Machinery Lubrication magazine published by Noria Corporation
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Machinery The machine is lubricated by one of the WSL methods described previously. nated circulation method. The column to the right estimates the importance of the benefit. For a better understanding of the benefits associated with oil circulation, they are described in greater detail below: 4. Hydraulic System — Hydraulic systems use pressurized flowing oil that enables machine movement and actuation. This is a totally flooded system, meaning frictional surfaces stay in constant contact with the circulating oil. Hydraulic and oil-feed circulation are complex systems from a design and manufacturing standpoint. However, users can add constant-level and off-line circulation to most WSL machines retroactively to gain the numerous benefits of oil circulation. Oil Level Control Many machines require controlled and constant oil levels in the sump. These include some gearboxes, bearing housings and chain lubricators. Traditionally, these machines are manually fed with makeup oil to maintain the oil level. In other cases, external devices such as constant-level oilers drip oil from bottles to control the oil level. However, these are not circulating systems but rather oil-feed systems. A constant-level oil circulation unit is shown in Figures 2 and 3. The oil not only circulates but supplies makeup oil to the machine's sump. Offline circulation systems don't have an external tank and thus cannot provide makeup fluid to control the oil level. Benefits of Constant-level and Offline Circulation As mentioned, many of the benefits of oil circulation are subtle or not easily understood. Nevertheless, they are significant in importance to machine reliability. Table 1 provides a breakdown of the advantages for using constant-level or off-line circulation when compared to conventional wet-sump lubrication alone. An "X" denotes whether the benefit applies to the desig- ADVANTAGE OVER CONVENTIONAL WET-SUMP LUBRICATION Contamination Control It is difficult to maintain oil cleanliness and dryness without onboard filtration (and separators in certain cases). Filtration requires oil CONSTANT-LEVEL CIRCULATION OFF-LINE CIRCULATION IMPORTANCE SCALE (10 BEING THE HIGHEST) Ability to continually replenish lost oil to maintain a controlled sump level, especially where constant oil level is important. X Ability to control cleanliness and dryness with filtration in the circulation loop. X Ability to circulate oil through a filter even when the machine is off. X X 3 Ability to install live-zone sampling valves. X X 8 Significantly more oil volume to reduce oil change frequency and stabilize oil properties. Also keeps oil cooler. X Ability to add a cooler or heater to the circuit if needed. X X 4 Ability to add a magnetic plug for periodic inspection. X X 4 Lower risk of sediment and free water accumulation, oil stratification and fishbowl effects (relates to problems coming from disturbed sediment). X X 6 Ability to add online oil sensors for realtime condition monitoring. X Ability to add oil to the system that is 100-percent filtered before reaching the machine sump. X Lubrication PUBLISHER Mike Ramsey - mramsey@noria.com GROUP PUBLISHER Brett O'Kelley - bretto@noria.com EDITOR-IN-CHIEF Jason Sowards - jsowards@noria.com SENIOR EDITOR Jim Fitch - jfitch@noria.com TECHNICAL WRITERS Jeremy Wright - jwright@noria.com Wes Cash - wcash@noria.com Bennett Fitch - bfitch@noria.com Loren Green - lgreen@noria.com CREATIVE DIRECTOR Ryan Kiker - rkiker@noria.com GRAPHIC ARTISTS Julia Backus - jbackus@noria.com Terry Kellam - tkellam@noria.com ADVERTISING SALES Tim Davidson - tdavidson@noria.com 800-597-5460, ext. 224 MEDIA PRODUCTION MANAGER Rhonda Johnson - rjohnson@noria.com CORRESPONDENCE You may address articles, case studies, special requests and other correspondence to: Editor-in-chief MACHINERY LUBRICATION Noria Corporation 1328 E. 43rd Court • Tulsa, Oklahoma 74105 Phone: 918-749-1400 Fax: 918-746-0925 Email address: jsowards@noria.com 10 X 8 6 X 2 5 MACHINERY LUBRICATION Volume 13 - Issue 4 July-August 2013 ( USPS 021-695) is published bimonthly by Noria Corporation, 1328 E. 43rd Court, Tulsa, OK 74105-4124. Periodicals postage paid at Tulsa, OK and additional mailing offices. POSTMASTER: Send address changes and form 3579 to MACHINERY LUBRICATION, P.O. BOX 47702, Plymouth, MN 55447-0401. Canada Post International Publications Mail Product (Canadian Distribution) Publications Mail Agreement #40612608. Send returns (Canada) to BleuChip International, P.O. Box 25542, London, Ontario, N6C 6B2. SUBSCRIBER SERVICES: The publisher reserves the right to accept or reject any subscription. Send subscription orders, change of address and all subscription-related correspondence to: Noria Corporation, P.O. Box 47702, Plymouth, MN 55447. 800-869-6882 or Fax: 866-658-6156. Copyright © 2013 Noria Corporation. Noria, Machinery Lubrication and associated logos are trademarks of Noria Corporation. All rights reserved. Reproduction in whole or in part in any form or medium without express written permission of Noria Corporation is prohibited. Machinery Lubrication is an independently produced publication of Noria Corporation. Noria Corporation reserves the right, with respect to submissions, to revise, republish and authorize its readers to use the tips and articles submitted for personal and commercial use. The opinions of those interviewed and those who write articles for this magazine are not necessarily shared by Noria Corporation. CONTENT NOTICE: The recommendations and information provided in Machinery Lubrication and its related information properties do not purport to address all of the safety concerns that may exist. It is the responsibility of the user to follow appropriate safety and health practices. Further, Noria does not make any representations, warranties, express or implied, regarding the accuracy, completeness or suitability, of the information or recommendations provided herewith. Noria shall not be liable for any injuries, loss of profits, business, goodwill, data, interruption of business, nor for incidental or consequential merchantability or fitness of purpose, or damages related to the use of information or recommendations provided. Table 1. Benefits of using constant-level or off-line circulation July - August 2013 |3