Pamela Gupta <pgupta@arb.ca.gov> 

09/06/2006 06:18 PM

Please respond to pgupta@arb.ca.gov

	

To:  Michael Samulski/AA/USEPA/US@EPA

cc:  Jim Watson <jwatson@arb.ca.gov>

Subject:  Re: [Fwd: Fw: Aboveground Storage Tanks (ASTs) Field Study
Presentation]

Michael,

Please see the attached file with some charts showing the effect of
ambient

temperature on fuel surface temperature as seen in AST field study for
the various

tank sizes.  I have also included a file with couple of charts showing
the influence

of control technologies on fuel surface temperature in test tanks.

Regarding your query on the temperature data for the 350 and 1000 gallon
tanks, the

file size is too big to be sent via email, as it includes temperature
data for each

minute over a period of 2-3 months.  If you want I can send you the max,
min and

average ambient and fuel temperature data for each day.  The emissions
(g/gal/day)

were calculated using AP-42 methodology which used the actual fuel
surface

temperatures for control and test tanks.  Ambient temperature data was
not used in

these calculations.

Emissions data shown on slide 14 are the average emissions calculated
over 2-months

(September 1-October 26) for 350gal AST and 3-months (July 26-Oct. 26)
for 1000 gal

AST.

Please let me know if you need more information.

Pamela Gupta

916-324-4458

Jim Watson wrote:

> Pamela:

>

> Can you provide Mike with the additional information he has requested?

>

> Thanks

>

>  
------------------------------------------------------------------------

>

> Subject: Fw: Aboveground Storage Tanks (ASTs) Field Study Presentation

> Date: Wed, 30 Aug 2006 14:16:11 -0400

> From: Samulski.Michael@epamail.epa.gov

> To: jwatson@arb.ca.gov

>

> Jim,

>

> Thanks to Pamela for sending the presentation on ASTs.

>

> When we spoke about the ASTs, you mentioned that you were seeing the

> same fuel heating and cooling cycles (relative to ambient) for small
and

> large tanks.  Do you have a report that shows these temperature
traces?

>

> I saw that slide 14 showed similar g/gal for the 350 and 1000 gal
tank,

> but it was over different time periods.  Do you have the fuel
tempeature

> and ambient temperature traces for this testing?

>

> Thanks,

>

> Mike.

>

> ----- Forwarded by Michael Samulski/AA/USEPA/US on 08/30/2006 02:13 PM

> -----

>

>              Pamela Gupta

>              <pgupta@arb.ca.g

>              ov>                                                    
To

>                                       Michael Samulski/AA/USEPA/US@EPA

>              08/29/2006 06:26                                       
cc

>              PM                       Jim Watson <jwatson@arb.ca.gov>,

>                                       Manjit Ahuja <mahuja@arb.ca.gov>

>                                                                
Subject

>               Please respond          RE: Aboveground Storage Tanks

>                     to                (ASTs) Field Study Presentation

>              pgupta@arb.ca.go

>                     v

>

>

>

>

>

> Michael,

>

> Attached is the ".pdf" document with the latest presentation on

> Aboveground Storage Tanks (ASTs) field study.  This study was
conducted

> to evaluate different control technologies that can be used to control

> standing or storage losses.

>

> Please let me know if you have any questions.

>

> Pamela Gupta

> 916-324-4458

> [attachment "Microsoft PowerPoint - AST Presentation to EPA Aug 2006

> Final.pdf" deleted by Michael Samulski/AA/USEPA/US] [attachment

> "pgupta.vcf" deleted by Michael Samulski/AA/USEPA/US]

>

>  
------------------------------------------------------------------------

>

>   James Watson <jwatson@arb.ca.gov>

>   Manager, Engineering Development and Testing Section

>   Air Resources Board

>   Monitoring and Laboratory Division

>

>   James Watson

>   Manager, Engineering Development and Testing Section 
<jwatson@arb.ca.gov>

>   Air Resources Board

>   Monitoring and Laboratory Division

>   1900 14th St.                                         Work: (916)
327-1282

>   Sacramento                                            Fax: (916)
322-2444

>   California                                            Cellular:
(916) 717-9211

>   95814

>   USA

>   Additional Information:

>   Last Name     Watson

>   First Name    James

>   Version       2.1



Effect of Ambient Temperature on Fuel Surface Temperature in 

Aboveground Storage Tanks 

The 2005 summer-time field study was conducted on Aboveground Storage
Tanks (ASTs) to evaluate the effectiveness of different control
technologies.  Two identical sets of common sizes (350, 550 and 1000
gallon) ASTs were tested.  Each size category included a control tank
(open system with no controls) and a test tank (with controls). 
Thermocouples were used to measure the daily fuel surface temperatures
and ambient temperatures.  Each tank configuration was equipped with its
own thermocouple.  Data Loggers were used to download all the
temperature data from the respective thermocouples.  

The field study data indicated that the fuel surface temperature profile
in an uncontrolled AST follows very closely with the ambient temperature
profile.  Following are the series of charts showing the profile of
ambient temperature vs. fuel surface temperature in uncontrolled ASTs:

350 Gallon Fuel Temp vs. Ambient Temp

550 Gallon Fuel Temp vs. Ambient Temp

1000 Gallon Fuel Temp vs. Ambient Temp

Comparison of Fuel Surface Temperatures in

Test Tank (with control technologies) vs. Control Tank (with no
controls)

The fuel surface temperature in the test tanks, retrofitted with
different control technologies, was attenuated to different extents
depending on the type of control technology used.  For example, control
technology combinations of Paint+Shade reduced the fuel surface
temperature in test tank, resulting in approximately 40% emission
reductions.  Foam insulation was the most effective control technology
in reducing the fuel surface temperature, resulting in approximately 90%
emission reductions.  The U.S. EPA approved AP-42 methodology was used
to calculate the emissions using the temperature data collected in the
field study.

Following are the charts showing the profile of ambient temperature vs.
fuel surface temperature in control AST (with no controls) and test AST
retrofitted with various control technologies as tested in the field
study:

550 Gallon Test Tank with *PV+Paint+Shade

*PV valve controls emissions from escaping out of the tank and does not
affect the fuel surface temperature.

350 Gallon Test Tank with *PV+Insulation

*PV valve controls emissions from escaping out of the tank and does not
affect the fuel surface temperature.

