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Water mist know-how continues to be a comparatively new idea by means of fireplace suppression, but it’s proving to be an exciting improvement in the business. As the industry evolves, so do the rules, laws and necessities so as to enhance security and enable growth. These can range largely from nation to nation, and even area to region.
The way during which a water mist system operates is a similar mechanism to the traditional sprinkler system in that the nozzles are often activated through a bulb which blows at a selected temperature permitting 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 put in – from arriving as a large ‘bar’ of metallic, to becoming the efficient water mist nozzles we see installed in many new projects/developments throughout much of the globe at present.
The metal arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for many elements as it is extremely sturdy and corrosion resistant compared to other related metals. The body is machined out of Brass CZ121, which arrives as massive bars of metal which are delivered to the warehouse in 3m lengths. This is then reduce into two smaller parts ready to insert into the machine. Not all water mist firms have the power to machine the components they require in-house though it may possibly show very helpful for price and manufacturing purposes as we’re about to see.
Machining
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is provided with carbide tooling and high-pressure by way of coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case complicated elements. 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 fifty one seconds, fully automated – this means it could possibly turnover an unimaginable four,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 supplies a corrosion-proof coating to the brass, enabling it to become rather 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 levels.
Assembly
There are many small elements of various sizes and shapes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of 13 elements or ‘components’. These components are then meticulously put together and assembled by the production group requiring a good amount of labour earlier than the final product is achieved. เกจแรงดันน้ำ embody tightening with specifically tailored tools, urgent using a hand-press and utilizing a particular ‘Locktite’ method at some levels which is a threadlock that prevents fixings from coming free in the course of the operational lifetime of the product. The ultimate stage of meeting is carefully loading the bulb and making use of the right load to it using a torque wrench.
The assembled nozzles are then placed on another machine in order to be labelled and uniquely identified 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 able to be placed via the varied phases of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s terms, this check is to make sure no damage has occurred to the bulb throughout meeting and is a crucial test for LPCB approval. The test includes using a high-powered microscope to measure the size of the bubble in every bulb earlier than 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 earlier than the bubble is measured as soon as again so as to ensure it has returned to the original dimension inside a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by making use of 24-bar pressure for 1 hour and ensuring no water has escaped. It is uncommon for any leaks on the production line, but this is an extremely vital stage of the testing as leaks might happen if filth is trapped inside the seal face.
Activation Testing
On a month-to-month basis, random nozzles are additionally tested for activation by placing the nozzle on a pressure jig at numerous pressures and making use of heat to the bulbs. The nozzles should all activate cleanly throughout the whole pressure range specified to that nozzle.
A member of the production staff uses a microscope and software program to determine the dimensions of each bubble within the bulb.
Approvals
At Dual Mist Ltd, these exams are not just to guarantee the quality of the production line however are also an important a part of the LPCB Approval. These approvals allow prospects to recognise that the merchandise they are shopping for are made to the highest attainable high quality standard in the region.
The disadvantage to that is that the Approval Testing system could be each costly and time-consuming – generally needing to be booked several months prematurely and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put through their paces at BRE Global by means of each fireplace testing and component/type approval.
Tamper proofing
In order to make sure 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 strain load setting on the bulb is then subsequently fixed.
The nozzles are then able to be packaged and despatched off for installation.
Here is an example of a management panel having been installed 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 steel pipes often used in high-pressure methods, low-pressure water systems can use CPVC piping. This is a particular type of fire-resistant plastic enabling quick installation. Instead of threading each pipe, a heated glue can be utilized to quickly construct large pipe networks. These networks are accredited to deal with up to 12 bar pressure. The nozzles are screwed right into a special pipe adaptor using a half-inch gasoline fitting.
An electric management panel is fitted for the system control along with pumps and a water tank, normally with a mains feed.
The system is examined, signed off and handed over to the consumer.
The final product as quickly as put in. This shows how we anticipate to see the nozzles as quickly as a venture has been completed.
Conclusion
As we will see there are many stages to go from metallic to nozzle head with every nozzle taking a big effort by varied professionals to finish to the permitted standard.
Not only do water mist nozzles require multiple stages of machining and assembling, they must also undergo a string of checks in order to be accredited for set up. Once installed, there are even additional exams undergone, typically by third-party organisations in order for the entire fire suppression system to finally be handed over to the shopper.
Water mist expertise assures safety, quality and assurance by way of the stringent testing that’s required.
With the current publication of water mist requirements, significantly in Britain over recent years, constructing developers can now be assured that the standard required for water mist methods is now at an equal standard to different suppression methods.
For more information, go to www.dualmist.com
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