Water mist technology remains to be a comparatively new idea when it comes to hearth suppression, but it is proving to be an thrilling development within the industry. As the industry evolves, so do the rules, legal guidelines and necessities so as to enhance security and allow development. These can vary largely from nation to nation, and even area to area.
The means in which a water mist system operates is an analogous mechanism to the traditional sprinkler system in that the nozzles are often activated via a bulb which blows at a selected temperature allowing for the activation of the mist by way of a low-pressure water piping system.
Here we have a look at how some water mist nozzles are produced and installed – from arriving as a big ‘bar’ of steel, to changing into the efficient water mist nozzles we see put in in many new projects/developments across much of the globe at present.
The metal arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many parts as this may be very durable and corrosion resistant compared to other comparable metals. The body is machined out of Brass CZ121, which arrives as giant bars of steel which may be delivered to the warehouse in 3m lengths. http://sipandsavorhub.xyz is then cut into two smaller components ready to insert into the machine. Not all water mist corporations have the ability to machine the elements they require in-house though it can prove very helpful for price and manufacturing functions as we are 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 by way of coolant methods, with the twin-spindle and twin-turret making haste of the otherwise difficult parts. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, fully automated – this implies it can turnover an unbelievable four,000 filters in a weekend fully unmanned.
เกจวัดแก๊สlpg are also de-burred on the machine, eradicating all sharp edges earlier than being polished and sent for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn into far more durable. All components are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
Assembly
There are many small parts of assorted sizes and shapes 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 components are then meticulously put together and assembled by the production team requiring a good quantity of labour earlier than the final product is achieved. Various phases embody tightening with specifically tailored tools, urgent using a hand-press and using a particular ‘Locktite’ formulation at some levels which is a threadlock that prevents fixings from coming loose through the operational lifetime of the product. The final stage of assembly is fastidiously loading the bulb and applying the proper load to it using a torque wrench.
The assembled nozzles are then positioned on another machine in order to be labelled and uniquely identified utilizing 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 positioned by way of the assorted stages of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s terms, this take a look at is to make sure no harm has occurred to the bulb during meeting and is a crucial take a look at for LPCB approval. The test involves using a high-powered microscope to measure the dimensions of the bubble in every bulb before putting in warm water in order to shrink the dimensions of the bubble to nothing. Once that is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured as soon as again so as to guarantee it has returned to the original size inside a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by applying 24-bar pressure for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the production line, but this is an extremely very important stage of the testing as leaks might occur if dirt is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are also examined for activation by inserting the nozzle on a stress jig at varied pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly throughout the entire strain range specified to that nozzle.
A member of the manufacturing group uses a microscope and software to determine the scale of each bubble within the bulb.
Approvals
At Dual Mist Ltd, these tests are not simply to assure the quality of the production line however are also an essential part of the LPCB Approval. These approvals enable clients to recognise that the merchandise they are buying are made to the best attainable high quality standard in the region.
The disadvantage to this is that the Approval Testing system may be each costly and time-consuming – sometimes needing to be booked several 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 in phrases of each fireplace testing and component/type approval.
Tamper proofing
In order to guarantee 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 stress load setting on the bulb is then subsequently fastened.
The nozzles are then able to be packaged and despatched off for set up.
Here is an example of a management panel having been put in 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 metal pipes usually used in high-pressure techniques, low-pressure water techniques can use CPVC piping. This is a particular kind of fire-resistant plastic enabling quick set up. Instead of threading every pipe, a heated glue can be used to quickly construct massive pipe networks. These networks are approved to handle up to 12 bar stress. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gas becoming.
An electrical control panel is fitted for the system control along with pumps and a water tank, usually with a mains feed.
The system is tested, signed off and handed over to the client.
The ultimate product as soon as put in. This reveals how we anticipate to see the nozzles once a venture has been completed.
Conclusion
As we are ready to see there are many stages to go from metallic to nozzle head with each nozzle taking a major effort by numerous professionals to complete to the accredited commonplace.
Not solely do water mist nozzles require multiple stages of machining and assembling, they must also undergo a string of tests to have the ability to be permitted for set up. Once installed, there are even further tests undergone, sometimes by third-party organisations in order for the entire fire suppression system to finally be handed over to the client.
Water mist know-how assures security, high quality and assurance by way of the stringent testing that is required.
With the latest publication of water mist standards, particularly in Britain over latest years, building developers can now be assured that the quality required for water mist methods is now at an equal standard to other suppression methods.
For more data, go to www.dualmist.com
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