| 词条 | Fixed roof tank |
| 释义 |
A fixed roof tank is a type of storage tank, used to store liquids, consisting of a cone- or dome-shaped roof that is permanently affixed to a cylindrical shell. Newer storage tanks are typically fully welded and designed to be both liquid- and vapor-tight. Older tanks, however, are often riveted or bolted, and are not vapor tight. A breather valve (pressure-vacuum valve), commonly installed on many fixed roof tanks, allows the tank to operate at a slight internal pressure or vacuum. This valve prevents the release of vapors during very small changes in temperature, barometric pressure, or liquid level.[1] Fixed roof tanks without breather valves will generally be freely vented;[2] thus the emissions from a fixed roof tank can be non-trivial. Gauge hatches, sample wells, float gauges, and roof manholes provide accessibility to these tanks, and also act as potential sources of volatile emissions.[3][4] ApplicationsStorage tanks in general, and fixed roof tanks in particular, containing organic liquids can be found in many industries, including:
Fixed roof tanks are typically used with products that have relatively low volatilities and flash points.[5] Using a fixed roof tank to store a product with high volatility can lead to product losses as vapors escape the enclosure.[6] See also
References1. ^{{cite web|last1=BNH Gas Tanks|title=Fixed Roof Tank|url=http://www.fixedrooftank.com/|accessdate=5 December 2015}} 2. ^1 {{cite web|last1=South Coast Air Quality Management District|title=Supplemental Instructions For Liquid Organic Storage Tanks|url=http://www.aqmd.gov/docs/default-source/planning/annual-emission-reporting/supplemental-instructions-for-liquid-organic-storage-tanks.pdf?sfvrsn=2|accessdate=5 December 2015}} 3. ^{{cite web|last1=Werner Sölken|title=Explore the World of Piping - Introduction to Storage Tanks|url=http://www.wermac.org/equipment/storage_tanks_vessels_general.html|accessdate=5 December 2015}} 4. ^{{cite web|last1=USA Environmental Protection Agency|title=Alternative Control Techniques Document:Volatile Organic Liquid Storage in Floating and Fixed Roof Tanks|url=http://www3.epa.gov/ozonepollution/SIPToolkit/ctg_act/199401_voc_epa453_r-94-001_liquid_storage_roof_tanks.pdf|accessdate=5 December 2015}} 5. ^{{cite web|last1=Buckeye Fire Equipment|title=Storage Tanks: Fixed or Semi-fixed Systems|url=http://buckeyefire.com/pdfs/foampdfs/storage/fixed.pdf|accessdate=5 December 2015}} 6. ^{{cite web|last1=ISEC Company|title=Fixed Roof Tank|url=https://www.youtube.com/watch?v=a_3kOcjLBu4}} 1 : Storage tanks |
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