Pipe Clamps – The Complete Guide

Den komplette guide til rørbøjler

Hvad er rørbøjler?

Rørbøjler, eller rørfiksering er bedst defineret som support for ophængte rør, hvadenten de er ophængt horisontalt eller vertikalt ved siden af en overflade. De er vitale for at sikre at alle rør er sikkert fikseret, samtidigt med at de tillader enhver bevægelse eller ekspansion i røret, som kan forekomme.

Rørbøjler kommer i mange varianter, da efterspørgslen kan variere fra enkle fastgørelser til mere komplekse scenarier der involverer bevægelser i rørene og høj belastning. Det er vigtigt at den rigtige rørbøjle er brugt til at sikre installationens ydelse og bæreevne. Fejl på rørfiksering kan forårsage store og dyre skader på bygninger, så det er vigtigt man bruger de rette.

Hovedgrupperne af rørbøjler

standard piep clamps

Standard rørbøjler

Standard rørbøjler er typisk installeret ved brug af 2 skruer – en på hver side af rørbøjlen. De kan være forede med eller uden gummi, afhængigt af installationstypen og der et bredt spekter af størrelser der kan vælges.

Disse rørbøjler har udviklet sig og Walraven tilbyder nu en enkelt skrue rørbøjle med et låsesystem der lukker bøjlen enkelt ved at trykke den sammen med fingrene.

Bedst til lige installationer af metal eller plastrør.

Standard pipe clamps ➤

saddle pipe clamps

Traditionelle rørbøjler

Traditionelle rørbøjler inkluderer U-bøjler og sadel rørbærer, mest brugt til at at holde stål eller kobberrør. De har ingen indlæg, hvorfor de er bedst egnet til rør hvor der ikke skal der skal temperatur eller lydreduktion med i overvejelserne. Besøg vores blog som analyserer traditionelle rørbøjler mod heavy duty rørbøjler, for at se hvilken der er bedst.

Bedst til store stål og kobberør hvor almindelige beslag kan bruges og der ingen krav er på gummi indlæg.

Saddle clamps ➤


plastic pipe clamps

Plastic pipe clamps

Plastic clamps are mainly used on plastic pipes or domestic copper pipes. They are perfect for light loads and smaller diameter pipes. They are also great for jobs where lots of clamps are required due to their quick installation time.

Plastic clamps, such as the Walraven starQuick®, are now being manufactured for ultra-fast installation. You can simply fix the pipe in place without any additional fixings.

Best for sanitary, heating and electrical installations as well as corrosive environments.

Plastic pipe clamps ➤

heavy duty pipe clamps

Heavy duty pipe clamps

Heavy duty clamps have a high safe working load, so are designed for use where a heavy load support is required. They can be used indoors and outdoors and are available both with and without lining. They have modern features to make them easier to fit than traditional clamps. Take a look at how our heavy duty pipe supports were used to secure district heating pipes to the underside of a bridge.

Best for safe fixing of heavy load pipework indoors or outdoors.

Heavy duty pipe clamps ➤

pipe clamps

How do pipe clamps work?

In most instances, pipe clamps work by fixing securely around the pipe and suspending it from a surface or rail system. They simply lock around the pipe to clamp it in place so that it is secure. Since there are many different types of pipe clamp, however, you will find that they can work slightly differently.

  • Standard clamps work by securing two screws in place, one on either side of the clamp. More state of the art versions of standard clamps can include single screw pipe clamps for faster fixing and more advanced two screw clamps that have additional features such as anti-loss washers and captive locking nuts and screws.
  • Saddle clamps work by fixing over the top of half of the pipe, whilst the other half sits on a flat surface.
  • Plastic clamps can work in different ways. In the case of the Walraven starQuick®, it is usually fixed to the wall with a screw or plug and you simply push the pipe into the clamp and it will close on itself for ultra-fast and secure fixing.
  • Pipe hangers or U Bolts allow the pipe to sit into the bottom section of the clamp. The hanger is typically fixed at the top to a piece of strut.

