Introducing water mist technology – Part 2

Water mist know-how continues to be a comparatively new concept in terms of fireplace suppression, but it is proving to be an thrilling development in the business. As the business evolves, so do the rules, laws and necessities in order to improve security and enable development. These can vary largely from nation to country, and even area to region.
The method by which a water mist system operates is an analogous mechanism to the standard sprinkler system in that the nozzles are often activated by way of a bulb which blows at a selected temperature permitting for the activation of the mist through a low-pressure water piping system.
Here we have a look at how some water mist nozzles are produced and put in – from arriving as a big ‘bar’ of steel, to turning into the efficient water mist nozzles we see installed in many new projects/developments throughout a lot of the globe today.
pressure gauge 10 bar for chopping

Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of elements as it is extremely sturdy and corrosion resistant compared to different comparable 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 cut into two smaller parts able to insert into the machine. Not all water mist companies have the power to machine the parts they require in-house although it may possibly prove very useful for value and manufacturing purposes 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 through coolant systems, 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 elements.
A Citizen L12 also makes the filters with a functionality of drilling 365 holes in fifty one seconds, utterly automated – this means it may possibly turnover an incredible 4,000 filters in a weekend fully unmanned.
The brass heads are also 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 much 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 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 thirteen elements or ‘components’. These parts are then meticulously put collectively and assembled by the production staff requiring a good quantity of labour earlier than the final product is achieved. Various stages embrace tightening with specifically tailored tools, pressing using a hand-press and utilizing a selected ‘Locktite’ method at some stages which is a threadlock that stops fixings from coming loose in the course of the operational lifetime of the product. The ultimate stage of meeting is carefully loading the bulb and making use of the correct load to it utilizing a torque wrench.
The assembled nozzles are then positioned on another machine to find a way to be labelled and uniquely recognized utilizing a serial quantity. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit before they are able to be positioned through the assorted levels of testing.

Cull Testing

Also known as bubble testing in layman’s phrases, this take a look at is to ensure no injury has occurred to the bulb throughout assembly and is a crucial test for LPCB approval. The test entails utilizing a high-powered microscope to measure the scale of the bubble in each bulb before placing in heat water in order to shrink the dimensions of the bubble to nothing. Once this is checked, the nozzles are then left to rest and return to room temperature before the bubble is measured once once more so as to guarantee it has returned to the original dimension inside a small tolerance.
Leak Testing

Every nozzle is also stringently tested for leaks by making use of 24-bar strain for 1 hour and guaranteeing no water has escaped. It is uncommon for any leaks on the production line, however that is an especially important stage of the testing as leaks may happen if dust is trapped throughout the seal face.
Activation Testing

On a monthly foundation, random nozzles are also examined for activation by inserting the nozzle on a stress jig at numerous pressures and applying heat to the bulbs. The nozzles should all activate cleanly throughout the entire pressure range specified to that nozzle.
A member of the production team uses a microscope and software program to determine the dimensions of each bubble in the bulb.

At Dual Mist Ltd, these exams are not just to assure the standard of the production line however are additionally an necessary part of the LPCB Approval. These approvals allow prospects to recognise that the products they are buying are made to the highest potential high quality standard in the area.
The drawback to this is that the Approval Testing system could be both costly and time-consuming – generally needing to be booked several months upfront and requiring years of onerous work to attain.
The nozzles produced by Dual Mist have been put through their paces at BRE Global in phrases of each hearth testing and component/type approval.
Tamper proofing

In order to ensure that no one 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 fixed.
pressure gauge 10 bar are then ready to be packaged and sent off for set up.
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 use the heavy and labour-intensive metal pipes typically used in high-pressure techniques, low-pressure water methods can use CPVC piping. This is a particular sort of fire-resistant plastic enabling quick installation. Instead of threading every pipe, a heated glue can be utilized to rapidly build massive pipe networks. These networks are permitted to handle up to 12 bar strain. The nozzles are screwed into a special pipe adaptor utilizing a half-inch gasoline becoming.
An electrical control 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 consumer.
The last product as soon as installed. This exhibits how we count on to see the nozzles as quickly as a project has been accomplished.

As we are ready to see there are lots of levels to go from steel to nozzle head with each nozzle taking a significant effort by various professionals to complete to the accredited normal.
Not solely do water mist nozzles require a number of stages of machining and assembling, they must additionally undergo a string of tests in order to be accredited for installation. Once put in, there are even further tests undergone, generally by third-party organisations to guarantee that the complete fire suppression system to finally be handed over to the shopper.
Water mist technology assures security, quality and assurance through the stringent testing that is required.
With the recent publication of water mist standards, particularly in Britain over latest years, constructing developers can now be assured that the standard required for water mist systems is now at an equivalent commonplace to different suppression methods.
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