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FASTENERS & SEALING


Mobile phone antennae installations signal an increase for polymeric adhesives


THE CASE FOR COLD BONDING


T


he cellular network in the USA continues to expand at an exponential rate, as the battle for who can provide the fastest and


most widespread coverage wages on. In 2010, the four biggest carriers (Verizon, T-Mobile, AT&T and Sprint) averaged a collective download speed of around 5Mbps, whereas now some networks can boast up to 200Mbps. Tis increase shows no sign of slowing and has also presented an opportunity for the deployment of polymeric solutions. Tis has been proven by one of Belzona’s US distributors (Belzona Technology Washington), which has had major success from cold-bonding mobile phone antennae mounts on to tanks and other structures. Attaching this mobile phone equipment on the top or sides of water tanks makes perfect sense. Rather than developing new sites, tanks throughout the wastewater industry represent ideal multi-purpose locations for the antennae and simultaneously facilitate faster network growth. However, many asset owners require an alternative to welding these fixtures and fittings because of the side effects associated with hot work. For instance, when welding a bracket onto a tank, the application area can heat up to in excess of 1,600°C. Tis option will almost certainly damage the tank’s internal protective lining. Terefore, to minimise the risks associated with hot work, cold-applied materials are preferable. Yet available methods - such as bolting - still necessitate perforating the metal structure and leaving the tanks susceptible to corrosion. Another option is magnets, but they are a very expensive and relatively untested option. Finally, there are solvent-free epoxy systems, which are both cold- applied and proven to support the weight of the antennae in the field. Belzona offers a range of materials that make excellent high strength structural


Ensuring better and faster signal is crucial for phone networks


adhesives for metal bonding. Te application of a Belzona adhesive produces heat equivalent to a ‘room temperature’ – up to 27°C. In comparison to welding, this eliminates the potential for heat affected zones (HAZ) and need for stress relieving. Moreover, such exotherm is perfectly safe for all tank linings.


COLD BONDING PREVAILS Since 2013, Belzona Technology Washington has worked with local engineering companies and contractors to mount cell antennae onto water


Mounting brackets bonded in place using Belzona 1111


tanks, increasing network coverage across Washington State. Directly approaching the engineers who create the detailed schematics for these installations means that the best material and optimum procedure can be specified for the application.


www.engineerlive.com 45


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