Introducing water mist technology – Part 2

Water mist expertise continues to be a relatively new concept in terms of fire suppression, yet it’s proving to be an exciting improvement in the trade. As the trade evolves, so do the laws, legal guidelines and necessities in order to improve security and allow growth. ร้านซ่อมเครื่องวัดความดันโลหิต can range largely from country to country, and even area to area.
เกจวัดถังแก๊ส during which a water mist system operates is a similar mechanism to the standard sprinkler system in that the nozzles are often activated by way of a bulb which blows at a selected 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 installed – from arriving as a big ‘bar’ of steel, to becoming the environment friendly water mist nozzles we see installed in many new projects/developments throughout much of the globe at present.
The metal arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for lots of components as it is extremely durable and corrosion resistant in comparison to other related metals. The physique is machined out of Brass CZ121, which arrives as massive bars of steel that are delivered to the warehouse in 3m lengths. This is then reduce into two smaller components ready to insert into the machine. Not all water mist companies have the power to machine the components they require in-house though it can show very helpful for value and production functions as we are about to see.
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is equipped with carbide tooling and high-pressure through coolant methods, 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 elements.
A Citizen L12 also makes the filters with a functionality of drilling 365 holes in 51 seconds, completely automated – this means it could possibly turnover an incredible four,000 filters in a weekend utterly unmanned.
The brass heads are additionally 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 turn out to be far more sturdy. All elements are then inspected for dimensional accuracy before the assembly stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing phases.
There are many small elements 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 components or ‘components’. These components are then meticulously put together and assembled by the manufacturing team requiring a good quantity of labour before the final product is achieved. Various phases embrace tightening with specially adapted tools, pressing utilizing a hand-press and using a specific ‘Locktite’ formulation at some phases which is a threadlock that stops fixings from coming unfastened in the course of 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 using a torque wrench.
The assembled nozzles are then placed on another machine to have the ability to be labelled and uniquely identified using a serial quantity. At Dual Mist Ltd that is carried out on a Technifor Laser Engraver fitted with a 4th axis unit earlier than they’re able to be placed through the various stages of testing.
Cull Testing
Also known as bubble testing in layman’s phrases, this test is to make sure no harm has occurred to the bulb during assembly and is a critical test for LPCB approval. The test involves utilizing a high-powered microscope to measure the dimensions of the bubble in every bulb before putting in heat water in order to shrink the size of the bubble to nothing. Once this is checked, the nozzles are then left to relaxation and return to room temperature earlier than the bubble is measured as soon as again in order to guarantee it has returned to the unique measurement within a small tolerance.
Leak Testing
Every nozzle can additionally 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, however that is a particularly very important stage of the testing as leaks could occur if filth is trapped within the seal face.
Activation Testing
On a month-to-month basis, random nozzles are additionally tested for activation by inserting the nozzle on a stress jig at various pressures and making use of heat to the bulbs. The nozzles should all activate cleanly throughout the whole pressure range specified to that nozzle.
A member of the production staff uses a microscope and software to determine the scale of each bubble in the bulb.
At Dual Mist Ltd, these tests usually are not simply to guarantee the quality of the production line however are additionally an essential part of the LPCB Approval. These approvals allow prospects to recognise that the products they’re buying are made to the very best potential quality commonplace within the area.
The disadvantage to this is that the Approval Testing system can be both expensive and time-consuming – sometimes needing to be booked a quantity of months prematurely and requiring years of hard work to attain.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global in terms of each fire 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 fixed.
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 where the system is operated.
Rather than having to use the heavy and labour-intensive metallic pipes typically utilized in high-pressure methods, low-pressure water systems can use CPVC piping. This is a special sort of fire-resistant plastic enabling fast installation. Instead of threading every pipe, a heated glue can be utilized to rapidly construct large pipe networks. These networks are approved to handle up to 12 bar strain. The nozzles are screwed right into a special pipe adaptor utilizing a half-inch gasoline fitting.
An electric control panel is fitted for the system control along with pumps and a water tank, normally with a mains feed.
The system is examined, signed off and handed over to the client.
The last product as soon as put in. This exhibits how we anticipate to see the nozzles as quickly as a challenge has been accomplished.
As we will see there are numerous stages to go from metallic to nozzle head with every nozzle taking a significant effort by various professionals to finish to the permitted normal.
Not only do water mist nozzles require multiple levels of machining and assembling, they must also bear a string of exams to find a way to be approved for set up. Once put in, there are even further checks undergone, sometimes by third-party organisations to ensure that the entire hearth suppression system to finally be handed over to the client.
Water mist expertise assures security, high quality and assurance by way of the stringent testing that is required.
With the recent publication of water mist standards, particularly in Britain over current years, constructing builders can now be assured that the quality required for water mist methods is now at an equivalent commonplace to other suppression techniques.
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