classic | mobile
 

Search...

SA Instrumentation & Control Buyers' Guide

Technews Industry Guide - IIoT 2018

Technews Industry Guide - Maintenance, Reliability & Asset Optimisation

 

Optimised pump ­performance
May 2018, Valves, Actuators & Pump Control


Ignoring pumps is a risk because when these components break down, or run below optimum efficiency, the whole process suffers. Manufacturing and process companies are always under cost pressure, making it vital to maximise assets and maintain uptime.

SKF has identified four different ways to optimise pump performance:

The right bearing

Bearings in centrifugal pumps support hydraulic loads imposed on the impeller, the mass of the impeller and shaft, as well as loads due to couplings and drive systems. They also keep the shaft axial and radial deflections within acceptable limits for the impeller and shaft seal. The bearings often will face high axial loads, marginal lubrication, and high operating temperatures and vibration, all while the bearings attempt to minimise friction, which, if uncontrolled, can result in power loss, excessive heat generation, increased noise or wear, and early bearing failure. So, first and foremost, evaluate bearings (types, designs and arrangements) in the context of their anticipated operating environment. Suitable bearings are available to satisfy even the most difficult conditions faced by centrifugal pumps.

Proper lubrication

Improper lubrication accounts for more than 30% of bearing failures. Good lubricants prevent metal-to-metal contact and undesired friction. The common methods for the effective lubrication of pump bearings include: grease, oil bath, oil ring, oil mist and air-oil.

Oil mist generates the least amount of friction (allowing rotational speed to be based on the bearing design instead of lubrication limitations) and creates a positive pressure within the bearing housing (fending off invasive contaminants). Regardless of lubrication method, always specify lubricant according to the demands on vertical shafts and resistance to solids, pressure, temperatures, loads and chemical attack.

Sealing the system

Bearing seals in centrifugal pumps handle four crucial tasks. They retain lubricants or liquids, exclude contaminants, separate fluids and confine pressure. The choice of seal for centrifugal pump bearings depends on the unique demands and operating conditions of the application. Keep in mind, though, that the bearing and sealing arrangement represent an integrated system. Dynamic radial seals generally are the best choice for centrifugal pumps. These seals create the barrier between surfaces in relative motion. Seal selection ultimately must be based on a thorough review of application parameters and environmental factors.

Particularly in pump applications, for example, seals will be exposed to relatively constant pressure differentials, making pressure seals (in which the seal cavity is pressurised) the preferred choice. Seals usually provide a much shorter life than the components they protect so don’t fall into the common habit of scheduling seal replacement only at intervals dictated by requirements of other components such as bearings.

Monitoring pump health

Regular measurement and analysis of key physical parameters, such as vibration and temperature, can detect pump system problems before they occur. Basic instruments can assess and report on vibration, temperature and other parameters. More advanced tools include online surveillance systems and software that can deliver real-time data. Many problems will manifest as vibration, which is widely considered the best operating parameter to judge pump train condition. Vibration can detect problems such as imbalance, misalignment, bearing oil-film instabilities, rolling bearing degradation, mechanical looseness, structural resonance and a soft foundation. Vibration measurements are quick and fairly non-intrusive because pump equipment remains undisturbed.

Operators can also play a pivotal part in proactive maintenance strategies by serving as the ‘eyes and ears’ to detect equipment faults before problems escalate and performing basic maintenance activities.

For more information contact Samantha Joubert, SKF South Africa, +27 (0)11 821 3500, samantha.joubert@skf.com, www.skf.co.za


Credit(s)
Supplied By: SKF South Africa
Tel: +27 11 821 3500
Fax: +27 11 821 3505
Email: samantha.joubert@skf.com
www: www.skf.co.za
Share via email     Share via LinkedIn   Print this page

Further reading:

  • SKF digital tachometer provides accuracy and versatility
    January 2019, SKF South Africa, Maintenance, Test & Measurement, Calibration
    The SKF TKRT 10 is a fast and accurate tachometer utilising laser or contact to measure rotational and linear speeds. Equipped with a laser and a range of contact adaptors, it is a versatile instrument ...
  • Personalised, portable content with SKF Shelf app
    January 2019, SKF South Africa, IT in Manufacturing
    Digitalisation is changing industries and opening up new possibilities. We now have a wealth of information from a multitude of sources at our fingertips. But is it reliable? Having fast access to a trustworthy ...
  • SKF ups the digital ante at ­Göteborg plant
    November 2018, SKF South Africa, IT in Manufacturing
    Swedish group, SKF, has been implementing digital transformation since 2015, investing close to €19 million to carry out its digital revolution at the Göteborg plant which has, for over a century, been ...
  • Paving the way to a digital future
    October 2018, SKF South Africa, Maintenance, Test & Measurement, Calibration
    Growing expertise Digitalisation will affect all parts of the value chain, from design and manufacturing through to purchasing and maintenance. SKF has been monitoring equipment remotely for around ...
  • SKF provides technical acumen as sponsor of the 2018 Sasol Solar Challenge
    October 2018, SKF South Africa, News
    SKF was a proud sponsor of the 2018 Sasol Solar Challenge (SSC). The eight-day solar journey kicked off in Pretoria on 22 September, finished in Stellenbosch on 29 September. This biennial competition ...
  • Control of abrasive slurries
    October 2018, Bearing Man Group t/a BMG, Valves, Actuators & Pump Control
    BMG’s range of industrial slurry valves, which are designed to cope efficiently in harsh mining conditions, includes robust butterfly and knife gate valves, as well as diaphragm and pinch valves. “These ...
  • Schubert & Salzer stabilises paper production
    October 2018, Macsteel Fluid Control, Valves, Actuators & Pump Control
    The Austrian company, Grünewald Paper, recently modernised its process control to improve profitability. Thanks to a new control system and a grammage-weight control valve, the company’s throughput and ...
  • SKF and Siemens to improve railway reliability
    October 2018, SKF South Africa, Maintenance, Test & Measurement, Calibration
    SKF and Siemens have signed a partnership agreement that will focus on improving train operators’ asset management efficiencies. The partnership will see the implementation of SKF’s Insight Rail condition ...
  • SKF thermal camera simplifies machine inspection
    October 2018, SKF South Africa, Maintenance, Test & Measurement, Calibration
    Maintenance technicians and experienced thermographers can quickly detect troublesome hotspots with the user-friendly SKF TKTI 21 thermal camera. With a detector of 160 x 120 pixels and a visual camera, ...
  • SKF offers new Lincoln lubrication pinion
    October 2018, SKF South Africa, Motion Control & Drives
    SKF has announced the introduction of its Lincoln lubrication pinion LP2 for open gear wheels and gear racks. Complementing SKF’s existing lubrication pinion line, the reliable LP2 features a modular ...
  • SKF Endoscopes – fast and easy inspection with video function
    September 2018, SKF South Africa, Maintenance, Test & Measurement, Calibration
    The SKF Endoscope TKES 10 series are first line inspection tools that can be used for internal inspection of machinery. They help minimise the need to disassemble machinery for inspection, saving time ...
  • Quarter-turn actuator for dosing ­applications
    August 2018, Festo, Valves, Actuators & Pump Control
    Thanks to its versatility and flexibility, Festo’s quarter-turn actuator DFPD can be used in a variety of applications. Its modern, simple and compact design impresses whether it is used with ball valves, ...

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual





 

         
    classic | mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.