We make it easy to use pipe clamps

When looking for a simple and fast pipe clamp installation, a single screw clamp is the answer. The Walraven BISMAT Flash is a unique, state of the art product that requires no tools to fix the clamp in place. You simply use one finger to push the screw and lock it in place. The Walraven BISMAT Flash is particularly useful when fixing long runs of pipe as you can save up to 40% fixing time.

The images below show you just how easy the Flash is to use.

adjustable pipe clamp

rubber pipe clamp

standard pipe clamp

Which pipe clamps are the best?

When it comes to selecting the best pipe fixings for a job, there is no ‘one size fits all’ solution. In fact, selecting the best fixings depends on each unique installation environment and application requirements.


What needs to be taken into account when selecting the best pipe clamp?

pipe clamps and hangers


Temperature variations can cause pipes to expand and contract. If the correct fixings and clamps are not used to take into account the pipe movement due to temperature changes, the installation could fail and cause damage to the building.

Before you can select the right clamps to deal with thermal expansion, you first need to calculate the level of thermal expansion on the pipework.

pipe clamps fittings


All pipe clamps have a maximum load bearing capacity, which means you need to select a clamp which is suitable for supporting the load required.

As an example, you may require special heavy duty pipe clamps with a high safe working load to ensure the pipes are secured properly. These can also help you achieve maximum bracket distances between clamps as they are able to take more force.

pipe clamps u bolts


Pipes made from different materials will react very differently in certain scenarios. For example, there are many different types of plastic pipe (PE, PVC, PA, PP etc). Each has a different temperature resistance, and different resistance levels to chemicals such as oils, greases, acids, chlorine etc. This can affect what type of clamp should be used. For example, plastic pipes should usually be secured with a lined metal clamp or plastic clamp. An unlined metal clamp can lead to corrosion if used on a plastic pipe.

Then there are different types of metal pipe – steel, iron, copper and so on. This can determine what kind of pipe clamp can be used, for example, stainless steel pipe clamps cannot be used to fix a copper pipe as the two metals will react. So a nylon coated or plastic clamp must be used.

pipe clamps u bolts




adjustable pipe supports


The size of the pipe will influence the type of clamp you need, since all clamps will only be available in certain minimum and maximum diameters. For example, single screw clamps often have a more limited size range as they have to hinge open on one side, so are suited to smaller pipes.

Larger pipes will often need two screw clamps, traditional fixings or heavy duty clamps which are manufactured to suit larger sizes and heavier loads.

pipe clamps and brackets


The environment into which your pipe clamp will be installed can affect the type of clamp you should use. For example, if the installation is external and exposed to the weather, this is an important consideration and will more than likely require a pipe clamp with a special coating for corrosion resistance. Many of our standard pipe fixings are available with our special corrosion resistant coating Walraven BIS Ultraprotect for outdoor use.

If you are installing within a chemical environment or wet environment like a swimming pool, you may require a special kind of plastic clamp such as our Walraven starQuick.

pipe clamps plastic

Special requirements:

Some construction projects can have special requirements such as noise insulation or fast installation needs. In these cases, there are specialist clamps that can be used.

For example, if the requirement is to install the pipe clamps as quickly as possible, a one screw clamp that requires no tools would be better than a two screw clamp.

For noise insulation, pipe clamps with rubber lining will provide soundproofing. Many of Walraven lined clamps have certified levels of sound insulation. Find out more about soundproofing your installation.

pipe clamps quick release

pipe clamps and supports

pipe clamps bar clamps

What size pipe clamp do you need?

To determine what size pipe clamp you need, the most obvious thing you need to take into account is the size of the pipe. This is usually measured in NB (Nominal Bore) or O/D (Outer Diameter). This will determine the diameter of the pipe clamp that you require. See our handy chart below for converting NB pipe sizes.

