Water mist technology continues to be a relatively new concept by way of hearth suppression, but it’s proving to be an exciting development within the business. As the business evolves, so do the rules, legal guidelines and requirements so as to enhance safety and allow development. These can vary largely from nation to nation, and even area to region.
The method during 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 particular temperature allowing for the activation of the mist via a low-pressure water piping system.
Here we take a look at how some water mist nozzles are produced and put in – from arriving as a big ‘bar’ of metallic, to becoming the environment friendly water mist nozzles we see installed in many new projects/developments throughout much of the globe right now.
The metallic arrives for slicing
Here at Dual Mist Ltd, Stainless Steel 304 is used for many elements as this can be very durable and corrosion resistant compared to other comparable metals. The physique is machined out of Brass CZ121, which arrives as giant bars of steel which may be delivered to the warehouse in 3m lengths. This is then minimize into two smaller elements able to insert into the machine. Not all water mist companies have the ability to machine the components they require in-house although it could prove very useful for cost and manufacturing purposes as we’re about to see.
Machining
The metal is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine software is equipped with carbide tooling and high-pressure through coolant systems, with the twin-spindle and twin-turret making haste of the otherwise difficult elements. A Citizen M532 Sliding Head Lathe is used for the smaller elements.
A Citizen L12 additionally makes the filters with a functionality of drilling 365 holes in 51 seconds, utterly automated – this implies it can turnover an unbelievable four,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. nuova fima pressure gauge ราคา supplies a corrosion-proof coating to the brass, enabling it to turn into much 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 levels.
Assembly
There are many small parts of varied sizes and shapes 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 parts are then meticulously put together and assembled by the manufacturing team requiring a good quantity of labour earlier than the ultimate product is achieved. Various phases include tightening with specially tailored tools, urgent using a hand-press and utilizing a particular ‘Locktite’ method at some levels 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 rigorously loading the bulb and applying the proper load to it utilizing a torque wrench.
The assembled nozzles are then positioned on another machine in order to be labelled and uniquely identified using 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 ready to be placed by way of the various levels of testing.
Testing
Cull Testing
Also generally recognized as bubble testing in layman’s phrases, this test is to make sure no injury has occurred to the bulb throughout meeting and is a crucial check for LPCB approval. The test entails utilizing a high-powered microscope to measure the dimensions of the bubble in each bulb earlier than inserting in heat water to find a way 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 before the bubble is measured as quickly as once more so as to guarantee it has returned to the unique dimension within a small tolerance.
Leak Testing
Every nozzle can be stringently examined for leaks by applying 24-bar strain for 1 hour and making certain no water has escaped. It is uncommon for any leaks on the production line, however this is an especially very important stage of the testing as leaks may occur if dirt is trapped inside the seal face.
Activation Testing
On a month-to-month foundation, random nozzles are additionally examined for activation by placing the nozzle on a pressure jig at various pressures and making use of warmth to the bulbs. The nozzles should all activate cleanly throughout the whole strain vary specified to that nozzle.
A member of the manufacturing team makes use of a microscope and software to determine the size of every bubble within the bulb.
Approvals
At Dual Mist Ltd, these checks usually are not just to assure the quality of the production line but are additionally an important a part of the LPCB Approval. These approvals allow customers to recognise that the products they’re buying are made to the best attainable quality commonplace within the area.
The disadvantage to that is that the Approval Testing system could be both expensive and time-consuming – typically needing to be booked several months prematurely and requiring years of hard work to achieve.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global by method of each fire testing and component/type approval.
Tamper proofing
In order to guarantee that nobody is tempted to interfere 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 sent 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 metallic pipes usually utilized in high-pressure techniques, low-pressure water techniques 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 used to rapidly construct giant pipe networks. These networks are permitted to deal with up to 12 bar strain. The nozzles are screwed into a particular pipe adaptor utilizing a half-inch gas becoming.
An electrical 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 shopper.
The ultimate product as soon as installed. This reveals how we expect to see the nozzles as soon as a challenge has been accomplished.
Conclusion
As we will see there are numerous stages to go from metallic to nozzle head with each nozzle taking a major effort by various professionals to complete to the permitted standard.
Not only do water mist nozzles require multiple stages of machining and assembling, they need to additionally endure a string of tests in order to be approved for installation. Once installed, there are even additional tests undergone, typically by third-party organisations in order for the complete hearth suppression system to finally be handed over to the client.
Water mist technology assures safety, quality and assurance via the stringent testing that is required.
With the latest publication of water mist standards, particularly in Britain over recent years, building builders can now be assured that the standard required for water mist techniques is now at an equivalent standard to other suppression methods.
For extra info, go to www.dualmist.com
Share this:
Share