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Depending on the size of the tank, an air test can be done to check for leaks. I would be confortable with this for large shop built tanks (>1000 BBL). I have also seen it done on tanks as large as (40' dia x 60' high). Sometimes a clean source of water isn't availible for a hydrotest and other...

In Algor you can choose how the surface interact. You may have the default contact settings set so they are bonded. Look up contact in the Algor help.

Does anyone have any tips on choosing time steps and other settings when doing Static Nonlinear analysis? Currently I have a large model of a tank using shell elements. I am using a nonlinear analysis because inside the tank their are large flat baffle that undergo an upset hydrostatic pressure...

If you are doing spacing calculations to stop the spread of fire you are probably doing it wrong. Why are you doing this calculation.

Probably starting at 1/4"

Thanks for pointing that out David. Marcosdias, if your client has low requirements you probably have to look at the burner turn-down on the unit. You will still get the same amount of heat out of the unit, whether or not it is water or steam.

You can have superheated liquid. In order for liquid water to turn to steam it needs a somewhere for the production of steam to start know as a nucleation point. Typically nucleation points are foreign material to the water or air pockets. HOwever if you have very pure water you can heat liquid...

In my expirience Algor doesn't like to mesh structural frames unless you do really fine meshes. This usually results in ridiculusly large models. You should really model this in Algor using beam elements.

Thats very true. If you could have 4 guys starting 90 degress apart and moving counter clockwise. That way you would only have to mark the starting points.

You may have issues with the refractory when you get below zero as well.

You say changes are not allowed, but what about having two saddles back to back, and doing an analysis like that.

It demonstrates being able to have different colors for different features, but can it do different colours for differernt surfaces.

It sounds as though shipping it would be more expensive than field building the unit. You would need a very large and expensive crane, you would need to fully skid the floor so it did not collaspe, you would need large external rafters as to not cave the roof. It sounds way more expensive than...

API 650 doesn't cover the design of rectangular tanks. For rectangular tanks I use good engineering practises to come up with tank wall thickness and stiffeners, then use API 650 weld procedures and inspection. It depends on the joint efficiency used. You can find that answer in Section 8 of...

Keep the ID's the same, it should help with internal corrosion. Or if it is being coated there will be less prep work.

You could weld on a temporary cover for the hydrotest.

No. But when you select the surface and "fix it". All the possible DOF's are restrained. For brick elements the rotational DOF's dont do anything.

Was you mesh size larger when you did the whole part? At first glance it looks as though your results are accurate.

I recomend phoning a professional. You have to understand where these chemicals come from to try to troubleshoot. NOx comes from high temperature combustion. CO comes from low excess air levels. If your O2 is still 4% it does not seem as though you should have high CO levels. Maybe your burners...

I have design 750 BBL double walls. It was for a location where the lack of secondary containment was grandfathered in. Then they needed new tanks, but the location was too congested to make putting up secondary conatainment around the tanks too expensive, so they decided to go with double...