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BABRTs 973 on Vapor Emissions

By: BABRTs 973 [53] 5 Stars
Date: Tuesday, May 01, 2018
Time: 8:40:05 AM

Unless you are a environmental engineer or something of that ilk or are the designated inmate, you really need to go out and have this done for you. There are companies who will take you tanks and based on product, gravity, TRVP, H2S roof vapor prevention appurtenances, location, tank setting cleaning and other things I am just beginning to find out will determine your pounds per year the tank emits.
This is then judged against the operating permit which in Texas is PBR and then Title V. I am presently working for a company who due to permit expiration will fall into Title V. I am having to inventory all the owned tanks in the area for roof accessories on the roof which will allow emissions. These are primary and secondary seals slotted gauge poles roof legs gauge wells hatches gauge hatches ladder boxes on IFRs seals there is a whole list of items that are taken into consideration.
What is interesting after primary and secondary seals the highest emitter is the gauge pole. And a simple gauge pole sleeve fitted around the gauge pole and liquid mounted eliminates at huge percentage of emissions. The floats everyone sells is only a marginal improvement. And these floats are a operational nightmare. The gauge pole covers offer some improvement but you need to run the modeling with and without the cover before spending the money for these. We found the gauge pole sleeves themselves lowered the numbers to a point where the covers were not necessary.
HMT has a EnviroSleeve that is probable one of the best alternatives to the cover and includes the gauge pole sleeve. But they build these in the Netherlands and has a long lead time. It is quite disappointing them having this, promoting it then finding out how ling it takes to get them.
If you will be attending ILTA and need a excuse to go Rob Ferry will be presenting there. This guy KNOWS tanks and tank emissions. I would highly recommend his classes or one of his seminars as he will lead you down the right path.

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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

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