Double block and bleed definition

Double block and bleed means the closure of a line, duct, or pipe by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves.
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Double block and bleed means the closure of adjacent piping by locking out a drain or vent in the open position in the line between 2 locked out valves in the closed position;
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Double block and bleed means the closure of a line, duct or pipe by locking and tagging a drain or vent which is open to the atmosphere in the line between two locked-closed valves.
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Examples of Double block and bleed in a sentence

  • Double block and bleed system means two block valves connected in series with a bleed valve or line that can vent the line between the two block valves.

  • Double block and bleed valves are required for relief valves that would require an entire plant outage to service.

  • Double block and bleed isolating valves in the cargo piping system allow for simultaneous loading or discharging of different grades.

  • Blinding should take place at the flange closest to the confined space.• Removing a valve, spool piece or expansion joint as close as possible to the permit space and placing a blank or cap on the open ends.• Double block and bleed by shutting a least two valves in piping leading to the permit space, opening a bleed off path to atmosphere between the shut valves, and/or locking/tagging these valves.

  • The system shall be designed so that pigging can be used for internal cleaning of the pipework.ABOVE GROUND PIPING SYSTEMS7.1 Isolation FacilitiesA risk assessment should be undertaken to determine the design of isolation, E.G. Double block and bleed, single block and bleed, etc.Isolation valves should be installed for shut down and maintenance of sections and plant items shall be identified at design stage.

  • Double block and bleed valves shall be provided upstream and downstream of each meter run to allow switching from one run to another without compromising measurement performance and to ensure no gas bypasses the intended meter runs.

  • Double block and bleed valves ensure that there is no possibility of gas entering the engine room when the system is shut down.All the gas processing equipment up to the Slam shut valve is located within the cold box and therefore the possibility of mechanical damage is unlikely.

  • This form of isolation should only be used when it can be assured that the pressure will not exceed atmospheric.• Double block and bleed is an acceptable method of isolation, however, it is recommended that more positive forms of isolation be used whenever possible.

  • Double block and bleed isolation is provided by two sealing surfaces that, in the closed position, provides a seal against pressure from both sides and a bleed (drain /vent) valve of the cavity between them.

  • Double block and bleed should only be used on hydrocarbon systems after considering the following:• special safety considerations• the system is critical for the overall regularity• the equipment is maintained when the rest of the process system is in operationBased on regularity, typical locations for double block and bleed are:• pig launchers and receivers• process compressors• crude oil export pumps Illustrations of different isolation arrangements are given in Annex A Figure A.1 and A.2.


More Definitions of Double block and bleed

Double block and bleed means the closure of a line, duct, or pipe by closing and locking or tagging two in-line valves and by opening and
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Double block and bleed means the closure of a line, duct, or pipe by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves. "Emergency" means any occurrence (including any failure of hazard control or monitoring equipment) or event
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Related to Double block and bleed

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