When is a three-saddle support used for horizontal containers?
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Standard NB/T47042-2014 states that b) when the length L of the cylinder is too large, a structure with 3 or more saddle supports can be considered. This statement is rather vague, and the standard does not specify either what range of L/D values is suitable for using three saddles I have a horizontal tank with a diameter of 4190 mm and a length of 31050 mm. Do I need 2 saddles or 3 saddles?
Generally, the length-diameter ratio of double saddles is within 5; when it exceeds 5, it is better to use 3 or more saddles.
Do the calculations; with all factors taken into account, it should remain stable, right?
When the length-to-diameter ratio is too large, the bending moment between the two saddles becomes excessive, exceeding the allowable range.
As long as all the criteria for the strength calculation of the dual saddle are met, the dual saddle should be used whenever possible. Three saddles are only used as a last resort, as issues such as ensuring strength under uneven settlement are very difficult to address.
Think of the barrel body as a beam, a simply supported beam; it’s sufficient as long as the bending stress and deflection meet the requirements； All that’s left is to check the saddle.
It doesn’t seem like there’s any ban on using them; on some occasions, customers themselves request three of them. If they are long and heavy, it’s fine to use them. I don’t have much experience, so this is just my opinion. In the case of three saddles, usually one is fixed in the middle while the others can be moved around. http://bbs.hcbbs.com/thread-1386227-1-1.html
I’ve seen those with three saddles; the container is indeed quite long!
Three saddles solve the problem of instability~
Since a comparison needs to be calculated, it’s impossible to set things too rigidly