Landing_loss

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Instructions

2. Dark blue cells on the template contain instructions for entering episode data.

3. Enter the requested data into the light blue cells.

5. The last worksheet in this workbook provides references for chemical and physical property

!. "uestions# $ontact Danielle %esvacil at &5'2( 23)*2'+2 or by e*mail at D%esvaci,tceq.st

Landing Loss Emissions

Introduction

Floating-Roof Tank Designs

internal floating*roof tanks &/01Ts( with a full or partial liquid heel

e-ternal floating*roof tanks &E01Ts( with a full or partial liquid heel and

/01Ts and E01Ts that drain dry.

This workbook provides a template for reporting landing loss sample calculation

landing loss emissions. lease use the template in conunction with the det

'. 0or each landing loss episode use one template worksheet to report the associated sampleyou prefer but please format workbooks logically according to tank number time period etc.

. Data entry cells may contain formatting checks to ensure valid data is reported. /f data with ito correct the format.

6anding losses occur from floating*roof tanks whenever the tank is drained to a level where its roof land4hen a floating roof lands on its supports or legs it creates a vapor space underneath the roof. 6iquidto replace those e-pelled by breathing &in the case of internal floating roof tanks( or wind action &in theas standing idle losses occur daily as long as the tank roof remains landed.

7dditional emissions occur when incoming stock liquid fills a tank with a landed roof8 the incoming liquidgenerates its own set of vapors that are displaced during the filling process. These two types of emissi

0or a given roof landing event total landing loss emissions are therefore the sum of the filling losses anlanded. 6anding losses are inherently episodic in nature and must be determined each time a tank9s fl

$urrently no storage tank emissions software including E79s T7%:; program determines landing losemissions may be determined using the guidance outlined in 7merican etroleum /nstitute &7/( Techni6andings &hereafter referred to as 7/ T1 25!=(.

Tank design considerations will impact both standing idle and filling loss emissions. Therefore 7/ T1emissions determination purposes>


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tanks that drain to a sump that retains a liquid heel

tanks whose sumps have baffles or similar fittings that retain liquid or

flat*bottom tanks whose contents have been removed by a vacuum truck since liq

Required Data for Landing Loss Emissions Determinations

7fter you have correctly determined your tank type you must collect the following information about the

tank diameter

tank color

height of the vapor space under the floating roof height of the stock liquid

atmospheric pressure at the tank9s location

average temperature of the vapor and liquid below the floating roof

physical and chemical properties of the stored liquid &such as density molecular w

physical and chemical properties of the liquid that the tank is refilled with if differen

number of days that the tank stands idle while its floating roof is landed

Reporting Landing Loss Emissions within the Emissions Inventory

http>??www.tceq.state.t-.us?comm@e-ec?forms@pubs?pubs?rg?rg*3!+@+5?inde-.html

u!mitting Landing Loss ample "alculations

7/ T1 25!= presents standing idle and filling loss equations for each different tank category listed abotank in question into one of the above categories. $are must be taken when classifying a tank as drainliquid has been removed. The following tank configurations qualify as tanks with a partial liquid heel

0or each tank category listed above 7/ presents different saturation factors that have been validated tfactors represent the stratification of vapors in the vapor space underneath the floating roof8 therefore

upon tank shell height is necessary.

0or a given tank you can then use this information in conunction with the appropriate standing idle andepisode. The annual landing loss emissions can then be determined by summing the emissions from e

each roof landing episode must be individually determined using accurate temperature data and stored

7void using certain default parameters presented within 7/ T1 25!= that may not accurately reflect avapor temperature range specified within the document is 2+ degrees 1ankine8 however this default vapainted other colors the daily vapor temperature range must be calculated from the appropriate equatitemperature range to increase.

1eport landing losses for each storage tank on the appropriate path within the emissions inventory queoccurred due to normal routine operation revise annual and oAone season emissions accordingly. 0or

$hapter of 2++5 Emissions /nventory Buidelines. This document is available on the T$E"9s website

er 3+ T7$ ;ection '+'.'+&c( representative sample calculations are required to be submitted with theepisode e-perienced at your site submit the following information with your E/" revisions>


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tank 0/%

tank E%

7/ category &as outlined in the C0loating*1oof Tank DesignsC section above(8

the dates when each landing loss episode occurred and

#uestions

7ny questions about the use of 7/ T1 25!= equations may be directed to Danielle %esvacil at &5'2( 2

all of the information listed under the C1equired Data for 6anding 6oss Emissions Determinat

To facilitate the submission of this information you may use the C6anding loss episode templateC workslanding loss episode.


