Water mist know-how remains to be a comparatively new concept in terms of hearth suppression, yet it’s proving to be an thrilling growth within the business. As the trade evolves, so do the rules, legal guidelines and requirements in order to improve safety and allow improvement. These can range largely from country to country, and even region to area.
The means in which a water mist system operates is an analogous mechanism to the traditional sprinkler system in that the nozzles are normally activated through a bulb which blows at a selected temperature allowing 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 put in – from arriving as a large ‘bar’ of steel, to changing into the efficient water mist nozzles we see put in in plenty of new projects/developments throughout a lot of the globe at present.
The metal arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of parts as it is extremely durable and corrosion resistant in comparison to other similar metals. The body is machined out of Brass CZ121, which arrives as giant bars of metal which might be delivered to the warehouse in 3m lengths. This is then cut into two smaller parts able to insert into the machine. Not all water mist companies have the ability to machine the components they require in-house though it can prove very beneficial for cost and production functions as we are 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 by way of coolant systems, with the twin-spindle and twin-turret making haste of the in any other case complicated components. A Citizen M532 Sliding Head Lathe is used for the smaller elements.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in 51 seconds, completely automated – this implies it might possibly turnover an incredible four,000 filters in a weekend utterly 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 rather more sturdy. All parts are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing phases.
Assembly
There are many small components of various shapes and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a complete of thirteen parts or ‘components’. These parts are then meticulously put together and assembled by the production staff requiring a good quantity of labour before the final product is achieved. Various phases embrace tightening with specially adapted tools, urgent using a hand-press and using a specific ‘Locktite’ formulation at some phases which is a threadlock that forestalls fixings from coming free in the course of the operational lifetime of the product. The last stage of assembly is fastidiously loading the bulb and making use of the proper load to it utilizing a torque wrench.
The assembled nozzles are then positioned on one other machine so as to be labelled and uniquely recognized using a serial number. At Dual Mist Ltd this is done on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re able to be positioned through the assorted stages of testing.
Testing
Cull Testing
Also generally identified as bubble testing in layman’s phrases, this check is to ensure no damage has occurred to the bulb throughout assembly and is a crucial take a look at for LPCB approval. The check includes utilizing a high-powered microscope to measure the scale of the bubble in each bulb earlier than placing in warm water to be able to shrink the size of the bubble to nothing. Once this is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured once again in order to guarantee it has returned to the original size within a small tolerance.
Leak Testing
Every nozzle is also 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, however this is a particularly very important stage of the testing as leaks might occur if filth is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are also examined for activation by inserting the nozzle on a strain jig at varied pressures and making use of warmth to the bulbs. The nozzles ought to all activate cleanly throughout the complete strain range specified to that nozzle.
A member of the production staff uses a microscope and software to determine the scale of every bubble in the bulb.
Approvals
At Dual Mist Ltd, these tests aren’t just to guarantee the quality of the manufacturing line however are also an necessary a half of the LPCB Approval. These approvals allow customers to recognise that the merchandise they’re shopping for are made to the highest possible high quality normal within the area.
The drawback to this is that the Approval Testing system could be both pricey and time-consuming – generally needing to be booked a number of months upfront and requiring years of hard work to achieve.
The nozzles produced by Dual Mist have been put via their paces at BRE Global in terms of each fireplace testing and component/type approval.
Tamper proofing
In order to make certain that nobody 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 sent off for installation.
Here is an example of a control panel having been put in in The Claridges Hotel, London, UK. This is where the system is operated.
Installation
Rather than having to make use of the heavy and labour-intensive metal pipes usually used in high-pressure techniques, low-pressure water techniques can use CPVC piping. เกจวัดแรงดันน้ำประปาราคา is a special sort of fire-resistant plastic enabling quick installation. Instead of threading every pipe, a heated glue can be used to quickly build massive pipe networks. These networks are approved to handle as a lot as 12 bar pressure. The nozzles are screwed into a special pipe adaptor utilizing a half-inch gas becoming.
An electric control panel is fitted for the system management together with pumps and a water tank, usually with a mains feed.
The system is examined, signed off and handed over to the client.
The ultimate product once put in. This exhibits how we anticipate to see the nozzles once a project has been accomplished.
Conclusion
As we can see there are many stages to go from metal to nozzle head with every nozzle taking a big effort by numerous professionals to complete to the approved commonplace.
Not solely do water mist nozzles require a quantity of levels of machining and assembling, they must additionally endure a string of tests in order to be accredited for set up. Once put in, there are even additional exams undergone, sometimes by third-party organisations to ensure that the whole fireplace suppression system to finally be handed over to the shopper.
Water mist know-how assures safety, high quality and assurance by way of the stringent testing that is required.
With the recent publication of water mist standards, significantly in Britain over current years, constructing builders can now be assured that the quality required for water mist techniques is now at an equal commonplace to different suppression methods.
For extra info, go to www.dualmist.com
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