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Technical Resources

TOPIC- EFFECTS OF PUMP THRUST - DOWNTHRUST & UPTHRUST ON RELIABILITY

It's understandably a topic that concerns the operator when considering the use of a horizontal pump.

What's the real story about thrust and its effect on this type of pump system? How do I know that the thrust bearings and mechanism to cool and lubricate the system will prevent my pump from failing?

Have you asked the pump salesman or 'expert' vendor engineers, and still in the fog or not confident you got a qualified answer?

It's well known in the industry that vendors have faced a steep learning curve about the effects of thrust on catastrophic pump failure. Meanwhile, operators have suffered the financial consequences of 'thrust chamber' problems even with redundant back up pumps, - water injection facilities that go down, waterflood operations that screech to a halt, and pipelines without the boost pressure caused by a repeatedly occuring downed pump!

If you've faced one or all of these problems, you may be reluctant or very concerned when you hear your facility is considering these type of pumps.

OK, in brief - you've got to understand over the entire expected operating range of the pumps, the design thrust(both downthrust and upthrust) and how to ensure that you NEVER go into upthrust conditions outside of design range. You also need to ask smart questions to ensure that the pump system was designed properly around what you need!

So what kind of questions to ask vendors? You're wanting to get the information you need to stay out of trouble!:

• Get to the bottom of thrust bearing design. What's the L10 bearing life (in days)? May I please see the calculations for this application?

• What's the operating temperature range of the bearing lube fluid SPECIFICALLY FOR MY PUMP SYSTEM? Do you provide gauges and a fail safe alarm or means to shut down when temperature exceeds design?

• Does my design allow the pump system to go into upthust at start-up? What about line backpressure? How many seconds or minutes is the limit? Is this spelled out in the vendor start up procedure & operations manual? What kind of protection do you offer when this is exceeded?

Advance to the HorizontalPump.com™ forum, for more.
COMPARE SURFACE PUMP TYPES
  Horizontal Split Case versus ESP horizontal pump type, click here
  Reciprocating Positive Displacement PD pump versus ESP horizontal pump type, click here
  Screw Pumps vs ESP horizontal pump type, click here
  Other types not listed vs ESP horizontal pump type, click here


F.A.T.-COMMISSIONING-START UP-INSTALLATION
  Needing support? - & share know how, click here


PUMP PLANT SYSTEM DESIGN
  Parallel pumps vs single high capacity pump, click here
  Recirculation line?, click here
  Downstream Pipeline Backpressure and the HPS, click here
  kVA & Frequency (Hz) considerations, click here

HPS EQUIPMENT RESOURCE LIBRARY
  Centrifugal Pump element, click here
  Seal and Intake Section - aka Thrust Chamber, click here
  Driver - Motor, Gas or Diesel Engine, click here
  Expansion Joints, click here
  Control systems - Wonderware®/ PLC interface etc, click here
  Flange types, click here
  Variable Speed Drive & Soft Start, click here
  Transformer information, click here
  Switchboard information, click here


USER REVIEWS
  Canadian Advanced equipment, click here
  Centrilift equipment, click here
  Reda equipment, click here
  Weatherford equipment, click here
  Wood Group ESP equipment, click here
  Other Vendors' equipment, click here

OPERATING PROBLEMS
  Share your experience, click here

HORIZONTAL PUMP SYSTEM
  Pump curves, & system operating curves, click here
  Fluid analysis,-sand,H2S,CO2, temperature,etc.
  NPSH- NPSHR NPSHA, click here
  Effects of downthrust & upthrust, click here

RUNLIFE & TEARDOWN
  Pump system runlife,runtime,reliability, click here

POWER
  Topics about power and efficiency, click here

OFFSHORE PLATFORM APPLICATIONS
  Offshore pump applcations, click here

HORIZONTAL PUMP FIELD SERVICE
  Pump down? - or operating problems?, click here

SKID DESIGN, FOUNDATION SUPPORT, & GROUTING
  Relying on the vendor?, click here

NEW TECHNOLOGY -IDEAS - WHAT'S NEEDED
  Ideas to innovate , click here

EQUIPMENT SPARE PARTS
  Pump system Parts Wanted, click here
  HPS for sale, click here
  For Sale, new and used pump system parts, click here

HORIZONTAL PUMP TENDER SPECIFICATIONS
  Operator Tenders Specs, click here

HPS SYSTEM MARKET PRICING
  Click here to understand market pricing

LETTERS OF PATENT & PATENT APPLICATIONS
  Patents awarded and applied for, click here

CAREER CORNER - JOB LISTINGS
  Jobs wanted - post your Resume/CV, click here
  Employer Free Job Postings, click here

EVERYTHING ELSE & POST PHOTOS
  Post your photos, click here
  Everything else, click here

References:

  • API RP 11R (1986) Electric Submersible Pump Installation, Second Edition
  • API RP 11S (1986) Operation, Maintenance & Troubleshooting of Electric Submersible Pump Installations, Second Edition
  • API RP 11S1 (1987) Electric Submersible Pump Tear Down Report, First Edition
  • API RP 11S2 (1990) Electric Submersible Pump Testing, First Edition


    NEWS - January 2011

    Guest Moderators

    Interested in becoming a moderator on the message board? It's a professional community and we want to extend an invitation to all members.

    If you have a question or comment once you log on the board, please post it. It's designed to be interactive.

    Starting 2011, equipment suppliers may post their information and even their pricing if they wish on the board.

    In addition, if a supplier or suppliers would like to utilize the horizontal pump website separately to reach out to operators and endusers, please contact us for separate webspace for you. In other words, you may market your products and services. Thanks!





























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