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As you've already identified there lots of things to monitor and protect pumps... Our preference is always power monitoring (true power) so that as soon as process upset happens for whatever reason, then immediately the power will change and once limits are set to within the minimum and maximum...

If it is in recycle, how is the pumps being controlled and ensure it is sitting on its curve ? We OFTEN get called to check pumps out to find that the recycle line has no restriction or orifice to make sure it is on its curve, being a recycle line too very rarely is there a pressure gauge to...

Littleinch has answered perfectly. Only suggestion is make it a permanent 'non tamper' solution such as impeller trims... If the worst ever happens and you need to use the pumps in anger, there is every chance settings could 'be changed' to assist in fire fighting, but implications could be...

Have you taken into account Eddy Current losses through a canned motor ? With seal less pumps you loose quite a lot through this (passing magnetic fields through the shroud/isolation shell) I read that the motor power is 2.2kw - if you were to look at a similar magnetic drive pump that we...

I would question the statement of higher cost for MDP compatred to API Shashanturbomachine, we supply them often and a simple power monitor is used to protect the pump when the tanker empties out. It is extremely unlikely for Sulphuric acid to have solids present as it is supplied clean from...

A vortex breaker can certainly help especially at such high flowrates, i remember doing a cooling tower project many years ago at a previous company when i was an apprentice and installed for trial, a side on plank of wood - made things much better and followed on with a 'more engineered and...

Two questions here: 1) Why do you need API specification for such an application, our standard PFA lined pumps do this type of application every day and question the need for API ratings ? 2) Question the material you are considering here also - if you drop the concentration down by only a...

It is incredible how many people, as mentioned in an earlier post, STILL add 'cover my arse' margins... The amount of pumps we get called to where pumps are nowhere near operating on the curve is astounding and more worryingly the amount of people running plants who don't understand pumps and...

As stated, ATEX/hazardous area submersible pumps are common in the marketplace (subject to material requirements of course) and would tend to be more expensive long term (in my opinion). We have made vertical pumps to 5 metres long with intermediate bearings and either product or clean water...

The close coupled pump is generally the cheaper way to manufacture a pump and an ideal solution fro lots of applications, however (always a however...) because it is a common shaft between pump and motor you rely on the motor bearings to accept the hydraulic thrust caused, especially, by end of...

Not exactly clear of your question, but to add some information for you... Finger in the air, a single stage end suction pump needs a minimum flow mainly to avoid heat generation in the pump head, rule of thumb is 10% of flow ab Best Efficiency point for intermittent duty, or we recommend 20%...

Its an ideal application for a Polypropylene lined magnetic drive pump that we manufacture, PP is fine up to 60'C or we can go PVDF and/or ETFE and PFA - not going to turn this post into a sales pitch however, so... If we can be of assistance, please do get in touch mentioning this post on...

Its pointing more and more that your pulling too much power from the pump - pump is working towards end of curve so well worth checking actual flow and pressure being produced against the performance curve, that then will indicate if your pulling too much power and in turn pulling a high...

Close coupled advantages - space saving, eliminated baseplate/coupling alignment issues, cheaper to purchase Close coupled disadvantages - have to remove pump and motor to perform maintenance, often have assembly/disassembly problems due to corrosion, some designs put hydraulic loads onto motor...

We run quarterly centrifugal pump training courses to discuss these very issues, excess margin, pumps running beyond BEP, effects on power increase, effects on reduced reliability, effects on the poor mechanical seal manufacturers (its hardly ever their seals that are bad, it is the operation...

Generally speaking (for small overhung Impeller pumps) we generally use the formula of: 10% of rated flow at BEP for intermittent duties 20% of rated flow at BEP for continuous duties A lot of our kit is magnetic drive which adds to heat generation in the pump/magnet assembly (through eddy...

That sounds like a very good voice of experience there Mike, absolutely correct, dont get me wrong, if you were really brave (and stupid !) there would be all kinds of things you would REALLY like to say sometimes... But your post made me chuckle to myself - commercial suicide !! Ash Fenn...

Thanks for the replies people, bimr has hit the nail on the head - making such a recommendation about an inferior material is a real problem for us, and compromises our Engineering advice, but the other problem is that many of our competitors put such inferior material into such applications all...

Just a quick survey of peoples thinking: Pumping low concentration Sodium Hypochlorite at ambient temperatures, the material corrosion charts shows Polypropylene to be quite suitable, however, long term you get lots of brittleness at sharp corners in components such as pump casings etc. Our...

We do quite a lot of business with our mag drives on formaldehyde duties, the solids content is better on mag drive than canned motors as lubrication routes are quite critical, while i say better on mag drives, there are still of course limits to be aware of and various protection devices to...