Water mist know-how is still a comparatively new concept when it comes to fire suppression, but it’s proving to be an thrilling improvement within the trade. As the trade evolves, so do the rules, laws and requirements so as to enhance safety and allow development. These can range largely from nation to country, and even region to area.
The method by which a water mist system operates is an identical mechanism to the traditional sprinkler system in that the nozzles are usually activated by way of a bulb which blows at a specific temperature permitting 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 big ‘bar’ of metallic, to becoming the environment friendly water mist nozzles we see installed in plenty of new projects/developments across a lot of the globe today.
The steel arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for lots of elements as this can be very durable and corrosion resistant compared to different comparable metals. The physique is machined out of Brass CZ121, which arrives as giant bars of metallic which are delivered to the warehouse in 3m lengths. This is then minimize into two smaller parts ready to insert into the machine. เกจวัดแรงดัน10bar have the flexibility to machine the parts they require in-house though it could show very helpful for value and production functions as we’re about to see.
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is provided with carbide tooling and high-pressure via coolant methods, 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 elements.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in fifty one seconds, completely automated – this means it could possibly turnover an unimaginable 4,000 filters in a weekend utterly unmanned.
เกจวัดแรงดันแก๊สอาร์กอน are additionally de-burred on the machine, removing all sharp edges before being polished and despatched for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to become rather 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 phases.
There are many small elements of various shapes and sizes 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 parts are then meticulously put collectively and assembled by the manufacturing staff requiring a fair quantity of labour earlier than the ultimate product is achieved. Various levels embrace tightening with specially adapted instruments, pressing using a hand-press and utilizing a selected ‘Locktite’ formula at some stages which is a threadlock that forestalls fixings from coming unfastened during the operational lifetime of the product. The final stage of meeting is rigorously 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 identified using a serial number. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit before they are ready to be positioned via the various phases of testing.
Cull Testing
Also generally identified as bubble testing in layman’s terms, this take a look at is to make sure no harm has occurred to the bulb during assembly and is a crucial check for LPCB approval. The check involves utilizing a high-powered microscope to measure the scale of the bubble in each bulb before inserting in warm water so as to shrink the dimensions 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 as soon as again so as to guarantee it has returned to the original measurement within a small tolerance.
Leak Testing
Every nozzle can also be stringently tested for leaks by making use of 24-bar pressure for 1 hour and making certain no water has escaped. It is uncommon for any leaks on the manufacturing line, however this is an especially very important stage of the testing as leaks could happen if dirt is trapped within the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally tested for activation by placing the nozzle on a pressure jig at numerous pressures and applying warmth to the bulbs. The nozzles ought to all activate cleanly throughout the entire stress range specified to that nozzle.
A member of the production group makes use of a microscope and software to determine the scale of every bubble in the bulb.
At Dual Mist Ltd, these checks are not just to assure the standard of the production line however are additionally an essential part of the LPCB Approval. These approvals allow prospects to recognise that the merchandise they’re shopping for are made to the best possible quality standard in the region.
The drawback to that is that the Approval Testing system can be each pricey and time-consuming – typically needing to be booked several months prematurely and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put via their paces at BRE Global when it comes to each fire 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 strain load setting on the bulb is then subsequently mounted.
The nozzles are then able to be packaged and despatched off for set up.
Here is an example of a control panel having been installed 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 often used in high-pressure systems, low-pressure water systems can use CPVC piping. This is a particular type of fire-resistant plastic enabling quick installation. Instead of threading each pipe, a heated glue can be used to shortly build large pipe networks. These networks are permitted to handle as a lot as 12 bar pressure. The nozzles are screwed right into a special pipe adaptor using a half-inch gas becoming.
An electric control panel is fitted for the system management along with pumps and a water tank, normally with a mains feed.
The system is examined, signed off and handed over to the client.
The last product once put in. This exhibits how we anticipate to see the nozzles once a project has been accomplished.
As we will see there are numerous phases to go from steel to nozzle head with every nozzle taking a significant effort by various professionals to complete to the approved commonplace.
Not only do water mist nozzles require multiple levels of machining and assembling, they must additionally bear a string of tests to have the ability to be approved for set up. Once installed, there are even further tests undergone, sometimes by third-party organisations in order for the entire fire suppression system to finally be handed over to the client.
Water mist technology assures security, high quality and assurance by way of the stringent testing that’s required.
With the latest publication of water mist standards, particularly in Britain over latest years, building developers can now be assured that the standard required for water mist systems is now at an equal standard to other suppression methods.
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