Instruction Manual
D104734X012
ATST Desuperheater
July 2022
4
WARNING
Do not lift the desuperheater by its cooler manifold piping. Personal injury or damage to equipment could occur if the
desuperheater is improperly lifted into place.
All lifting and rigging must be completed in accordance with federal/national/provincial, state and local regulations
and applicable lifting and rigging equipment standards. Only personnel trained in proper lifting and rigging practices
shall perform desuperheater assembly lifting, rigging and installation. Because each lift will be unique, the method of
lifting thedesuperheater assembly, the correct location for attaching and lifting the desuperheater assembly, and what
the desuperheater assembly will do when lifted shall be considered for each lift.
Lifting and rigging equipment used to lift, install or remove a desuperheater assembly or component must be
properly selected and sized for the weight and configuration of the desuperheater assembly or component being
lifted. The weight of the complete desuperheater assembly, including attached accessories, must be taken in
consideration for this purpose. The lifting and rigging equipment must be properly maintained and inspected for
damage before each use.
Lifting lugs or other lifting equipment attached to the desuperheater must never be used to lift or support the weight
of attached piping.
If the ATST is equipped with buttweld ends, the
desuperheater
body must be supported using a lifting sling or other
method that does not place a load or force onto the finished surface of the buttweld ends. The ATST does not have a stable
resting condition. The
desuperheater
inlet and outlet must be fully supported until fully welded (buttweld end
connections) or bolted (flanged end connections) into the piping.
2. Arrange lifting slings, or other lifting and rigging equipment appropriate for the desuperheater weight and
configuration
,
around the main steam pipe to safely lift the ATST to the pipe opening.
WARNING
Do not expose the ATST to undue stresses by installing it in bent pipes or flanges. Personal injury and equipment damage
could result from flange sealing failure due to improper installation.
3.
Flanged Connections—
Lubricate the flange connection bolts with a high temperature thread lubricant. Install flange
gaskets and connection bolts per accepted practices and tighten securely.
4.
Welded Connections—
Welding procedures should be in accordance with the applicable codes and the base
materials. For preheat, welding electrodes, and postweld heat treatment, refer to the applicable codes and
practices applicable for the specific facility. Materials are specified on the customer specification sheet.
NOTICE
Depending on desuperheater body materials used, post weld heat treating may be required. If so, damage to internal parts
is possible. In general, if post weld heat treating is to be performed, all nozzles should be removed. Contact your
for additional information.
5. Remove the spraywater control valve and flush the cooling water line until all debris is removed from the line prior
to connecting it to the ATST desuperheater. Use only clean sources of cooling water to reduce the possibility of
nozzle clogging. A strainer should be installed in the water line as close to the ATST desuperheater as possible. To
determine appropriate mesh size, refer to desuperheater sizing and specification document, or contact your
Emerson sales office. Review strainer manufacturer's pressure drop curves to determine appropriate strainer body
size. You may need to use a strainer that is larger than the water line size.
6. Remove the atomizing steam valve and flush the steam line until all debris is removed from the line prior to
connecting it to the ATST desuperheater.
