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D) Temperature
The operating temperature has a great effect on the meter seals and its relationship to the
maximum pressure allowed with the flow meter castings. It will be necessary to reduce the
maximum rated working pressure as the operating temperature increases. Any metering
system operating over 160F (71C) will require extra clearance rotors to compensate for
material expansion. Any metering system operating over 180F (82 C) will require at least a
one (1) foot registration extension to protect the registration devices. Increase in temperature
may increase the corrosion rate of some products.
1) O-ring / Packing Seal Temperature Rating
UL Buna -20F to 140F -30C to 60C
UL Viton -104F to 221F -75C to 105C
Viton -31F to 400F -35C to 204C
Simriz -40F to 450F -10C to 230C
Teflon -20F to 500F -30C to 260C
The Acetyl Face Gear and Bushings, in the register support assembly;
maximum temperature is 180F (82C)
2) Pressure rating at elevated temperatures.
E) Lubricity
The lubricity or non-lubricity of the product will determine the bearing sleeve material
suitable for use. Products with no lubrication will require the use of Carbon Graphite or
Ceramic bearing sleeves. Products with lubrication will reduce friction between two metal
surfaces and help dissipate heat.
F) Suspensions & Suspended Solids
Products with a low percentage of soft suspensions or suspended solids will require clearance
rotors and/or Ceramic bearing sleeves to protect the meter from its abrasive effects. High
percentages (5%) of suspensions or suspended solids, or any hard solids, such as sand, are
not recommended for the 700 series meter. Due to the very tight machining tolerances any
solid, larger than the thickness of a piece of paper, has the potential of stopping the flow
through the meter and can cause damage to the meter.
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