Piping Arrangements; Figure 12 - St 700 Standard Transmitter - Typical 3-Valve Manifold With Blow-Down Piping - Honeywell SmartLine ST 700 User Manual

4.5.1 Piping Arrangements

Piping arrangements vary depending upon process measurement requirements and the transmitter
model. For example, a differential pressure transmitter comes with double-ended process heads with
¼-inch NPT connections, which can be modified to accept ½-inch NPT through optional flange
adapters. Gauge pressure transmitters are available with various connections for direct mounting to a
process pipe.
A ½-inch, schedule 80, steel pipe is commonly used for transmitter integration into a process system.
Many piping arrangements use a three-valve manifold to connect the process piping to the transmitter.
A manifold makes it easy to install and remove or re-zero a transmitter without interrupting the
process. A manifold also accommodates the installation of blow-down valves to clear debris from
pressure lines. Figure 12
blow-down lines for a differential pressure transmitter being used to measure flow.
To Downstream Tap
Blow-Down
Valve
Blow-Down
Piping
To Was te
Figure 12 – ST 700 Standard Transmitter - Typical 3-Valve Manifold
Revision 13
represents a typical piping arrangement using a three-valve manifold and
3-Valve
Manifold
To Lo w Pressure
Side of Transmitter
with Blow-Down Piping
ST 700 SmartLine Pressure Transmitters User's Manual
To Upstream Tap
Blow-Down
Piping
To High Pressure
Side of Transmitter
To Was te
Blow-Down
Valve
21010
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