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Non-electric pumps comply with ATEX directive
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Thermoplastic pumps for aggressive chemical flows
Vertical multistage electric pumps in SS materials
Machined from solid blocks of thermoplastic material, the NM and NMB end suction centrifugal pumps from Germany’s ASV Stübbe can be used in liquid transfer applications with highly corrosive or aggressive media.
Lowara has expanded its SV range of vertical pumps with the introduction of four new models, which have expanded the capabilities of the range so that it can now handle flow rates of up to 120 m3/h, and heads up to 330 m.
According to the manufacturers, the new machined construction technique should give the pumps a longer service life and enable them to stand up better to arduous duties in the chemical industry, biotech sector, and in pharmaceutical and semi-conductor applications. The pumps can be specified in PP, PVDF, PE and UHMW-PE plastic materials.
Depending on the end user specification, the pumps can achieve a maximum flow rate of 500 m3/h, at heads of up to 100 m. Horizontal and vertical configurations can be specified, as well as magnetic drive options and units conforming to DIN standards. An optional selfpriming eccentric rotor pump can also be selected to enable operation in low flow processes. The NM pump has a long coupled configuration as standard but can also be delivered with a bare shaft design. The NMB pump has a close-coupled design, which should eliminate the risk of any product leaks in most instances.
Like the rest of the re-designed SV range, the new SV 33, SV 46, SV 66, and SV 92 models are delivered in stainless steel construction materials. The multistage electric pump range is suitable for a wide variety of applications including water treatment, supply, boosting and distribution, in addition to HVAC, transfer, and other industrial end uses such as pumping oils
alcohols, and other product. In addition, all the materials used in the SV range comply with WRAS certification, making them suitable for use in potable water applications. According to the manufacturers, the re-designed and expanded SV pump range now features improved energy efficiency and operates at a much quieter noise level than before. The axial thrust of the liquid end has also been reduced to enable standard motors to be more easily mounted, without the need for energy-sapping intermediate devices that can adversely affect efficiency.
Bearing isolators offer protection
The NM and NMB plastic centrifugal pumps from ASV Stübbe can handle sensitive and difficult liquid flows in arduous applications.
Non-electric pumps comply with ATEX directive Spirax Sarco’s mechanical fluid pumps (MFP) and automatic pump traps (APT) utilise steam or other pressurised gases as the source of their motive power but despite this lack of an electrically driven motor the pump units have still had to comply with the EU’s ATEX directive on sparks in explosive environments due to end user demands for the certification. To attain compliance with the ATEX 94/9/EC directive, Spirax Sarco had to show that the MFP and APT units would not ignite explosive atmospheres. This has proved to be relatively simple because unlike conventional
10
www.worldpumps.com
pumps the MFP and APT units have no electrical components and there are no other components that could create a spark or cause ignition.
ProTech bearing isolators from John Crane can be deployed on most pumping systems and according to the manufacturers should ensure that there is no leakage of lubricants or contaminants, potentially enhancing the lifetime of the bearing and the reliability of the pump system.
An optional high axial movement capability is available to end users to ensure that the isolators can accommodate critical movement from horizontal and vertical shafts. The noncontacting design should prove to be robust in most general industrial applications claim the manufacturers.
Manufactured from graphiteimpregnated PTFE, a low-friction material that is resistant to chemical attack, the bearing isolator is also non-sparking and will not generate excessive heat when in operation claim the manufacturers.
The unit is delivered preassembled for what the manufacturers claim should be a simple ‘push-fit’ installation procedure. Various industry standard sizes can be specified to suit most process industry applications.
According to Rick Plummer, an engineering manager with Spirax Sarco, because the units are called pumps end users have been asking for ATEX certification so, even though it’s not strictly necessary, the company has had to go out and attain it. Typically, the MFP and APT ranges are used to ensure condensate removal and recovery in municipal, industrial or building steam systems.
John Crane’s range of ProTech bearing isolators.
