Fisher TBX-T Instruction Manual

Instruction Manual

D103796X012

Fisher™ TBX-T Desuperheater

TBX-T Desuperheater

July 2017

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Educational Services 2.........................

Installation 3..................................

Maintenance 5.................................

Servicing 5...................................

Parts Ordering 9................................

Parts List 9....................................

Introduction

Scope of Manual

Figure 1. Fisher TBX-T Desuperheater

X0162

This instruction manual includes installation, maintenance, and operation information for the Fisher TBX-T
desuperheater. Refer to separate instruction manuals for instructions covering the actuator and accessories.

Do not install, operate, or maintain a TBX-T 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
proceeding.

or Local Business Partner before

Description

Water atomization and vaporization are key elements in any steam conditioning application. The TBX-T design
incorporates a spraywater manifold of variable geometry AF nozzles that 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 research in spray atomization and vaporization were key to optimizing the water injection
system. Extensive use of CFD analysis, in addition to field performance feedback, was used to validate spray system
enhancements.

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TBX-T Desuperheater

July 2017

Table 1. Specifications for Standard Designs (Physical Specifications)

Instruction Manual

D103796X012

Steam Line Connection Sizes

NPS 8 through NPS 48

Steam Line Connection Types

J ASME Buttweld (all sizes)
J ASME Raised Face Flanges (all sizes)
J ASME Ring Type Joint Flanges (all sizes)

Construction Materials

Steam Pipe:
F22 (2-1/4 Cr-1 Mo)

J SA105 carbon steel, J SA182 Grade

J SA182 Grade F91 (9 Cr-1

Mo-V)

Nozzles:
Gaskets:

1. Do not exceed the pressure or temperature limits in this instruction manual, nor any applicable code or standard limitations.

2. A function of required turndown and equipment selection.

J S41000 stainless steel

J N06600/Graphite

(1)

Bolting:

J N07718

Spraywater Connection

J NPS 1 through NPS 4
J ASME Raised Face Flange (all sizes)
J ASME CL150 to CL2500

Maximum Inlet Pressures

J SA193 Grade B7, J SA193 Grade B16,

(1)

(1)

Consistent with applicable pressure-temperature
ratings per ASME B16.34

Spraywater Pressure Required

(2)

3.5 to 35 bar (50 to 500 psi) greater than steam line
pressure

Educational Services

For information on available courses for Fisher TBX-T desuperheaters, as well as a variety of other products, contact:

Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [e-mail]
emerson.com/fishervalvetraining

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D103796X012

Figure 2. Typical Fisher TBX Installation

USPL

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

X0355

USPL = UPSTREAM STRAIGHT PIPE LENGTH

TBX-T Desuperheater

July 2017

TSL
PSL

DSPL

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 TBX-T 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.

CAUTION

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 local Emerson sales office

1. Before installation, all piping upstream of the valve must be blown clean 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 valve installation.

or Local Business Partner.

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TBX-T Desuperheater

July 2017

Instruction Manual

D103796X012

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.

If the TBX-T is equipped with buttweld ends, the valve 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 TBX-T does not have a stable resting
condition. The valve inlet and outlet must be fully supported until fully welded (buttweld end connections) or bolted
(flanged end connections) into the piping.

2. Arrange a lifting sling around the main steam pipe to safely lift the TBX-T to the pipe opening.

WARNING

Do not expose the TBX-T 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—Grease 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.

CAUTION

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 Emerson

sales office or Local Business Partner 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 TBX-T desuperheater. Use only clean sources of cooling water to reduce the possibility of
nozzle clogging. A 100 mesh strainer should be installed in the water line as close to the TBX-T desuperheater as
possible. 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.

WARNING

Failure to use a strainer could result in nozzle clogging and subsequent property damage or loss. Uncontrolled
temperatures resulting from clogged nozzles may result in equipment or process temperature limits being exceeded.
Exceeding system temperature limits could result in property damage or personal injury.

6. A length of straight pipe is required downstream of the TBX-T desuperheater to ensure complete vaporization of

cooling water. An example of a typical installation appears in figure 2. Consult the TBX-T cooler sizing sheet for the
required distance of straight pipe. This is unique for each application and is supplied by Emerson Automation
Solutions.

7. Typically, a temperature sensor should be mounted a minimum distance of 9.1 m (30 feet) downstream of the

TBX-T desuperheater. This distance will vary depending on a number of factors including steam velocity and

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