Diaphragm air pressure tanks require strength verification for those components
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The calculations are carried out at a pressure of 1.0 Mpa and a temperature of 80°C. Previously, the 16508 standard was used for calculating the strength of boilers, while now the GB150 standard is applied to containers. What calculations or summaries should be included in the strength-related data provided with the product upon departure from the factory? (The base and lifting lugs also have algorithms, so they probably aren’t needed.) For known tanks, with two thick connections at the top and bottom, as well as tube bases for the two gauges, it is necessary to prepare a calculation report; there are no issues with this. Formulas GB150 and 16507 are the same; the corrosion allowance changes from 0.5 to 1, and SW6-2011 also provides assistance. It can be resolved in three minutes. I haven’t done the calculations for the following points; am I correct? 1. For a single circular opening in the center of the flat cover, with a thin tube connected to the flat cover, the flat cover connected by bolts is calculated as a flange structure according to Chapter 7 (page 162 refers to dop > 0.5Do; it seems that the thin tube does not meet this requirement). 2. Should the elbow at the very bottom be calculated using the specifications for elbow 20582? 3 vertical vessels, with a cylinder length of 1650 mm – how to handle the static column pressure? Please, experts, show me the way
Treat SW6 as suitable for pressure vessels, and select the flange at the bottom connection as a standard flange. Then, treat the pipe connection and flange cover at the lower flange as a small container, and make reinforcement by drilling holes. The elbow has not been calculated in detail; it is simply treated as having the same wall thickness as the pipe, with the outer diameter being used for calculations as well, considering the pipe as a pressure vessel.
It is advisable to have a section of straight pipe at the upper end of the elbow or bend at the bottom, to facilitate welding to the flange cover; this also helps with the installation of fasteners.
This post was last edited by wanlirn on 2019-5-7 at 13:55. The upper and lower parts are flanges; this thing is pointless. Do you want to introduce new products? The price is already very low; the profit per unit is only 100–200, and moreover, heat-shrink wrapping is required. My friend’s company has been doing this business for a long time, delivering over 100 units per day as part of their regular volume of orders
The wall thickness of the pipe is specified on the page for containers GB150 or other standards.
Based on the calculation experience of 16508, for example in the case of water wall tubes that are subjected to internal pressure, the thickness of these tubes decreases after bending. During calculations, the straight sections and the bent sections are calculated separately, and the maximum thickness as well as the minimum pressure values are taken into account. It doesn’t seem appropriate to apply this approach to containers
Out of concern, compare the pipe calculation with the minimum forming thickness required for the pipe; use the larger of the two values. Another thing: a little extra margin of one or two mm can be added at the elbow, which won’t increase costs much while still ensuring proper flow.