To be Regarded as the Best Safety Valve Refurbishment Company in Australia

Bearing Oil
Analyser (BOA)

Type 5 BOA
Type 7 BOA

Bearing Oil Analyser

General Information

  • Oil Sight Glass, also known as: BOA (Bearing Oil Analyser) and Sludge Cup
  • Designed by Martin Kotchie in 2003, Director of SRV Engineering Pty Ltd since 1998.
  • High quality, durable Australian Made product, 316 S/S & Acrylic construction.
  • Sold Internationally to Chemical Plants, Oil Refineries, Power Utilities and Pump Manufacturers.



“Our success started with an order from Exxon/Mobil Fawley Refinery UK, where we supplied 1200 units. We designed the Sight Glass Type 5, which has now been accepted in many refineries around the world. “


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BOA Type 5 Installed in Exxon Mobil Refinery
BOA Magnet

Use of an Oil Sight Glass

  • On pumps that have oil sumps to improve the running time of the bearings and quality of the bearing oil.
  • The BOA allows oil samples to be taken from the bearing housing/sump by opening the ball valve drain, giving insight to the quality of the oil.
  • The BOA is installed into the pump housing drain plug underneath the pump housing/sump. This allows the oil quality to be seen through the sight glass, detecting any oil contamination and proportion of oil to water.
  • Monitoring oil quality can improve the life expectancy of the bearings by 50%.
  • A magnet is installed in the sight glass to attract metal particles that could potentially be contaminating the oil.
  • The BOA is easily removed when the pump is off and simply disassembled for cleaning. New O rings are fitted, to then be re-assembled and installed back onto the pump.
  • Type 7 is a shorter design for pumps where space is limited from the underside of pump bearing housing to the pump mounting base.



316 S/S

Materials for Type 5 and 7

  • The sight glass component is made out of a clear, 5mm (wall thickness) cast acrylic, which recommended maximum temperature is 90 degrees Celsius.  (Acrylic will not yellow in sunlight).
  • Both threaded end caps are 316 stainless steel, sealed by nitrile o-rings. This is to ensure that the unit is sealed effectively.
  • Top connection ½” S/S 316 Hex Nipple
  • Drain Ball Valve and 316 S/S Hex Plug
  • A magnet is secured inside to attract metal particles that may be contaminating the oil.
  • The overall weight of the S/S Sight glass is 600 grams