Jun,27

API TR 2576-2016 pdf download

API TR 2576-2016 pdf download

API TR 2576-2016 pdf download.Short-term Evaporative Loss Estimation from Atmospheric Storage Tanks.
1 Scope This Technical Report provides methodology on how to estimate short-term individual tank and facility-wide emissions. The methodology is intended to generate reasonable worst-case short-term emission estimates, and not necessarily an estimate of actual short-term emissions (see Annex A for limitations on applying this methodology to actual scenarios). The methodology is applicable to routine tank operations and not applicable to emissions associated with maintenance activities or tank roof landings. The methodology is applicable for estimating short-term emissions from tanks with fittings and seals in good condition and not applicable for tanks with damaged seals or roof fittings. Also, this methodology is not intended for situations where a tank has a malfunction, the emission controls are not working as intended, or there is other structural damage. The calculated mass emissions using this methodology can be used as input for short-term air dispersion modeling. The Technical Report does not provide guidance on applicability of any particular air dispersion models or modeling protocol. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. API Manual of Petroleum Measurement Standards (MPMS) Chapter 19.1, Evaporative Loss from Fixed-Roof Tanks, 4th Edition, 2012. API MPMS Chapter 19.2, Evaporative Loss from Floating-Roof Tanks, 3rd Edition, 2012. API MPMS Chapter 19.4, Evaporative Loss Reference Information and Speciation Methodology, 3rd Edition, 2012. 3 Estimating Reasonable Worst-case Short-term Emissions from an Individual Storage Tank NOTE While units from these calculations are typically in pounds/year from the referenced API MPMS Ch. 19.1 and 19.2 standards, the short-term emissions durations are usually calculated on the order of hours to days.
.2 Product Storage The chemical properties of the product stored in the tanks are the primary parameters used to estimate emissions from a tank. For tanks that can store multiple products throughout the year, emissions should be calculated for each product. In some states, it is accepted practice to use the highest-emitting product or hazardous air pollutant (HAP) combined with a Protective Action Criteria (PAC) 3 threshold or Effects Screening Level (ESL) 4 to be representative of worst-case hourly emissions. As an example, for the same tank configuration, same throughput, same location, and same season, gasoline with a Reid Vapor Pressure (RVP) of 12 psi will most often represent a worst case relative to gasoline stored with an RVP of 9 psi, assuming HAP contents are the same. If for the same scenario the HAP content of the RVP 9 psi gasoline were significantly higher than the RVP 12 psi gasoline, then the RVP 9 psi gasoline may be a worst case based on a particular HAP or chemical properties. Chemical parameters obtained from actual product measurements are preferred over more generic properties representing a broadly defined class of products.
3.3 Fixed-roof Tanks (Vented to Atmosphere, No Floating Roof) The maximum short-term emission rate, L MAX , is to be determined using the working loss, L W , which is calculated with the throughput based on the maximum filling rate and with the turnover (saturation) factor, K N , set equal to 1. The liquid surface temperature is to be set using the liquid surface temperature equation in 3.1. An annual working loss, L W , can then be determined from API MPMS Ch. 19.1 equations. If the tank stores different stocks during the course of a year, then each stock should be evaluated separately. Given that the working loss would typically be the dominant mechanism driving short-term emission rates for fixed-roof tanks, the calculation of short-term emission rates for typically controlled fixed-roof tanks without vapor recovery may be based on only the working loss. (i.e. the standing loss may be neglected).

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