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Feature Maintenance management Proactive with pumps


Industrial centrifugal pumps are often essential elements of critical processes and it’s therefore important to ensure they run efficiently and reliably to maximise their service life and minimise downtime. Many pump breakdowns are the result of simple, needless failures, such as the loss of clamp load between two assemblies caused by a loose fastener. This can easily lead to misalignment and escalate to bearing failure


T


he use of engineering adhesives and compounds can play a signif- icant part in all stages of the pump’s life from assembly and


installation to repair, preventative maintenance and disassembly. Indeed they are increasingly saving costs not only by preventing both minor and major failure but also allowing parts to be restored to an ‘as new’ condition, avoiding scrap and replacement costs. Simple steps can be taken, using engineering adhesives and compounds, to help reduce or eliminate common failures. Let’s start with the bearing frame and housing. Many components have air space between the threads and this can lead to oil leakage especially when pressure changes.


Leak prevention The application of an anaerobic thread sealant prevents leakage through the fittings and prevents loosening, yet allows for easy disassembly with normal hand tools. As well as averting the pump running low on lubricant, this also eliminates rust and corrosion within the thread space and prevents any ingress of contaminants into the oil. Other applications include the prevention of corrosion within the gland flushing connector. Chemical resistant coatings are another means of helping to prevent


Engineering adhesives and compounds can play a significant part in all stages of a pump’s life from assebly and installation to repair, preventative maintenance and disassembly


oil loss from seepage. These are suit- able for sealing cast parts that may have porous areas created during their manufacture. By coating the interior of a bearing frame during assembly, for example, any danger of leakage is eliminated. Or if you know where the leak points are, a wicking grade thread locker is a good choice to create an effective seal. A thread locker is also suitable for


application to the outside diameter of the oil seal to fill any small air spaces that can create a leak path. This prod- uct is a proven method of preventing self-loosening and corrosion on all threaded assemblies such as frame adapter mounting bolts, pump casing bolts and gland studs. In the same way a thread locker can ensure the stability of couplings to avoid the potential of disengagement, damage or misalign-


guide, see products in action and get quick access to technical data and health and safety sheets. The site has also been optimised for use on mobile devices. This new domain provides a shop window for products available for maintenance tasks but special


The super heroes of maintenace H


focus is given to a range that Henkel has dubbed its Loctite Maintenance Heroes. Representing thread lockers is Loctite 243 designed to prevent movement, loosening, leaks and


corrosion and secure any threaded fastener against vibration and shock loads. To seal threads this core group includes Loctite 55, a single component product that is easy to apply and does not creep, shrink or block systems. Health and Safety products include anaerobic products, instant adhesives, gasketing products and heavy-duty mainte-


nance cleaners. A new addition is the Loctite SI 5980 oil resistant silicone flange sealant. It comes in a ready-to-use, pressurised can with integrated rigid nozzle that gives pinpoint control. Loctite’s two bonding products are Loctite 401, a general purpose instant adhesive for multiple substrates, and Loctite 3090, which gap fills as well as instantly bonds. The Loctite 3463, the Metal Magic Stick is suitable for the emergency sealing of tanks and pipes. Completing the


Loctite Maintenance Heroes set are the Loctite 7063 cleaner and degreaser, Loctite 8201 moisture dispersing multi- purpose oil and Loctite 8150, Henkel’s aluminium anti-seize.


Factory Equipment SEPTEMBER 2013


ment. It is also eminently suitable for preventing keyway wear by securing the key in the keyway. Anti-seize products are of course


vital to preventing corrosion and seizure. Any exposed metal parts on a pump that are not stainless steel or coated, such as power end bolts and lock nuts, are subject to rust. Similarly, dowel pins are exposed to the exterior pump environment and without protection they will seize within the bearing frame.


Liquid gasketing and retaining Cut gaskets suffer from inherent prob- lems such as relaxation, shrinkage, extrusion and breakage, all of which can lead to leaks. The simple answer is to eliminate the need for a gasket alto- gether but using a liquid gasketing adhesive instead, a move that also seals all the air space between the parts. Typical applications are between the bearing frame and adapter and the stuffing box and pump casing. Bearings are prone to fretting or


Henkel T: 01707 635000 www.loctite- maintenance.co.uk Enter 321


spinning either on their shafts or within their housing, resulting in damage, regardless of whether they have been pressed, shrink or slip fitted in place. Their life is also compro- mised if an air space exists between the bearing and shaft where rust can form. Here a retaining compound is an excel- lent choice to prevent bearing spin, corrosion and component damage.


enkel has introduced a dedicated website, www.loctite-maintenance.co.uk, for maintenance professionals. From here, the visitor can order the Loctite maintenance expert selector chart and


Rebuilding and repair Pump casing and impellers are com- monly subject to wear from abrasive slurries, solids, cavitation and chemi- cal attack. For this purpose there is a choice of metal filled compounds and wear resistant putties available to rebuild worn cutwaters, wear ring seats, impeller vane tips and other specific areas of the casing. A top coat with a brushable ceramic provides a high gloss, low friction finish to help ensure the pump runs as close as possible to its best efficiency point. Epoxies also have an important role


to play in pump component restora- tion. They are typically used to restore a worn shaft whose surface has been damaged through constant pressure and abrasion. Oil seals can also cut a groove in a shaft over time. The use of an epoxy with high compressive strength can quickly return the part to full service.


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