WORLD PUMPS July 2004
Thermoplastic pumps for aggressive chemical flows
Vertical multistage electric pumps in SS materials
Machined from solid blocks of thermoplastic material, the NM and NMB end suction centrifugal pumps from Germany’s ASV Stübbe can be used in liquid transfer applications with highly corrosive or aggressive media.
Lowara has expanded its SV range of vertical pumps with the introduction of four new models, which have expanded the capabilities of the range so that it can now handle flow rates of up to 120 m3/h, and heads up to 330 m.
According to the manufacturers, the new machined construction technique should give the pumps a longer service life and enable them to stand up better to arduous duties in the chemical industry, biotech sector, and in pharmaceutical and semi-conductor applications. The pumps can be specified in PP, PVDF, PE and UHMW-PE plastic materials.
Depending on the end user specification, the pumps can achieve a maximum flow rate of 500 m3/h, at heads of up to 100 m. Horizontal and vertical configurations can be specified, as well as magnetic drive options and units conforming to DIN standards. An optional selfpriming eccentric rotor pump can also be selected to enable operation in low flow processes. The NM pump has a long coupled configuration as standard but can also be delivered with a bare shaft design. The NMB pump has a close-coupled design, which should eliminate the risk of any product leaks in most instances.
Like the rest of the re-designed SV range, the new SV 33, SV 46, SV 66, and SV 92 models are delivered in stainless steel construction materials. The multistage electric pump range is suitable for a wide variety of applications including water treatment, supply, boosting and distribution, in addition to HVAC, transfer, and other industrial end uses such as pumping oils
alcohols, and other product. In addition, all the materials used in the SV range comply with WRAS certification, making them suitable for use in potable water applications. According to the manufacturers, the re-designed and expanded SV pump range now features improved energy efficiency and operates at a much quieter noise level than before. The axial thrust of the liquid end has also been reduced to enable standard motors to be more easily mounted, without the need for energy-sapping intermediate devices that can adversely affect efficiency.
Bearing isolators offer protection
The NM and NMB plastic centrifugal pumps from ASV Stübbe can handle sensitive and difficult liquid flows in arduous applications.
Non-electric pumps comply with ATEX directive Spirax Sarco’s mechanical fluid pumps (MFP) and automatic pump traps (APT) utilise steam or other pressurised gases as the source of their motive power but despite this lack of an electrically driven motor the pump units have still had to comply with the EU’s ATEX directive on sparks in explosive environments due to end user demands for the certification. To attain compliance with the ATEX 94/9/EC directive, Spirax Sarco had to show that the MFP and APT units would not ignite explosive atmospheres. This has proved to be relatively simple because unlike conventional
10
www.worldpumps.com
pumps the MFP and APT units have no electrical components and there are no other components that could create a spark or cause ignition.
ProTech bearing isolators from John Crane can be deployed on most pumping systems and according to the manufacturers should ensure that there is no leakage of lubricants or contaminants, potentially enhancing the lifetime of the bearing and the reliability of the pump system.
An optional high axial movement capability is available to end users to ensure that the isolators can accommodate critical movement from horizontal and vertical shafts. The noncontacting design should prove to be robust in most general industrial applications claim the manufacturers.
Manufactured from graphiteimpregnated PTFE, a low-friction material that is resistant to chemical attack, the bearing isolator is also non-sparking and will not generate excessive heat when in operation claim the manufacturers.
The unit is delivered preassembled for what the manufacturers claim should be a simple ‘push-fit’ installation procedure. Various industry standard sizes can be specified to suit most process industry applications.
According to Rick Plummer, an engineering manager with Spirax Sarco, because the units are called pumps end users have been asking for ATEX certification so, even though it’s not strictly necessary, the company has had to go out and attain it. Typically, the MFP and APT ranges are used to ensure condensate removal and recovery in municipal, industrial or building steam systems.
John Crane’s range of ProTech bearing isolators.
WORLD PUMPS July 2004