Double Block & Bleed Saver
Safe working behind leaking valves by installing a vacuum lock
Page last modified
Monday, January 4, 2021 - 12:23
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
Maximizing plant availability - no risk of delays due to leaking valves
No greasing, no risk on sudden gas blow-through
No sealant necessary, the valve stays fit for purpose afterwards
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 | On- & Offshore
ATEX certified
ATEX II 2G Ex h IIB+H2 T4 Gb certification available (zone 1 environment).
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
Compliance
International guidelines on request: eg. IECEx.
Input
Compressed air or nitrogen.
Pipe diameter
No limit
Power
Both 110V/60Hz and 230V/50Hz
Pressure class
No limit
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continueReviews (4)
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Barbara Schildknegt
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Barbara Schildknegt
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Barbara Schildknegt
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