selection help · Drawing review · Agreed installation support

Decca two-piece GRP cold water tank showing the bolted horizontal body joint — Example DP model. Cover, inlet arrangement and fittings depend on the selected product.

Two-piece tanks at a glance

Check the dimensions of each section, the external joint flange and the space needed to assemble and seal the tank.

GRP means glass-reinforced plastic. Select the tank body, inlet arrangement and connection options as one complete specification.

Tank body	Two moulded GRP sections with a horizontal joint.
Assembly	Sections are joined and sealed in position using the agreed installation method.
Delivery check	Check each section, including its flange, through doors, turns, stairs and hatches.
Support	Support the complete base to the agreed tank drawing.
Access to retain	Working room around the body joint, above the cover and at serviceable fittings.

Check route and joint access

Check each section, including its flanges, through the entire route.
Allow working room to align, seal and bolt the horizontal joint.
Agree assembly, sealing, testing and commissioning responsibilities.

Before installation

Follow the agreed support drawing; your structural designer confirms the full filled load.
Keep the cover, valves, overflow, drain and instruments accessible.
Compare sectional storage if the body or sections cannot be delivered or assembled.

Check the usable capacity

Nominal litres describe the listed tank size. Inlet, overflow and outlet arrangements set the water you can use. Review the DP model and connections in the detailed calculator.

Nominal: listed brim-full capacity.
Actual: water up to the top level.
Usable: water between the operating limits.

DP internal sizes are approximate. Decca confirms the final model, construction and levels.

Choose your tank in the shop.

Open the relevant range to compare the available products. Use the selected product page for current dimensions, specification, available extras and lead time.

01 / MODEL

Choose a nominal size and check the external dimensions.

02 / SPECIFICATION

Check the insulation and AB or AG inlet arrangement listed for the selected model.

03 / CONNECTIONS

Choose the available inlet, overflow, outlet, drainage and monitoring options.

AB and AG are inlet-arrangement choices. Use the arrangement specified by your system designer; do not choose it from the nominal litres alone.

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Calculate, save and enquire

Use the detailed calculator for model dimensions and usable storage. Your selection and result carry into the enquiry.

Detailed capacity and PDF

Choose the DP model and connections. See nominal, actual and usable litres, download a technical sheet, or ask Decca to review your result.

Start the detailed calculator →

Quick volume estimate

For an initial litres/gallons estimate from dimensions. Continue to the detailed calculator when reviewing a DP model or connection layout.

Open the quick estimate →

Common questions

Is a two-piece tank the same as a one-piece tank with a lid?

No. Two-piece describes a tank body divided into two joining sections. The cover is a separate feature. Check the construction shown on the selected product drawing.

Will it fit through a standard doorway?

Check the actual dimensions of each section, including flanges, and the complete delivery route. A reduced section height does not necessarily reduce its length or width.

Selection, manufacture and installation support

Decca helps select the model and fittings, reviews your drawing and delivery route for the two moulded sections and their assembly joint, and manufactures the agreed tank. Ask us to include installation if required; the quotation will define that work and any testing, cleaning, disinfection and handover in our scope.

Your two-piece preference carries through. Add any location, timing, access or approval details you have.

01772 825757 · [email protected]

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