18
Reference Manual
00809-0100-4809, Rev DA
Section 2: Installation
September 2015
Installation
The following restrictions and recommendations apply to impulse piping location.
Piping used to connect the Annubar sensor and transmitter must be rated for
continuous operation at the pipeline-designed pressure and temperature.
Impulse piping that runs horizontally must slope at least 1-in. per foot (83 mm/m).
With the Annubar mounted below the pipe, impulse piping must slope downwards
(toward the transmitter) for liquid and steam applications.
With the Annubar sensor mounted above the pipe, impulse piping must slope up
(toward from the transmitter) for gas applications.
For applications where the pipeline temperature is below 250 °F (121 °C), the impulse
piping should be as short as possible to minimize flow temperature changes. Insulation
may be required.
For applications where pipeline temperature is above 250 °F (121 °C), the impulse
piping should have a minimum length of 1-ft. (0.30 m) for every 100 °F (38 °C) over
250 °F (121 °C), which is the maximum operating transmitter temperature. Impulse
piping must be uninsulated to reduce fluid temperature. All threaded connections
should be checked after the system comes up to temperature, because connections
may be loosened by the expansion and contraction caused by temperature changes.
A minimum of
1
/2-in. (12mm) outer diameter (OD) stainless steel tubing with a wall
thickness of at least 0.035-in. is recommended.
Outdoor installations for liquid, saturated gas, or steam service may require insulation
and heat tracing to prevent freezing.
For installations where the transmitter is more than 6-ft. (1.8m) from the Annubar
sensor, the high and low impulse piping must be run together to maintain equal
temperature. They must be supported to prevent sagging and vibration.
Threaded pipe fittings are not recommended because they create voids where air can
become entrapped and have more possibilities for leakage.
Run impulse piping in protected areas or against walls or ceilings. If the impulse piping
is run across the floor, ensure that it is protected with coverings or kick plates. Do not
locate the impulse piping near high temperature piping or equipment.
Use an appropriate pipe sealing compound rated for the service temperature on all
threaded connections. When making threaded connections between stainless steel
fittings, Loctite
®
PST
®
Sealant is recommended.
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