Water mist know-how is still a relatively new idea in phrases of fire suppression, yet it is proving to be an exciting development within the industry. As the business evolves, so do the laws, laws and necessities so as to enhance safety and enable improvement. These can differ largely from nation to country, and even area to region.
The means during which a water mist system operates is an analogous mechanism to the traditional sprinkler system in that the nozzles are usually activated through a bulb which blows at a particular temperature permitting for the activation of the mist by way of 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 steel, to changing into the environment friendly water mist nozzles we see put in in many new projects/developments throughout much of the globe right now.
The steel arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for a lot of elements as it is extremely sturdy and corrosion resistant compared to other similar metals. The body is machined out of Brass CZ121, which arrives as giant 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 elements they require in-house though it can prove very useful for cost and manufacturing functions as we’re about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is supplied with carbide tooling and high-pressure through coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise sophisticated components. 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 51 seconds, fully automated – this implies it may possibly turnover an unimaginable 4,000 filters in a weekend fully unmanned.
The brass heads are additionally de-burred on the machine, removing all sharp edges before being polished and despatched for Electroless Nickel Plating. หลักการทํางานของpressuregauge supplies a corrosion-proof coating to the brass, enabling it to become much more sturdy. All elements are then inspected for dimensional accuracy earlier than the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing levels.
Assembly
There are many small elements 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 13 parts or ‘components’. These parts are then meticulously put collectively and assembled by the production staff requiring a fair amount of labour before the final product is achieved. Various phases include tightening with specifically adapted instruments, urgent utilizing a hand-press and utilizing a particular ‘Locktite’ method at some phases which is a threadlock that prevents fixings from coming unfastened through 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 using a torque wrench.
The assembled nozzles are then positioned on one other machine so as to be labelled and uniquely identified using a serial number. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re able to be positioned via the varied levels of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s phrases, this check is to ensure no injury has occurred to the bulb during meeting and is a important take a look at for LPCB approval. The take a look at includes utilizing a high-powered microscope to measure the scale of the bubble in every bulb earlier than putting 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 once more in order to guarantee it has returned to the unique size within a small tolerance.
Leak Testing
Every nozzle is also stringently examined for leaks by applying 24-bar strain for 1 hour and making certain no water has escaped. It is rare for any leaks on the production line, but this is a particularly important stage of the testing as leaks could happen if dust is trapped within the seal face.
Activation Testing
On a month-to-month basis, random nozzles are also tested for activation by putting the nozzle on a pressure jig at various pressures and applying heat to the bulbs. The nozzles should all activate cleanly across the whole pressure vary specified to that nozzle.
A member of the manufacturing group uses a microscope and software to discover out the scale of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these tests aren’t just to guarantee the quality of the production line but are additionally an important a half of the LPCB Approval. These approvals allow prospects to recognise that the merchandise they’re shopping for are made to the very best potential quality standard in the region.
The drawback to this is that the Approval Testing system may be each costly and time-consuming – typically needing to be booked a quantity of months prematurely and requiring years of hard work to achieve.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global in terms of both hearth 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 ready to be packaged and despatched off for installation.
Here is an example 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 used in high-pressure techniques, low-pressure water methods can use CPVC piping. This is a particular sort of fire-resistant plastic enabling quick installation. Instead of threading every pipe, a heated glue can be utilized to shortly construct massive pipe networks. These networks are approved to deal with as a lot as 12 bar pressure. เกจวัดแรงดันน้ำประปา are screwed right into a particular pipe adaptor utilizing a half-inch gasoline fitting.
An electrical control panel is fitted for the system control along with pumps and a water tank, often with a mains feed.
The system is examined, signed off and handed over to the shopper.
The ultimate product as soon as installed. This shows how we expect to see the nozzles as soon as a challenge has been accomplished.
Conclusion
As we are ready to see there are numerous levels to go from metallic to nozzle head with each nozzle taking a big effort by various professionals to finish to the accredited standard.
Not solely do water mist nozzles require multiple levels of machining and assembling, they have to also endure a string of tests to have the ability to be accredited for set up. Once put in, there are even further tests undergone, generally by third-party organisations to guarantee that the complete fireplace suppression system to lastly be handed over to the consumer.
Water mist expertise assures safety, high quality and assurance by way of the stringent testing that’s required.
With the current publication of water mist standards, notably in Britain over latest years, building builders can now be assured that the standard required for water mist methods is now at an equivalent normal to different suppression techniques.
For more data, go to www.dualmist.com
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