Selection of container supports made of chromium-molybdenum steel
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This post was last edited by Ye Tang Zhuang Shang on 2020-7-27 09:27. It is a equipment operating at atmospheric pressure, with a temperature of 500 degrees; the material used is 15CrMoR. Should it be designed in accordance with GB150 standards? The material 15CrMoR is not listed in NBT47003.1. There is also the option of container supports; I see that according to the standards, supports with shims cannot be used. Are there any shims without supports? Also, I would like to choose a supported bearing; aren’t there any supported bearings without shims as well? For the bearings of the new standard, the operating temperature has been added as a parameter; the value for supported bearings is 200. How should this be taken into account?
1. NB/T 47001-2009 does not contain a section on materials; it refers to GB150. There is no conflict between these two standards, so they can be applied simultaneously； 2. I haven’t seen any standard stating that brackets or supports with shims cannot be used; generally speaking, those with shims provide better load-bearing capacity than those without them ； 3. NB/T 47001-2009 \"Types and Basic Parameters of Horizontal Steel Liquefied Petroleum Gas Storage Tanks\" – this standard applies to horizontal storage tanks, which are generally supported by saddles. Lug ears and support-type bearings are both designed for vertical containers ； Your understanding of the scope of application of the standards is quite confused. When evaluating a standard, the first thing to consider is its scope of application; if it’s not applicable, everything else is meaningless ； 4. Regarding the design temperature, it is necessary to consider the impact of temperature on mechanical properties such as stiffness and strength; generally, if the temperature is too high, reinforcement is required.
Experts, please come by whenever you have time to give us some guidance!
A backing plate without ears – that’s definitely available
There is a theory suggesting that shims should be avoided as much as possible, since they increase the restraint on the fillet welds; it’s not that shims cannot be used at all
According to that standard, the temperature of the support is limited to 200 degrees; mine is over 500 degrees. How can this be resolved?
I’m sorry, I got the standard number wrong; it’s 47003.1. The training manual states that shims should not be used for chromium-molybdenum steel
Use materials resistant to high temperatures and calculate based on non-standard specifications… This isn’t the only option; other methods depend on the conditions of your equipment
1. According to NB/T47003.1-2009, Section 5.1.2, steel materials listed in GB150 can be used as steel for containers. 2. The training manual states that \"when a vertical container has a small diameter, low height, and light weight, a lugged support structure is often used; in such cases, it is important to avoid using lugs with shims.\" I’m not sure what the size of your equipment is – leg-type supports come in both those with shims and those without them. The training manual also mentions that \"when the container temperature is high and the rigidity at the joints is high, a heat box structure should be employed to reduce the thermal stress caused by excessive temperature gradients at the joints.\" I hope it’s of some use to you.
Vertical equipment, 2000 high, DN800, weight 400kg. I would like to use a supported bearing. I also have a question: what is the structure of a heat box?
This post was last edited by wx_Catherine_Mi on 2020-7-28 at 12:06. Whether to use a support type or an ear type depends on the manufacturing process and where it is intended to be placed. Not using shims is to avoid cracks; if this issue can be resolved, then there’s no problem. Anyway, since heat treatment is required after welding, just weld the shims together as well and then carry out the heat treatment. That’s what I think; please correct me if I’m wrong. I also found this information with the intention of learning*, so I can’t help you with anything else – my skills are only mediocre.