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Introducing water mist know-how – Part 2

Water mist technology remains to be a comparatively new concept by way of hearth suppression, but it’s proving to be an thrilling growth within the trade. As the industry evolves, so do the laws, laws and requirements in order to enhance safety and enable improvement. These can vary largely from country to country, and even area to area.
The means by which a water mist system operates is an identical mechanism to the standard sprinkler system in that the nozzles are normally activated by way of a bulb which blows at a particular temperature allowing for the activation of the mist by way of 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 metal, to becoming the environment friendly water mist nozzles we see put in in many new projects/developments throughout much of the globe right now.
The metal arrives for slicing
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 giant bars of metallic which are delivered to the warehouse in 3m lengths. This is then cut into two smaller elements able to insert into the machine. เกจวัดความดันน้ำ have the power to machine the components they require in-house although it could possibly prove very helpful for value and production functions as we are about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is provided with carbide tooling and high-pressure via coolant techniques, with the twin-spindle and twin-turret making haste of the otherwise complicated components. 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, completely automated – this means it could turnover an incredible 4,000 filters in a weekend fully unmanned.
The brass heads are additionally de-burred on the machine, removing all sharp edges earlier than being polished and sent for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to become far more durable. All parts are then inspected for dimensional accuracy earlier than the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing stages.
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 total of 13 parts or ‘components’. These elements are then meticulously put collectively and assembled by the manufacturing staff requiring a good amount of labour earlier than the ultimate product is achieved. Various stages embrace tightening with specifically tailored tools, pressing utilizing a hand-press and utilizing a particular ‘Locktite’ formulation at some levels which is a threadlock that forestalls fixings from coming unfastened during the operational lifetime of the product. The final stage of meeting is carefully loading the bulb and making use of the right load to it utilizing a torque wrench.
The assembled nozzles are then positioned on one other machine so as to be labelled and uniquely recognized utilizing a serial quantity. At Dual Mist Ltd this is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they are able to be positioned through the various phases of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s terms, this take a look at is to ensure no injury has occurred to the bulb throughout meeting and is a critical check for LPCB approval. The check includes using a high-powered microscope to measure the dimensions of the bubble in each bulb before inserting in warm water to find a way 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 once more in order to ensure it has returned to the unique measurement inside a small tolerance.
Leak Testing
Every nozzle is also stringently examined for leaks by applying 24-bar pressure for 1 hour and guaranteeing no water has escaped. It is uncommon for any leaks on the manufacturing line, however this is an extremely vital stage of the testing as leaks may occur if dirt is trapped within the seal face.
Activation Testing
On a monthly foundation, random nozzles are also tested for activation by placing the nozzle on a strain jig at numerous pressures and making use of heat to the bulbs. The nozzles ought to all activate cleanly across the complete stress vary specified to that nozzle.
A member of the production staff makes use of a microscope and software program to discover out the size of every bubble within the bulb.
Approvals
At Dual Mist Ltd, these tests are not just to assure the quality of the manufacturing line but are additionally an necessary part of the LPCB Approval. These approvals allow prospects to recognise that the merchandise they’re shopping for are made to the very best potential high quality standard in the region.
The disadvantage to that is that the Approval Testing system may be each expensive and time-consuming – typically needing to be booked a quantity of months prematurely and requiring years of onerous work to achieve.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global by method of each fireplace testing and component/type approval.
Tamper proofing
In order to guarantee that no person is tempted to intervene 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.
The nozzles are then ready to be packaged and despatched off for installation.
Here is an example of a management panel having been installed in The Claridges Hotel, London, UK. This is the place the system is operated.
Installation
Rather than having to use the heavy and labour-intensive metal pipes typically 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 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 right into a special pipe adaptor utilizing a half-inch gas fitting.
An electric management panel is fitted for the system control together with pumps and a water tank, often with a mains feed.
The system is tested, signed off and handed over to the client.
The last product as soon as installed. This reveals how we expect to see the nozzles as quickly as a challenge has been completed.
Conclusion
As we are ready to see there are many stages to go from metal to nozzle head with each nozzle taking a significant effort by various professionals to finish to the permitted standard.
Not only do water mist nozzles require a quantity of levels of machining and assembling, they have to also bear a string of checks in order to be permitted for installation. Once installed, there are even further exams undergone, sometimes by third-party organisations in order for the whole fireplace suppression system to lastly be handed over to the shopper.
Water mist know-how assures security, quality and assurance via the stringent testing that’s required.
With the latest publication of water mist requirements, particularly in Britain over recent years, constructing developers can now be assured that the quality required for water mist techniques is now at an equivalent normal to different suppression systems.
For more data, go to www.dualmist.com
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