Introducing water mist know-how – Part 2

Water mist technology is still a relatively new idea by method of fireplace suppression, but it’s proving to be an thrilling development in the business. As the trade evolves, so do the regulations, laws and requirements in order to enhance safety and enable growth. These can differ largely from nation to nation, and even region to area.
The way during which a water mist system operates is an identical mechanism to the normal sprinkler system in that the nozzles are often activated via a bulb which blows at a particular temperature allowing for the activation of the mist through 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 becoming the efficient water mist nozzles we see put in in many new projects/developments across a lot of the globe at present.
The metallic arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for lots of components 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 large bars of metallic which might be delivered to the warehouse in 3m lengths. This is then minimize into two smaller components able to insert into the machine. Not all water mist firms have the flexibility to machine the elements they require in-house though it can prove very useful for price and manufacturing functions as we are about to see.
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is supplied with carbide tooling and high-pressure through coolant systems, with the twin-spindle and twin-turret making haste of the otherwise difficult components. A Citizen M532 Sliding Head Lathe is used for the smaller elements.
A Citizen L12 additionally makes the filters with a capability of drilling 365 holes in 51 seconds, completely automated – this means it could possibly turnover an unbelievable four,000 filters in a weekend utterly unmanned.
The brass heads are also de-burred on the machine, eradicating all sharp edges before being polished and despatched for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn out to be rather more sturdy. All parts are then inspected for dimensional accuracy before the assembly stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing stages.
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There are many small components of assorted styles and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of 13 components or ‘components’. These parts are then meticulously put together and assembled by the manufacturing team requiring a good quantity of labour earlier than the final product is achieved. Various stages include tightening with specifically adapted tools, urgent utilizing a hand-press and using a selected ‘Locktite’ method at some stages which is a threadlock that forestalls fixings from coming free during the operational lifetime of the product. The final stage of assembly is rigorously loading the bulb and making use of the right load to it utilizing a torque wrench.
The assembled nozzles are then positioned on another machine to have the ability to be labelled and uniquely recognized using a serial number. At Dual Mist Ltd this is done on a Technifor Laser Engraver fitted with a 4th axis unit before they’re ready to be placed through the varied levels of testing.
Cull Testing
Also often recognized 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 critical test for LPCB approval. The check entails using a high-powered microscope to measure the size of the bubble in each bulb before inserting in warm water in order to shrink the size 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 once once more to be able to guarantee it has returned to the original size inside 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 manufacturing line, however that is an extremely important stage of the testing as leaks might happen if dust is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally examined for activation by inserting the nozzle on a strain jig at numerous pressures and making use of heat to the bulbs. The nozzles ought to all activate cleanly throughout the entire pressure vary specified to that nozzle.
A member of the production team uses a microscope and software program to discover out the size of every bubble within the bulb.
At Dual Mist Ltd, these exams usually are not simply to guarantee the standard of the production line however are additionally an necessary part of the LPCB Approval. These approvals allow prospects to recognise that the products they are buying are made to the highest potential high quality normal within the area.
The disadvantage to this is that the Approval Testing system can be each expensive and time-consuming – typically needing to be booked several months in advance and requiring years of exhausting work to attain.
The nozzles produced by Dual Mist have been put via their paces at BRE Global by means of each hearth testing and component/type approval.
Tamper proofing
In order to ensure 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 pressure load setting on the bulb is then subsequently mounted.
The nozzles are then able to be packaged and sent off for set up.
Here is an example of a control panel having been put in in The Claridges Hotel, London, UK. This is the place the system is operated.
Rather than having to use the heavy and labour-intensive metallic pipes usually used in high-pressure techniques, low-pressure water techniques can use CPVC piping. This is a special kind of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be used to quickly construct large pipe networks. These networks are permitted to handle as much as 12 bar stress. The nozzles are screwed right into a particular pipe adaptor utilizing a half-inch gasoline fitting.
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 examined, signed off and handed over to the client.
The ultimate product as soon as put in. This reveals how we count on to see the nozzles as quickly as a venture has been accomplished.
As we can see there are lots of phases to go from steel to nozzle head with each nozzle taking a major effort by various professionals to complete to the accredited standard.
Not solely do water mist nozzles require a quantity of levels of machining and assembling, they must also bear a string of checks in order to be permitted for installation. Once put in, there are even additional checks undergone, sometimes by third-party organisations to guarantee that the complete fire suppression system to finally be handed over to the client.
Water mist expertise assures safety, quality and assurance by way of the stringent testing that is required.
With the current publication of water mist standards, notably in Britain over current years, building builders can now be assured that the quality required for water mist methods is now at an equal normal to different suppression systems.
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