it is depending to its used pressure ,material and size

Originally Posted by waterboy

What are the advantages and disadvantage of a bolted silo and Welded Silo? New to industry and not sure what the difference is with these tanks?

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Or shouldn't that have read silage stores. There is an excellent textbook for silo design and construction lurking within these forum topics. Seek and ye shall find. You might even try Amazon or similar.

Whatever. Smaller silos are impossible to weld if they have galvanised panels. That is your starter for 10. After that it is downhill all the way regarding your selection criteria. Pressure and size are closely related and very roughly termed 'big'.

One striking advantage of welded construction is the ability to lift very large roofs with low pressure air. This saves a fortune in roof reinforcement which would otherwise be necessary if the roof was lifted by crane. Welded construction is time consuming and requires a lot of the NDT business before painting which is also a pain. On the other hand bolting is very expensive and almost as time consuming. Besides the 'airlift' there are some very novel ways to erect the tank walls. Spiral feed through used to be popular and still should be. Wind is another vital consideration. If panels are blowing around in the wind it is easier to locate them if they are ready drilled for bolting although I don't fancy the job at my time of life. Another factor is ease of testing. Some codes demand water leak testing, API is one of them. I don't, personally, see the need for this when solids are being handled. I mean the gap has to be bigger than the particle size...or what? I've had to transport 37 tanker loads of treated water to a remote desert site for silo testing and then the water had to be thrown over the sand because it was deemed unsuitable for testing the thickeners next door. Sometimes engineering can be a real pain.

In short: if it is tall and narrow go for bolted as a first option. ■