Area classification of the area around diesel storage tank overflow

[Mohamed]

what is the area classification of the area around diesel storage tank overflow

[Nabilia]

Hazardous Areas Technical Guide.pdf

[link Point to another website Only the registered members can access]
Hazardous Area Classifications.pdf

[link Point to another website Only the registered members can access]

[Nabilia]

Practical Electrical Equipment and Installations in Hazardous Areas - 2005.pdf

[link Point to another website Only the registered members can access]

[armanda]

thank you so much..
good sharing

[Mohamed]

Practical Electrical Equipment and Installations in Hazardous Areas - 2005.pdf

[link Point to another website Only the registered members can access]

Hazardous Areas Technical Guide.pdf

[link Point to another website Only the registered members can access]
Hazardous Area Classifications.pdf

[link Point to another website Only the registered members can access]

very thanks for your reply but the above link not contain what i main
i search API RP 500 and found that the area around flammable storage tank vent classified as class 1 division 1 but what about the area around diesel storage tank overflow

[indianindian]

thank you & its very useful.

thanks & regards.

[netspyking]

Here is link for API RP 500 ,

[link Point to another website Only the registered members can access]
If need anything , I will be glad to help

[Nabilia]

very thanks for your reply but the above link not contain what i main
i search API RP 500 and found that the area around flammable storage tank vent classified as class 1 division 1 but what about the area around diesel storage tank overflow

Obviously, the flashpoint of diesel (126 degrees F - 204 degrees F) is not of gas (-45 degrees F) but may still be considered flammable thus the classes would be the same. This would depend on your risk, proximity to other tanks (Div. 1), swing service (If the site wants to change product in the future), extreme summer temperatures.

Class I, division 2 location:
A location in which: Volatile flammable liquids or flammable gases are handled, processed, or used, but in which the liquids, vapours, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems, or in case of abnormal operation of equipment; Ignitable concentrations of gases or vapours are normally prevented by positive mechanical ventilation and might become hazardous through failure or abnormal operation of the ventilating equipment; Ignitable concentrations of gases or vapours might occasionally migrate to a class I, division 1 unless such migration is prevented by adequate positive-pressure ventilation from a source of clean air and effective safeguards against ventilation failure are provided.

A vent is a Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation, occasionally.

Determining the probability that the hazardous substance will be present is the most difficult of the three steps in classifying an area. Class I and II areas are referred to as Division 1 areas when hazardous material is anticipated during normal operations on a continuous or intermittent basis. Areas are referred to as Division 2 when hazardous material is anticipated only during abnormal operations. Additionally, in Classes I and II, areas are considered Division 1 if a process failure is likely to cause both combustible levels of hazardous material and an electrical fault in a mode which could result in an electrical arc.

The basic elements for establishing the hazardous zone types are the identification of the source of release and the determination of the grade of release. Each item of process equipment, e.g. tank, pump, pipeline, vessel, etc., should be considered as a potential source of release. Items, which contain flammable material but cannot release it to the atmosphere, e.g. all-welded pipelines, are not considered to be sources of release.
Releases are categorised as follows:

Continuous grade of release
A release which is continuous or is expected to occur for long periods. Example of continuous grade of release:
• Surface of a flammable liquid in a fixed roof tank • Surface of an open reservoir, e.g. oil/water separator

Primary grade of release
A release which can be expected during normal operation, occasionally. Example of primary grade of release:
• Seals of pumps, compressors or valves that are expected to release flammable material, particularly during start-up
• Water drainage points on vessels which contain flammable liquids • Sample points from which analytical samples are drawn • Relief valves, vents and other openings which are expected to release during normal operation

Secondary grade of release
A release which is not expected to occur in normal operation and, if it does occur, is likely to do so for short periods. Example of secondary grade of release:
• Seals of pumps, compressors or valves that are not expected to release flammable material during normal operation

[Mohamed]

Obviously, the flashpoint of diesel (126 degrees F - 204 degrees F) is not of gas (-45 degrees F) but may still be considered flammable thus the classes would be the same. This would depend on your risk, proximity to other tanks (Div. 1), swing service (If the site wants to change product in the future), extreme summer temperatures

that what i mean ,very thanks Nabilia , although diesel is combustible liquid but it may be treated as flammable in my question because of vapor released from diesel during storage

Primary grade of release
A release which can be expected during normal operation, occasionally. Example of primary grade of release:
• Seals of pumps, compressors or valves that are expected to release flammable material, particularly during start-up
• Water drainage points on vessels which contain flammable liquids • Sample points from which analytical samples are drawn • Relief valves, vents and other openings which are expected to release during normal operation

from that the area around the pumps may be consider class 1 division 1 ?

[Nabilia]

from that the area around the pumps may be consider class 1 division 1 ? Yes

[nay_den]

Thanks Bros.