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Instruction Manual
D104734X012
Fisher
ATST Desuperheater
™
Contents
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Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and operation information for the Fisher ATST
desuperheater.
Do not install, operate, or maintain an ATST desuperheater without being fully trained and qualified in
valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or
property damage, it is important to carefully read, understand, and follow all the contents of this manual,
including all safety cautions and warnings. If you have any questions about these instructions, contact your
Emerson sales office
Description
Water atomization and vaporization are key elements in any steam conditioning application. The ATST design
incorporates a manifold of patented nozzles to inject atomizing steam and spraywater into process steam. These
specialized nozzles produce an optimized spray pattern over a wide operating range. These nozzles are strategically
placed to achieve optimal mixing and quick vaporization at all flowing conditions. Years of experience with other
steam atomized desuperheater designs went into the development of this construction. Extensive use of
computational analysis, in addition to field performance feedback, was used to validate spray system performance.
www.Fisher.com
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before proceeding.
Figure 1. Fisher ATST Desuperheater
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X1892
ATST Desuperheater
July 2022
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Summary of Contents for Emerson Fisher ATST Desuperheater
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Page 1: Table Of Contents
™ Contents Figure 1. Fisher ATST Desuperheater Introduction ....... . . -
Page 2: Educational Services
3. Offerings meet ASME standards. Consult your Emerson sales office for additional options. 4. Intermediate rating above CL2500 available upon request. PN ratings also available per pressure requirements of EN1092-1. Consult your Emerson sales office for additional information. 5. EN material options available upon request, consult your Emerson sales office for additional information. -
Page 3: Installation
Do not apply any other conditions to the desuperheater without first contacting your Emerson sales office. 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. - Page 4 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.
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Page 5: Maintenance
An example of a typical installation appears in figure 2. Consult the ATST cooler sizing sheet for the required distance of straight pipe. This is unique for each application and is supplied by Emerson. 8. Typically, a temperature sensor will be mounted downstream of the ATST desuperheater. This distance will vary depending on a number of factors including steam velocity and percentage of spraywater. -
Page 6: Servicing
During regularly scheduled maintenance, visually inspect the nozzles for wear and blockage. Your local Emerson Service Center or Emerson Accredited Service Provider can help to determine the extent of fatigue and the correct course of action. Poor performing nozzles or nozzle failure is typically caused by wear, corrosion, erosion, and/or blockage. - Page 7 RECOMMENDED BOLT TORQUE BOLT SIZE, INCH THREADS PER INCH LUBRICATION LbfSft Nickel Anti-Seize 1‐1/8 1‐1/4 1‐3/8 1268 1‐1/2 1654 1220 1. For other lubricants, contact your Emerson sales office for recommended bolt torque. 2. Torques for lubricated studs with heavy hex nuts.
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Page 8: Parts Ordering
WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson should not, under any circumstances, be used in any Fisher desuperheater, because they may void your warranty, might adversely affect the performance of the desuperheater, and could cause personal injury and property damage. - Page 9 Instruction Manual ATST Desuperheater D104734X012 July 2022 Figure 5. Fisher ATST Desuperheater FLOW...
- Page 10 Instruction Manual ATST Desuperheater July 2022 D104734X012 Figure 6. Fisher ATST Desuperheater Alternate View...
- Page 11 Instruction Manual ATST Desuperheater D104734X012 July 2022...
- Page 12 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.
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