Walraven: How to prepare best for a secure pipe fixing

Quick, easy and safe installation
How to prepare best for a secure pipe fixing
They must be quick and easy to install and hold securely. These are, in brief, the requirements for modern pipe fixings. To ensure that their good properties are also brought to bear, it helps to determine beforehand which pipe fixing is the most sensible in each individual case. The following questions and answers simplify the selection

1. What is the purpose of the pipe?
The pipe fixing to be selected depends on the type of medium flowing through the pipe.

  • For hot pipes, such as heating pipes or domestic hot water pipes, pipe clamps with or without sound insulation inserts are available, depending on requirements.
  • Cold pipes require cold block fixings. They prevent water vapour diffusion and the resulting moisture damage such as corrosion by condensation. If special attention is paid to low smoke development in case of fire, special cold pipe clamps are used (see picture BISOFIX cold pipe bracket E13+ and E19+ s1s2 application).

2. Light or heavy pipe?
Requirements on the load capacity of the pipe clamp depend on the weight of the pipe and the fixing distances. Larger fixing distances reduce, for example, the number of fixing points required with clamps, anchors and threaded rods, and at the same time reduce the amount of installation work involved.

3. Singlefixing or rail support?

  • With a single fixing, each pipe is mounted individually. Single fixings are often found in smaller building projects such as detached and semi-detached houses. It usually consists of a drop-in anchor that is placed in the reinforced concrete ceiling, a threaded rod or stud bolts and a pipe clamp.
  • Mounting rail systems are primarily used in larger objects such as huge residential and commercial buildings or industrial facilities. The advantage of these systems is faster installation, less drilling and anchoring work and greater flexibility, as only one profile rail is attached to the ceiling, to which all pipes are installed using installation accessories, for example Hammerfix and a pipe clamp mounted on it (see picture above). Mounting rail systems are used when
    • several pipelines are laid side by side
    • is fixed to reinforced concrete ceilings. In practically every newer type of ceiling, the reinforcement is three to four centimetres from the lower edge of the ceiling and covered by concrete. It can happen that steel is hit while drilling. In this case a rail is more variable.
    • pipe expansions must be taken into account. It is worth installing a rail if sliding pieces or sliding guides have to be fixed (see picture fixing point sliding rail).

4. Do sound insulations requirements need to be considered?
The legal basis is DIN 4109 as the requirements and assessment basis for structural sound insulation introduced under building law. The standard protects people who spend time in normal living and working spaces within buildings. If sound insulation requirements exist (e.g. housing, office buildings), pipe clamps with sound insulating inserts (see picture Bifix_G2_with insert) must be used.
In industrial buildings, for example, the basic noise level is often so high due to the manufacturing process that no additional sound insulation requirements are imposed on the installations. In warehouses, too, there are often no sound insulation requirements; here too, pipe clamps without inserts can be used (see picture Bifix_G2_without insert).

5. Are fire rated fixings required?
Fire-rated (or tested) fixings are required in escape and rescue routes if flammable materials are installed in the ceiling area that are sealed off by a false ceiling that is effective in the event of fire. In this case, all installations in the false ceiling area must be fire-proofed.

6. Are there any enviromental influences to be considered?
Depending on the prevailing environmental conditions (indoors, outdoors, near the sea), it may be necessary to select corrosion-resistant (galvanised or hot-dip galvanised) or non-corrosive (stainless steel or HCR steel) versions when selecting the material for the pipe fixing.

7. Temperature effect of the flow media?
If the medium flowing through the pipe is hot water or high-pressure steam, the pipe temperatures usually reach more than 110 degrees Celsius. Since EPDM inserts are only suitable for permanent temperatures of up to 110 degrees Celsius, high-temperature-resistant materials such as silicone (see picture BISMAT_2000_S) or Teflon are used here.

Modern pipe fixings meet high technical requirements. Properly installed, they ensure the safe and reliable fixing of pipes. Every fitter has a different focus when selecting pipe fixings. While one uses low-cost but time-consuming twin-screw clamps, the other prefers pipe clamps with quick-release fasteners to save installation time and increase installation convenience, for example in overhead installations.

Author: Thomas Geißler – Head of engineering and project management at Walraven GmbH