Piping The St 700 Basic Transmitter; Piping Arrangements; Figure 52- St 700 Basic Transmitter - Typical 3-Valve Manifold With Blow-Down Piping - Honeywell ST 700 User Manual

12.6 Piping the ST 700 Basic Transmitter

12.6.1 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 52 represents a typical piping arrangement using a three-valve
manifold and blow-down lines for a differential pressure transmitter being used to measure flow.
To Downst ream Tap
Blow-Down
Valve
Blow-Down
Piping
To W aste
Figure 52– ST 700 Basic Transmitter - Typical 3-Valve Manifold with Blow-Down Piping
Revision 8.0
3-Valve
Manifold
To Low Pressure
Side of Transmit ter
ST 700 SmartLine Pressure Transmitters User's Manual
To Upst ream T ap
Blow-Down
Piping
To High Pr essure
Side of Transmit ter
To W aste
Blow-Down
Valve
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