Introducing water mist know-how – Part 2

Water mist expertise remains to be a relatively new idea in terms of hearth suppression, but it is proving to be an thrilling improvement in the business. As the business evolves, so do the laws, laws and requirements to find a way to enhance safety and allow improvement. These can differ largely from nation to nation, and even region to region.
The method by which a water mist system operates is an identical mechanism to the standard sprinkler system in that the nozzles are usually activated by way of a bulb which blows at a selected temperature permitting for the activation of the mist through a low-pressure water piping system.
Here we have a look at how some water mist nozzles are produced and put in – from arriving as a large ‘bar’ of metal, to changing into the efficient water mist nozzles we see put in in many new projects/developments throughout a lot of the globe today.
The steel arrives for chopping

Here at Dual Mist Ltd, Stainless Steel 304 is used for many components as it is extremely durable and corrosion resistant in comparability to different comparable metals. The body is machined out of Brass CZ121, which arrives as giant bars of metallic 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 companies have the flexibility to machine the parts they require in-house although it could prove very helpful for price and manufacturing functions as we’re about to see.
Machining

The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is provided with carbide tooling and high-pressure through coolant methods, with the twin-spindle and twin-turret making haste of the otherwise sophisticated components. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 additionally makes the filters with a capability of drilling 365 holes in fifty one seconds, utterly automated – this means it might possibly turnover an unimaginable 4,000 filters in a weekend utterly 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 supplies a corrosion-proof coating to the brass, enabling it to turn into much more durable. All parts are then inspected for dimensional accuracy earlier than the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
Assembly

There are many small elements of assorted shapes and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of 13 parts or ‘components’. These elements are then meticulously put collectively and assembled by the production group requiring a good quantity of labour earlier than the ultimate product is achieved. Various levels embrace tightening with specially tailored instruments, urgent using a hand-press and using a particular ‘Locktite’ formula at some phases which is a threadlock that forestalls fixings from coming loose in the course of the operational lifetime of the product. The final stage of assembly is carefully loading the bulb and applying the correct load to it using a torque wrench.
The assembled nozzles are then positioned on one other machine to find a way to be labelled and uniquely recognized using a serial quantity. At Dual Mist Ltd that is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re able to be positioned through the varied levels of testing.
Testing

Cull Testing

Also generally known as bubble testing in layman’s terms, this take a look at is to make sure no damage has occurred to the bulb during meeting and is a important test for LPCB approval. The take a look at entails using a high-powered microscope to measure the dimensions of the bubble in each bulb earlier than placing in heat water in order 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 soon as again in order to ensure it has returned to the original dimension inside a small tolerance.
Leak Testing

Every nozzle can also be stringently tested for leaks by making use of 24-bar stress for 1 hour and ensuring no water has escaped. It is uncommon for any leaks on the production line, however this is a particularly very important stage of the testing as leaks might occur if filth is trapped inside the seal face.
Activation Testing

On a month-to-month basis, random nozzles are also examined for activation by placing the nozzle on a pressure jig at varied pressures and applying heat to the bulbs. The nozzles should all activate cleanly throughout the entire pressure vary specified to that nozzle.
A member of the manufacturing group makes use of a microscope and software to determine the size of every bubble within the bulb.
Approvals

At Dual Mist Ltd, these tests usually are not just to guarantee the standard of the manufacturing line but are additionally an important part of the LPCB Approval. These approvals enable clients to recognise that the merchandise they’re shopping for are made to the highest attainable quality commonplace in the region.
The disadvantage to this is that the Approval Testing system may be each pricey and time-consuming – sometimes needing to be booked several months upfront and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put through their paces at BRE Global when it comes to both fireplace testing and component/type approval.
Tamper proofing

In order to guarantee that nobody 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 mounted.
The nozzles are then ready to be packaged and despatched off for set up.
Here is an instance of a control panel having been installed in The Claridges Hotel, London, UK. This is the place the system is operated.
เกจวัดแรงดัน than having to use the heavy and labour-intensive metal pipes often utilized in high-pressure techniques, low-pressure water methods can use CPVC piping. This is a special sort of fire-resistant plastic enabling fast set up. Instead of threading each pipe, a heated glue can be used to shortly construct large pipe networks. These networks are permitted to handle as a lot as 12 bar strain. The nozzles are screwed into a particular pipe adaptor using a half-inch gasoline becoming.
An electric control panel is fitted for the system control together with pumps and a water tank, often with a mains feed.
The system is tested, signed off and handed over to the consumer.
The final product as soon as installed. This reveals how we count on to see the nozzles once a venture has been completed.
Conclusion

As we can see there are many levels to go from steel to nozzle head with each nozzle taking a big effort by varied professionals to finish to the approved commonplace.
Not solely do water mist nozzles require multiple stages of machining and assembling, they want to also bear a string of tests to find a way to be permitted for set up. Once installed, there are even additional exams undergone, generally by third-party organisations to guarantee that the whole fire suppression system to finally be handed over to the shopper.
Water mist technology assures security, high quality and assurance through the stringent testing that’s required.
With the latest publication of water mist standards, notably in Britain over recent years, building developers can now be assured that the quality required for water mist systems is now at an equal commonplace to different suppression methods.
For more information, go to www.dualmist.com

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