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ata for organic liquids if needed.

te.t-.us.

ata to the T$E". This workbook does NOT calculate

iled guidance provided below.

calculation data. 4orkbooks may contain as many episode worksheets as

valid formatting are entered the error message will provide instructions

s on its deck legs or other supports &including roof suspension cables(.remaining in the bottom of the tank provides a continuous source of vaporsase of e-ternal floating roof tanks(. These emissions referred to

not only displaces those vapors remaining under the floating roof but alsons are collectively referred to as filling losses.

d the daily standing idle losses over the entire period that the roof remainedoating roof is landed.

s emissions as part of routine program operation.


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id typically will still remain in irregular surfaces along the tank bottom.

tank and its contents for each episode when the roof is landed>

ight and vapor pressure(

t from the previously stored liquid

e. To accurately use these equations you must first classify the storagedry8 7/ states that a tank is only a drain*dry tank if all of its free*standing

according to 7/>

hrough field studies to use in the landing loss equations. These saturationno modification to these saturation factors based

filling loss equations to determine the emissions for each roof landingach episode occurring within a given calendar year. Emissions from

liquid properties for the time of year when the roof landing occurred.

iven storage tank. 0or e-ample the default dailylue is only appropriate for storage tanks that are painted white. 0or storage tanksn presented within the document since solar insolation will cause the daily vapor

tionnaire &E/"(. /f your site determines that landing loss emissionsspecific procedural guidance on reporting emissions on the E/" please consult

at>

se calendar year 2++2 2++3 and 2++ E/" revisions. 0or each landing loss


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)*2'+2 or by e*mail at dnesvaci,tceq.state.t-.us.

ionsC section above.

eet contained in this workbook to provide the requested data for each


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Landing loss episode data

$lease enter the following information%

1egulated entity reference number &1%(>

7ir account number>

Tank 0/% in the annual emissions inventory>

Tank E% in the annual emissions inventory>

Tank category>

Tank shell color>

Date&s( this episode occurred>

$lease enter the following parameters for t

$arameter description and sym!ol

tank diameter D

For this landing loss episode& please enter

tored liquid's name%

%umber of days the tank stands idle while floatingroof is landed n

d

7verage temperature of vapor and liquid below floating roof T

a

7tmospheric pressure at tank location a


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$roperties%

constant from 7ntoine9s equation

true vapor pressure of stored liquid

Refilling liquid's name%

$roperties%

constant from 7ntoine9s equation

true vapor pressure of stored liquid

Tank "ategory

drain*dry tank &/01 or E01(

stock liquid density 4l

stock vapor molecular weight v

For this landing loss episode& if the liquid tplease enter the following properties for th

stock liquid density 4l

stock vapor molecular weight v

internal floating roof with full liquid heel

internal floating roof with partial liquid heel

e-ternal floating roof with full liquid heel

e-ternal floating roof with partial liquid heel

Stored liquid properties

Relling liquid properties


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1%+'235!=F

is episode%

)alue *nits "onstraints%

'! dimensionless '

)+ G 0ahrenheit +

'.= psia ).3!

! feet +

'5+ feet + HD

3 feet +

the stored liquid's name and physical properties(

HndH

HTaH

HaH

Hhv

Hhle

external floating roof with full liquid heel


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$roperty units% )alue%

lb?gallon

lb?lb*mole

psia

$roperty units% )alue%

lb?gallon

lb?lb*mole

psia

degrees 1ankine8 vapor pressureequation in units of psia and degrees1ankine

hat the tank is refilled with is different than the previously stored liqurefilling liquid(

degrees 1ankine8 vapor pressureequation in units of psia and degrees1ankine


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3!!

''+

'5.='=


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id&


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References for physical+chemical data%

Ither references include>

$ T7%:; .+)d chemical database. 0ree and available by downloading the T7%:; .+

http>??www.epa.gov?ttn?chief?software?tanks?inde-.html

$

:arel Jerschueren. &%ew Kork > Jan %ostrand 1einhold $o.( ')F3

2++' edition available at T$E" 6ibrary 5= J!'< 2++' J.'

$

2+++ edition available at T$E" library !!+.+2 =5 2+++

$

$

T$E" 6ibrary !!+.+2 K2$ ')))

$

$

$

$ 7ntoine9s coefficients are also in the %/;T $hemistry workbook which is avail

$

$ http>??www.eng.umd.edu?Lnsw?ench25+?antoine.dat

Two widely available resources are the $1$


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d software program from the E79s website>

able online at> http>??webbook.nist.gov?chemistry?

hemical Engineering


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cBraw

Landing_loss

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