The test information you require is available from many standards organisations e.g. ISO, DIN or ASTM. Instrument suppliers can be found similarly although it seems like a waste of time asking for Indian suppliers if the gear is hardly used in India.

Many thanks for pointing out that most Indian manufacturers do not bother with testing. It may, or may not, comfort several learned commentators. ■

I know of three India idler suppliers who can/do measure seal drag as witnessed by myself:

1. Elecon - validated measurements on Dahej Port 6309/6310 (?) bearings that were close to FMC from China used at Mundra Port

2. Kali - most comprehensive

3. ThyssenKrupp - used by being updated ■

I take back my just posted comment. They do not only measure seal drag. They measure bearing, lubricant and seal drag over a speed range. They do not measure influence of temperature or compare lubricant properties. University of Newcastle, Australia does and offer outstanding reports on findings in an impartial format. ■

Originally Posted by nordell

I take back my just posted comment. They do not only measure seal drag. They measure bearing, lubricant and seal drag over a speed range. They do not measure influence of temperature or compare lubricant properties. University of Newcastle, Australia does and offer outstanding reports on findings in an impartial format.

Hi nordell,

Is there any effect of tempreture on drag test? Because some of clients ask to do drag test at 20 deg.

Ravi ■

Hi Nordell,

What is the effect of tempreture on idler drag test? Now a days, some customers ask to perform test at 20deg.

Ravi ■

Originally Posted by Ravi Gor

Hi Nordell,

What is the effect of tempreture on idler drag test? Now a days, some customers ask to perform test at 20deg.

Ravi

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The afore mentioned Indian suppliers do not measure temperatures, by my memory. They do test their own idler sets upon specific requests. Speed, Load, their lubricant and bearings with and without seals can be measured.

University of Newcastle, NSW Australia measures all features including temperature and does all manufacturers.

Temperature has a major effect due to changes in lubricant viscosity and type of seals for a given bearing. Precismeca did publish this in their idler design catalog from the 1970's(?). Their catalog is now rare like hen's teeth. The temperature effect various with speed, which are related and become pronounced below zero Centigrade.

When designing for high speed, greater than 5 m/s, the engineer should know the effect. Conveyor Dynamics, Inc. (CDI) have developed a library for most major bearing sizes to 6312, lubricants down to -50C, and speeds to 10 m/s. The variation can be substantial compared to 20 C. The drag multiple can exceed 3:1. In some cases we have measured seal drag increases to 16:1 with poor seal designs.

A major concern is lubricant cavitation at higher speed and colder environment. Lubricants can vary drag by greater than 2:1, but, the EP grease type and contact pressure needs to be studied for the given installation. ■