Water mist know-how remains to be a comparatively new idea when it comes to fire suppression, but it is proving to be an exciting development in the trade. As the business evolves, so do the laws, laws and requirements so as to enhance safety and allow growth. These can vary largely from country to country, and even area to area.
The method by which a water mist system operates is an analogous mechanism to the normal sprinkler system in that the nozzles are usually activated through a bulb which blows at a specific temperature allowing 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 metal, to changing into the efficient water mist nozzles we see installed in many new projects/developments across a lot of the globe right now.
The steel arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for many elements as this can be very sturdy and corrosion resistant in comparison to different comparable metals. The physique is machined out of Brass CZ121, which arrives as giant bars of steel which may 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 firms have the power to machine the parts they require in-house though it might possibly show very useful for price and production functions as we are about to see.
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is equipped with carbide tooling and high-pressure through coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case complicated parts. 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 fifty one seconds, fully automated – this means it could turnover an incredible four,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 sent for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn into much more sturdy. All parts are then inspected for dimensional accuracy earlier than the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
There are many small components of varied sizes and shapes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of 13 elements or ‘components’. These elements are then meticulously put together and assembled by the production staff requiring a good quantity of labour earlier than the ultimate product is achieved. Various stages embody tightening with specifically tailored tools, urgent using a hand-press and utilizing a selected ‘Locktite’ method at some stages which is a threadlock that stops fixings from coming loose in the course of the operational lifetime of the product. The ultimate stage of meeting is rigorously loading the bulb and applying 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 this is done on a Technifor Laser Engraver fitted with a 4th axis unit before they’re able to be placed through the varied stages of testing.
Cull Testing
Also generally identified as bubble testing in layman’s terms, this check is to make sure no damage has occurred to the bulb during meeting and is a important take a look at for LPCB approval. The check includes utilizing a high-powered microscope to measure the scale of the bubble in every bulb before inserting in warm water so as to shrink the dimensions of the bubble to nothing. Once เกจแรงดันสูง is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured once again so as to guarantee it has returned to the original measurement inside a small tolerance.
Leak Testing
Every nozzle can additionally be stringently examined for leaks by making use of 24-bar strain for 1 hour and making certain no water has escaped. It is rare for any leaks on the production line, but that is a particularly very important stage of the testing as leaks might happen if dust is trapped within the seal face.
On a monthly foundation, random nozzles are additionally tested for activation by placing the nozzle on a stress jig at numerous pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly throughout the whole pressure vary specified to that nozzle.
A member of the manufacturing team uses a microscope and software program to discover out the scale of every bubble in the bulb.
At Dual Mist Ltd, these exams usually are not just to assure the standard of the manufacturing line but are also an essential a part of the LPCB Approval. These approvals enable clients to recognise that the merchandise they are shopping for are made to the highest attainable quality standard in the area.
The disadvantage to this is that the Approval Testing system could be both 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 by way of their paces at BRE Global in terms of both fireplace testing and component/type approval.
Tamper proofing
In order to ensure 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 fixed.
The nozzles are then able to be packaged and despatched off for set up.
Here is an example of a management panel having been installed in The Claridges Hotel, London, UK. This is the place the system is operated.
Rather than having to use the heavy and labour-intensive metallic pipes often utilized in high-pressure techniques, low-pressure water systems can use CPVC piping. This is a special type of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be used to rapidly construct large pipe networks. These networks are approved to handle up to 12 bar strain. The nozzles are screwed right into a particular pipe adaptor using a half-inch gas fitting.
An electric management panel is fitted for the system control together with pumps and a water tank, normally with a mains feed.
The system is examined, signed off and handed over to the consumer.
The ultimate product once put in. This reveals how we expect to see the nozzles as quickly as a venture has been completed.
As we will see there are numerous levels to go from metal to nozzle head with each nozzle taking a major effort by varied professionals to complete to the approved standard.
Not solely do water mist nozzles require a number of stages of machining and assembling, they must also endure a string of exams in order to be approved for set up. Once installed, there are even further exams undergone, sometimes by third-party organisations to guarantee that the whole fireplace suppression system to lastly be handed over to the consumer.
Water mist know-how assures security, quality and assurance by way of the stringent testing that is required.
With the latest publication of water mist requirements, notably in Britain over current years, constructing developers can now be assured that the standard required for water mist techniques is now at an equivalent commonplace to different suppression systems.
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