Technical query?


Water Tank Frequently Asked Questions

What is GRP water storage?
GRP Storage tanks vary in size and construction, we manufacture one piece GRP tanks which can hold volumes up to 24,000 litres and sectional water storage tanks which hold volumes up to 1.3 million litres of water.
What is a division plate?

Division Plates are a construction of one or more panels within a tank which divides the tank into two separate compartments.

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 effecting the water supply to the building.

If you have the space to do so a two cistern set up is best practice.

Water tank leak test?

The duration of a leakage test should be a minimum of 24 hours, commencing at least 2 hours after the tank has been filled.

The test shall be carried out within 10 days of erection unless the manufacturer agrees to a longer period after assembly. The tank should be inspected at regular intervals and not deserted during commissioning (first filling with water).

Need to increase water tank capacity?

Did you know that you can add an internal upturned elbow to your overflow to increase the effective/usable volume within your water tank.

Talk to our team for options increasing the water capacity of your tank.

What is chlorination?

Chlorination serves not only for disinfection, but as an oxidant for other substances (iron, manganese, cyanide, etc) & for taste & odor control in water & wastewater.

What are GRP water tanks used for?

These water tanks can be used for a variety of applications including domestic, commercial, industrial and agricultural industries

What is the difference between potable and non potable water?

Potable water storage tanks are suitable for the safe storage of drinking water.  Non Potable water tanks are used for water storage that has not been passed for human consumption, but may still be used for many other purposes, depending on its quality.

Insulated vs Non Insulated GRP tanks?

Uninsulated water tanks which are manufactured for storage of process water.
Insulated water tanks are supplied with suitable connection in compliance with WRAS for storage of potable water.

What type of water tank do I need?

One Piece water storage tanks are ideal for cost effective water storage solutions, Sizes range from 43 litres to 24,000 litres. One piece tanks can be used for both indoor and outdoor storage purposes.
Sectional water storage tanks are ideal for where space restrictions are an issue, and for storing large volumes of water. Our tanks will hold up to 1,300,000 litres.
Multi-part tanks: These are idea for where area I restricted i.e loft space, basement space, they are also used widely in emergency supply of water as they can be dismantled and erected easily.

What is the difference between nominal and actual capacity & Nominal capacity vs working volume?

Nominal capacity: is the volume of the tank when it is filled to the top.
Actual capacity: is the volume of the tank when filled to maximum working level.

Is GRP Water Tanks Cheaper than Concrete & Steel tanks

GRP material is far less expensive than materials like concrete & steel. Lower installation and maintenance costs in industrial applications = very low lifecycle costs.level.

What are the advantages of choosing GRP Water Tanks?
  • High Strength Factor
  • GRP weights 1/7th the weight of steel
  • GRP weights ½ the weight of aluminum water tanks
  • Maintenance free
  • GRP tanks have a lifetime value of over 50 years
  • Lightweight
  • (Up to 80% lighter than steel & approx. 30% the weight of aluminium)
  • Long term cost savings
  • Highly corrosion resistant
  • Can be designed to suit most chemical environments.
  • Low installation cost
  • Impact resistant.
What is a format 30 water tank?

Is a heavy duty panel cover complete with screened vents, warning pipes and having roof panels and side walls insulated with encapsulated CFC-Free polyurethane foam insulation.

What size water tank do I need?

Use our Water Tank calculator to calculate the correct size tank.

What are the water Tank base requirements?

View our sectional water tank requirements

What is GRP water tank refurbishment?

Refurbish your tank with Nicholson’s Plastics and save up to 80% on tank replacement costs, get the most out of your water storage tank with a tank report evaluation & recommendation.
Contact us today!

GRP Water tank certifications

Nicholson plastics manufacture to the highest water storage standards, all the water storage tanks have been WRAS approved & are fully certified.

What is the maximum height of a tank?

4m high is the maximum height of a sectional water tank

What is the lead time on Sectional Water tanks?

Standard tank approx. 10-15 working days from receipt of approved drawing.

SpaceSaver tanks, please call to confirm as lead times for delivery can vary according to complexity of tank required.

How much clearance is required around the tank for installation and maintenance?

Clearence required around the tank for installation and maintenance

Do you provide an offload and positioning service?

This service can be offered by Nicholson Plastics at an additional cost, depending on location.

What is the lead time for a one piece or two part tanks

Approx. 10 working days. Express service is available please discuss with our sales team.

Where can I obtain an O&M Manual
Can inlet valves and connections be supplied with the tank?

Nicholson Plastics are able to offer both Equilibrium and Keraflo valves as well as a large range of overflows, connections and sensors.

Balance Pipes

Balance pipes are rarely used nowadays on new installations. Unless they are properly utilised/managed, they can cause shortcuts in crossflow and unintentional areas of stagnation.

Unless properly managed there is a potential for biofilm build-up within the pipe even at below 20’C.

On potable water tanks this could compromise water quality, cleaning the pipe would be extremely difficult without physically dismantling the pipe section, which would then require the tank to be taken off line fully.

In most instances the set-up on tanks of ‘all inlets one end’, and ‘all outlets the opposite end’, with an ‘equal tee CWDS manifold’ is used, which naturally allows the contents of each compartment to balance, while maintaining full crossflow, a much better configuration.

Water Regulations guidance.

customer service details