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Water mist technology is still a comparatively new idea by means of fireplace suppression, yet it’s proving to be an thrilling improvement within the trade. As the trade evolves, so do the rules, laws and necessities so as to improve security and allow growth. These can vary largely from country to nation, and even area to region.
The method during which a water mist system operates is a similar mechanism to the normal sprinkler system in that the nozzles are usually activated through a bulb which blows at a selected temperature allowing 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 metallic, to becoming the environment friendly water mist nozzles we see put in in many new projects/developments throughout much of the globe right now.
The metallic arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for many parts as it is extremely durable and corrosion resistant compared to different similar metals. The physique is machined out of Brass CZ121, which arrives as massive bars of metallic which are delivered to the warehouse in 3m lengths. This is then cut into two smaller parts ready to insert into the machine. Not all water mist companies have the power to machine the elements they require in-house though it could possibly prove very useful for cost and manufacturing purposes as we are 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 in any other case sophisticated components. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in 51 seconds, utterly automated – this implies it might 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 sent for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to become far more durable. All elements are then inspected for dimensional accuracy before the assembly stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing levels.
Assembly
There are many small parts of varied sizes and shapes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a complete of 13 elements or ‘components’. These elements are then meticulously put collectively and assembled by the production group requiring a fair quantity of labour before the ultimate product is achieved. Various stages include tightening with specifically tailored instruments, pressing using a hand-press and using a selected ‘Locktite’ formula at some stages which is a threadlock that forestalls fixings from coming loose through the operational lifetime of the product. The final stage of meeting is fastidiously loading the bulb and making use of the proper load to it utilizing a torque wrench.
The assembled nozzles are then positioned on another machine to be able to be labelled and uniquely identified using 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 through the various stages of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s phrases, this test is to make sure no injury has occurred to the bulb throughout meeting and is a critical take a look at for LPCB approval. The test includes using a high-powered microscope to measure the scale of the bubble in each bulb before placing in heat water in order to shrink the size of the bubble to nothing. Once that 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 in order to ensure it has returned to the original dimension inside a small tolerance.
Leak Testing
Every nozzle can additionally be stringently tested for leaks by making use of 24-bar strain for 1 hour and guaranteeing no water has escaped. It is uncommon for any leaks on the manufacturing line, but this is an extremely very important stage of the testing as leaks may occur if dust is trapped inside the seal face.
Activation Testing
On a month-to-month foundation, random nozzles are also tested for activation by inserting the nozzle on a strain jig at varied pressures and applying warmth to the bulbs. The nozzles ought to all activate cleanly across the complete strain range specified to that nozzle.
A member of the production group uses a microscope and software to determine the scale of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these exams usually are not just to guarantee the quality of the production line however are additionally an essential part of the LPCB Approval. These approvals enable prospects to recognise that the merchandise they are shopping for are made to the very best potential high quality standard within the area.
The drawback to that is that the Approval Testing system could be both costly and time-consuming – sometimes needing to be booked a number of months prematurely and requiring years of onerous work to realize.
The nozzles produced by Dual Mist have been put through their paces at BRE Global when it comes to each fire testing and component/type approval.
Tamper proofing
In order to make sure 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 strain load setting on the bulb is then subsequently mounted.
The nozzles are then ready to be packaged and despatched off for installation.
Here is an instance 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 use the heavy and labour-intensive steel pipes usually utilized in high-pressure methods, 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 massive pipe networks. These networks are approved to deal with up to 12 bar stress. เกจวัดแก๊ส are screwed into a special pipe adaptor utilizing a half-inch gasoline becoming.
An electric management panel is fitted for the system control together with pumps and a water tank, normally with a mains feed.
The system is examined, signed off and handed over to the client.
The final product once put in. This reveals how we count on to see the nozzles as soon as a project has been completed.
Conclusion
As we can see there are heaps of stages to go from steel to nozzle head with every nozzle taking a major effort by numerous professionals to complete to the approved commonplace.
Not only do water mist nozzles require multiple levels of machining and assembling, they need to additionally bear a string of tests to be able to be permitted 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.
Water mist expertise assures safety, quality and assurance via the stringent testing that is required.
With the recent publication of water mist standards, particularly in Britain over latest years, building builders can now be assured that the quality required for water mist techniques is now at an equal normal to different suppression techniques.
For more info, go to www.dualmist.com
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