Introducing water mist expertise – Part 2

Water mist expertise is still a comparatively new idea when it comes to fireplace suppression, yet it is proving to be an thrilling improvement in the trade. As the industry evolves, so do the laws, legal guidelines and necessities in order to improve safety and enable development. These can differ largely from country to country, and even area to region.
The means in which a water mist system operates is an identical mechanism to the standard sprinkler system in that the nozzles are usually activated via a bulb which blows at a selected temperature permitting for the activation of the mist via a low-pressure water piping system.
Here we have a look at how some water mist nozzles are produced and installed – from arriving as a big ‘bar’ of metallic, to changing into the efficient water mist nozzles we see put in in plenty of new projects/developments across a lot of the globe at present.
The metal arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for a lot of components as this could be very durable and corrosion resistant compared to different comparable metals. The physique is machined out of Brass CZ121, which arrives as large bars of metallic which may be delivered to the warehouse in 3m lengths. This is then minimize into two smaller elements ready to insert into the machine. Not all water mist firms have the ability to machine the elements they require in-house though it could show very useful for value and production purposes as we are about to see.
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is provided with carbide tooling and high-pressure through coolant systems, 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 parts.
A Citizen L12 additionally makes the filters with a capability of drilling 365 holes in fifty one seconds, fully automated – this means it could turnover an unbelievable four,000 filters in a weekend utterly unmanned.
The brass heads are additionally 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 into far 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.
There are many small elements of varied 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 elements or ‘components’. These elements are then meticulously put collectively and assembled by the production team requiring a fair amount of labour earlier than the final product is achieved. Various stages embody tightening with specifically adapted tools, urgent using a hand-press and utilizing a particular ‘Locktite’ formula at some stages which is a threadlock that prevents fixings from coming loose through the operational lifetime of the product. The final stage of meeting is fastidiously loading the bulb and applying the proper load to it utilizing a torque wrench.
The assembled nozzles are then positioned on one other machine to be able to be labelled and uniquely recognized utilizing a serial number. At Dual Mist Ltd that is done on a Technifor Laser Engraver fitted with a 4th axis unit before they are able to be placed via the various stages of testing.
Cull Testing
Also often identified as bubble testing in layman’s terms, this check is to make sure no damage has occurred to the bulb during assembly and is a important take a look at for LPCB approval. The check includes using a high-powered microscope to measure the scale of the bubble in each bulb earlier than placing in heat water to be able to shrink the dimensions of the bubble to nothing. Once this is checked, the nozzles are then left to rest and return to room temperature earlier than the bubble is measured as quickly as once more so as to ensure it has returned to the original dimension inside a small tolerance.
Leak Testing
Every nozzle is also stringently examined for leaks by making use of 24-bar stress for 1 hour and making certain no water has escaped. It is rare for any leaks on the manufacturing line, however this is an extremely very important stage of the testing as leaks could happen if dirt is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally examined for activation by putting the nozzle on a stress jig at various pressures and making use of heat to the bulbs. The nozzles ought to all activate cleanly throughout the whole stress vary specified to that nozzle.
A member of the production group uses a microscope and software to find out the size of each bubble within the bulb.
At Dual Mist Ltd, these exams are not simply to assure the quality of the manufacturing line but are additionally an important part of the LPCB Approval. These approvals allow customers to recognise that the products they’re buying are made to the very best possible high quality standard in the region.
The disadvantage to this is that the Approval Testing system can be each costly and time-consuming – generally needing to be booked several months prematurely and requiring years of exhausting work to achieve.
The nozzles produced by Dual Mist have been put via their paces at BRE Global in phrases of each fireplace testing and component/type approval.
Tamper proofing
In order to guarantee that no person is tempted to intrude 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 fixed.
The nozzles are then able to be packaged and despatched off for set up.
Here is an example of a management panel having been put in in The Claridges Hotel, London, UK. This is where the system is operated.
Rather than having to use the heavy and labour-intensive metallic pipes usually utilized in high-pressure methods, low-pressure water techniques can use CPVC piping. This is a special kind of fire-resistant plastic enabling fast installation. Instead of threading each pipe, a heated glue can be used to quickly build giant pipe networks. These networks are accredited to deal with up to 12 bar strain. The nozzles are screwed into a special pipe adaptor utilizing a half-inch fuel becoming.
An electric management panel is fitted for the system management along with pumps and a water tank, usually with a mains feed.
The system is tested, signed off and handed over to the shopper.
The ultimate product as soon as put in. This exhibits how we count on to see the nozzles once a venture has been completed.
As we will see there are lots of levels to go from metal to nozzle head with every nozzle taking a major effort by various professionals to complete to the accredited normal.
Not solely do water mist nozzles require a number of stages of machining and assembling, they must additionally endure a string of exams to find a way to be approved for set up. Once put in, there are even further exams undergone, typically by third-party organisations to guarantee that the whole fireplace suppression system to finally be handed over to the client.
pressure gauge ไฮ ด รอ ลิ ค assures safety, high quality and assurance by way of the stringent testing that’s required.
With the current publication of water mist requirements, notably in Britain over current years, building developers can now be assured that the standard required for water mist systems is now at an equivalent normal to other suppression systems.
For more data, go to
Share this:

Scroll to Top