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PUMPS, VALVES & ACTUATORS
SEALLESS PUMPS HELP PROTECT CROPS
Zero leakage sealless pumps assure safety for crop protection manufacturing processes
eroded by growing urbanisation, the pressure to secure and maintain high quality food supplies is increasing. It is estimated that between 20 and 40% of
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the world’s food production is lost annually to weeds, insects and disease. Alongside natural cultivation methods, modern agrochemicals have an important role to play in protecting crops against depredation and optimising yields. Crop protection is not new: but the
chemistry of protection has come a long way, with the advent of synthetic pesticides, herbicides and fertilisers. In recent years there has been research into high potency solutions that are highly selective, minimising impact on non-target plants and organisms. While important, processing agrochemicals
involves the transfer of toxic active ingredients. Careful risk management is essential to protect people and the environment, preventing leaks and spillages. In fact, the industry is among the most regulated in the world, operating to high international safety standards and subject to increasingly stringent environmental legislation. Choosing the right pump is vital to build in
longevity and safety compliance. Conventional mechanical seal pumps have been used by the chemicals industry for many years. Most of these pumps incorporate some form of seepage, which is essential for the seals to operate. However, this introduces an inherent risk. Also, if the seal fails, the product being pumped could be released into the environment. By contrast, magnetic drive centrifugal
sealless pumps provide total liquid containment, offering the reassurance of a leak-free solution, with no requirement for associated mechanical seal support systems. HMD Kontro has recently supplied a sealless
chemical pump to Syngenta, a world leader in agricultural technologies and pest control products. As farmers face increasing challenges, including those caused by environmental changes such as climate and biodiversity loss, Syngenta provides solutions via sustainable agricultural breakthroughs to counter these threats. By striving for lower residues on crops and in the environment, Syngenta strengthens the wider food industry, by providing safer, healthier food for the
1 JUNE 2022 | PROCESS & CONTROL 8
ith the world population projected to rise to over eight billion by 2025 and agricultural land increasingly being
consumer. Syngenta’s
sites are carefully configured to ensure products are produced safely and effectively. To support their crop protection innovation programmes, Syngenta had been seeking to further invest in manufacturing upgrades at their facility based in Porriño, Pontevedra, Spain. As a priority, Syngenta Spain elected to
source magnetic drive sealless pump solutions that could handle high temperatures, and volatile substances such as pesticides, insecticides, herbicides, and fertilisers. With clear technical webinars supplied as
part of the introduction and installation process, HMD Kontro supplied chemical service 50 Hz CSI magnetic drive pumps, specifically CSI 65-40-200 H DB6 and CSI 80- 50-200 DB6, in 316 stainless steel material, with a close coupled configuration, and each one mounted on its own baseplate. Designed to handle Tefluthrin, a hazardous
substance and active ingredient in soil pest treatments, the CSI sealless pump range safely transfers liquids from the reactor to the storage tank, together with a constant recirculation of the chemical within the storage tank. The CSI magnetic drive sealless pump range
has been designed to deliver key operational benefits whilst ensuring compliance to ISO design and safety standards. Notable features include the use of the ZeroLoss containment shell for improved efficiency and tolerance to system upsets. The efficient hydraulics allow maximum flow
and head coverage and, in addition, the components are modular and interchangeable. With improved pump performance and reduced maintenance, the CSI delivers maximum uptime and minimum downtime, together with the ensuing cost savings. Global service teams are on hand to assist with all aspects of pump operation. With some processing applications
demanding an even higher level of protection, the latest sealless pumps also offer a solution for compliance with regulations mandated under ASME and ISO standards that call for the option of a secondary control or containment system. Syngenta chose this optional feature, together with a leakage sensor. The secondary control system comprises a
leakage restriction device located between the rotating shaft and the static coupling housing to form a secondary pressure boundary. This design provides additional safety and control beyond the primary pressure boundary of the pump. In the unlikely event of a breach of the containment shell, leakage of the process liquid to atmosphere is restricted by the secondary control seal. The leakage sensor installed within the secondary pressure area then immediately halts the pump to enable the primary pressure boundary failure to be detected and addressed, providing greater safety for operators and the environment. Increasingly attractive as a replacement or
upgrade option, sealless pumps have much to offer. With no seals to leak, no buffer systems to maintain and no supporting systems for cooling water, venting or vapour recovery, this magnetic drive pump technology offers operational and cost saving benefits. Lower end-user installation costs and simplified maintenance requirements make an effective whole-life proposition.
HMD Kontro
hmdkontro.com
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