Water mist expertise continues to be a relatively new idea in phrases of hearth suppression, but it is proving to be an thrilling improvement in the industry. As the industry evolves, so do the laws, legal guidelines and necessities in order to improve security and allow development. These can differ largely from nation to country, and even area to area.
The means during which a water mist system operates is an identical mechanism to the standard sprinkler system in that the nozzles are normally activated through 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 installed – from arriving as a large ‘bar’ of steel, to turning into the efficient water mist nozzles we see put in in many new projects/developments across a lot of the globe today.
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Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of parts as this may be very sturdy and corrosion resistant compared to other comparable metals. The physique is machined out of Brass CZ121, which arrives as massive bars of metal that are delivered to the warehouse in 3m lengths. This is then cut into two smaller elements able to insert into the machine. Not all water mist firms have the flexibility to machine the elements they require in-house although it may possibly prove very useful for cost and manufacturing purposes as we are about to see.
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is provided with carbide tooling and high-pressure via coolant systems, 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 components.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, fully automated – this implies it could turnover an incredible 4,000 filters in a weekend completely unmanned.
The brass heads are additionally de-burred on the machine, removing all sharp edges earlier than being polished and despatched for Electroless Nickel Plating. This supplies a corrosion-proof coating to the brass, enabling it to turn out to be far more sturdy. All elements are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
There are many small parts of varied styles 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 together and assembled by the manufacturing staff requiring a fair quantity of labour earlier than the final product is achieved. Various stages include tightening with specifically adapted instruments, urgent using a hand-press and utilizing a specific ‘Locktite’ method at some stages which is a threadlock that prevents fixings from coming loose through the operational lifetime of the product. The ultimate stage of assembly is carefully loading the bulb and making use of the proper load to it using a torque wrench.
The assembled nozzles are then placed on another machine in order to be labelled and uniquely recognized using a serial quantity. At Dual Mist Ltd that is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit before they’re ready to be placed by way of the various levels of testing.
Cull Testing
Also known as bubble testing in layman’s terms, this check is to make sure no harm has occurred to the bulb throughout meeting and is a crucial check for LPCB approval. The take a look at involves utilizing a high-powered microscope to measure the size of the bubble in each bulb before putting in warm water to be able to shrink the size of the bubble to nothing. Once this is checked, the nozzles are then left to rest and return to room temperature earlier than the bubble is measured once again to find a way to guarantee it has returned to the original size within a small tolerance.
Leak Testing
Every nozzle can be stringently examined for leaks by applying 24-bar pressure for 1 hour and ensuring no water has escaped. It is rare for any leaks on the manufacturing line, however that is an extremely important stage of the testing as leaks might happen if dirt is trapped throughout the seal face.
Activation Testing
On a monthly basis, random nozzles are additionally tested for activation by inserting 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 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 usually are not just to assure the quality of the manufacturing line but are additionally an important a part of the LPCB Approval. These approvals allow clients to recognise that the merchandise they are buying are made to the best possible quality commonplace within the area.
The drawback to that is that the Approval Testing system may be each expensive and time-consuming – sometimes needing to be booked several months prematurely and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put through their paces at BRE Global in terms of both hearth testing and component/type approval.
Tamper proofing
In order to make sure that no one is tempted to intrude 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 mounted.
The nozzles are then able to be packaged and despatched off for installation.
Here is an instance of a management 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 metallic pipes often used in high-pressure methods, low-pressure water systems can use CPVC piping. This is a particular sort of fire-resistant plastic enabling quick set up. Instead of threading every pipe, a heated glue can be used to shortly build massive pipe networks. These networks are approved to deal with up to 12 bar stress. The nozzles are screwed into a special pipe adaptor utilizing a half-inch gas fitting.
An electrical management panel is fitted for the system management 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 as soon as put in. This reveals how we anticipate to see the nozzles as soon as a challenge has been accomplished.
As we can see there are numerous levels to go from steel to nozzle head with each nozzle taking a big effort by numerous professionals to complete to the permitted commonplace.
Not solely do water mist nozzles require a number of phases of machining and assembling, they need to also undergo a string of tests to be able to be accredited for installation. Once put in, there are even further checks undergone, generally by third-party organisations to guarantee that the entire fireplace suppression system to lastly be handed over to the client.
Water mist expertise assures security, quality and assurance via the stringent testing that is required.
With the recent publication of water mist standards, particularly in Britain over recent years, building builders can now be assured that the quality required for water mist techniques is now at an equivalent commonplace to different suppression methods.
For extra information, go to www.dualmist.com
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