On July 1st 2014 it became a legal requirement for fabricators of structural components used in the construction industry to comply with the requirements of the CPR & CE marking requirements. While there are exceptions to this it is not at all clear to what degree it should be applied to the manufacture & supply of pipe supporting equipment & associated steel work. To be very clear about the situation, Pipe Hangers & Supports as defined by EN 13480-3 section 13 & associated appendices are intended solely for the purpose of supporting & distributing the weight & forces generated by the piping into the primary structure. They also allow for the displacement of the piping during plant operation. The connection point to the steel structure can be by direct bolted or welded attachment or by the placement of secondary steel members to provide a convenient connection point.
All attachments to the primary structure are either pre-fabricated by the structure fabricator or else made at site during the installation of the pipe supporting equipment. The loads & forces imposed on the primary structure by the pipe hangers & supports are known to & considered by the primary structure designer. Pipe Hangers & supports are therefore classified as a ‘second-fit’ to the primary structure & as such do not provide or enhance the structural integrity of the primary structure. They are designed in accordance with the requirements of BS EN 13480-3 which is harmonised with the “Pressure Equipment Directive” (“PED” 97/23/EC). CE marking under the PED is limited to parts that are welded to the pressure containment part. Because of this Pipe Hangers, Supports & associated secondary structural members do not fall under the requirements of either the CPR or EN 1090 when supplied by the pipe hanger manufacturer.
This extract is taken from the PSG catalogue: Design for Large Movement.
We can supply non-standard designs of types ES07 to ES12 to allow for movements greater than Range 3 (+/-37.5mm).
For pipework applications with very large horizontal movements, the standard design of PTFE / stainless steel bearing with the large upper plate may not be practical. Large lateral movement could cause the pipe shoe to twist around the pipe, or a twisting moment can be applied to the pipe which is also undesirable. In these circumstances, it may be preferable to install the bearing with the smaller PTFE-bearing plate at the top. PTFE on PTFE designs with overlapping strips of PTFE can also be considered. Note that an increased coefficient of friction will apply for PTFE-on-PTFE bearings and a lower bearing pressure should be used.
For ES07 to ES12 bearings at higher temperatures, you need to downrate the load capacity by using the graph showing máximum bearing pressure on P136 of the catalogue.
The V4 & V5 springs are recent additions to the product range. They will be added to PSDesigner in due course.
Suspended-type springs have +/- 75mm length adjustment. Base-mounted (pusher) springs have +/-25mm height adjustment.
The standard springs are suitable for 2 x design load (constant supports) and 2 x máximum load (variable supports). Greater test loading will require modified designs.
If you are using stand-alone PSDesigner, you just specify pipe size as zero. If you are using the SupportModeler-PSDesigner link, you will need to draw the assembly including the clamp base initially, then delete the clamp base from PDS.
The constant support is modelled parametrically in SupportModeler. It is necessary to specify the correct parameters. If you use the SupportModeler-PSDesigner interface, the correct parameters are specified automatically.
It doesn’t do this at present. This is one area we are now working on.
Elevations are included as input data when we model hanger systems in PSDesigner. Our problem is that we are not obtaining those elevations in our detail hanger drawings ( PDF or DXF files). Could you please provide us support or guidance about this problem?
In PSDesigner, click “Properties” button, “General” Tab and select “Show Elevation”.