Temperature; Lubricity - Total Control Systems 700-20 Engineering Manual

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
UL Viton
Viton
Simriz
Teflon
The Acetyl Face Gear and Bushings, in the register support assembly;
maximum temperature is 180F (82C)
2) Pressure rating at elevated temperatures.
SP/SPA/SPD/IP/IC/AF/SS
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.
-20F to 140F
-104F to 221F
-31F to 400F
-40F to 450F
-20F to 500F
Meter Type
150F/150PSI
200F/100PSI
250F/75PSI
300F/50PSI
- 7 -
-30C to 60C
-75C to 105C
-35C to 204C
-10C to 230C
-30C to 260C
LP
150F/350PSI
200F/275PSI
250F/250PSI
300F/150PSI