ADVERTISEMENT FEATURE COVER STORY
IMPROVING H&S STANDARDS with double block & bleed isolation
This month’s cover story looks at the versatility of ZETRIX V
arious industries all over the UK and Ireland are benefiting from the added
safety and efficiency that the ZETRIX valve can provide. With the advantages of a metallic sealing process valve combined with a butterfly design, these valves can be used for isolation and control. Boasting zero leakage and emissions, the triple offset principle guarantees a permanently tight seal, conforming to leakage rate A as per DIN EN 12266-1 standards, because the valve fits precisely and closes without friction. Setting the ZETRIX up as a double block
and bleed isolation offers many benefits including improved Health & Safety standards, reduced downtime for maintenance repairs and considerable savings when it comes to energy and cost. This double isolation model has been developed to meet the increasing demands of Health & Safety requirements where the traditional single isolation of plant is inadequate. HSE guidance suggests that double block and bleed is the only proved isolation in accordance with HSE Guidance 253 (Safe Isolation of Plant and Equipment) which states that double block and bleed is greatest in the hierarchy of mechanical security for isolation methods.
EASIER & SAFER MAINTENANCE Using this method of double block and bleed isolation means a section of plant can be isolated without having to shut down an entire system, as would need to be done with single isolation valves in place, therefore allowing for easier and safer upgrade or maintenance work. The small face-to-face dimensions of
the ZETRIX provides even more versatility in that should one wish to change from single isolation to double isolation with bleed, only small changes to pipe work are required. A typical double block and bleed, which incorporates two ZETRIX, is the equivalent face-to-face dimension to the vast majority of single isolation valves (typically gate and parallel slide valves). Therefore, the ZETRIX can be used for modifying pipe work with single isolation to double block and bleed in order to meet Health & Safety guidance with very little alteration to the pipe work, ultimately saving time and money (plant
10 FEBRUARY 2019 | PROCESS & CONTROL
downtime and labour costs are dramatically reduced). There are major benefits to using double isolation in the space of one valve as very little space is required, it reduces the possibility of leak paths and is a lot safer than relying on the integrity of a single isolation valve. With the ability to make the spool piece
to fit any gap, the system can be tailored to specific installation restrictions. Currently, other ranges on the market
Setting the ZETRIX up as a double block and bleed isolation offers improved health & safety, reduced downtime for maintenance repairs, and energy savings (above)
With its quick closing action, the ZETRIX (left and below) can be used as an Emergency Shutdown Device
seem to have a costly, limited choice in comparison to the comprehensive range of pressure classes, materials and sizes available with the ZETRIX range from ARI-Armaturen. This solution can also be supplied with all forms of actuation including electric and pneumatic, if required.
ADDED FLEXIBILITY Durable and reliable with high performance, the ZETRIX valve range has impressed the market for some time now and new types, sizes and pressure ratings now add even more to the flexibility of this range. A version with butt weld ends is now available, in addition to the double flanged and fully lugged designs. With its impressively quick closing
action, the valve can also be used as an Emergency Shutdown Device, providing the ultimate in tightness and safety. It is essential that a plant can rely on its isolation valves and this speedy emergency shut-off action provides the reassurance of complete safety, with a quality valve designed to stop the flow of a hazardous fluid or gas upon the detection of a dangerous event.
ARI-Armaturen UK Ltd T: 01684 275752 E:
enquiries@uk.ari-armaturen.com
zetrix.ari-armaturen.com/uk
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