3.2.6 Installation in still pipe/chamber
General chamber considerations
Dimensioning the chamber/pipe correctly and selecting the appropriate probe is key to
the success in these applications. When selecting a smaller chamber/pipe diameter, such
as 2-in., a flexible probe is not suitable due to the chance of it coming into contact with the
walls. Also, relatively large side inlets may interfere with the signal.
When gas lift and/or turbulence may occur (e.g. boiling hydrocarbons), a 3- or 4-in.
chamber/pipe diameter is recommended for maximum measurement reliability. This is
especially true in high pressure and high temperature installations.
Table 3-6: Recommended and Minimum Chamber/Still Pipe Diameters for Different
Probes
Probe type Recommended diameter Minimum diameter
Rigid single/segmented rigid
single
3 or 4 in. (75 or 100 mm) 2 in. (50 mm)
Flexible single 4 in. (100 mm) Consult your local Emerson
representative
Rigid twin
(1)
3 or 4 in. (75 or 100 mm) 2 in. (50 mm)
Flexible twin
(1)
4 in. (100 mm) Consult your local Emerson
representative
Coaxial 3 or 4 in. (75 or 100 mm) 1.5 in. (37.5 mm)
Large coaxial 3 or 4 in. (75 or 100 mm) 2 in. (50 mm)
(2)
(1) The center rod must be placed more than 0.6 in. (15 mm) away from the pipe wall.
(2) Applicable to pipe schedule up to 40s,40. For higher pipe schedule consult your local Emerson
representative.
Note
Metal pipes are preferred, especially in applications with low dielectric constant, to avoid
disturbances from objects near the pipe.
Reference Manual Mechanical installation
00809-0100-4530 April 2019
Reference Manual 35
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