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Earl   AST Forum  

AST Painting Requirements

Tuesday, March 01, 2005   By: No Rust
Where can I find out which states require aboveground petroleum storage tanks (API 650) to be painted? I have heard that NY, NJ, PA and NC require AST's to be painted white. I assume this is to help reduce emissions. I am having difficulty finding any references for state regulations that specifically state that AST's must be painted. Any help would be greatly appreciated.

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Thursday, March 03, 2005   By: MJCronin
I believe that your question should be about painting the tank and the physical nature (specifically the vapor pressure) of the liquid stored.....Aside from common-sense corrosion protection, there probably are no state/federal/local requirements about painting and coating water storage tanks..........Whereas, for atmospheric storage tanks of liquids with a high vapor pressure ( like gasoline) a high reflectivity paint both saves money and reduces emissions..............Chemical companies and paint consulting firms, I suspect, may have internal guidleines on just which liquids require special reflective paints.......I also understand, that for large gasoline tanks, it is common practice to locate the tanks so that one "shades" the other as the sun tracks across the sky. This too cuts emissions and reduces losses............For liquids with even higher vapor pressure, where losses become extreme, it is common practice to store in an ASME VIII/API-620 tank with a nitrogen pad...........What these vapor pressure limits are, I don't know......Anybody else out there have some website reference to share ?...................My opinion only.................... MJC

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Friday, March 04, 2005   By: Stephen H
Actually, there are requirements for water tanks- not for solar heat gain, but just general maintenance. Texas, for example, requires tanks be maintained to AWWA standards, which includes the painting. But the original question was on petroleum tanks.

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Wednesday, March 02, 2005   By: Stephen H
I've not heard of this requirement, but a google search turns up enough information to show that it is at least a consideration. For example: http://www.arb.ca.gov/vapor/above/aststdspec110201.pdf

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Wednesday, March 02, 2005   By: Lawrence
There is no state that has regulations specifing paint let alone a specific color. L.

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Thursday, March 03, 2005   By: Steve Braune, Tank Industry Consultants
Lawrence, I recall that NC may have such a requirement. I've heard of other states addressing it too. I haven't done any research, but am recalling presentations at several AST seminars from early-mid 1990s. The color was an emissions issue. I have always wondered about those dark green Hess tanks.

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Tuesday, April 26, 2005   By: gmorovich@temcor.com
Steve, You are correct about some states having rules on the color and on external coating maintenance. Also in all US states and much of Europe the color of the tank and coating condition are considered emission factors. The US EPA adopts these factors from the API Manual of Petroleum Measurement Standards (latest solar absorptance factors under Chapter 19.1, Table 5). This table lists the best rating for aluminum (as a material), with next on the list being steel painted white and lower on the list is steel painted aluminum color.

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Wednesday, March 02, 2005   By: MJCronin
Well,.....not painting a steel tank is kind of like "saving money" by not putting any oil in your car.........nobody makes you do it........will it save you money in the long run ????......Are you buying a tank in order to "flip it" somehow in a housing market or something ????? ......MJC

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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

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