Introducing water mist expertise – Part 2

Water mist expertise continues to be a relatively new idea by means of fire suppression, yet it’s proving to be an exciting growth in the trade. As the industry evolves, so do the regulations, legal guidelines and necessities so as to enhance safety and allow growth. These can range largely from country to nation, and even area to region.
The method in which a water mist system operates is an identical mechanism to the traditional sprinkler system in that the nozzles are usually activated via a bulb which blows at a selected temperature permitting for the activation of the mist via 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 becoming the efficient water mist nozzles we see put in in lots of new projects/developments across much of the globe at present.
The metal arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many elements as it is extremely durable and corrosion resistant compared to other similar metals. The body is machined out of Brass CZ121, which arrives as giant bars of metal that are delivered to the warehouse in 3m lengths. This is then reduce into two smaller elements able to insert into the machine. Not all water mist firms have the power to machine the components they require in-house though it can prove very helpful for value 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 through coolant techniques, with the twin-spindle and twin-turret making haste of the in any other case 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, fully automated – this means it could turnover an incredible 4,000 filters in a weekend utterly unmanned.
The brass heads are also 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 into much more durable. All parts are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
There are many small components of various sizes and shapes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a total of thirteen components or ‘components’. These components are then meticulously put together and assembled by the manufacturing team requiring a good amount of labour earlier than the ultimate product is achieved. Various levels embody tightening with specially tailored tools, pressing utilizing a hand-press and utilizing a particular ‘Locktite’ method at some levels which is a threadlock that stops fixings from coming free during the operational lifetime of the product. The ultimate stage of meeting is carefully loading the bulb and making use of the proper load to it using a torque wrench.
The assembled nozzles are then positioned on one other machine to be able 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 before they’re ready to be positioned through the assorted stages of testing.
Cull Testing
Also often known as bubble testing in layman’s terms, this test is to ensure no damage has occurred to the bulb during meeting and is a crucial test for LPCB approval. The test entails using a high-powered microscope to measure the scale of the bubble in each bulb before placing in heat water to be able to shrink the size of the bubble to nothing. Once that is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured once again to have the ability to ensure it has returned to the original measurement within a small tolerance.
Leak Testing
Every nozzle can be stringently examined for leaks by applying 24-bar pressure for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the manufacturing line, but that is a particularly very important stage of the testing as leaks could happen if dirt is trapped throughout the seal face.
Activation Testing
On a month-to-month basis, random nozzles are also tested for activation by inserting the nozzle on a strain jig at various pressures and making use of heat to the bulbs. The nozzles should all activate cleanly throughout the complete stress range specified to that nozzle.
A member of the manufacturing group makes use of a microscope and software to determine the size of every bubble in the bulb.
At Dual Mist Ltd, these exams usually are not simply to assure the standard of the manufacturing line however are additionally an important part of the LPCB Approval. These approvals allow customers to recognise that the merchandise they are shopping for are made to the best potential quality commonplace within the region.
The disadvantage to that is that the Approval Testing system can be each expensive and time-consuming – generally needing to be booked a quantity 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 ensure that nobody is tempted to interfere with the grub screw holding the bulb, a small plastic bung is pressed into the grub screw. The stress load setting on the bulb is then subsequently mounted.
ที่วัดแรงดันน้ำ are then able to be packaged and despatched off for installation.
Here is an example of a control panel having been put in in The Claridges Hotel, London, UK. This is the place the system is operated.
Rather than having to make use of the heavy and labour-intensive steel pipes typically used in high-pressure methods, low-pressure water systems can use CPVC piping. This is a special type of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be used to rapidly build large pipe networks. These networks are permitted to handle up to 12 bar pressure. The nozzles are screwed into a special pipe adaptor utilizing a half-inch gas becoming.
An electric management panel is fitted for the system management along with pumps and a water tank, usually with a mains feed.
The system is examined, signed off and handed over to the shopper.
The last product as quickly as installed. This exhibits how we expect to see the nozzles once a project has been accomplished.
As we are able to see there are tons of levels to go from metallic to nozzle head with each nozzle taking a big 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 also bear a string of exams in order to be permitted for installation. Once put in, there are even additional checks undergone, sometimes by third-party organisations in order for the complete hearth suppression system to finally be handed over to the consumer.
Water mist technology assures security, quality and assurance through the stringent testing that’s required.
With the recent publication of water mist standards, particularly in Britain over current years, constructing developers can now be assured that the quality required for water mist techniques is now at an equal normal to different suppression methods.
For more data, go to
Share this:

Scroll to Top