Requirements for straight pipe sections when large diameter tees are connected to valves
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I am currently working on a project, in which a stop valve (also DN1200) needs to be added to the branch pipe of a DN1200 tee pipe. The master said that the safety distance from the tee weld opening and the position of the pipe support below need to be carefully considered when installing the valve. However, I think the valve is flange-mounted, so there is no need to consider the distance from the tee weld opening. Only the bottom of the straight pipe section is enough to install the pipe support. Isn’t it only necessary to consider the distance of 1.5 times the diameter of the straight pipe section if it is also a welded connection? If not, are there any relevant regulations for this situation? The distance between the valve and the three-way port is now 130cm, which should not affect loading and unloading.
1. Regarding the distance of welds, there are clear regulations in GB 50235-2010 "Construction Specifications for Industrial Metal Pipe Engineering", the excerpt is as follows: 2. DN1200 stop valve? So big? What working conditions is the poster's stop valve used for?
What is the rating of DN1200 valve? If it is determined that the valve is of flange type, the butt-welded flange does not need to consider the welds between the flange and the tee. If the valve is welded, the convenience of valve operation and maintenance needs to be considered. The central elevation of the valve stem is generally 1.2 meters.
For such a large pipe diameter, it is best to ensure that it is 200-250mm to avoid excessive cutting deformation and affecting welding.