Regarding the determination of SW6 for reinforcement-free pipe ends
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1. Can the calculation be done without reinforcement according to 150.3 6.1.3 38×3.5? Did the software take into account the negative deviation of takeover? 2. Should the pipe openings located more than 80% from the center of the head be calculated, as required in the solutions to Question 150 and the examples (page 36, Questions 3–18), even if they meet the conditions for exemption from reinforcement? :handshake
GB150.3 specifies that all requirements must be met: see the figure
This post was last edited by yechao25038 on 2019-4-2 at 16:22. Yes, the wall thickness of 38 is 3.5, and the software did not consider it exempt from reinforcement.
Clause 6.1.3 f) of GB/T150.3-2011 applies to steel; your fitting material is NCu30
I just did the calculations and found that when 38x3.5 aligns with the center line (in the case of a head), or is vertical and passes through it (in the case of a cylinder), no reinforcement is needed； Nothing else shows an indication – is there some issue? However, for 45x4, all cases show a fulfillment of 6.1.3, meaning it is independent of position.
The fact that he was able to get through with the first hint suggests that that material should work as well； Let’s take a look at the calculation using 316L:
It can be used, but calculation is required. Strengthening calculations cannot be omitted.
This post was last edited by fzujunru on 2019-4-2 at 19:01. SW6 sometimes has its own understanding, which does not exactly match GB150. After some calculations, it was found that for dimensions such as 38x3.5, 48x4, 65x5, and 89x6, whether they are located on the cylinder body or the end cap, any deviation of 1 mm from the center, or an angle of 1 degree between them and the normal line, means that calculations are still necessary – it’s quite strange
It refers to British standard pipes, right? So that 65x5 should be 60x5, right?
This post was last edited by zjq1962 on 2019-4-3 08:09. Since the nozzle in your example is an axial opening on the head, and the opening itself is oval-shaped, the size of this opening used for calculating reinforcement should be based on its major axis; it’s very likely that this value will exceed the combined diameter and thickness limits specified in GB150 for cases where no reinforcement is required. You can measure the length of the opening on the diagram to find out what its size is.
Based solely on the standards, does meeting the reinforcement exemption requirement of 6.1.3 suffice to exempt one from performing the calculations? (The standard does not specify the location and angle of the openings)