Water mist know-how is still a comparatively new concept in phrases of fireplace suppression, but it is proving to be an thrilling improvement in the trade. As the industry evolves, so do the rules, laws and requirements to have the ability to improve safety and enable improvement. These can differ largely from nation to nation, and even area to region.
The method by which a water mist system operates is a similar mechanism to the traditional sprinkler system in that the nozzles are normally activated via a bulb which blows at a selected 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 large ‘bar’ of metallic, to becoming the efficient water mist nozzles we see installed in many new projects/developments throughout a lot of the globe today.
The metal arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many parts as this can be very sturdy and corrosion resistant in comparability to different related metals. The body is machined out of Brass CZ121, which arrives as large bars of metallic which would possibly be delivered to the warehouse in 3m lengths. This is then cut into two smaller elements able to insert into the machine. Not all water mist firms have the power to machine the parts they require in-house though it might possibly prove very beneficial for price 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 supplied with carbide tooling and high-pressure through coolant techniques, 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 elements.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in fifty one seconds, completely automated – this means it could 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 before being polished and despatched for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to turn into much more durable. All elements are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing stages.
Assembly
There are many small elements of various styles 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 parts are then meticulously put together and assembled by the manufacturing team requiring a fair quantity of labour before the ultimate product is achieved. Various levels include tightening with specially adapted tools, pressing using a hand-press and using a selected ‘Locktite’ formulation at some phases which is a threadlock that stops fixings from coming free during the operational lifetime of the product. The final stage of meeting is rigorously loading the bulb and making use of the proper load to it using a torque wrench.
The assembled nozzles are then positioned on one other machine so as to be labelled and uniquely recognized using a serial number. At Dual Mist Ltd that is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re ready to be placed through the varied stages of testing.
Testing
Cull Testing
Also generally known as bubble testing in layman’s phrases, this take a look at is to make sure no injury has occurred to the bulb throughout meeting and is a critical test for LPCB approval. The check includes utilizing a high-powered microscope to measure the scale of the bubble in each bulb earlier than inserting in heat water to have the ability 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 before the bubble is measured as soon as again in order to guarantee it has returned to the original measurement inside a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by making use of 24-bar stress for 1 hour and ensuring no water has escaped. It is rare for any leaks on the production line, however this is an extremely very important stage of the testing as leaks could happen if filth is trapped within the seal face.
Activation Testing
On a monthly basis, random nozzles are also tested for activation by inserting the nozzle on a strain jig at numerous pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly across the entire pressure vary 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 aren’t simply to assure the standard of the manufacturing line however are also an important a half of the LPCB Approval. These approvals enable clients to recognise that the products they are shopping for are made to the best attainable quality standard within the area.
The drawback to that is that the Approval Testing system could be each costly and time-consuming – sometimes needing to be booked several months in advance and requiring years of exhausting work to achieve.
The nozzles produced by Dual Mist have been put through their paces at BRE Global in phrases of both fire testing and component/type approval.
Tamper proofing
In order to ensure that no one 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 fixed.
The nozzles are then able to be packaged and sent off for installation.
Here is an instance 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 make use of the heavy and labour-intensive steel pipes often used in high-pressure systems, low-pressure water techniques can use CPVC piping. This is a particular type of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be used to quickly construct giant pipe networks. These networks are approved to handle as much as 12 bar strain. The nozzles are screwed right into a special pipe adaptor using a half-inch gasoline fitting.
An electrical control panel is fitted for the system management together with pumps and a water tank, normally with a mains feed.
The system is tested, signed off and handed over to the consumer.
The last product as quickly as put in. This exhibits how we expect to see the nozzles as quickly as a challenge has been accomplished.
Conclusion
As we will see there are heaps of phases to go from metal to nozzle head with every nozzle taking a significant effort by numerous professionals to complete to the approved commonplace.
เกจวัดแรงดันลมดิจิตอล do water mist nozzles require a number of levels of machining and assembling, they must also endure a string of tests to be able to be permitted for installation. Once installed, there are even additional exams undergone, typically by third-party organisations to guarantee that the entire fireplace suppression system to lastly be handed over to the client.
Water mist technology assures safety, high quality and assurance through the stringent testing that is required.
With the current publication of water mist requirements, significantly in Britain over latest years, constructing builders can now be assured that the standard required for water mist techniques is now at an equivalent commonplace to different suppression techniques.
For extra info, go to www.dualmist.com
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