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Sectional Tank Components

Interact with our 3D sectional GRP tank animation and VR tool! Upskill today and discover a complete range of tank components and why they are used. Take a look at our menu options on the right of the screen for advanced interaction, this menu will allow you to turn on and off the tank labels describing the tank components & virtually display the tank within a room.

Sectional tank Components

An overview of the purpose of each carefully designed component

What is an Inlet Connection?

Inlet Connection

This is where water enters the tank.

This can be various types I.e. Equilibrium Float Valve, Keraflo Float Valve, Tank Connection Only (with water flow controlled by level switches, or other control units such as TankTronic modules)


What is an Outlet Connection?

Outlet Connection

Water exits the tank here. Available in BSP threaded or PN16 Flanged

What is an Overflow and Warning Pipe?

Overflow Connection

The actual internal diameter of the pipe(s) installed should be capable of taking any possible flow in the pipe arising from any failure of the inlet valve.

Recommended that the overflow is 2x the inlet pipe diameter.

See Water Regulations 1999 sections 7.8 to 7.11 for further guidance.


Warning Pipe

The purpose of the warning pipe is merely to alert people to a fault and to an impending overflow.

Required on tanks with an actual capacity of 1000 litres or greater.

See Water Regulations 1999 sections 7.8 to 7.11 for further guidance.

What is a Lid Support?

Lid Support

Lid support designed to support lids in tanks that span over 1m in width and length.

What is a Inlet valve housing?

Raised Inlet Valve Housing

Enables the inlet connection for the tank to be fitted at a higher level.

This could be due to the requirement for increased actual capacity, or ease of installing certain air gap requirements such as an AB air gap type.


When is an External Ladder required?

External Ladder

Recommended where the height of the tank is greater than 1.5m. Optional safety hoops.

What is a Guardrail used for?


Edge protection is designed to be fixed to the top of the tank to prevent the fall of any person who has to climb on top for maintenance purposes.

This has to be risk assessed by the site/designer/end user as a requirement if deemed necessary.

What is an Access Manway?

Access Manway

Standard size 610x610mm Hinged or “lift off” option, depending on tank configuration can also be provided as 800x400mm lift off on a 1×0.5m panel.

Screened air vent supplied on both types.

When is an internal ladder used?

Internal Ladder

Recommended where the height of the tank is 1.5m or greater.

Climbing out of a smooth walled tank is not easy, strongly recommended for ease of access/egress during maintenance/inspection.

What is an Internal Tie Rods?

Internal Tie Rods

S/S 316 Grade A4 internal ties brace the tank from outward water pressure.

On tanks, 1.5m high and greater, with a footprint of 1.5×1.0m and greater.

What is a Stayplate?


External bracing support for internal tie bars.

Only required on certain tanks of 2.5m high and greater.

What is a Drain Connection?

​Drain Connection

A dedicated connection for draining contents of tank during maintenance/inspection is recommended.

Available in BSP threaded or PN16 Flanged

What is a Temperature Dial or Sensor?

Temperature Dial or Sensor

Available as either a visual dial readout or sensor to report back to BMS system.

What is a Level Switch?

Level Switch

High and/or Low. An electromechanical device that opens or closes a digital switch when the fluid in a given area reaches a certain level.

Commonly used to protect/control pump sets when low level is reached, or as an alarm warning when a high level is reached.

What is a 1x1m GRP Tank Panel?

1x1m GRP Tank Panel

Hot Press Moulded 1m x 1m truncated tank panel, insulated as standard, but can be provided as an uninsulated option.

Where connections are being fitted to a tank that particular panel will be changed to a flat panel to accommodate.


What is a 1x0.5m GRP Tank Panel?

1×0.5m GRP Tank Panel

Hot Press Moulded 1m x 0.5m tank panel, insulated as standard but can be provided as an uninsulated option.

What is a 0.5x0.5m GRP Tank Panel?

0.5×0.5m GRP Tank Panel

Hot Press Moulded 0.5m x 0.5m tank panel, insulated as standard, but can be provided as an uninsulated option.

What is a Primary Support?

Primary Supports

For Externally Flanged Base tank, normally set @ 1000mm centres @ 600mm high.

What is a Secondary Support?

Secondary Support

Steel used to cross Primary Supports where Externally Flanged Base tank is required to be supported @ 500mm centres, normally on Externally Flanged Base tanks of 2.5m high and greater.

Or where footprint configuration of the tank may cause access issues I.e. if there were a 0.5m increment on length/width two primary supports may end up too close together for safe access underneath.

What is an Internal Maintenance Division?

Internal Maintenance Division

Construction of one or more panels within a tank which divides the tank into two separate compartments.
Note: In any situation where there is only one water storage tank in a building, it is to be recommend that a weir or a division plate be used. This will facilitate maintenance of the tank without affecting the water supply to the building.

What is an AB Air Gap Spill Slot?

AB Air Gap Spill Slot

Cat 5 Tanks, also known as Type AB Airgap Break Tanks (Category 5 Backflow Prevention)

Category 5 risks are fluids that pose a serious health risk due to the concentration of pathogenic organisms or extremely toxic or radioactive elements present with them including any fluid which contains; faecal material or other human waste: butchery or other animal waste: or pathogens from any other source.

Water Supply (Water Fittings) Regulations 1999 in England and Wales and Scottish Water Byelaws state the installation of cold water storage tanks, connected to the public water supply must comply with the UK water fitting regulations. In order to meet these requirements, Category 5 Break Tanks must be used.


What is a Vent?


Opening to the atmosphere to allow for the movement of air resulting from changes in the water level so that the water always remains at atmospheric pressure.

What is a Sparge Pipe?

Sparge Pipe

A device used to achieve optimum circulation of water stored within a tank or cistern.

Its application is generally reserved for installations where space around a tank is restricted. Reasonable access to the tank side directly opposite the Mains Inlet is not available.

How to

How do I use the AR feature for training my staff/students


Benefits of working with Nicholson Plastics

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Expert Leading

Manufacturing GRP cold water storage solutions for domestic, industrial, agricultural & commercial industry sectors since 1968. 

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CPD Training

We have created a CPD training course to develop and improve industry professionals with the correct skills in specifying water storage solutions.

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ISO Certified

Our cold water storage tanks including WRAS approved, are manufactured to the highest quality and ISO standards.

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Team Tank Care+

We provide a dedicated customer support team to help with technical queries including drawing returns, delivery, installation & site support.