Point taken Pumponly & Bradshsi re side nozzles. By side nozzles I didn't necessarily mean at 9 & 3 o'clock. We were supplied 3off replacement 11.5 mW units for installation recently with delivery nozzles set at 45 deg to the horizontal to match original pipework geometry.
Most reputable OEMS will provide you with a barrel type pump with nozzles and flanges to suit your requirements. Large multistage barrel pumps for the likes of boiler feed, water injection etc are of the 'engineered' variety that is to say not mass produced so can be custom made including the...
Yes, I agree with Johnny Pellin and this is a very old problem. On smaller feed pumps in small industrial plants, carbon steel of even cast iron seems to stand up to treated feedwater providing the Ph is not below 6.5 and velocity is low. Pumps can be bought cheaply but prove expensive if they...
There are many pump related organisations that run pump fundamental courses. Even pump manufacturers can do it. I train people at the firm I work for now I am semi retired. Have a look at BPMA web site if you are in Europe. They should be able to assist.
Looks like a bad case of corrosion/erosion. The pitting could be due to grit of sand in the water. I can't see clearly the normal direction of rotation but the angle of the pitting could suggest reverse rotation. If its drinking water the Ph value should be around 7 but the corrosion suggests...
Seems a lot of money for the pump duty you are looking for. I would suggest you look on the web under pump suppliers.There are plenty in Spain including Ideal Pumps.A decent supplier will be able to visit your site and discuss the project and recommend a suitable pump and also probably quote for...
As an ammendment to my earlier message, I should have said I would also expect an outboard set of non springloaded thrust pads installed to restrict the shaft end float away from the drive end. The thrust collar keyed onto the shaft would be double sided. Total shaft float set at 0.025"/0.030"
Yes, unbelievable the stupidity of some people. Typical example of so called 'engineers' not knowing the first thing about the kit they are looking after. Nevertheless they put a lot of business our way!
I think I now have a handle on your problem.You say you have a combined drum disk design. Very popular with some US pump OEMs. This means the drum will be sized to take up most of the thrust from the impellers moving towards the driver. The drum outer dia, I presume will be about 95% of the...
Have had quite a lot of experience with balance drum and piston designs malfunctioning on multistage pumps. Firstly, does this pump have a single drum designed to take up 95% of the thrust with a tilting pad or heavy duty ball bearing to accept the remaining 5% of does the pump have a combined...
Dependant on the pressures and flow required why not go for a non metallic pump or one with an epoxy based coating on all wetted surfaces. Certainly much more cheaper than a duplex alloy.
I agree with Artisi. Sounds like the suction line is blocked giving lack of NPSHa. On the cooling tower duty I presume you have a flooded suction?? Try fitting a combined pressure / vac gauge to the pump inlet nozzle or as close as possible. Close down the pump and take a pressure reading and...
In a situation where a fire pump is continuously in operation due to poor system design or being periodically tested against a closed discharge valve, to prevent serious damage,a minimum of 12% of duty flow (at ambient temperature)should be leaked off back to inlet source to prevent serious...
I would not use a VFD on such a small installation. Desired velocity upstream should be at least 4 m/sec to prevent blockages so the faster the pump runs the better. Control the pit level with either old fashoned electrodes or better still an ultrasonic device made by Milltronics or similar...
