Water mist know-how continues to be a relatively new idea by method of hearth suppression, yet it’s proving to be an thrilling improvement in the industry. As the trade evolves, so do the laws, legal guidelines and requirements so as to improve safety and allow development. These can range largely from country to nation, and even area to area.
The means during which a water mist system operates is an identical 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 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 metallic, to changing into the environment friendly water mist nozzles we see installed in plenty of new projects/developments throughout a lot of the globe at present.
The metal arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of elements as it is extremely durable and corrosion resistant compared 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 cut into two smaller parts ready to insert into the machine. Not all water mist companies have the ability to machine the parts they require in-house although it can prove very beneficial for price and manufacturing purposes as we’re about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine tool is supplied with carbide tooling and high-pressure through coolant systems, with the twin-spindle and twin-turret making haste of the otherwise sophisticated parts. A Citizen M532 Sliding Head Lathe is used for the smaller parts.
A Citizen L12 also makes the filters with a functionality of drilling 365 holes in fifty one seconds, utterly automated – this means it could turnover an unbelievable 4,000 filters in a weekend completely unmanned.
The brass heads are additionally de-burred on the machine, removing all sharp edges earlier than being polished and sent 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 every nozzle in preparation for the testing levels.
Assembly
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 parts or ‘components’. These parts are then meticulously put collectively and assembled by the production group requiring a fair quantity of labour earlier than the final product is achieved. Various stages embrace tightening with specifically tailored tools, urgent using a hand-press and using a specific ‘Locktite’ formulation at some phases which is a threadlock that prevents fixings from coming unfastened in the course of 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 positioned on one other machine so as to be labelled and uniquely identified utilizing a serial number. At Dual Mist Ltd this is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re able to be positioned via the assorted levels of testing.
Testing
Cull Testing
Also often identified as bubble testing in layman’s phrases, 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 test includes using a high-powered microscope to measure the size of the bubble in every bulb earlier than putting in heat water so as to shrink the size of the bubble to nothing. Once that is checked, the nozzles are then left to rest and return to room temperature before the bubble is measured as quickly as once more to be able to guarantee it has returned to the original dimension within a small tolerance.
Leak Testing
Every nozzle can also be stringently tested for leaks by applying 24-bar pressure for 1 hour and making certain no water has escaped. It is uncommon for any leaks on the manufacturing line, but this is an extremely vital stage of the testing as leaks could occur if filth is trapped inside the seal face.
Activation Testing
On a monthly foundation, random nozzles are also examined for activation by putting the nozzle on a strain jig at numerous pressures and making use of heat to the bulbs. The nozzles ought to all activate cleanly throughout the complete strain range specified to that nozzle.
A member of the production group uses a microscope and software to find out the dimensions of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these exams are not just to guarantee the quality of the production line but are also an essential a half of the LPCB Approval. These approvals enable customers to recognise that the products they’re buying are made to the highest potential quality standard in the region.
The drawback to this is that the Approval Testing system could be both expensive and time-consuming – typically needing to be booked several months prematurely and requiring years of hard work to realize.
The nozzles produced by Dual Mist have been put through their paces at BRE Global by means of both fireplace testing and component/type approval.
Tamper proofing
In order to ensure that no one is tempted to intervene 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 fixed.
The nozzles are then able to be packaged and sent off for installation.
Here is an instance of a management panel having been installed in The Claridges Hotel, London, UK. This is the place the system is operated.
Installation
Rather than having to make use of the heavy and labour-intensive steel pipes typically used in high-pressure systems, low-pressure water techniques can use CPVC piping. This is a special sort of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be utilized to rapidly build giant pipe networks. These networks are approved to deal with as much as 12 bar stress. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gas becoming.
An electrical control panel is fitted for the system management along with pumps and a water tank, normally with a mains feed.
The system is tested, signed off and handed over to the client.
The ultimate product once installed. This shows how we expect to see the nozzles once a venture has been accomplished.
Conclusion
As we are able to see there are many phases to go from metallic to nozzle head with every nozzle taking a big effort by varied professionals to finish to the accredited commonplace.
Not solely do water mist nozzles require multiple stages of machining and assembling, they have to additionally endure a string of checks in order to be permitted for installation. Once installed, there are even further tests undergone, sometimes by third-party organisations to ensure that the entire fire suppression system to lastly be handed over to the client.
เกวัดแรงดันน้ำ assures safety, high quality and assurance via the stringent testing that’s required.
With the latest publication of water mist standards, significantly in Britain over latest years, building builders can now be assured that the standard required for water mist techniques is now at an equivalent normal to different suppression systems.
For more data, go to www.dualmist.com
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