Water mist expertise is still a comparatively new concept when it comes to fireplace suppression, yet it’s proving to be an thrilling growth in the business. As the business evolves, so do the regulations, laws and requirements to be able to improve security and enable development. These can range largely from country to country, and even region to region.
The means by which a water mist system operates is an identical mechanism to the normal sprinkler system in that the nozzles are normally activated via a bulb which blows at a specific temperature permitting 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 large ‘bar’ of metallic, to changing into the environment friendly water mist nozzles we see installed in many new projects/developments across a lot of the globe right now.
The steel arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of elements as this can be very durable and corrosion resistant in comparability to different related metals. The physique is machined out of Brass CZ121, which arrives as large bars of steel which would possibly be delivered to the warehouse in 3m lengths. This is then minimize into two smaller parts ready to insert into the machine. Not all water mist companies have the ability to machine the elements they require in-house though it can prove very beneficial for price and production purposes as we are about to see.
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is supplied with carbide tooling and high-pressure via coolant methods, with the twin-spindle and twin-turret making haste of the otherwise difficult components. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, completely automated – this means it could turnover an unbelievable 4,000 filters in a weekend fully unmanned.
The brass heads are also de-burred on the machine, removing 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 rather more durable. All elements are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing phases.
There are many small components of various shapes 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 production team requiring a good amount of labour earlier than the ultimate product is achieved. Various stages include tightening with specifically adapted tools, urgent using a hand-press and utilizing a particular ‘Locktite’ formula at some phases which is a threadlock that stops fixings from coming free in the course of the operational lifetime of the product. The ultimate stage of meeting is fastidiously loading the bulb and applying the right load to it using a torque wrench.
The assembled nozzles are then positioned on another machine so as to be labelled and uniquely identified using a serial number. At Dual Mist Ltd that is done on a Technifor Laser Engraver fitted with a 4th axis unit before they are able to be positioned through the various phases of testing.
Cull Testing
Also generally recognized as bubble testing in layman’s terms, this take a look at is to make sure no damage has occurred to the bulb throughout assembly and is a important test for LPCB approval. The take a look at involves using a high-powered microscope to measure the size of the bubble in each bulb earlier than inserting in warm 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 earlier than the bubble is measured once once more so as to ensure it has returned to the original measurement inside a small tolerance.
Leak Testing
Every nozzle can also be stringently tested for leaks by making use of 24-bar pressure for 1 hour and ensuring no water has escaped. It is rare for any leaks on the manufacturing line, but this is an extremely vital stage of the testing as leaks may occur 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 numerous pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly across the whole pressure vary specified to that nozzle.
A member of the manufacturing team uses a microscope and software program to discover out the dimensions of every bubble within the bulb.
At Dual Mist Ltd, these exams are not simply to guarantee the standard of the manufacturing line however are additionally an essential part of the LPCB Approval. These approvals allow clients to recognise that the products they are buying are made to the highest attainable quality normal in the area.
The disadvantage to this is that the Approval Testing system can be each costly and time-consuming – generally needing to be booked a quantity of months upfront and requiring years of exhausting work to attain.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global when it comes to each hearth testing and component/type approval.
Tamper proofing
In order to guarantee that no person is tempted to intrude with the grub screw holding the bulb, a small plastic bung is pressed into the grub screw. The pressure load setting on the bulb is then subsequently mounted.
The nozzles are then ready to be packaged and sent off for set up.
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.
Rather than having to use the heavy and labour-intensive steel pipes usually utilized in high-pressure methods, low-pressure water systems can use CPVC piping. This is a special type of fire-resistant plastic enabling fast set up. Instead of threading every pipe, a heated glue can be used to quickly construct large pipe networks. These networks are accredited to handle up to 12 bar stress. The nozzles are screwed right into a special pipe adaptor using a half-inch fuel becoming.
An electric control panel is fitted for the system management together with pumps and a water tank, usually with a mains feed.
เกจแรงดันน้ำ is tested, signed off and handed over to the consumer.
The last product once installed. This shows how we count on to see the nozzles as quickly as a project has been accomplished.
As we can see there are lots of phases to go from metal to nozzle head with every nozzle taking a significant effort by numerous professionals to finish to the approved normal.
Not only do water mist nozzles require multiple stages of machining and assembling, they want to additionally endure a string of checks in order to be permitted for set up. Once put in, there are even additional exams undergone, generally by third-party organisations to guarantee that the complete fire suppression system to finally be handed over to the consumer.
Water mist expertise assures security, high quality and assurance by way of the stringent testing that’s required.
With the current publication of water mist requirements, particularly in Britain over latest years, constructing builders can now be assured that the quality required for water mist methods is now at an equal normal to different suppression methods.
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