Water mist technology continues to be a comparatively new idea in phrases of hearth suppression, yet it’s proving to be an exciting growth within the business. As the trade evolves, so do the regulations, laws and necessities to have the ability to improve security and allow development. These can vary largely from country to nation, and even region to region.
The means during which a water mist system operates is an identical mechanism to the traditional sprinkler system in that the nozzles are often activated by way of a bulb which blows at a particular temperature permitting 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 installed – from arriving as a big ‘bar’ of steel, to changing into the efficient water mist nozzles we see installed in lots of new projects/developments across much of the globe today.
The metallic arrives for chopping
Here at Dual Mist Ltd, Stainless Steel 304 is used for many elements as it is extremely durable and corrosion resistant compared to other similar metals. The physique is machined out of Brass CZ121, which arrives as large bars of metal which are delivered to the warehouse in 3m lengths. This is then reduce into two smaller elements able to insert into the machine. Not all water mist companies have the flexibility to machine the parts they require in-house though it could prove very beneficial for value and manufacturing purposes as we are about to see.
เกจวัดแรงดันไอน้ำ is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is provided with carbide tooling and high-pressure via coolant methods, with the twin-spindle and twin-turret making haste of the in any other case difficult elements. 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 fifty one seconds, fully automated – this means it may possibly turnover an incredible 4,000 filters in a weekend utterly unmanned.
The brass heads are also de-burred on the machine, removing all sharp edges before being polished and sent for Electroless Nickel Plating. This offers a corrosion-proof coating to the brass, enabling it to turn into rather more sturdy. All components are then inspected for dimensional accuracy earlier than the meeting stage.
This Technifor Laser machine engraves each nozzle in preparation for the testing phases.
Assembly
There are many small components of various 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 parts or ‘components’. These parts are then meticulously put collectively and assembled by the production staff requiring a good quantity of labour before the final product is achieved. Various stages embody tightening with specifically tailored tools, urgent utilizing a hand-press and utilizing a selected ‘Locktite’ method at some levels which is a threadlock that stops 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 using a torque wrench.
The assembled nozzles are then placed on one other machine to have the ability to be labelled and uniquely recognized utilizing a serial number. 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 placed via the assorted phases of testing.
Testing
Cull Testing
Also often identified as bubble testing in layman’s phrases, this take a look at is to ensure no damage has occurred to the bulb during meeting and is a crucial test for LPCB approval. The check entails using a high-powered microscope to measure the scale of the bubble in every bulb before inserting in heat water to find a way to shrink the scale 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 soon as once more in order to ensure it has returned to the original dimension within a small tolerance.
Leak Testing
Every nozzle can be stringently tested for leaks by making use of 24-bar stress for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the manufacturing line, however this is a particularly important stage of the testing as leaks could happen if filth is trapped inside the seal face.
Activation Testing
On a month-to-month basis, random nozzles are also examined for activation by placing the nozzle on a pressure jig at numerous pressures and making use of warmth to the bulbs. The nozzles ought to all activate cleanly throughout the entire strain range specified to that nozzle.
A member of the manufacturing staff makes use of a microscope and software program to determine the dimensions of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these tests usually are not simply to assure the quality of the production line however are additionally an essential part of the LPCB Approval. These approvals allow customers to recognise that the merchandise they are shopping for are made to the best attainable quality commonplace in the region.
The drawback to this is that the Approval Testing system may be each pricey and time-consuming – typically needing to be booked a quantity of months prematurely and requiring years of onerous work to realize.
The nozzles produced by Dual Mist have been put through their paces at BRE Global in phrases of both fireplace testing and component/type approval.
Tamper proofing
In order to make sure that no one 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 mounted.
The nozzles are then ready to be packaged and sent off for installation.
Here is an example of a management panel having been put in in The Claridges Hotel, London, UK. This is the place the system is operated.
Installation
Rather than having to make use of the heavy and labour-intensive metallic pipes often utilized in high-pressure systems, low-pressure water techniques can use CPVC piping. This is a particular type of fire-resistant plastic enabling fast set up. Instead of threading every pipe, a heated glue can be used to quickly build giant pipe networks. These networks are approved to handle as much as 12 bar pressure. The nozzles are screwed into a particular pipe adaptor using a half-inch gas becoming.
An electric control panel is fitted for the system management along with pumps and a water tank, often with a mains feed.
The system is tested, signed off and handed over to the consumer.
The last product once installed. This reveals how we count on to see the nozzles once a project has been completed.
Conclusion
As we will see there are tons of levels to go from metallic to nozzle head with every nozzle taking a big effort by numerous professionals to complete to the approved commonplace.
Not solely do water mist nozzles require multiple levels of machining and assembling, they have to also bear a string of checks in order to be accredited for set up. Once put in, there are even additional exams undergone, typically by third-party organisations in order for the complete hearth suppression system to finally be handed over to the client.
Water mist know-how assures security, quality and assurance via the stringent testing that’s required.
With the current publication of water mist requirements, particularly in Britain over recent years, constructing developers can now be assured that the quality required for water mist systems is now at an equal commonplace to other suppression methods.
For more data, go to www.dualmist.com
Share this:
Share