Process Insertion; Pressure Models; Piping; Figure 10 Typical 3-Valve Manifold And Blow-Down Piping Arrangment - Honeywell XYR 6000 Quick Start Manual

3.1

Pressure models

Piping

The actual piping arrangement will vary depending upon the process measurement requirements and the
transmitter model. Except for flanged and remote diaphragm seal connections, process connections are
made to ¼ inch or ½ inch NPT female connections in the process head of the transmitter's meter body. For
example, a differential pressure transmitter comes with double ended process heads with ¼ inch NPT
connections but they can be modified to accept ½ inch NPT through optional flange adapters. Some gauge
pressure transmitters may have a ½ inch NPT connection which mounts directly to a process pipe.
The most common type of pipe used is ½ inch schedule 80 steel pipe. 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 rezero a transmitter without interrupting the process. It also accommodates the installation
of blow-down valves to clear debris from pressure lines to the transmitter.
Figure 10 shows a diagram of a typical piping arrangement using a 3-valve manifold and blow-down lines
for a differential pressure transmitter being used to measure flow.
Figure 10 Typical 3-valve manifold and blow-down piping arrangement
Another piping arrangement uses a block-off valve and a tee connector in the process piping to the
transmitter as shown in Figure 11.
Revision 3
8/8/07

3. Process insertion

To Downstream Tap
Blow-Down
Valve
Blow-Down
Piping
To Low Pressure
Side of Transmitter
To Waste
OneWireless XYR 6000 Transmitters Quick Start Guide
To Upstream Tap
Blow-Down
3-Valve
Valve
Manifold
Blow-Down
Piping
To High Pressure
Side of Transmitter
To Waste
21010
13