Introducing water mist technology – Part 2

Water mist know-how remains to be a comparatively new idea by way of hearth suppression, but it’s proving to be an exciting improvement in the business. As the industry evolves, so do the rules, laws and requirements so as to improve safety and enable development. These can vary largely from nation to nation, and even region to region.
The method by which a water mist system operates is an analogous mechanism to the normal sprinkler system in that the nozzles are normally activated through a bulb which blows at a particular 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 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 right now.
The steel arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many components as it is extremely sturdy and corrosion resistant in comparability to different comparable metals. The physique is machined out of Brass CZ121, which arrives as giant bars of steel which would possibly be delivered to the warehouse in 3m lengths. This is then reduce into two smaller elements ready to insert into the machine. Not all water mist companies have the ability to machine the elements they require in-house though it could possibly show very helpful for cost and manufacturing functions as we’re about to see.
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is equipped with carbide tooling and high-pressure through coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise sophisticated elements. 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 can turnover an unimaginable four,000 filters in a weekend utterly 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 offers a corrosion-proof coating to the brass, enabling it to turn out to be much more durable. All elements are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing levels.
There are many small elements 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 components or ‘components’. These components are then meticulously put collectively and assembled by the manufacturing team requiring a good amount of labour earlier than the final product is achieved. Various levels include tightening with specially tailored tools, pressing utilizing a hand-press and using a selected ‘Locktite’ method at some phases which is a threadlock that stops fixings from coming loose during the operational lifetime of the product. The ultimate stage of assembly is fastidiously loading the bulb and applying the proper load to it utilizing a torque wrench.
The assembled nozzles are then placed on one other machine to find a way to be labelled and uniquely recognized utilizing a serial quantity. At Dual Mist Ltd this is done on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are able to be positioned through the assorted phases of testing.
Cull Testing
Also often known as bubble testing in layman’s phrases, this test is to make sure no harm has occurred to the bulb throughout meeting and is a critical take a look at for LPCB approval. The check involves using a high-powered microscope to measure the size of the bubble in each bulb before inserting in heat water so as to shrink the scale of the bubble to nothing. Once that is checked, the nozzles are then left to relaxation and return to room temperature before the bubble is measured as soon as once more in order to guarantee it has returned to the unique measurement inside a small tolerance.
Leak Testing
Every nozzle can be stringently examined 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 this is a particularly important stage of the testing as leaks might happen if filth is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally tested for activation by putting the nozzle on a stress jig at various pressures and making use of warmth to the bulbs. The nozzles should all activate cleanly throughout the complete stress vary specified to that nozzle.
A member of the production team makes use of a microscope and software program to determine the size of every bubble in the bulb.
At Dual Mist Ltd, these exams are not simply to assure the quality of the production line but are also an essential part of the LPCB Approval. These approvals enable clients to recognise that the products they are shopping for are made to the very best attainable quality commonplace within the region.
The drawback to that is that the Approval Testing system may be both expensive and time-consuming – typically needing to be booked several months in advance and requiring years of hard work to realize.
The nozzles produced by Dual Mist have been put via their paces at BRE Global when it comes to each hearth testing and component/type approval.
Tamper proofing
In order to guarantee that nobody 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 fastened.
The nozzles are then able to be packaged and sent off for installation.
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 make use of the heavy and labour-intensive steel pipes typically utilized in high-pressure methods, low-pressure water methods can use CPVC piping. ราคาเกจวัดแรงดันลม is a special sort of fire-resistant plastic enabling quick installation. Instead of threading each pipe, a heated glue can be used to shortly build massive pipe networks. These networks are approved to deal with as much as 12 bar strain. The nozzles are screwed right into a particular pipe adaptor utilizing a half-inch gasoline becoming.
An electrical 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 client.
ที่วัดแรงดันน้ำ installed. This shows how we count on to see the nozzles as quickly as a challenge has been accomplished.
As we can see there are many stages to go from metal to nozzle head with each nozzle taking a big effort by various professionals to finish to the permitted commonplace.
Not solely do water mist nozzles require a quantity of phases of machining and assembling, they must also bear a string of exams so as to be permitted for installation. Once put in, there are even additional tests undergone, typically by third-party organisations to ensure that the whole hearth suppression system to finally be handed over to the client.
Water mist know-how assures safety, high quality and assurance by way of the stringent testing that is required.
With the current publication of water mist standards, notably in Britain over latest years, constructing developers can now be assured that the quality required for water mist systems is now at an equivalent normal to different suppression systems.
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