Secondly, you need to consider whether you are installing the clamp over insulation such as phenolic or wood block, as this will increase the diameter of the clamp you require.

At Walraven, we have a huge range of adjustable pipe clamps that fit 99% of known pipe sizes, including clamps suitable to install over insulation. The smallest clamp in our range is 12mm, the largest is 1200mm. Even if your pipe is outside of these sizes we can manufacture custom pipe clamps. Get in touch with us to see how we can help your next pipe clamps project.

Conversion chart for NB pipe sizes

We have created a useful chart to help you convert standard pipe sizes from NB to O/D. This will help ensure you purchase the right size clamp for your pipe. The chart covers standard pipe sizes for steel and copper pipe.

You can get your copy by clicking the image below.

pipe clamps


Pipe clamps with rubber lining

Some applications require pipe clamps to have a rubber lining. This is often a requirement due to the material or temperature of the pipe. Lined clamps also offer noise insulating properties. There are three main types of lined pipe clamps.

rubber pipe clamp

Black lined clamps:

The black, EPDM rubber lined clamps are suitable for steel pipes. This is because they have a series of ribs on the inside of the lining that grips the pipe so that they cannot move. They anchor the pipe securely. If required, pipe movement can be dealt with via fixing accessories such as ball swivels or expansion devices.

rubber pipe clamp

Green lined clamps:

Green, EPDM rubber lined clamps are specially made for plastic pipes. They are finished with a smooth surface, making it easy for plastic pipes to slide within them. This prevents any fixings being forced out of place.

rubber pipe clamp

Red lined clamps:

Red, silicone rubber lined clamps are used in extreme environments. The red lining on these clamps is made from silicone that is heat resistant up to 200°C, making it perfect for very hot pipes.


Top tip – storing pipe clamps

The storage environment for pipe clamps only rarely has an impact, especially if you are able to store them in dry, stable conditions. You should be careful, however, if you store clamps with EPDM linings in a location with temperature variations. Lined clamps have been known to become brittle at very low temperatures and can melt at very high temperatures. So it is best to avoid temperature extremes.

It’s always best practice to check the documentation on the recommended storage conditions for the clamps you’re using. Again, do talk to us if you have any concerns.

pipe brackets and pipe hangers

pipe supports

What are the advantages of Walraven’s pipe clamps?

u clamp for pipe support

Extensive range of clamps

We have a vast range of pipe clamps and brackets for fixing pipework, that covers 99% of all known pipe sizes and pipe types. Even on the rare occasions when you have a pipe that our standard clamp range doesn’t cover, we can often manufacture bespoke clamps for your project.

pipe clamps unistrut

We have technical calculation and design tools

As a global company, we have invested in state of the art technology which allows us to be as accurate as possible when making calculations and designing effective pipe fixing installations for our customers.

sliding pipe clamp

100% quality control
Unlike some other pipe clamp manufacturers, all of our pipe fixings are manufactured within our factories at Walraven. We don’t outsource anything, and so we control the manufacturing process from start to finish. This means we have 100% control over the quality of our products at all times.

water pipe clamps

We offer full project support

We recognise that sourcing and specifying pipe clamps can sometimes be complex. Our team of Technical Support Advisers provide a FREE project support service to our customers including consultation and problem-solving.


pipe clamps uk

High levels of corrosion resistance

Corrosive environments are graded from C1 (low levels of corrosion in the environment) to C5 (highest levels of corrosion expected). Walraven manufacture pipe clamps and fixings that are suitable for use in C1-C4 environments.

adjustable pipe clamp assembly

Products to deal with pipe movement

Our pipe clamps and associated fixings such as slide guides, expansion devices and fixing points can be used to ensure that pipe movement can be dealt with effectively, removing the risk of installation failure due to thermal expansion.

quick release pipe clamp

Extreme testing

We go above and beyond when testing our pipe fixings. Not only do we test to RAL approved standards, in-house we test our clamps to destruction, so we know exactly how good they are!

aluminium pipe clamps

We can provide the entire pipe fixing system from anchor to clamp!

