Water mist know-how is still a relatively new concept when it comes to fireplace suppression, yet it’s proving to be an exciting improvement within the trade. As the industry evolves, so do the laws, legal guidelines and necessities to find a way to improve security and enable growth. เพรสเชอร์เกจnuovafima can differ largely from country to nation, and even region to region.
The means in which a water mist system operates is a similar mechanism to the traditional sprinkler system in that the nozzles are usually activated by way of a bulb which blows at a particular temperature permitting 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 installed – from arriving as a big ‘bar’ of metal, to changing into the efficient water mist nozzles we see put in in many new projects/developments throughout much of the globe at present.
The metal arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for a lot of parts as this may be very sturdy and corrosion resistant compared to other related metals. The physique 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 minimize into two smaller parts able to insert into the machine. Not all water mist corporations have the ability to machine the elements they require in-house though it could prove very useful for value and production 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 through coolant techniques, 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 components.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, utterly automated – this means it might possibly 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 despatched for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn out to be much more sturdy. All components are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing levels.
Assembly
There are many small parts 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 components or ‘components’. These elements are then meticulously put collectively and assembled by the production team requiring a good quantity of labour earlier than the ultimate product is achieved. Various stages embrace tightening with specially tailored instruments, urgent utilizing a hand-press and utilizing a particular ‘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 assembly is rigorously loading the bulb and applying the right load to it using a torque wrench.
The assembled nozzles are then placed on another machine so as to be labelled and uniquely identified utilizing a serial number. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit before they’re able to be placed through the varied phases of testing.
Testing
Cull Testing
Also often known as bubble testing in layman’s phrases, this check is to make sure no harm has occurred to the bulb during assembly and is a crucial take a look at for LPCB approval. The check includes utilizing a high-powered microscope to measure the dimensions of the bubble in each bulb before inserting in heat water to find a way 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 before the bubble is measured as quickly as once more in order to ensure it has returned to the original measurement within a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by making use of 24-bar stress for 1 hour and making certain no water has escaped. It is uncommon for any leaks on the manufacturing line, however that is an extremely important stage of the testing as leaks may occur if dirt is trapped within the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally tested for activation by putting the nozzle on a stress jig at numerous pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly throughout the complete stress range specified to that nozzle.
A member of the manufacturing team uses a microscope and software program to determine the dimensions of every bubble in the bulb.
Approvals
At Dual Mist Ltd, these tests aren’t just to assure the standard of the manufacturing line but are also an important a part of the LPCB Approval. These approvals enable customers to recognise that the merchandise they’re shopping for are made to the very best possible quality standard in the region.
The disadvantage to that is that the Approval Testing system may be each expensive and time-consuming – sometimes needing to be booked a number of months upfront and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put through their paces at BRE Global by method of both fire 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 fastened.
The nozzles are then able to be packaged and sent off for set up.
Here is an instance of a control 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 metallic pipes typically utilized in high-pressure systems, low-pressure water techniques can use CPVC piping. This is a particular kind of fire-resistant plastic enabling fast installation. Instead of threading each pipe, a heated glue can be utilized to quickly construct giant pipe networks. These networks are permitted to deal with up to 12 bar stress. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gas fitting.
An electrical control panel is fitted for the system control 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 final product as soon as installed. This reveals how we anticipate to see the nozzles as quickly as a venture has been accomplished.
Conclusion
As we can see there are numerous phases to go from metallic to nozzle head with each nozzle taking a big effort by varied professionals to complete to the accredited normal.
Not only do water mist nozzles require a quantity of phases of machining and assembling, they must additionally bear a string of exams so as to be permitted for set up. Once put in, there are even additional exams undergone, typically by third-party organisations to guarantee that the complete hearth suppression system to lastly be handed over to the client.
Water mist expertise assures security, high quality and assurance through the stringent testing that is required.
With the current publication of water mist requirements, notably in Britain over recent years, constructing builders can now be assured that the quality required for water mist methods is now at an equivalent standard to different suppression techniques.
For more data, go to www.dualmist.com
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