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Introducing water mist technology – Part 2

Water mist know-how is still a relatively new concept when it comes to fireplace suppression, yet it is proving to be an exciting development within the trade. As the business evolves, so do the regulations, legal guidelines and requirements in order to improve security and enable development. These can range largely from nation to nation, and even area to region.
The method in which a water mist system operates is an identical mechanism to the normal sprinkler system in that the nozzles are normally activated by way of a bulb which blows at a selected temperature permitting for the activation of the mist via a low-pressure water piping system.
Here we take a look at how some water mist nozzles are produced and installed – from arriving as a big ‘bar’ of steel, to becoming the environment friendly water mist nozzles we see installed in many new projects/developments throughout a lot of the globe today.
The metal arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of parts as this can be very durable and corrosion resistant in comparability to other related metals. The physique is machined out of Brass CZ121, which arrives as massive bars of metal that are delivered to the warehouse in 3m lengths. This is then reduce into two smaller parts able to insert into the machine. Not all water mist firms have the ability to machine the parts they require in-house although it could prove very beneficial for cost and manufacturing purposes as we’re about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is equipped with carbide tooling and high-pressure by way of coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case complicated parts. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, fully automated – this implies it may possibly turnover an unimaginable 4,000 filters in a weekend completely unmanned.
The brass heads are also de-burred on the machine, eradicating all sharp edges earlier than being polished and despatched for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to turn out to be much more durable. All components are then inspected for dimensional accuracy before the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing levels.
Assembly
There are many small components of various shapes and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a complete of thirteen parts or ‘components’. These elements are then meticulously put together and assembled by the production team requiring a fair quantity of labour before the final product is achieved. Various stages embrace tightening with specifically adapted instruments, urgent utilizing a hand-press and using a specific ‘Locktite’ formula at some stages which is a threadlock that prevents fixings from coming loose during the operational lifetime of the product. The final stage of assembly is fastidiously loading the bulb and making use of the correct load to it using a torque wrench.
The assembled nozzles are then positioned on another machine to be able to be labelled and uniquely identified utilizing a serial quantity. At Dual Mist Ltd that is done on a Technifor Laser Engraver fitted with a 4th axis unit before they’re able to be placed through the various stages of testing.
Testing
Cull Testing
Also often identified as bubble testing in layman’s terms, this take a look at is to ensure no harm has occurred to the bulb throughout meeting and is a crucial test for LPCB approval. The check entails using a high-powered microscope to measure the scale of the bubble in each bulb before inserting in heat water in order to shrink the scale of the bubble to nothing. Once this is checked, the nozzles are then left to rest and return to room temperature before the bubble is measured as quickly as once more in order to guarantee it has returned to the original size within a small tolerance.
Leak Testing
Every nozzle can additionally be stringently tested for leaks by applying 24-bar pressure for 1 hour and guaranteeing no water has escaped. It is uncommon for any leaks on the production line, but that is a particularly vital stage of the testing as leaks might happen if dust is trapped throughout the seal face.
Activation Testing
On a month-to-month basis, random nozzles are additionally examined for activation by placing the nozzle on a stress jig at various pressures and applying warmth to the bulbs. The nozzles ought to all activate cleanly throughout the whole strain range specified to that nozzle.
A member of the production staff uses a microscope and software program to discover out the size of every bubble within the bulb.
Approvals
At Dual Mist Ltd, these exams are not just to guarantee the standard of the manufacturing line however are also an necessary part of the LPCB Approval. These approvals enable clients to recognise that the merchandise they are shopping for are made to the best attainable high quality commonplace in the area.
The drawback to this is that the Approval Testing system could be each pricey and time-consuming – generally needing to be booked a number of months prematurely and requiring years of onerous work to achieve.
The nozzles produced by Dual Mist have been put through their paces at BRE Global when it comes to each fireplace testing and component/type approval.
Tamper proofing
In order to guarantee that no one is tempted to interfere with the grub screw holding the bulb, a small plastic bung is pressed into the grub screw. The strain load setting on the bulb is then subsequently fastened.
The nozzles are then able to be packaged and despatched off for set up.
Here is an instance of a control panel having been put in in The Claridges Hotel, London, UK. This is where the system is operated.
Installation
Rather than having to make use of the heavy and labour-intensive metallic pipes typically utilized in high-pressure techniques, low-pressure water systems can use CPVC piping. This is a special kind of fire-resistant plastic enabling quick installation. Instead of threading each pipe, a heated glue can be utilized to quickly build giant pipe networks. These networks are permitted to deal with up to 12 bar pressure. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gas becoming.
An electrical management panel is fitted for the system control along with pumps and a water tank, normally with a mains feed.
The system is tested, signed off and handed over to the client.
The ultimate product once installed. This reveals how we count on to see the nozzles as soon as a challenge has been accomplished.
Conclusion
As we can see there are many phases to go from metal to nozzle head with each nozzle taking a major effort by varied professionals to finish to the accredited normal.
Not only do water mist nozzles require multiple phases of machining and assembling, they want to also bear a string of exams so as to be approved for set up. Once installed, there are even additional checks undergone, typically by third-party organisations in order for the whole hearth suppression system to finally be handed over to the shopper.
เพรสเชอร์เกจ assures security, quality and assurance via the stringent testing that’s required.
With the current publication of water mist standards, notably in Britain over current years, constructing builders can now be assured that the standard required for water mist techniques is now at an equal standard to other suppression techniques.
For extra info, go to www.dualmist.com
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