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Water mist technology is still a relatively new concept when it comes to fireplace suppression, yet it’s proving to be an thrilling growth within the business. As the trade evolves, so do the laws, laws and requirements in order to enhance safety and allow development. These can range largely from nation to nation, and even area to area.
The way in which a water mist system operates is a similar mechanism to the standard sprinkler system in that the nozzles are often activated via a bulb which blows at a specific 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 large ‘bar’ of metallic, to turning into the efficient water mist nozzles we see installed in many new projects/developments throughout a lot of the globe today.
The metallic arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many components as it is extremely durable and corrosion resistant in comparability to other comparable metals. The physique is machined out of Brass CZ121, which arrives as massive bars of steel that are delivered to the warehouse in 3m lengths. This is then cut into two smaller components able to insert into the machine. Not all water mist companies have the power to machine the parts they require in-house though it could prove very beneficial for cost and production purposes as we’re about to see.
เกจวัดแรงดัน is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is supplied with carbide tooling and high-pressure by way of coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise complicated elements. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in fifty one seconds, fully automated – this means it can turnover an incredible four,000 filters in a weekend fully unmanned.
The brass heads are additionally de-burred on the machine, eradicating all sharp edges before being polished and sent for Electroless Nickel Plating. This supplies a corrosion-proof coating to the brass, enabling it to turn into much more sturdy. All elements are then inspected for dimensional accuracy earlier than the meeting stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing stages.
Assembly
There are many small parts of various 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 components or ‘components’. These elements are then meticulously put together and assembled by the production team requiring a fair amount of labour before the ultimate product is achieved. Various levels embody tightening with specially adapted tools, pressing utilizing a hand-press and utilizing a particular ‘Locktite’ method at some levels which is a threadlock that forestalls fixings from coming loose during the operational lifetime of the product. The last 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 recognized using a serial quantity. At Dual Mist Ltd that is done on a Technifor Laser Engraver fitted with a 4th axis unit before they are ready to be placed through the varied levels of testing.
Testing
Cull Testing
Also often recognized as bubble testing in layman’s terms, this check is to ensure no harm has occurred to the bulb throughout assembly and is a important check for LPCB approval. The test entails using a high-powered microscope to measure the scale of the bubble in every bulb earlier than inserting 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 before the bubble is measured as quickly as again so as to guarantee it has returned to the original size inside a small tolerance.
Leak Testing
Every nozzle can be stringently examined for leaks by applying 24-bar pressure for 1 hour and ensuring no water has escaped. It is uncommon for any leaks on the manufacturing line, however that is a particularly very important stage of the testing as leaks might happen if dust is trapped throughout the seal face.
Activation Testing
On a monthly foundation, random nozzles are additionally examined for activation by placing the nozzle on a pressure jig at varied pressures and making use of heat to the bulbs. The nozzles should all activate cleanly across the complete strain range specified to that nozzle.
A member of the production group uses a microscope and software program to determine the dimensions of every bubble within the bulb.
Approvals
At Dual Mist Ltd, these exams are not simply to guarantee the standard of the manufacturing line but are also an important part of the LPCB Approval. These approvals enable prospects to recognise that the products they’re buying are made to the very best possible high quality standard in the region.
The disadvantage to that is that the Approval Testing system could be both pricey and time-consuming – typically needing to be booked a quantity of months prematurely and requiring years of onerous work to attain.
The nozzles produced by Dual Mist have been put via their paces at BRE Global when it comes to each fireplace testing and component/type approval.
Tamper proofing
In order to ensure that nobody is tempted to intrude 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 able to be packaged and sent off for installation.
Here is an instance of a control panel having been put in in The Claridges Hotel, London, UK. This is the place the system is operated.
Installation
Rather than having to use the heavy and labour-intensive metal pipes typically utilized in high-pressure systems, low-pressure water techniques can use CPVC piping. This is a particular kind of fire-resistant plastic enabling quick set up. Instead of threading each pipe, a heated glue can be utilized to quickly construct massive pipe networks. These networks are approved to deal with as much as 12 bar strain. The nozzles are screwed right into a special pipe adaptor using a half-inch fuel becoming.
เกจ์แรงดัน is fitted for the system management along with pumps and a water tank, usually with a mains feed.
The system is examined, signed off and handed over to the shopper.
The ultimate product as quickly as installed. This exhibits how we anticipate to see the nozzles once a challenge has been accomplished.
Conclusion
As we are ready to see there are heaps of levels to go from metallic to nozzle head with every nozzle taking a significant effort by various professionals to complete to the accredited commonplace.
Not solely do water mist nozzles require a quantity of phases of machining and assembling, they must additionally endure a string of checks to find a way to be permitted for installation. Once put in, there are even additional tests undergone, typically by third-party organisations to guarantee that the complete fireplace suppression system to lastly be handed over to the client.
Water mist technology assures safety, quality and assurance by way of the stringent testing that is required.
With the current publication of water mist requirements, particularly in Britain over latest years, building developers can now be assured that the standard required for water mist methods is now at an equal standard to different suppression systems.
For extra information, go to www.dualmist.com
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