Water mist know-how remains to be a relatively new idea in terms of fireplace suppression, yet it is proving to be an thrilling development in the trade. As the industry evolves, so do the laws, laws and necessities so as to improve safety and allow development. These can range largely from country to nation, and even area to region.
The means in which a water mist system operates is a similar mechanism to the normal sprinkler system in that the nozzles are usually activated via 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 have a look at how some water mist nozzles are produced and put in – from arriving as a big ‘bar’ of metal, to becoming the environment friendly water mist nozzles we see put in in many new projects/developments throughout a lot of the globe today.
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 other related metals. The body is machined out of Brass CZ121, which arrives as large bars of metallic which are delivered to the warehouse in 3m lengths. This is then cut into two smaller elements able to insert into the machine. Not all water mist firms have the power to machine the elements they require in-house although it could prove very useful for price and manufacturing purposes as we are about to see.
เครื่องมือวัดความดันคือ is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is equipped with carbide tooling and high-pressure via coolant methods, with the twin-spindle and twin-turret making haste of the otherwise sophisticated components. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 also makes the filters with a functionality of drilling 365 holes in 51 seconds, utterly automated – this means it could turnover an unbelievable 4,000 filters in a weekend completely unmanned.
The brass heads are also de-burred on the machine, eradicating all sharp edges earlier than being polished and despatched for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to become far more durable. 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 levels.
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 total of 13 elements or ‘components’. These parts are then meticulously put together and assembled by the production group requiring a good amount of labour before the final product is achieved. Various phases embody tightening with specially tailored instruments, pressing using a hand-press and using a specific ‘Locktite’ formula at some stages which is a threadlock that prevents fixings from coming unfastened during the operational lifetime of the product. The ultimate stage of meeting is rigorously loading the bulb and applying the correct load to it using a torque wrench.
The assembled nozzles are then placed on another machine to find a way to be labelled and uniquely identified utilizing a serial quantity. At Dual Mist Ltd this is done on a Technifor Laser Engraver fitted with a 4th axis unit before they are able to be positioned through the assorted stages of testing.
Cull Testing
Also often recognized as bubble testing in layman’s terms, this take a look at is to ensure no injury has occurred to the bulb during meeting and is a important check for LPCB approval. The take a look at involves utilizing a high-powered microscope to measure the size of the bubble in every bulb before placing in warm water so as to shrink the scale 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 once once more in order to guarantee it has returned to the unique size inside a small tolerance.
Leak Testing
Every nozzle can additionally be stringently tested for leaks by applying 24-bar stress for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the manufacturing line, however that is an especially important stage of the testing as leaks may happen if dust is trapped within the seal face.
Activation Testing
On a monthly basis, random nozzles are also tested for activation by putting the nozzle on a pressure jig at numerous pressures and applying warmth to the bulbs. The nozzles should all activate cleanly throughout the complete stress range specified to that nozzle.
A member of the production group makes use of a microscope and software program to determine the scale 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 within the area.
The disadvantage to this is that the Approval Testing system may be each expensive and time-consuming – sometimes needing to be booked several 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 means of both fire 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 stress 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 put in in The Claridges Hotel, London, UK. This is where the system is operated.
Rather than having to use the heavy and labour-intensive metallic pipes usually utilized in high-pressure methods, low-pressure water techniques 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 rapidly build large pipe networks. These networks are accredited to deal with up to 12 bar pressure. The nozzles are screwed right into a special pipe adaptor using a half-inch gas fitting.
An electric control panel is fitted for the system management together with pumps and a water tank, often with a mains feed.
The system is examined, signed off and handed over to the consumer.
The ultimate product once installed. This exhibits how we count on to see the nozzles as soon as a venture has been accomplished.
As we can see there are tons of levels to go from metal to nozzle head with each nozzle taking a major effort by various professionals to finish to the accredited standard.
Not solely do water mist nozzles require multiple phases of machining and assembling, they want to also undergo a string of checks in order to be accredited for set up. Once installed, there are even further exams undergone, sometimes by third-party organisations to ensure that the entire fireplace suppression system to lastly be handed over to the client.
Water mist expertise assures security, high quality and assurance via the stringent testing that is required.
With the current publication of water mist standards, significantly 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.
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