KROHNE OPTIMASS Series Handbook page 16

Liquid / Steam heating jacket
The meter can be supplied with a heating jacket. This jacket is designed to minimise the differential
stress across the meter where differences in temperature between outer cylinder and measuring tube
exist.
The connections to the heating jacket are NPT or Ermeto sockets.
It is recommended that reinforced flexible hoses be used to connect the heating jacket to the heat
source.
Important:
Always heat jacket to working temperature before flowing product in measuring tube.
It is important to avoid the use in the heating jackets of fluids which cause crevice corrosion.
Regarding jacket materials. Although all the jacket materials are 316L, the outer cylinders are 304L
(Optional 316L).
Connections should be made to ensure all air can be vented on liquid systems and all condensate can
be drained on steam systems.
Note :
Max heating medium pressure and temperature for heating jackets is 10 bar at 150°C or 145 psig at
300°F for titanium measuring tubes and 10 bar at 100°C or 145 psig at 210 °F for Hastelloy and
Stainless Steel measuring tubes.
Heating Times
The following graphs are provided as a guide only. Heating times were calculated and tested using the
following conditions:
• Ambient temperature 25°C or 80°F
• Meter insulated.
The Titanium meters were heated using a steam temperature of 150°C or 300°F and the Hastelloy and
Stainless Steel meters using a temperature of 100°C or 210°F.
Heating times may vary depending on the quality of insulation (if any), ambient temperature and
temperature of the heating medium. Once meter has been heated to a temperature where the product
will not solidify, product may be introduced if required. This will bring the meter to operating temperature
sooner.
Note:
The maximum heating temperature for a Titanium meter is 150°C or 300°F.
The maximum heating temperature for Hastelloy or SS meters is 100°C or 210°F.
If these temperatures are exceeded, the meter will be damaged.
KROHNE accepts no responsibility if this happens.
Installation and Operating Instructions OPTIMASS 15