What is a GRP Enclosure?

If you have ever been in the market for a water storage tank or pump, you may have come across the term GRP Enclosure; however, unless you’re a specialist in the water plumbing business,  chances are that you aren’t too sure what the term actually means. In this article we’ll look at what GRP enclosures are, how they are made, and why GRP should be your first choice for water pump storage. We’ll also cover what you can expect from Purewater Storage when purchasing your enclosure.

What does GRP stand for?

GRP is a technical term which replaces the rather long-winded phrase, Glass Reinforced Plastic, which is a material used for making boats, construction, and most importantly, water storage enclosures. Sometimes the P might be translated as Polymer, or you may also see GRP written as FRP, meaning Fibre Reinforced Plastic, but it’s the same material.

How is GRP made?

Glass reinforced plastic is made by combining glass (fibreglass specifically) with a polymer resin. The glass fibres are applied to the polymer resin in layers, ensuring that each layer of glass fibres face in a different direction. By constructing the material in this way, the plastic is made stronger, enabling it to survive whatever natural environment you choose to put your enclosure in.

Worker cuts to size with a scissor,  sheet of fiberglass

Fibreglass sheet

How is a GRP Enclosure made?

Most GRP products are created by laying the hot fibre reinforced plastic into a mould where it can set into the perfect shape for your enclosure. This is essentially carried out in a five-step process:

  • The mould must first be checked for scratches, which are then filled and polished. The mould is then coated with a thin layer of liquid release agent. This will prevent your enclosure from sticking to its mould.
  • Next, the polymer resin is inserted into the mould, with hardener and pigment. The pigment defines the colour of your enclosure; Purewater offers green or grey enclosures but can provide other colours on request. The hardener reacts with the resin which causes the polymer to stiffen into the mould’s shape. This will be the outermost layer.
  • The fibreglass layer is added next, with more resin and hardener to seal it in place. More layers are added until the required thickness is achieved. Purewater’s standard is a 25mm thickness, which can be increased to 100mm for enclosures used in extreme weather conditions.
  • A final polyester gel coat is added to the interior layer to create a nice finish.
  • When cooled, the polymer and fibre mix is popped out of the mould. The GRP enclosure is finished.

a variation of different dyd polymer granulates

Polymer Resins

Why would I want an enclosure?

A GRP enclosure is a sturdy, cost-effective box with a twenty-five-year lifespan, not including the weather-prevention tactics you could be using to extend its life, such as extra coatings or repainting. GRP enclosures are also watertight, which is important for keeping your valuable equipment safe and dry.

GRP enclosures protect your equipment from the weather, but they also secure it from thieves and vandals. Purewater’s GRP enclosures are suitable for housing any of our own water storage tanks, pump sets and valves, but you can use GRP enclosures for storing other things, too.

In order to provide maximum protection for your water storage or tools, you can combine the sturdy nature of your GRP enclosure with a Yale-type night latch lock.

How will my GRP enclosure arrive?

When buying with Purewater, your GRP enclosure will usually arrive pre-assembled, but larger enclosures can be delivered in sections for on-site construction to suit your requirements. We will also supply our own engineers to reconstruct your enclosure on your site, if necessary.

blue water tank

Customisation options and accessories

You can adapt your GRP enclosure to fit your specific requirements. If you are using the enclosure to keep a water storage tank, for example, you may be interested in tubular heaters and thermostats in order to protect against frost or extreme weather conditions.

If you need your enclosure to allow for pipework to pass through the enclosure walls, we can also supply factory-prepared pad areas to keep your pipes protected. Similarly, if you are struggling for space, we can improve your enclosure’s accessibility by adding manways to the enclosure’s roof, or by providing a choice of either single or double doors.

Pure Water Storage is the company for your GRP enclosure needs, but more than just enclosures, we also provide a complete turnkey tank replacement service, support frames for your tanks, drip trays and so much more. If you’re looking for a company that fully understands the importance of secure water storage, get in contact with us.

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