As we are increasingly working with customers who are active in critical areas such as power plants, district heating systems and the like, where other series of standards are prescribed or recommended, we have to adapt the pipe clamps to DIN 3567-A/-B in order to comply with these regulations.
An ever-increasing proportion of the pipe supports are also hot-dip galvanized.
The fact is that heating steel, which is also defined as galvanizable, can lead to changes in the elasticity and hardening of the alloy and other metallic additives and thus to embrittlement.
The following specifications result from various standards or guidelines:
Guideline for pipe supports VGB-R 510 Part 1 and Part 2:
This guideline serves to increase the serviceability of pipe supports.
On page 22, it is pointed out that the minimum bending radii according to DIN EN 10025 must be used for pipe clamps that are cold-formed.
Institute for Hot Dip Galvanizing DASt Guideline 022:</strong
This guideline describes, among other things, the galvanizing guideline for forming in steel construction in order to avoid brittle fracture.
We have been using the S235JRC+AR material specified here for years.
This guideline also refers to DIN EN 10025-2 and ÖNORM EN 10025-2:2019 09 15 under “Proper forming” in section D.3.
ÖNORM EN 1090-2:2024 11 15
This ÖNORM mentions that cold forming leads to a reduction in ductility. It also states that hydrogen embrittlement or embrittlement can occur during galvanizing processes.
Description of the changeover:
The pipe clamps according to DIN 3567-A/-B that have been prescribed in all current standards to date stipulate a much smaller bending radius than the new guidelines and worksheets that we will be using in the future. When converting to the minimum bending radius in accordance with ÖNORM EN 10025 , the problem arises that this conversion increases the dimension “a” and thus also increases the “overall external dimension” of the clamp.
Changeover procedure:
We are gradually converting all pipe clamps to the new line.
All designations are given the suffix “pipe clamp similar to DIN3567-A/-B”.
As already mentioned, the bending radius “r” and the dimension “a” have changed compared to DIN. This may result in modified dimensions for final insulation work! All other dimensions remain unchanged.
All our drawings and technical documents will be adapted accordingly. As a result, all catalogs, data sheets and drawings that you have received from us with an issue date older than February 01, 2025 will lose their validity with immediate effect.
Affected are all pipe clamps according to DIN3567-A/-B made of material S235JR, P265GH, 16Mo3 and 13CrMo4-5 as well as all pipe supports where the DIN clamp made of the above materials is used.
This phase will take about six months, as not only the pipe clamps in the drawings will be changed, but also all of the approximately 30 thousand parts where these clamps are installed.
During this period, the drawing download on our homepage is unfortunately not available. If you need anything in this regard, please contact us so that we can send you the requested data by e-mail.
What does that mean for you:
Due to the sometimes minor changes to the main dimensions of the pipe clamp, the planner must check whether the pipe spacing is sufficient.
We did not take this decision lightly. However, we believe that this is the only way to guarantee the use of pipe supports in more sensitive areas and to achieve the best possible protection against brittle fracture or embrittlement when galvanizing, in order to be able to comply with increasingly strict regulations in the future.
Despite all measures to minimize risk, such as safe construction, compliance with legal standards and data sheets, a residual risk may remain.
If you have any questions, please do not hesitate to contact us!
