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  

IFR Deck Drain

Tuesday, October 03, 2017   By: Kumaran [1861] 1 Stars
As per aluminium IFR design the supplier providing deck drain pipe 12 mm dia ID pipe of 300 mm long. around 150 mm dip into product. my question is there any vapour expose is possible during tank operation through this deck drain pipe.

Post a Reply...
Viewed 670 times

Tuesday, October 03, 2017   By: Dunedin [37] 4 Stars
Yes very much so! In fact there will be a number of drains on an IFR and each one has the potential to allow hydrocarbon vapour to pass into atmosphere. However some manufacturers do supply a sealed drain which is normaly closed and only opens when product needs to drain from the IFR - I would recommend going for something like that.

Post a Reply...
Viewed 653 times

Tuesday, October 03, 2017   By: DavidR@Fst.net [39] 5 Stars
I think the US EPA number is 7.9 pound-moles per year per drain. Unless the drain is sealed, it will still leak vapors at the same rate. Vapors are small and any small opening is enough for them all to get out. Even an overlapped and bolted deck seam leaks vapors, and drain seals are no where near as tight. I have yet to see a drain seal that can stop vapors in a meaningful manner and still function as a drain especially when there is a small amount of liquid on top. I have never seen testing that supports the contention that anything short of a screwed plug can stop vapors from drains. Yes, a drain plug, ball or cover will reduce any wind effect but an internal floating roof experiences zero wind speed anyway, so where is the benefit? In order to reduce emissions, some would advocate fewer drains but how do you make sure they are where the liquid will be? Putting a screwed plug means you dont have drains. If I saw a 140 foot cover with four drains with screwed plugs, I would call this a flagrant example of not meeting the intent of the standard and certainly not justifying designing to only 5 psf. The only solution is to not have drains. Only one aluminum IFR that I know of does this and they design for the higher live load 12.5 psf.

If you need drains because the deck is designed for only 5 psf then I think you need enough drains to protect the entire cover and they have to be fully functional, and I have yet to see a drain cover that seals and drains.

My opinion only !

Post a Reply...
Viewed 654 times

Wednesday, October 04, 2017   By: BABRTs973 [53] 5 Stars
When you say expose do you mean explosive atmosphere?
The drains are liquid mounted, meaning the dip tubes are or should be submerged in liquid to minimize the vapor loss. With circulation in the tank it would be hard to accumulate enough gas on top of the roof for any ignition or explosion. And a ignition source would be needed.
If this was a issue, IFRs would be blowing up and burning all over the world.

Post a Reply...
Viewed 610 times

Thursday, October 05, 2017   By: Dunedin [37] 4 Stars
Key words in above statement should be However as you well know accidents happen when the unusual happens! 1 IFR do not always travel horizontally 2 when IFR is landed on the legs and not floating are just two examples of a circumstance where vapour could build up under the IFR and be released through the drains..

Post a Reply...
Viewed 612 times

Published on ast-forum.com


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

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
Industrial Training School - Basic Electricity
ITS - Maintenance
Industrial Training School - Steel Making Tutorial
Steel Maiking Tutorial
Industrial Training School - Instrumentation
5% Off Enter TV0901
Confidentiality, Disclaimer & Policy
© 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