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Instrument Installation
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Design Considerations - index
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Temperature Instruments


DOE-HDBK-1132-99
space requirements for installation, operation, maintenance, calibration,
replacement, accessibility, and electrical flexible conduit installation;
vibration-free mounting on available structures;
interference with other commodities;
environmental conditions (radiation, temperature, moisture, noise, etc.).
To provide sufficient slope requirements and thus avoid gas and liquid pocketing
in sensing lines, the required instrument location relative to its process
connection should be as follows:
Instrument Location
Fluid
Elevation
Liquid
Below line connection
Slurry
Below line connection
Steam over 20 psia
Below line connection
Steam under 20 psia
Above line connection
Gas
Above line connection
Instruments that cannot be connected with proper slope should be provided with
accessible vent and drain points.
Vent and drain connections for hazardous or radioactive processes
should have provisions for safe disposal of fluid.
Where practicable, instrument mounting heights should be 4 feet,
6 inches from the floor.
Pressure Instruments .
4.9.3
Condensate pots are not necessary for a sensing element that has a
negligible dynamic displacement (e.g., a force-balance transmitter). If
displacement is not negligible and process fluid is steam, other
condensable fluid, or other fluid that may flash, condensate pots should
be used. If condensate pots are used, their volume should be at least
three times the volume of the displaced volume.
II-50


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