Instruction Manual
D104734X012
ATST Desuperheater
July 2022
3
Figure 2. Typical Fisher ATST Installation
KEY:
DSPL = DOWNSTREAM STRAIGHT PIPE LENGTH
PI = PROPORTIONAL INTEGRAL CONTROLLER
PSL = PRESSURE SENSOR LENGTH
PT = PRESSURE TRANSMITTER
TE = TEMPERATURE SENSOR ELEMENT
TSL = TEMPERATURE SENSOR LENGTH
USPL = UPSTREAM STRAIGHT PIPE LENGTH
USPL
X0355A-1
TSL
PSL
DSPL
PI
PT
TE
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Personal injury or equipment damage caused by sudden release of pressure may result if the ATST desuperheater is
installed where service conditions could exceed the limits of the pressure rating noted on the nameplate. To avoid such
injury or damage, provide a relief valve for over pressure protection as required by government or accepted industry codes
and good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
WARNING
When ordered, the desuperheater configuration and construction materials were selected to meet particular pressure,
temperature, pressure drop, and fluid conditions. Do not apply any other conditions to the desuperheater without first
contacting your
1. Before installation, all piping upstream of the desuperheater must be cleaned so that no loose materials such as
welding slag, dirt or other foreign matter are left in the pipe. Use care to keep foreign matter out of the line
openings while preparing the desuperheater installation.
