Introducing water mist expertise – Part 2

Water mist technology remains to be a relatively new idea in phrases of hearth suppression, yet it’s proving to be an thrilling development within the trade. As the trade evolves, so do the regulations, legal guidelines and requirements in order to improve security and allow development. These can differ largely from country to country, and even area to area.
The way in which a water mist system operates is an identical mechanism to the standard sprinkler system in that the nozzles are normally activated via a bulb which blows at a particular 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 metallic, to changing into the environment friendly water mist nozzles we see installed in lots of new projects/developments throughout much of the globe at present.
The metallic arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for many parts as it is extremely sturdy and corrosion resistant in comparability to other related metals. The physique is machined out of Brass CZ121, which arrives as massive bars of metallic that are delivered to the warehouse in 3m lengths. This is then reduce into two smaller parts able to insert into the machine. Not all water mist corporations have the ability to machine the parts they require in-house though it might possibly prove very beneficial 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 software is supplied with carbide tooling and high-pressure via coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise difficult elements. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, utterly automated – this means it can turnover an unimaginable 4,000 filters in a weekend fully unmanned.
The brass heads are also de-burred on the machine, eradicating all sharp edges before being polished and despatched for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to turn out to be rather more durable. All parts are then inspected for dimensional accuracy before the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing levels.
There are many small components of varied styles and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a complete of 13 elements 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 stages include tightening with specially tailored tools, pressing utilizing a hand-press and using a specific ‘Locktite’ formulation at some stages which is a threadlock that prevents fixings from coming loose during the operational lifetime of the product. The last stage of meeting is rigorously loading the bulb and making use of the proper load to it using a torque wrench.
The assembled nozzles are then placed on one other machine so as to be labelled and uniquely recognized utilizing a serial number. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit before they’re able to be placed via the various stages of testing.
Cull Testing
Also often recognized as bubble testing in layman’s phrases, this test is to ensure no damage has occurred to the bulb throughout meeting and is a critical test for LPCB approval. The test includes utilizing a high-powered microscope to measure the size of the bubble in each bulb earlier than inserting in warm water in order 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 before the bubble is measured as soon as once more to have the ability to guarantee it has returned to the unique dimension within a small tolerance.
Leak Testing
Every nozzle is also stringently examined for leaks by making use of 24-bar pressure for 1 hour and making certain no water has escaped. It is rare for any leaks on the production line, however this is an extremely important stage of the testing as leaks may occur if filth is trapped inside the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally tested for activation by placing the nozzle on a strain jig at varied pressures and applying heat to the bulbs. The nozzles ought to all activate cleanly throughout the whole strain range specified to that nozzle.
A member of the production group makes use of a microscope and software program to find out the scale of each bubble in the bulb.
At Dual Mist Ltd, these tests are not just to assure the standard of the production line but are also an necessary part of the LPCB Approval. These approvals enable prospects to recognise that the products they are buying are made to the highest possible quality standard within the region.
The drawback to that is that the Approval Testing system could be each pricey and time-consuming – generally needing to be booked a quantity of months prematurely and requiring years of onerous work to attain.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global when it comes to both fireplace testing and component/type approval.
Tamper proofing
In order to ensure that no person is tempted to intrude 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 set up.
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.
Rather than having to use the heavy and labour-intensive metallic pipes often utilized in high-pressure techniques, low-pressure water systems can use CPVC piping. This is a special sort of fire-resistant plastic enabling quick installation. Instead of threading every pipe, a heated glue can be used to quickly construct large pipe networks. pressure gauge ราคา are permitted to deal with as much as 12 bar strain. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gasoline fitting.
An electrical management panel is fitted for the system control together with pumps and a water tank, usually with a mains feed.
The system is examined, signed off and handed over to the consumer.
The final product once installed. This reveals how we count on to see the nozzles as quickly as a challenge has been completed.
As we can see there are lots of phases to go from steel to nozzle head with every nozzle taking a major effort by various professionals to complete to the permitted commonplace.
Not solely do water mist nozzles require multiple levels of machining and assembling, they have to additionally undergo a string of checks in order to be approved for installation. Once put in, there are even further checks undergone, sometimes by third-party organisations in order for the entire fireplace suppression system to finally be handed over to the client.
Water mist technology assures safety, high quality and assurance by way of the stringent testing that is required.
With the current publication of water mist requirements, particularly in Britain over latest years, constructing developers can now be assured that the standard required for water mist methods is now at an equivalent normal to other suppression methods.
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