For tank batteries, quantity has a quality all its own. Individually engineered field erected tanks have a schedule associated with them that is not generally conducive to gathering tanks based on the storage requirement per site. For storage tanks, it is more common to use some internal...
If your Procedure Qualification Report (PQR) is approved by an AI or is an AWS Standard Weld Procedure, and your internal quality assurance has a record of the Weld Procedure Qualification (WPQ) from the individual welder with a continuity record to back up continuous (usually monthly)...
In API 650 12th Edition, Addendum 3, paragraph 5.12.7 recommends using the AISI Steel Plate Engineering Data Volume 2 Part 5. Using the procedure in that standard and making your U-bolts from ASTM A36 material, it is possible to treat these as anchor chairs.
Given that this is a non-standard...
I would design to Annex M to be conservative. Additionally, there are other design factors incorporated into Annex M which may be applicable or otherwise improve the service life of the tank.
I agree with EdStainless that my first course of action would be replacement. If there is some reason this would not be feasible, I would machine in place, weld overlay/fill, and machine in place to within origin specifications.
Something to consider if you are using the machine in place...
Horizontal stiffeners will be of negligible benefit alone in resisting internal pressure. Used in conjunction with vertical stiffeners, there is a chance of success, although with significant cost. Replacing the shell courses, even a single sheet at a time, would appear to be more economical.
"Hexane like" refers to the volatility of the product stored. This is used as a reference to a product which will exhibit a significant evaporation rate at a relatively low temperature. This comparison is considered conservative, as most products do not have such a high volatility as hexane.
I recommend you calculate the force required to move the load radially inward (uphill) with that deflection. Include friction in your calculation. You may find that deflection unacceptable as the load will be difficult to move uphill, and will want to move downhill should the load be placed...
takiyasamsama,
Yes, 4.1.2 of API 650 permits the use of materials not covered in the standard, *if* the material can be shown to meet *all* the requirements of a material listed in the standard. If your material does not meet *all* the requirements of a listed material, it may not be used.
tylerdawg is correct. There are places to cut corners in business. This is not one of them. Hoists and cranes are cheap. Lawsuits and human lives are not.
First: The straight gauge is what I would choose to isolate the bending in the given plane.
Second: Is your material isotropic and of known modulus of elasticity? If both of these things are not true, it will not be possible to accurately calculate the bending moment. Also, very accurate...
I would have no reservations with welding a carbon steel base ring and anchor chair to the stainless steel skirt so long as the weld was made with appropriate filler and the carbon steel and weld were properly coated. Your client may think differently of this detail.
There is known glavanic...
I agree with JStephen that this, if possible, will not be economical.
In addition to the previous items, for 12F to API 650 you will require:
- Radiography of joints
- Hydrostatic test of tank
- Addition of anchorage for wind and/or pressure
- If no foundation is present, anchoring scheme to...
A vessel similar to the one you have shown would commonly be constructed to ASME Section VIII Division 2. This standard is detailed as to the radiographic and ultrasonic inspection required. These projects are quite involved and cannot be answered by individuals who do not have a thorough...
The most cost effective solution may be to cut the nozzle neck before the pentration and replace the neck and flange. This would be much easier than a button weld patch.
