First of all, I am not a piping expert. My experience with asphalt tank projects indicates that B31.3 is typically used. But, I would sure like to hear that from others more knowledgeable.
Joe Tank
tc7,
I probably came across a bit crude and coarse in my last email I did not mean to sound that way. My apologies. Like you, I too try to get my ducks in a row before I have to deal with an issue. Regarding afvice from an AI, I do not consider then as all-knowing or all-seeing folks. I...
You need a copy of the applicable NBIC. Don't rely upon only the opinion of the AI. Nor should you rely upon only the info obtained from this forum. Go to the source of informantion... the NBIC Code.
Joe Tank
johnnick,
It's pretty straight forward at this point. You exceed the temperature limits of UG-20(f) for operation down to -20F (-29C) with out impact testing. Have you reviewed UCS-66 yet? It may also provide a path for impact test exemption as you state that low temp operation is not...
The idea of a standpipe is just plain dangerous. In order to handle the excess pressure on the roof the shell-to-roof joint must be string enough and the tank must be anchored. So if you have a large tank, you will not be able to afford the total cost. This is an engineering issue that should...
IFRs is right. API-650 does not recognize this type of roof, but it does not prohibit such a roof. You are on your own with regard to design procedures of the membrane roof and compression ring.
Joe Tank
Here's a website that includes SP8009, SP8019 and SP8032. Scan the document lits to be sure i gave you right numbers.
http://www.nakka-rocketry.net/sp8000.html
Joe Tank
metengr and JR97,
Thanks for the feedback. That's pretty much what I had heard from less knowledgeable folks than y'all (2 to 4 percent error on high side for SS when using CS block).
Joe Tank
NASA freely publishes an old series of documents that dealt with buckling of cylinders, spheres and cones. They were numbered "SP-XXX". I used them many years ago, but found them on the internet a few years ago. These papers are based on the seminal references that most modern design codes...
I've heard many times that SS welds require "special" considerations when inspecting by UT. My question now relates to thickness measurements. Is there much difference between UT thickness readings for CS and SS components when calibration is on a CS block. The components are typically tanks...
Bonswa,
Now I disagree. Get a copy of the curent version of API-653 and read 3.20(a) and (b) regarding nozzle sizes that constitute a major repair/alteration that reequires a hydrotest.
Joe Tank
First of all, API-653 reaaly doesn't cover much about riveted tanks, so you have to use engineering judgement about most things. For what you are trying to do, yes, I suspect you will have at least on third or more of it as a lap patch. I had similar problem and used a repaire plate that was...
JOM,
Steel does not "embrittle" at low temperatures. True it may have lower toughness, but that is a temperature dependednt problem. The steel's metallurgy is not permanently altered. When the steel warms back up, its just the same as it was previously to the cold temperature excursion.
Joe Tank
400m3 is not a very large tank. Why are you wanting to go with a double wall tank? That is actually quite a rare thing in a field erected ASTs.
Joe Tank
