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Double Block & Bleed Saver
Safe working behind leaking valves by installing a vacuum lock
Page last modified
September 20 2023
The working principle of the DBB-SAVER is based on active evacuation of the bleed volume, thereby creating a vacuum lock between two sealing surfaces, preventing leakage towards the safe work area.
The DBB Saver can be deployed on systems containing hazardous media such as:
- Gasses, e.g. flammable and/or toxic, like natural gas, H2S, hydrogen, etc.
- Liquids becoming gaseous under atmospheric conditions, e.g. LNG, LPG, etc.
- Regular liquids like crude oil, naphta, etc.
The bleed volume can either be the section between:
- Both block valves in a classical DB&B configuration, or
- Both seats in the body of a single valve, e.g. most ball, plug or gate valves, or
- Any other combination of two valves in series, e.g. a block valve and (under conditions) a control valve without traditional isolation credits
The vacuum creates a negative pressure difference towards the safe work area and reverses the flow direction over the second barrier. The guaranteed continuous presence of the vacuum in the bleed section makes leakage to the safe working area physically impossible.
Pro/con
Maximum safety for workers, whilst being able to prevent boundary isolation increase and prevent shut downs
Maximizing plant availability - no risk of delays due to leaking valves
No grease or sealants, no risk on sudden gas blow-through
No grease or sealant necessary, means no collection of dirt, no sealant in the pipeline and the valve stays fit for purpose afterwards
Certified and fully suitable for hydrogen applications
No dependency on last line of defense PPE
Significant cost reduction
Heavy leaking valves might be left unrepaired
Specification
Areas of Application
Gasses | Liquified Gasses | Liquids | Hydrogen | On- & Offshore
ATEX certified
IECEx / ATEX II 2G Ex h IIB+H2 T4 Gb certification available (zone 1 environment). For North America Class 1 Div 1 available
Capabilities
Fully automated design | Fail safe functionality | Local visual and audible alarm | Remote wireless online alarm functionality
Capacity
Capacity rated to customers request.
Certifications / licences
PED | EMC | CE | ATEX | IECEx | HAZLOC Class 1 Div 1 | ASME VIII | B31.3
Compliance
International guidelines on request (e.g. Brazil, China, etc.)
Input
Compressed air or nitrogen.
Pipe diameter
No limitation to pipeline diameter of systems service by DBB-SAVER
Power
Both 110V/60Hz and 230V/50Hz
Pressure class
No limitations on pressure class of systems serviced by DBB-SAVER
Relative Business Impact
Reviews (4)
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Technology Readiness Level
[9/9]
Development
Technology demonstration
Mature / Proven
Technologies Deployed By
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