How are non-standard pipe flanges calculated? DN400 needs to be paired with DN500, so only a custom design is possible
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I’m currently working on a conversion furnace that has an opening which serves as both a medium inlet and an access hatch. The opening that is directly connected to the head is of DN500 size and functions as an access hatch. The flange for this connection is selected according to JB/T4703-2000 standards at PN6.4MPa; accordingly, a 20592 type pipe flange with DN400 size is used. It is necessary to design the DN400 pipe flange in a non-standard manner so that it can match the DN500 flange. How should pipe flanges be designed? In SW6, there is only design information for equipment flanges – can it be designed and calculated using those standards for equipment flanges? Please ask experienced forum users to help solve this! :handshake
A pair of DN500 flanges can be used, along with an eccentric joint on the pipeline
There are calculations for flanges in GB150, which can be referred to
There are calculations in GB150, but it’s not possible to do them manually. Can we use the equipment flange calculation functions in SW6? The external dimensions are based on the DN500 flange dimensions for proper matching
This one. . Can a reducer be used to make the two flanges identical?
It’s okay to do it by hand occasionally too:lol
In my opinion, the inner diameter of the flange should be DN400, while the other dimensions should correspond to DN500. Use SW6 to calculate the equipment flange; it should be fine if it meets the requirements. The problem I encountered today is that the client insists that the flanges of the equipment must correspond to the nominal dimensions of pipe flanges. I carried out the calculations using the flanges of the equipment itself, with other dimensions taken from those of the pipe flanges.
Reply to 1# baoer417: If there are no restrictions regarding the location, it is recommended to use reducer pipes along with two flanges of different sizes; this will increase the cost though
Just add a elbow to the pipe and that’s it!
The last edit to this post was made by 30dman on 2010-9-17 at 12:58. Two options: 1. Reduce the pipe diameter to DN500; for the flanges, use those specified in JB/T4703-2000 with a pressure rating of PN6.4MPa and suitable for DN500； 2. It is recommended to add a reduction section with flanges welded at both ends. One end is connected to the DN500 flange, with the selection being based on PN6.4MPa as specified in JB/T4703-2000; the other end is connected to the HG/T20592 pipe flange DN400, and for this connection as well the HG/T20592 pipe flange DN400 is used. Simply put, it means having separate fittings at each end for the different diameters, and this increases the cost
This post was last edited by baoer417 on 2010-9-17 at 15:07. It is not possible to use sections with varying diameters, as a gas distribution device is also connected to the DN400 flange that is connected to the DN500 flange. I have no experience working with conversion furnaces, so I’m not quite sure what this gas distribution device looks like or how it is connected. Thank you all, fellow sailors. Those who have worked with converter equipment might as well share their experience with us; I’m really looking forward to learning from it. What I am working on is a Chinese-type conversion furnace; the material used is 15CrMoR, the design pressure is 3.3 MPa, and the design temperature is 455°C. This is my first time designing such a device, so I am still learning as I go……