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Introducing water mist know-how – Part 2

Water mist expertise continues to be a comparatively new idea in phrases of fireplace suppression, but it’s proving to be an thrilling growth within the trade. As the trade evolves, so do the regulations, legal guidelines and requirements to find a way to enhance safety and allow improvement. These can range largely from nation to nation, and even region 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 usually activated by way of a bulb which blows at a selected temperature allowing for the activation of the mist via 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 large ‘bar’ of metal, to turning into the efficient water mist nozzles we see put in in lots of new projects/developments across much of the globe at present.
The steel arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for so much of elements as it is extremely durable and corrosion resistant compared to other related metals. The body is machined out of Brass CZ121, which arrives as massive bars of steel which 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 companies have the power to machine the parts they require in-house though it might possibly show very beneficial for price and manufacturing functions as we are about to see.
Machining
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is provided with carbide tooling and high-pressure through coolant methods, with the twin-spindle and twin-turret making haste of the in any other case sophisticated parts. A Citizen M532 Sliding Head Lathe is used for the smaller components.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in 51 seconds, utterly automated – this means it can turnover an incredible 4,000 filters in a weekend utterly unmanned.
The brass heads are also de-burred on the machine, eradicating all sharp edges earlier than 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 parts are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing levels.
Assembly
There are many small components of various shapes and sizes that make up the nozzle – In the DM4R nozzle, (as seen on the leak-testing pic) there are a complete of thirteen components or ‘components’. These elements are then meticulously put collectively and assembled by the production staff requiring a good amount of labour earlier than the ultimate product is achieved. Various levels include tightening with specifically tailored instruments, urgent utilizing a hand-press and using a selected ‘Locktite’ method at some stages which is a threadlock that forestalls fixings from coming free in the course of the operational lifetime of the product. The ultimate stage of assembly 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 one other machine so as to be labelled and uniquely identified utilizing a serial number. At Dual Mist Ltd this is accomplished on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are ready to be placed by way of the varied phases of testing.
Testing
Cull Testing
Also often identified as bubble testing in layman’s phrases, this check is to make sure no injury has occurred to the bulb during assembly and is a important test for LPCB approval. The check involves utilizing a high-powered microscope to measure the dimensions of the bubble in each bulb earlier than inserting in warm water to be able to shrink the scale of the bubble to nothing. Once that is checked, the nozzles are then left to relaxation and return to room temperature before the bubble is measured as soon as again in order to guarantee it has returned to the original size inside a small tolerance.
Leak Testing
Every nozzle can also be stringently examined for leaks by applying 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 extremely very important stage of the testing as leaks may happen if dirt is trapped within the seal face.
Activation Testing
On a monthly foundation, random nozzles are additionally examined for activation by placing the nozzle on a strain jig at numerous pressures and applying warmth to the bulbs. The nozzles should all activate cleanly across the whole pressure range specified to that nozzle.
A member of the production staff uses a microscope and software program to determine the dimensions of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these checks are not just to assure the quality of the manufacturing line but are additionally an important a half of the LPCB Approval. These approvals allow clients to recognise that the products they’re buying are made to the very best attainable high quality normal within the area.
The disadvantage to this is that the Approval Testing system could be each expensive and time-consuming – sometimes needing to be booked a quantity of months in advance and requiring years of exhausting work to achieve.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global in phrases of both fireplace testing and component/type approval.
Tamper proofing
In order to ensure that nobody 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 installation.
Here is เกจวัดแรงดันไนโตรเจนราคา of a control panel having been installed in The Claridges Hotel, London, UK. This is where the system is operated.
Installation
Rather than having to use the heavy and labour-intensive metallic pipes often used in high-pressure techniques, low-pressure water techniques can use CPVC piping. This is a special type of fire-resistant plastic enabling fast installation. Instead of threading each pipe, a heated glue can be used to quickly construct large pipe networks. These networks are permitted to deal with up to 12 bar stress. The nozzles are screwed into a particular pipe adaptor using a half-inch gas 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 tested, signed off and handed over to the shopper.
The final product as quickly as put in. This shows how we count on to see the nozzles as soon as a project has been accomplished.
Conclusion
As we are able to see there are heaps of stages to go from steel to nozzle head with every nozzle taking a big effort by numerous professionals to complete to the approved commonplace.
Not only do water mist nozzles require a number of levels of machining and assembling, they have to also bear a string of tests to have the ability to be accredited for installation. Once put in, there are even additional checks undergone, typically by third-party organisations to ensure that the whole fire suppression system to finally be handed over to the shopper.
Water mist technology assures security, quality and assurance via the stringent testing that’s required.
With the latest publication of water mist requirements, notably in Britain over recent years, constructing developers can now be assured that the quality required for water mist methods is now at an equivalent commonplace to different suppression systems.
For extra information, go to www.dualmist.com
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