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Water mist know-how continues to be a comparatively new concept when it comes to hearth suppression, but it’s proving to be an exciting growth within the industry. As the business evolves, so do the regulations, laws and necessities so as to improve security and enable improvement. These can vary largely from nation to country, and even area to area.
The means in which a water mist system operates is an identical mechanism to the traditional sprinkler system in that the nozzles are usually activated via a bulb which blows at a specific temperature allowing for the activation of the mist by way of a low-pressure water piping system.
Here we take a look at how some water mist nozzles are produced and put in – from arriving as a big ‘bar’ of metal, to changing into the efficient water mist nozzles we see put in in many new projects/developments throughout much of the globe at present.
The steel arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for lots of elements as this may be very sturdy and corrosion resistant in comparison to other related metals. The physique is machined out of Brass CZ121, which arrives as massive bars of metal which would possibly be delivered to the warehouse in 3m lengths. This is then minimize into two smaller elements able to insert into the machine. Not all water mist companies have the flexibility to machine the components they require in-house though it can prove very useful for cost and production purposes as we are about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is provided with carbide tooling and high-pressure via coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case difficult parts. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in 51 seconds, utterly automated – this implies it could turnover an incredible 4,000 filters in a weekend utterly unmanned.
The brass heads are additionally de-burred on the machine, removing all sharp edges before being polished and sent for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to become rather more durable. All components are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing levels.
Assembly
There are many small parts of varied shapes and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of thirteen elements or ‘components’. These elements are then meticulously put collectively and assembled by the production team requiring a fair quantity of labour earlier than the ultimate product is achieved. Various stages embrace tightening with specially tailored tools, pressing using a hand-press and utilizing a specific ‘Locktite’ formula at some phases which is a threadlock that forestalls fixings from coming free during the operational lifetime of the product. The ultimate stage of meeting is fastidiously loading the bulb and applying the proper load to it using a torque wrench.
The assembled nozzles are then positioned on one other machine so as to be labelled and uniquely recognized using a serial number. At Dual Mist Ltd that is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are ready to be positioned via the varied stages of testing.
Testing
Cull Testing
Also often recognized as bubble testing in layman’s terms, this take a look at is to ensure no damage has occurred to the bulb during meeting and is a important check for LPCB approval. The take a look at involves using a high-powered microscope to measure the dimensions of the bubble in every bulb earlier than inserting in heat water so as to shrink the scale of the bubble to nothing. Once that is checked, the nozzles are then left to rest and return to room temperature before the bubble is measured as quickly as again so as to guarantee it has returned to the unique measurement inside a small tolerance.
Leak Testing
Every nozzle is also 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 may occur if filth is trapped throughout the seal face.
Activation Testing
On a month-to-month foundation, random nozzles are also tested for activation by placing the nozzle on a strain jig at various pressures and making use of heat to the bulbs. The nozzles should all activate cleanly throughout the entire strain range specified to that nozzle.
A member of the production team makes use of a microscope and software to find out the dimensions of every bubble in the bulb.
Approvals
At Dual Mist Ltd, these checks aren’t just to assure the quality of the production line but are additionally an necessary a half of the LPCB Approval. These approvals allow prospects to recognise that the products they’re buying are made to the very best possible quality normal in the area.
The drawback to that is that the Approval Testing system may be each pricey and time-consuming – sometimes needing to be booked several months in advance and requiring years of hard work to realize.
The nozzles produced by Dual Mist have been put via their paces at BRE Global when it comes to both hearth testing and component/type approval.
Tamper proofing
In order to make certain that no one is tempted to intervene with the grub screw holding the bulb, a small plastic bung is pressed into the grub screw. The stress load setting on the bulb is then subsequently fastened.
The nozzles are then ready to be packaged and despatched off for set up.
Here is an example of a control panel having been installed 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 steel pipes often utilized in high-pressure systems, low-pressure water methods can use CPVC piping. This is a particular sort of fire-resistant plastic enabling fast set up. Instead of threading every pipe, a heated glue can be utilized to shortly construct massive pipe networks. These networks are accredited to deal with as much as 12 bar stress. เกรดวัดแรงดัน are screwed right into a special pipe adaptor utilizing a half-inch fuel fitting.
An electric control panel is fitted for the system control along with pumps and a water tank, often with a mains feed.
The system is tested, signed off and handed over to the client.
The ultimate product as quickly as put in. This shows how we anticipate to see the nozzles once a challenge has been completed.
Conclusion
As we are ready to see there are numerous phases to go from metal to nozzle head with each nozzle taking a significant effort by numerous professionals to finish to the accredited standard.
Not solely do water mist nozzles require a quantity of phases of machining and assembling, they need to also bear a string of exams so as to be permitted for set up. Once installed, there are even further checks undergone, sometimes by third-party organisations in order for the complete fire suppression system to finally be handed over to the client.
Water mist know-how assures safety, quality and assurance via the stringent testing that’s required.
With the latest publication of water mist standards, particularly in Britain over current years, building builders can now be assured that the quality required for water mist systems is now at an equivalent standard to different suppression systems.
For extra information, go to www.dualmist.com
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