Fisher Fisher Yarway 25 VenTemp Desuperheater Manuals & Guides

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Page 1

Instruction Manual

D104420X012

Yarway VenTemp Desuperheater

Service Instructions for Yarway™ AT-25

™

VenTemp

Desuperheater

January 2019

This instruction manual was prepared by Emerson.

Do not install, operate or maintain this product 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 of the contents of this manual, including all safety cautions and warnings.

If you have any questions about these instructions, contact your Emerson sales office

before proceeding.

Installation

WARNING

Always wear protective gloves, clothing, and eyewear when performing any installation operations. Check with your process or safety engineer for any other hazards that may be present from exposure to process media.

Personal injury or equipment damage caused by sudden release of pressure may result if the desuperheater is installed where service conditions could exceed the limits given on the product 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.

CAUTION

When ordered, the desuperheater configuration and construction materials were specified 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.

www.Fisher.com

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Yarway VenTemp Desuperheater

January 2019

Instruction Manual

D104420X012

Maintenance

WARNING

Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing any maintenance operations:

D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.

D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure

from both sides of the valve. Drain the process media from both sides of the valve.

D Use lock-out procedures to be sure the above measures stay in effect with you work on the equipment.

D Check with your process or safety engineer for any other hazards that may be present from exposure to process media.

CAUTION

When adjusting the travel stop for the closed position of the valve ball or disk, refer to the appropriate valve instruction manual for detailed procedures. Undertravel or overtravel at the closed position may result in poor valve performance and/or damage to the equipment.

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Yarway and VenTemp are marks 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. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Emerson Automation Solutions

Marshalltown, Iowa 50158 USA Sorocaba, 18087 Brazil Cernay, 68700 France Dubai, United Arab Emirates Singapore 128461 Singapore

www.Fisher.com

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YARWAY MODEL 25 VEN-TEMP DESUPERHEATER

InstallatIon and MaIntenance InstructIons

Before installation these instructions must be fully read and understood

UNPACKING

The Ven-Temp Desuperheater, Model 25, is packed with the greatest of care in wooden boxes or cartons for protection during handling and transit to site. After hydrostatic testing, the Ven-Temp Desuperheater is flushed through with a high grade of preservative to protect machined and internal surfaces from corrosion. If it is found, however, that damage has occurred during shipment, then this should be reported immediately to your forwarder or Yarway representative. Particular care should be taken when removing the Ven-Temp Desuperheater from its packing and your special attention is required to check carefully that no damage has occurred to flange faces, threadings and butt weld profiles (see figure 1).

INSTALLATION OF THE VEN-TEMP DESUPERHEATER

Before installation, check the Ven-Temp Desuperheater for any visible damage. Make sure that protective covers are removed and that butt weld ends and flange faces are clean and without blemish. Any damage to the unit should be reported immediately to your forwarder or Yarway representative.

Checkthattheinformationonthe documentation, identification plate and tag number complies with the order specification. Remove the Ven-Temp Desuperheater carefully from its packaging, lifting by means of straps around the body, or use the hoisting lug if provided. Do not use the water inlet connectionfor lifting.

The minimum pipe run, required downstream of the Ven-Temp Desuperheater, varies with each individual application and would be specified by Yarway at the enquiry stage. This straight run is needed to prevent erosion due to impingement of water droplets against pipe walls, valves and fittings. Upstream straight run is normally 2 x D and the outlet straight run 4 meters, as a minimum. The distance from the Ven-Temp Desuperheater to the temperature sensor is nominally 12 - 15meters , although the distance specific to the application would be advised by Yarway at the enquiry stage. Longer distances will ensure that full evaporation of the water will take place at lower steam velocities.

The temperature sensor should be located in the upper half of the pipe, avoid branching of the steam pipework between the Ven-Temp Desuperheater and the sensor.

When installing the Ven-Temp Desuperheater use gaskets and bolting material in accordance with the relevant piping code, for example ASME B31.1 or EN. Butt weld Ven-Temp Desuperheaters should be welded inline using proper weld procedures. Carefully check the material compatibility of both body and piping. In case of doubt consult Yarway. Post weld heat treatment should be done with the pipeline filled with an inert gas. Oxidation of the vena contracta area may lead to significant higher pressure drop over the Ven-Temp Desuperheater than calculated. The unit shall be installed with the water connection vertically upwards. For an installation example, seefigure 2.

Note: the Ven-Temp Desuperheaters should befree of ‘forces, moments and torques’.

RECOMMENDATIONS (acid cleaning of steamboilers)

Remove Ven-Temp Desuperheaters from thepiping prior to acid cleaning!

Emerson.com/FinalControl

VCIOM-03236-US 15/04

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YARWAY MODEL 25 VEN-TEMP DESUPERHEATER

InstallatIon and MaIntenance InstructIons

Pipe bends should always be of the long radius type to assist in keeping the water droplets in suspension, until complete evaporation has taken place. Installation may be in vertical or horizontal piping, but the direction of water injection should always be with the steam flow, vertical downwards injection is not advised. The steam flow direction is marked on the Ven-Temp Desuperheater body by an arrow. The position of the water inlet should be12o’clock.

