Earl and the Aboveground Storage Tank Forum for fuel tanks, plastic tanks, fuel oil storage tanksWelcome to the aboveground storage tank forum, a bulletin board dedicated to tanks, fuel tanks, plastic tanks, fuel storage tanks, and above ground storage tanks (AST) API650, API653 & UL142 aboveground storage tanks (AST) and chemical plastic tanks. Remember the forum is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
 
Sponsored by:
Contact us about advertising
Earl   AST Forum  

Bottom plate in welded steel petroleum storage tan

Wednesday, August 29, 2018   By: ksm208@gmail.com [1945] 0 Stars
In a newly constructed ATF tank due to settlement the slope of bottom tank is towards annular plate. Due to this water settles around critical zone in tank bottom.

This is not allowed in ATF tank to overcome this another plate is welded from shell to bottom so that slop is toward the center of the tank.

My query is whether this welding will have effect on load on bottom plate and if so what else is suggested to correct the slope of bottom plate from outward to center.

Thanks

Post a Reply...
Viewed 124 times

Thursday, August 30, 2018   By: Orlando Costa [201] 2 Stars
You mean you have the suggestion of soldering plates under the existing plates bottom. Thats right?

I would think about another suggestion: depending on the diameter of the tank, it would weld plates to compensate for the inclination required using API 653, see itens 9.10 and 9.9.2 as a reference.

Of course, a project correction document signed by an Engineer certified by API 653 will be required. Considering details such as nozzle level, need to fill the space between the plates, dimensions required of the new plates to avoid tensions and others.

Post a Reply...
Viewed 88 times

Friday, August 31, 2018   By: Orlando Costa [201] 2 Stars
However, the plates to correct the problem would be welded over top the existing bottom.

Post a Reply...
Viewed 81 times

Wednesday, September 05, 2018   By: Orlando Costa [201] 2 Stars
Depending on the dimensions as the angle of inclination of the existing bottom and others details of your tank you can use API-653 -9.10.2.1.1 to 9.10.2.1.6 - Replacement of entire Tank Botton.

I worked on a similar case in the past. See an attached sketch.

Picture

Click on picture for full size view or to view PDF!

Post a Reply...
Viewed 62 times

Monday, September 03, 2018   By: BABRTs973 [53] 5 Stars
Was this tank built with a cone up, cone down or flat profile. If it is a cone up or flat you may have to raise the nozzles to slot the shell for new sketch plates allowing drainage away from the shell.

Not knowing the size diameter and height also makes for a shot in the dark.
If it is a cone roof less than 10 meters diameter you may be able to lift the tank and reprofile the base material for drainage to the center then set the tank back on the foundation.

But never in any circumstance should plates be laid on the existing floor and filet welded to the shell. The shell needs to be notched and the sketch plates inserted through the shell and welded on both sides.

Post a Reply...
Viewed 53 times

Sunday, September 23, 2018   By: Karsadi [652] 4 Stars
Dear Sir,

Maybe other ways can be considered as follows
To change the slope of the existing bottom tank, it can be done by installing a new bottom plate above it, without dismantling the old bottom plate and installing a new bottom plate above it by making the bottom slope in accordance with the plan by implementing Double Steel Bottom Construction
If a double steel bottom is used, the details of construction shall provide for the proper support of the primary bottom and shell for all operating conditions. The design shall be evaluated to verify that the primary bottom and shell are not overstressed. The evaluation shall consider all anticipated operating conditions such as design metal temperature, maximum design temperature, fill height, hydrostatic testing, seismic conditions, and tank settlement.

The evaluation is not required if the primary bottom is uniformly supported on both sides of the shell and is not structurally attached to the secondary bottom or primary bottom support.

For double steel bottom systems that use steel members such as grating, structural shapes, or wire mesh to separate the bottoms, ingress of water between the bottoms will result in local accelerated corrosion rates. If the perimeter of the bottoms is not sealed, corrosion protection of the tank bottoms shall be provided.

Thus hopefully it provides an overview of the benefits.

Best Regards

Post a Reply...
Viewed 34 times

Published on ast-forum.com

 

Featured
Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.
------------------

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

A similar a....   Read All
 
fiogf49gjkf0d

It's hard not to look at this ad at least once, then you go to the next page an notice it again. Maybe you will not read the message, but you will be thinking about the brand and we call that brand impressions.

About 2/3 of internet traffic is useless traffic and consist mostly of malicous-bad-robots.  However, there are good robots too.  We block bad-robots, and allow the good one's through, but we just do not count the good one's.  We want good straight-brand impressions for our advertisers with human impressions.

Imagine your static or animated display advertisement placed here, and if that is not enough you can include text too to expound on the virtues of your services and or products.    In addition, you can benefit by using our new advertisement feature to have your video included in your ad space.  Wow, make an infomerical with text and a display by combining all features to enhance the readers or audience's experience using your brand.  Ads can be much more than a static display ad. Here is an example of how your video could be used or position in this ad space

 

Caption: Public domain video showing a CB&I (Chicago Bridge and Iron) aboveground tank being built on-site. The author of the video is not an advertiser and is being used to show how the video ad can be of value to the reader since you have already being viewing the video.  It is hard not to think about the authors brand after viewing the video ad.  This is the benefit of Branding.

 - Ask for our Media Kit -

 

 

A Long-game that Earns Tomorrow's Sales


 Click on this Promotional Advertisement to Contact Us Today!

Good Branding Puts Your Brand or Company in the Front of a Decision-Maker’s Mind for a Purchase either Months from Now or Five-Years in the Future.

Good branding makes your brand or company the leader in a crowded field of other brands or companies vying for your potential or existing client's attention. 

An invitation to the buyer's table to negotiate potential sales from $thousands to $millions of dollars in any of these: Systems sale, Capital Equipment, Upgrades & Modifications,  Repairs, or Capital Project becomes easier now with a recognized brand that thinks forward by brand advertising.

Your advertising will cost you an unbelievable low amount, so ask for our Media Kit that has Specs and Rates. 

Below is some of our demographic data for ast-forum users will speak for itself:

Bus Sector Percent   Education Percent
Manufacturing 18%   College+ 70%
Power Gen 2%      
Chemical 4%      
Petroleum 40%      
A&E 6%      
Construction 12%      

Our network works hard for you with placements for full coverage on part of the network, or full network placement.  Brand yourself today and don’t miss-out on being invited to your client or future client's table because they forgot you.  Be the leader they will remember and be part of their capital project.  Tomorrow’s clients are your future.

 

Advertising and Marketing Agency for the ast-forum
PE Marketing, LLCBranding.jpg
Sponsors/Advertisers
Industrial Training School - Basic Electricity
 
ITS - Maintenance
 
Industrial Training School - Steel Making Tutorial
Steel Maiking Tutorial
AIS Forensic Engineering, PC
 
Confidentiality, Disclaimer & Policy
AST FORUM
© 2001 to AST (Aboveground Storage Tank) Forum, All Rights Reserved.
PE Marketing LLC is representing the steamforum for advertising and marketing
Valid XHTML 1.0 Transitional