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Earl   AST Forum  

BABRTs973 on Flash Losses

By: BABRTs973 [53] 5 Stars
Date: Thursday, July 12, 2018
Time: 7:39:56 AM

When you are talking flash losses is this upstream in 12F production storage tanks
These can be controlled using vapor recovery units, pressure relief devices such as gauge hatches and stack valves on the vent lines.
On floating roof tanks, both IFR and EFR you have the floating roof itself, a liquid mounted primary seal and on EFRs or jurisdictional regulated IFRs a secondary seal, a gauge pole sleeve in slotted gauge poles and a gasketed gauge pole well cover and gasketed gauge pole seal. In addition a gauge pole cover in conjunction with a gasketed gauge pole float may be necessary. The roof legs need either socks or covers.
In short, if there is a visible gap, greater than 1/8 inch, it needs some form of control. Look up Federal Register/Vol. 65, No. 10/Friday. January 14, 2000/rules regulations Environmental Protection Agency 40 CFR Part 60 FRL-6518-2

If you are being asked to offer suggestions I have some other information you may find useful such as the percent of emissions of roof appliances. After the rim space on floating roofs being the largest emitter, a slotted gauge pole without a sleeve, gasket and gasketed gauge pole well cover is the second largest emitter. But in offering this advice I make sure the air emissions person is very clear, I am NOT a engineer nor regardless of my experience a expert. The use or not of any emission appliance is up to the engineer and the company official, or designated inmate, who signs off on the emission calculations for the facility air permit.
Thanks to some really helpful people who have and do help me with this I am somewhat smarter than the average bear on AST emissions and encourage inspectors to get familiar with emission controls and regulations as this is going to be a good revenue source in the future.

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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

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