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On critical rotating
equipment,
oil sampling
has long been recognized as a prime indicator of mechanical condition
and
reliability. Most manufactures of gearboxes, drive train
components,
and hydraulic systems specify oil cleanliness levels in their warranty,
yet only few make provisions or recommendations for oil sampling.  Conventional
sampling tubes are sold as a "one piece" assembly which includes the
sampling valve (test point) with a permanently attached, 3/16" diameter
carbon steel pitot tube, and a
1/4" NPT male pipe thread.
Connection to the machinery is through a 1/4" female pipe port. Where internal obstructions interfere with
strait in-line access to an active oil zone, a pipe swivel is added to
the fixed assembly. This permits
a
limited degree of pre installation offset, prior to final
installation. When installed in a larger pipe port,
reducer bushings are required.
 For most Lo-Viscosity
applications using lighter lubricating oils up to ISO VG 150 the sampling valve is a standard Minimess
Series B test point with a tethered cap. For Hi-Viscosity
applications applications
using gear oils from ISO VG 220 and up, the Minimess test point is replaced with a
"Hi-Flow" sampling valve and tethered cap. The 3/16" pitot
tube and 1/4" NPT male pipe thread remains the same as in the lo-
viscosity one piece assembly. For drawing an oil sample with a
hand held vacuum pump, the appropriate sampling probe is attached to
the 1/4" poly sampling tube then to the vacuum pump.When using the conventional one piece sampling tube on Hi- or Lo-Viscosity applications, the main problem remains the highly restrictive inside diameter of the pitot tube. OILMISER™ Hi-Viscosity Sampling Tubes & Sampling Valves W
 hen it comes to pulling an oil
sample, size counts. All OILMISER Sampling Tubes use a stainless steel pitot tube with a much larger 1/4" Inside Diameter. This feature lowers the flow resistance to heavier gear oils, and "significantly reduces" the time and effort required to draw an oil sample. Four times the inside area of conventional pitot tubes, means one quarter the effort. The OILMISER Sampling
Tube is a three piece assembly.
The three separate
components include the gland-se al
bushing ,
a stainless steel pitot
tube
and a gland-seal tube
retainer .
This configuration gives unparalleled
flexibility
to the OEM, the Service
Contractor and the End User. Now in a matter of minuets, a
sampling
tube and an oil sampling valve can be added to most gearboxes and
reservoirs
using
an existing top, bottom or side access port.
Installing
OILMISER™
Hi-Viscosity Sampling Tubes
Like
all OILMISER Products,
the ease of installation in
the work place is the overriding
design
criteria for OILMISER Sampling
Tubes.
Once
the appropriate access port
on the
gearbox or reservoir has been determined, the gland-seal bushing can be
permanently installed.  In
some cases, internal
obstructions
may come into play. The exclusive OILMISER three piece design
maximizes
the amount of pre installation offset that can be accommodated.
The pitot tube is inserted into the gland seal bushing and
pre-formed. The gland-seal bushing and tube assembly is then
fed into the gearbox access port and fully tightened. Using
the OILMISER Tube Orientation Tool, the
pre-formed pitot
tube can be accurately positioned inside the gearbox. The
gland-seal tube retainer is then tightened, locating the pre-formed
tube in the correct location.All OILMISER Hi-Viscosity Sampling Tubes terminate in 1/4" NPT (female) pipe. Two configurations are available, strait in-line, or in a 90 degree swivel, giving a full 360 degrees of rotation. Now the final orientation of the sampling valve can address both the safety and efficiency of the service technician under operating conditions. Sampling valves are ordered separately.
JLM Systems Ltd. |
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