PUMPS, VALVES & ACTUATORS
Rubber expansion joints can help
remove the pulsations generated by machinery such as pumps
swapping it for Nylon would limit elongation too. Ultimately, we discovered that DuPont Kevlar offered the ultimate reinforcement for SAFEFLEX, even if it came at an increased cost. For our SAFEFLEX design, we therefore
replaced Nylon with Kevlar. Although we did not raise the temperature ratings above 121˚C, we have succeeded in virtually eliminating temperature aging or reduction of safety factor. For any hot water run, temperature cycling can result in early failure of flexible connections that are not reinforced this way.
Flange design and the risk of pullout The flange design is also crucial in getting the design right, to reduce the risk of flange pullout. In the traditional design with a one- piece flange, the flanges are put on after the carcass is moulded, so the restraint against pullout is provided by a flexible cable. As long as this cable remains, the risk of pullout exists. The only solution to this dilemma is the
introduction of a flat steel ring that cannot pull through. However, this change in design necessitates the adoption of split flanges
instead of the traditional one-piece flanges. While this dramatically reduces the risk of
pullout, there is still room for leakage. At high pressures, the flange halves can be forced outward and the gap between them would permit leakage, when testing to reach burst pressures. The engineering solution is another change to the flange design. The hooked ends on the flanges means the two flanges interlock to prevent this spreading. This is so
effective that costly control rods or cables are not required with our SAFEFLEX connectors. There are some applications where you
cannot afford to compromise on quality and safety, thankfully, through years of engineering expertise, there’s no need to when it comes to rubber expansion joints.
Mason UK
www.mason-uk.co.uk
SOLUTIONS At Landia,
We don’t just take any old pump off the shelf that’s supposedly the ‘closest’ to your application….
We tailor it to your specific needs – for the long term.
CHOPPER PUMPS & MIXER
tel. 01948 661 200
landia.co.uk
NOVEMBER 2021 | PROCESS & CONTROL 27
SINCE 1933
LONG-LASTING PUMPS AND MIXERS
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