We can provide much more than just clamps for pipes, we manufacture every component you need for the complete pipe support system. From anchors to rails/strut and all the additional accessories required are all available from us. We can even prefabricate entire systems, eliminating hours of installation time.

Pipe clamps around insulation

Walraven’s CE marked phenolic pipe support inserts (Walraven Phenblox®) are used in conjunction with unlined clamps to provide thermal insulation around pipes. Our special bore coating eradicates any possibility of pipe corrosion on copper pipes and stepped joint faces ensure a vapour seal and accurate location.

We’ve designed our phenolic insulation to be compatible with almost all unlined pipe clamps whilst retaining the best available thermal insulation properties available. Phenolic insulation is much more cost effective than wood, calcium silicate or foam glass alternatives due to a higher insulation value. Read all about insulated pipe supports here. 

Take a look at our Walraven Phenblox® brochure which includes a handy table to help you select the right phenolic and pipe clamp combination.

To find out more about what the CE Mark means and why it’s important to have this accreditation, click here.

See our Phenolic selection tables ➤

pipe clamp insulationpipe clamp insulationpipe clamp insualtion

The Walraven complete pipe support system

As well as manufacturing an extensive range of pipe clamps, we also manufacture all of the individual components that, when used together, create the ultimate pipe support system. This includes parts such as:

The image below shows one example of a complete pipe support system we have delivered.

pipe clamps for unistrut

Do you have a question about pipe clamps?

If you have a question about one of our clamps or a niggling question about pipe support systems as a whole, then please contact us using the form.

Our experts will be on hand to provide you with any knowledge or technical information that you require.

Pipe Clamps Advice

How do I choose the right bracket fixing distance?

Unfortunately for installers, there are no official guidelines or standards for bracket distances between pipe clamps. The major downfall of this is that sometimes, the bracket distance can be made too wide and result in the pipes starting to bend.

Fixing pipes efficiently – the right way

An efficient way of fixing pipework is securing multiple pipes to one bracket.

As a suggested rule of thumb, the individual pipe with the shortest required bracket distance should determine the bracket distance used.

The maximum bracket fixing distance (according to manufacturers)

Pipe manufacturers will usually provide you with a maximum permissible bracket fixing distance. This distance is determined by the combination of the pipe material, the diameter and the weight of the pipe.

With steel pipes the bracket distance is generally permissible up to 6 metres, but in practice you rarely see this as installations can be complex.

Talk to a Walraven expert to determine the best solution

We have been in the pipe fixing business for over 75 years so we have the knowledge and expertise to advise you on how to determine the correct distance between clamps to ensure a safe installation.

Read the full version ➤

pipe fixings and clamps

Learn more about pipe clamps

pipe clamps and supports

‘How-to’ guide on soundproofing 

Pipe clamps can have a significant contribution to the overall noise reduction in your building.

Learn more ➤

pipe clamps and fittings

Self-closing pipe clamps

Take a closer look at the Walraven starQuick®, the self-closing plastic pipe fixing.

Learn more ➤


pipe clamps bar clamps

‘How-to’ guide on corrosion

Depending on the application, it is possible that your pipe clamp, if not chosen correctly, can begin to erode itself or the pipe.

Learn more ➤

pipe clamps quick release

The fastest fitting pipe clamp

Take a closer look at the Walraven Bismat Flash, the fastest fitting clamp on the market.

Learn more ➤

Other useful links

pipe clamps products

Learn more about RAL quality marks

Take a closer look at RAL’s testing requirements and accreditation.

Learn more ➤


pipe clamps rubber lined

60-second video covering RAL quality marks

This short video will show you why RAL quality marks are so important in today’s construction industry.

Watch now ➤

stainless steel pipe clamps

LUL authorised products

Learn more about products that have met the London Undergrounds requirements and have been authorised for use within the network.

Learn more ➤

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