FIGURE 1

The water supply should be of a good quality, clean and filtered for example boiler feed water and should have a constant pressure as specified in the order documents. Each water supply line should be protected with its own individual strainer (7) with a maximum element perforation size of 0.1 mm. As in the case of the steam pipework, use gasketing and bolting in accordance with the relevant piping code. Flush out the water line before connecting to the Ven-Temp Desuperheater mounting flange.

Check for damages

Retractable injection nozzle

Check for damages

FIGURE 2

Water

7 8 9

Steam

•

Check for damages

•

Air

Nameplate with identification number

Item Description

1 Temperature sensor 2 Temperature transmitter 3 Temperature controller 4 Ven-Temp Desuperheater 5 Air filter regulator 6 Water control valve

7 Strainer 8 Check valve 9 Flange 10 Pneumatic or E/P positioner

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YARWAY MODEL 25 VEN-TEMP DESUPERHEATER

InstallatIon and MaIntenance InstructIons

START-UP

Ensure that all components are installed correctly. Connection of electrical supplies and instrument air piping should be in accordance with the manufacturer’s instruction manual. Verify and adjust, if necessary, set points for filter regulator(5) and valve positioner (10), following the manufacturer’s recommendations. Similarly, calibrate the temperature transmitter/controller (2) (3), verifying automatic response to temperaturechanges.

Warm the steam main and open the valve in the water supply. Check the water pressure at the Ven-Temp Desuperheater. Verify the operation of the temperature transmitter and controller by manually increasing and decreasing the output signal and observing indicated and recorded temperatures. When satisfactory coordination between instrument signals and temperature is attained, adjustment of the set point can be made and the system transferred to automatic operation. It is advisable to record the various steam coordinates, over a sustained period, to verify operation, adjusting where necessary.

MAINTENANCE

Note

Maintenance of the Ven-Temp Desuperheater is straight forward and does not require any special tools or training. Care should be taken during any maintenance operation, particularly when working with grinders, compressed air and rotating machinery. It is imperative that safety glasses and protective workwear are used in accordance with standard safety procedures. In case of doubt, consult your supervisor or safety officer before commencing any work on the equipment.

Injection nozzle

Injection nozzles may be retractable, dependingon execution. Nozzles with holders can be ordered as a complete spare part from Yarway. Check your certified order drawing for the nozzle type supplied.

Re-installation

When re-installing the Ven-Temp Desuperheater make sure that the injection nozzle opening points into the downward flow direction!!! Use a high temperature nickel compound on the flange bolting. Do not re-use the graphite seals. Replace these seals when overhauling the Ven-Temp Desuperheater.

SPARE PARTS

Make sure that the identification number (indicated on the nameplate) is verified and specified when ordering spare parts. For cross sectional drawing and part list, see next page.

STORAGE PROCEDURE

Upon receipt, check both the Ven-Temp Desuperheater and the packing case for any transit damage. Any damage to the packing container should be rectified to prevent the ingress of dust or water, prior to placing the equipment into storage. Check the information contained on the identification plate and documentation and return the unit to its packing with protective covers in place (see figure 1).

For short term storage, up to 6 months duration, no additional preservation measures are necessary. Retain the unit in its original packing in a clean, dry indoor location. If outdoor storage is unavoidable, then the packing case should be enclosed in a waterproof covering.

Removal

Before removing the Ven-Temp Desuperheater from the system, ensure that both the steam- and water pipework are pressureless and vented. Isolate any electrical/pneumatic supply to the actuator of the water valve, prior to disconnection. Loosen steam flanges/butt welds and water flange, but vent connections before complete removal.

The Ven-Temp Desuperheater may now be removed from the system. It is recommended that the Ven-Temp Desuperheater is transported to a convenient workshop which has a workbench and vice. Lift the unit by means of straps around the body, or use the hoisting lug if provided.

For long term storage use only a dry indoor location. Apply a cosmoline type grease to machined faces. Retain in its original packing and inspect at 3 monthly intervals to ensure that no deterioration has occurred.

Note

Materials and data of units supplied, may deviated from this Instruction Manual. Please consult order documents in case of doubt.

CE marking depends on line size and will be determined when ordered.

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YARWAY MODEL 25 VEN-TEMP DESUPERHEATER

InstallatIon and MaIntenance InstructIons

•

TABLE 1 - STANDARD MATERIALS

Carbon steel Low alloy High alloy

Item Name

1• Spray direction indicator 2• Gasket St.st./Graphite 1. 4541/Graphite St.st./Graphite 1.4541/Graphite St.st./Graphite 1.4541/Graphite

3 Water flange SA 105 P250GH SA 182 F11 1.7335 SA 182 F22 1.7380 4*• Nozzle SA 182 F316 1.4401 SA 182 F316 1.4401 SA 182 F316 1.4401 5 Nameplate St. steel St. steel St. steel St. steel St. steel St. steel 6 Body SA 105 P250GH SA 182 F11 1.7335 SA 182 F22 1.7380 7*• Nozzle pipe SA 182 F316L 1.4404 SA 182 F316L 1.4404 SA 182 F316L 1.4404

ASTM EN ASTM EN ASTM EN

NOTES

* Supplied as assembled spare part

• Recommended spares

Other materials are available upon request

Certification

Ven-Temp Desuperheaters are approved by authorizedauthorities to comply with the requirements of ASMEB31.1 Non-BEP or EN13445. All data subject to changes.