Choosing right pump for the bore well used for irrigation purpose.

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Hello everyone. We have a borewell 600 ft in depth, 6" diameter and casting with 50 feet. The near by farming companies  (floriculture companies) are using the submersible pump for lifting the water. I have seen that leakage of the gasket is a big trouble with these pump. My worry is to find out any alternative pump system if present but if the submersible pump is the only answer then how to detect the leakege of the gasket ? (or say how to reduce this problem as the pumps are very expensive).

Suggetions are very much welcomed THANKS.

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16 Answers

  1. i have to lift the water from bore well which was filled by mud up to the water , so i cant the lift water from submursible pump , i want know if any other pump availabe for lift water for such caes 

     

    1 Comment

    1. prashant bhikawade you are suggested to post your query as question with some more details. Click on the Green Plus Button on the right hand side of this page and ask your a question to relevant experts.  

  3. Nadia is right and as suggested by Robert. The pump only be used for which after sale arrangement and availablity of parts should be common and cheap. However, the part which needs comple de-assebling of tube well should be selcted to very durable and needs no maintenance. The casing nowadays of P.E pipe are common agaist problem of rust/ wear out .

  4. Thanks everyone for your comments and suggestions. Yes we did a aquifer performance test and after considering all ground situation the pumping company has suggested this solution to us.

  5. aquifer potential

    Well, it depends upon the number of factors importantly aquifer potential you have not given details of aquifer in which it is located, but in broader view to irrigate the field 2-5 H.P. submersible pump for 6 hrs running is suitable for your purpose.

    Regard

    Dr. R. K.Kushwaha

    Sr. Hydrogeologist

  6. William Turner

    First problem is 600 ft well needs to be at least 10-inches in diameter with steel casing.  Otherwise you will get excessive drawdown and will have a difficult time stying on the pump efficiency curve.  What is the inside diameter of the casing?  Where are you?   Second problem is there is no problem.  Many manufacturers produce suitable pumps.  But, you must know what to order.  Have you conducted aquifer performance test and step drawdown tests to determine capacity?  Is the well screened appropriately?

     

    Bill Turner 

  7. Founder/Managing Director, ATAC-I/PureWater Assoc's., Int'l.

    @Sui: Pumps are - notoriously - the most vulnerable/unreliable component of ANY water collection/movement system.  We've seen so many - including brand new - systems fail, simply because of them. A major/multinational field study, of about 3 or 4 years ago, found that some 40% of recently installed  community central water treatment/dispensing systems, were having to be abandoned by their village recipients; almost always because of poor choices of key components + overly technical designs/engineering (& failure to pre-arrange long-term maintenance).

    To avoid this common & egregious error, we consulted with a key field technician for a major int'l. company, that both produces & distributes components for such systems.  They have, we confirmed, 2 major positive advantages connected to their equipment:

    1) A high level quality control/endurance standards guarantee; 2) Worldwide parts & components  distributors, on every continent, that can quickly & reasonably provide either replacements or repairs.

    I have their catalog & contact info in my files, if this alternative is of interest to you/your group.

    I also have some directions on how it may be possible to totally avoid pumps in some applications, with an alternative system layout: Which, of course, makes both installations & long-term maintenance a much cheaper/simpler matter.

    You can contact me directly for details, % seamus_purewater@comcast.net.  Hope this is of some assistance. Regards, JSB 

  8. Sui, the National Ground Water Association represents professionals in the groundwater industry from water well system professionals who install well systems including pumps to manufacturers and suppliers of pumps. We always advise that well owners find a qualified water well system contractor to do an assessment of any particular situation, then recommend the best solution. This may involve the professional asking you more questions to determine precisely what you need. We have a service on www.wellowner.org called Contractor Lookup that mostly lists our member- or certified-professionals in the U.S., although some are listed from other countries.

  9. I don't know about your country but here in India, submersible pumps are very cheap. The expenses go up if the manufacturer advises you to purchase stainless steel impeller shaft. In such a case, you should ask the supplier to give you alternate questions (i) for the MOC he recommends (ii) one for the cheapest configuration which is cast iron FG200 impeller, bowl ; seal gland packing; EN8 shaft. Your DTW is 6' dia . Hence, it is best that you do not install pump with dia (bowl) more than 4'. Also you will be able to get a single phase pump for 4" pumps. You require your fields to be irrigated. The rate of pumping can be high or low makes no difference. Arrange for a plastic storage tank at a higher elevation then your field. The staging can very well be made of wood. It is not neccessary to have it of Concrete. Leakage is not the pump's problem. Your neighbour probably did not get quality work from his installation contractor. Ask your supplier that he should do the erection himself and make it a Lump Sum contract. Look at it this way..your aim is to have your fields irrigated and not to have a pump lying at your store. Arrange so that you pay your supplier say 60% only when he shows you that pump is working, your storage reservoir is getting filled up. If it takes 8 hours, let it take.(energy charges have to be low). If you have to irrigate by gravity once every 12 hours, let it fill slowly. If you have a technician known to you who does good work, first show him the leakage in your neighbours piping. Ask him if he can stop the leakage. If he says yes, go and meet your neighbour. He must be a worried man too as he is losing due to the leakage. Tell him that you will stop the leaks at your cost if he agrees to fill your tank once/twicw a day. Share the energy costs in proportion to what you are consuming. Good Luck!

  10. Hi Sui, My company has installed thousands of submersiable pumps in 600 depths I would suggest looking at compaines such as Goulds to supply your needs. Nick

  12. Gaskets are the problem

    The arrangement of a deep well submersible is common. With such a high lift, special treatment of gaskets is necessary. Firstly, use fiber gaskets, not rubber. Rubber under those pressures will always blow out.

    Secondly, fiber gaskets only go from the pipe bore to the inside of the bolt hole in width, and are commonly called "ring" gaskets. To ensure that these gaskets remain in place under extreme pressure, recess one of the mating flanges such that the recess is 1mm or 1/32" larger in diameter than the ring gasket, and half the gasket thickness in depth. This "captures" the ring gasket and it is impossible to blow it out.

    Problem solved!

  13. This problem is every where. In our villages we coat the rubber with a sealant which prevents it from getting eroded at the time of installation

  14. I wonder if that might have something to do with "chemical-assisted gasket degradation" as failure mechanism. The chemicals dissolved in the deep-well water may come from the fertilizer or pesticide being used in the floriculture facility. (?) If so, changing or upgrading the gasket material may be helpful.

  15. Hi, Sui: As you see, the important factor of pumps is NPSH which could be linked to the price of pump. I recommend to get in touch with pump manufacturers, such as Ebara, Torishima to seek the best solution. Isao

  16. Well dear Although the best solution can be shared once the pumps or the situation is seen at the spot but there are some logical reasons which might be ignored by the user. I hope the user have gone through the user manual which includes the maintenance kit as well as maintenance schedule. Secondly the rubber rings named Bushes or WASHER in our local language are made fo rubber and they have capacity to be perform the job at certain level i.e. once the pump starts then for 2 hours in one go or 4 hours but then one has to give a break other wise if used continuously might create expansion and it will result into leakage since the seal is been deformed due to expansion.I would say first to replace the bushes at the right time secondly don't overuse it in one go and give rest so that the rubber dont get deshaped.