API MPMS 19.3D:2001 pdf download.Manual of Petroleum Measurement Standards Chapter 19.3- Evaporative Loss Measurement Part D- – -Fugitive Emission Test Method for the Measurement of Deck-Seam Loss Factors for Internal Floating-Roof Tanks.
3 Terminology
3.1 DEFINITIONS
3.1.1 Covered Floating Roof
A floating roof that results 1mm covering an external float. ing roof with a fixed roof at the top of the tank shell. This effectively converts the external floating roof to an internal floating roof, while retaining the external-type ol floating- roof design. These floating roots are typically designed in accordance with Appendix C of the API Standard 650, 11’elded Steel Tanks for Oil Storage.
3.1.2 Data Acquisition System (DAS)
The equipment used and proccss of receiving signals froni sensors. determining the values corresponding to the signals. and nxonhng the results.
3.1.3 Deck
That pail of a floating roof that provides buoyancy and structure, and which covers the majority of the liquid suthice in a bulk liquid storage tank. The deck has an annLllar space around its perimeter to allow it to rise and descend (as the tank is filled and emptied) without binding against the tank shell. This annular space is closed by a flexible device called a rim seal. The deck may also have penetrations. closed by deck fittings. that accommodate some functional or operational feature of the tank.
3.1.4 Deck Fitting
The device that substantially closes a penetration in the deck of a floating roof in a bulk liquid storage tank. Such penetrations are typically for the purpose of accommodating some functional or operational feature of the tank.
3.1.5 Deck Seam
The construction feature of a floating roof pertaining to the joint between adjacent deck sheets or deck panels. Certain types of internal floating roofs are constructed of deck sheets or deck panels that are joined by mechanical means at deck scams. Such mechanically-joined deck seams have an associated deck scam loss. Other types of internal or external floating roofs are constructed of metal shects that arc joined by welding. Such deck seams do not have an associated deck scam loss.
3.1.7 Evaporative Loss Factor
An expression used to describe the evaporative loss rate characteristics of a given floating-roof device. In order to obtain the standing storage evaporative loss rate for a bulk liquid storage tank equipped with a floating roof, the evaporative loss factor for each evaporative loss contributing device is modified by certain characteristics of both the climatic conditions and the stored liquid. The characteristics of the stored liquid are expressed as a vapor pressure function, a vapor molecular weight, and a product factor.
3.1.8 External Floating Roof
A floating roof that is exposed to ambient environmental conditions by virtue of being in a bulk liquid storage tank that does not have a fIxed roof at the top of the tank shell. External floating roofs are thus distinguished from iincrnal floating roofs, which are located in tanks that do have a fixed roof to protect the floating roof from environmental exposure. External floating roofs arc typically designed in accordance with Appendix C of the API Standard 650. Welded Steel Tanks for Oil Storage.
API MPMS 19.3D:2001 pdf download
