Construction issues related to the gasket plate diagram
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Hello everyone. Please discuss whether the platform ladder shims and pipe support brackets shims for non-heat treatment equipment should be welded by the on-site installation company, or whether they should be welded by the manufacturer before the equipment leaves the factory. Nowadays, many design institutes do not provide specific shim diagrams for non-heat treatment equipment; instead, designers have to choose the appropriate components by referring to standard catalogs. I hope experts will actively participate in this discussion. Thank you
For non-heat-treatment equipment, whether there are pads under the platform ladder or not, it involves welding between compressive and non-compressive elements; such welds fall into Category E. As long as the welder performing the welding on site has the appropriate qualifications and can ensure the quality of the weld, it really doesn’t matter
Agree that Device 2# has heat treatment requirements, and the vast majority opt for welding by the manufacturer. If there are no heat treatment requirements, on-site welding is also acceptable. Individuals tend to have requirements regarding heat treatment or not; the shims on the equipment are installed by the manufacturer. Manufacturing plants have better construction conditions, and when painting is involved, it is more appropriate for them to carry out the work. :)
Technically, there is no problem with manufacturing and welding the gaskets for non-heat treatment equipment on site; however, it depends on the contract as to who will carry out these tasks. If the supply scope specified in the contract includes this, then the manufacturer must do it, whereas if it is not included, they may choose not to do it or request an additional fee. Generally, the bidding requirements specify that the manufacturer should provide ladder platforms and pipe rack connection plates.
For Class E welds that are subject to stress, PT or MT testing is required
The equipment has heat treatment requirements, and all welding is carried out by the manufacturer. If there are no heat treatment requirements, welding is usually done on-site.
Heat treatment is carried out in the workshop; without heat treatment, it’s done on-site. If all welding is done in the workshop, problems will arise on-site, and the installation team on site won’t make any money