Introducing water mist technology – Part 2

Water mist technology is still a relatively new concept when it comes to fireplace suppression, yet it is proving to be an thrilling growth within the business. As the trade evolves, so do the laws, laws and requirements to find a way to enhance safety and enable development. These can range largely from country to country, and even area to area.
The means by which a water mist system operates is a similar mechanism to the traditional sprinkler system in that the nozzles are often 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 have a look at how some water mist nozzles are produced and put in – from arriving as a large ‘bar’ of steel, to changing into the environment friendly water mist nozzles we see installed in plenty of new projects/developments across a lot of the globe right now.
The metallic arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for lots of parts as this could be very sturdy and corrosion resistant compared to other similar metals. The body is machined out of Brass CZ121, which arrives as massive bars of steel which would possibly be delivered to the warehouse in 3m lengths. This is then cut into two smaller elements ready to insert into the machine. ตัววัดแรงดันน้ำมัน have the power to machine the components they require in-house although it might possibly prove very beneficial for value and production functions as we’re about to see.
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is supplied with carbide tooling and high-pressure by way of coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case difficult elements. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in fifty one seconds, fully automated – this means it can turnover an unbelievable four,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 sent for Electroless Nickel Plating. This supplies a corrosion-proof coating to the brass, enabling it to turn out to be rather more sturdy. 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.
There are many small components of varied styles and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of thirteen parts or ‘components’. These parts are then meticulously put together and assembled by the production staff requiring a fair amount of labour before the ultimate product is achieved. Various levels embrace tightening with specifically tailored tools, urgent using a hand-press and using a particular ‘Locktite’ method at some phases which is a threadlock that prevents fixings from coming free during the operational lifetime of the product. The ultimate stage of meeting is rigorously loading the bulb and making use of the correct load to it using a torque wrench.
The assembled nozzles are then positioned on one other machine in order to be labelled and uniquely recognized using a serial number. At Dual Mist Ltd that is done on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are able to be positioned via the various phases of testing.
Cull Testing
Also often recognized as bubble testing in layman’s phrases, this check is to make sure no injury has occurred to the bulb throughout assembly and is a critical take a look at for LPCB approval. The test entails using a high-powered microscope to measure the dimensions of the bubble in every bulb before inserting in warm water in order to shrink the scale of the bubble to nothing. Once that is checked, the nozzles are then left to rest and return to room temperature earlier than the bubble is measured once again in order to ensure it has returned to the original size inside a small tolerance.
Leak Testing
Every nozzle can additionally be stringently tested for leaks by making use of 24-bar pressure for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the production line, but that is a particularly important stage of the testing as leaks might happen if dust is trapped inside the seal face.
Activation Testing
On a month-to-month basis, random nozzles are also examined for activation by placing the nozzle on a pressure jig at varied pressures and applying warmth to the bulbs. The nozzles should all activate cleanly across the whole stress vary specified to that nozzle.
A member of the manufacturing team uses a microscope and software program to determine the size of each bubble within the bulb.
At Dual Mist Ltd, these checks aren’t just to assure the standard of the production line however are also an important a half of the LPCB Approval. These approvals enable clients to recognise that the products they’re shopping for are made to the best potential high quality commonplace in the area.
The drawback to this is that the Approval Testing system can be each costly and time-consuming – sometimes needing to be booked several months upfront 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 when it comes to both hearth testing and component/type approval.
Tamper proofing
In order to make certain 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 sent off for set up.
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.
Rather than having to make use of the heavy and labour-intensive steel pipes often used in high-pressure techniques, low-pressure water methods can use CPVC piping. This is a special sort of fire-resistant plastic enabling quick set up. Instead of threading each pipe, a heated glue can be used to shortly build large pipe networks. These networks are accredited to handle as a lot as 12 bar pressure. The nozzles are screwed into a special pipe adaptor using a half-inch gas fitting.
An electric management panel is fitted for the system management along with pumps and a water tank, usually with a mains feed.
The system is examined, signed off and handed over to the client.
The final product once put in. This reveals how we anticipate to see the nozzles as quickly as a challenge has been completed.
As we can see there are lots of levels to go from metallic to nozzle head with each nozzle taking a big effort by various professionals to complete to the permitted standard.
Not solely do water mist nozzles require a quantity of phases of machining and assembling, they have to also undergo a string of tests so as to be approved for installation. Once installed, there are even additional exams undergone, sometimes by third-party organisations to guarantee that the entire fireplace suppression system to finally be handed over to the shopper.
Water mist expertise assures security, high quality and assurance through the stringent testing that’s required.
With the latest publication of water mist standards, notably in Britain over recent years, building developers can now be assured that the quality required for water mist methods is now at an equal normal to other suppression systems.
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