Double Block & Bleed Saver

4 Reviews
8 Followers
9 Deploys

Safe working behind leaking valves by installing a vacuum lock

Page last modified
February 22 2024

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:

  1. Both block valves in a classical DB&B configuration, or
  2. Both seats in the body of a single valve, e.g. most ball, plug or gate valves, or
  3. 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.

Case Study Valvetight

 

Pros & Limitations
1
Maximum safety for workers, whilst being able to prevent boundary isolation increase and prevent shut downs
1
Maximizing plant availability - no risk of delays due to leaking valves
1
No grease or sealants, no risk on sudden gas blow-through
1
No grease or sealant necessary, means no collection of dirt, no sealant in the pipeline and the valve stays fit for purpose afterwards
1
Certified and fully suitable for hydrogen applications
1
No dependency on last line of defense PPE
1
Significant cost reduction
0
Heavy leaking valves might be left unrepaired
Specification
Specification Title Specification Description
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

Reviews (4)

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Technology Readiness Level

[9/9]

Development Technology demonstration Mature / Proven
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Founded in 2014, Valvetight offers an unique solution to a widespread problem of passing valves. Instead of repairing valves or greasing them, Valvetight supplies a tool that creates a vacuum lock preventing a flow of medium to the safe working area. Valvetight offers the full range of services from tool-only to full operational support.  

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