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Water mist technology is still a relatively new concept in terms of fire suppression, but it is proving to be an exciting growth within the business. As the trade evolves, so do the rules, laws and requirements so as to enhance security and allow development. เกจวัดแรงดันถังลม can range largely from nation to country, and even area to area.
The method by which a water mist system operates is a similar mechanism to the standard sprinkler system in that the nozzles are usually activated via a bulb which blows at a specific temperature permitting for the activation of the mist through 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 metal, to turning into the environment friendly water mist nozzles we see put in in many new projects/developments across much of the globe today.
The steel arrives for cutting
Here at Dual Mist Ltd, Stainless Steel 304 is used for many components as it is extremely durable and corrosion resistant compared to other comparable metals. The body 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 cut into two smaller parts able to insert into the machine. Not all water mist firms have the power to machine the components they require in-house though it could show very useful for cost and production functions as we’re about to see.
Machining
The steel is fed to a Nakamura WT150 CNC lathe. This high-performance Japanese machine device is equipped with carbide tooling and high-pressure through coolant systems, with the twin-spindle and twin-turret making haste of the otherwise complicated parts. A Citizen M532 Sliding Head Lathe is used for the smaller elements.
A Citizen L12 also makes the filters with a capability of drilling 365 holes in fifty one seconds, fully automated – this means it may possibly turnover an unimaginable four,000 filters in a weekend completely unmanned.
The brass heads are additionally de-burred on the machine, eradicating all sharp edges before being polished and despatched for Electroless Nickel Plating. This provides a corrosion-proof coating to the brass, enabling it to become rather more sturdy. All elements are then inspected for dimensional accuracy before the meeting stage.
This Technifor Laser machine engraves every nozzle in preparation for the testing levels.
Assembly
There are many small elements of assorted 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 elements or ‘components’. These components are then meticulously put collectively and assembled by the production group requiring a good quantity of labour earlier than the final product is achieved. Various stages embody tightening with specifically adapted instruments, pressing using a hand-press and using a specific ‘Locktite’ formulation at some phases which is a threadlock that prevents fixings from coming unfastened through the operational lifetime of the product. The ultimate stage of meeting is fastidiously loading the bulb and applying the proper load to it utilizing a torque wrench.
The assembled nozzles are then placed on another machine so as to be labelled and uniquely recognized using a serial quantity. At Dual Mist Ltd this is done on a Technifor Laser Engraver fitted with a 4th axis unit before they are able to be placed via the various levels of testing.
Testing
Cull Testing
Also known as bubble testing in layman’s terms, this take a look at is to make sure no harm has occurred to the bulb during meeting and is a critical test for LPCB approval. The take a look at entails utilizing a high-powered microscope to measure the scale of the bubble in each bulb before inserting in warm water in order 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 once again to find a way to ensure it has returned to the unique measurement inside a small tolerance.
Leak Testing
Every nozzle can also be stringently tested for leaks by making use of 24-bar strain for 1 hour and guaranteeing no water has escaped. It is rare for any leaks on the production 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 monthly foundation, random nozzles are additionally examined for activation by inserting the nozzle on a pressure jig at varied pressures and applying warmth to the bulbs. The nozzles ought to all activate cleanly throughout the whole strain vary specified to that nozzle.
A member of the manufacturing team uses a microscope and software program to find out the dimensions of each bubble in the bulb.
Approvals
At Dual Mist Ltd, these tests are not simply to assure the standard of the production line but are additionally an necessary part of the LPCB Approval. These approvals enable prospects to recognise that the merchandise they’re shopping for are made to the best attainable quality normal in the region.
The drawback to that is that the Approval Testing system can be both expensive and time-consuming – typically needing to be booked several months in advance and requiring years of onerous work to realize.
The nozzles produced by Dual Mist have been put by way of their paces at BRE Global in phrases of each fire 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 fixed.
The nozzles are then able to be packaged and despatched 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 use the heavy and labour-intensive steel pipes usually utilized in high-pressure methods, low-pressure water techniques can use CPVC piping. This is a special type of fire-resistant plastic enabling quick set up. Instead of threading each pipe, a heated glue can be used to shortly construct giant pipe networks. These networks are approved to handle up to 12 bar pressure. The nozzles are screwed into a particular pipe adaptor using a half-inch gas becoming.
An electrical management panel is fitted for the system control along with pumps and a water tank, often with a mains feed.
The system is examined, signed off and handed over to the shopper.
The last product as quickly as put in. This exhibits how we count on to see the nozzles as quickly as a venture has been accomplished.
Conclusion
As we will see there are many stages to go from metal to nozzle head with each nozzle taking a significant effort by various professionals to complete to the permitted commonplace.
Not solely do water mist nozzles require a number of levels of machining and assembling, they have to also bear a string of tests so as to be permitted for set up. Once installed, there are even further checks undergone, typically by third-party organisations in order for the entire hearth suppression system to finally be handed over to the client.
Water mist know-how assures security, high quality and assurance via the stringent testing that is required.
With the latest publication of water mist requirements, notably in Britain over recent years, constructing builders can now be assured that the standard required for water mist methods is now at an equal commonplace to other suppression techniques.
For extra data, go to www.dualmist.com
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