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Guides techniques

Tetra a publié une série de guides qui peuvent être commandés.

HRSG Tube Failure Diagnostic Guide (3rd Edition)

Heat Recovery Steam Generator (HRSG) tubes provide the media for extraction of useful energy from the waste heat in gas turbine exhaust at combined cycle power plants (GT-CCs) or from heat generated by process streams at petrochemical facilities.

HRSG Inspection Planning Guide (2nd Edition)

Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG). Visual inspections are performed at regular intervals in accordance with the requirements of regulatory bodies and insurers.Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG). Visual inspections are performed at regular intervals in accordance with the requirements of regulatory bodies and insurers.

Livres blancs techniques

Une sélection de documents techniques disponibles à titre de référence.

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HRSG Tube Failure Statistics

HRSG Tube Failure Statistics

Tetra Engineering Group, Inc. (TETRA) has assisted the owners of natural gas-fired combined cycle plants with ...

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GT Upgrade Effects on HRSG Pressure Parts

GT Upgrade Effects on HRSG Pressure Parts

Tetra Engineering Group, Inc. (TETRA) has assisted the owners of natural gas-fired combined cycle plants with ...

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HRSG Inspections - The Key to Reliability

HRSG Inspections - The Key to Reliability

Inspection is part of routine maintenance for any Heat Recovery Steam Generator (HRSG). Visual inspectio...

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Pressure Boundary Inspection Quick Guide

Pressure Boundary Inspection Quick Guide

Effective HRSG inspections focus on damage mechanisms that could affect each of the specific components; not all components are susceptible to all damage types.

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Inspection Technology for Heat Recovery Steam generators (HRSG)

Inspection Technology for Heat Recovery Steam generators (HRSG)

In addition to selecting inspection technology, the group responsible for inspection must have a clear underst...

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Remote Visual Inspection (RVI), or Borescope

Remote Visual Inspection (RVI), or Borescope

One of the first applications of the borescope was for inspecting steam turbine rotor discontinuities in the 1...

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Articles, présentations et articles

Sélection d'articles, de présentations et d'articles issus de conférences et d'événements majeurs de l'industrie.

Title
Author
What do HRSG tube failure statistics tell us?
What do HRSG tube failure statistics tell us?What do HRSG tube failure statistics tell us?
Misha Gadher & Mark Taylor
Modern Power Systems
Counterfeit, Fraudulent and Suspect Items (CFSI) – Steel and HRSGs
Counterfeit, Fraudulent and Suspect Items (CFSI) – Steel and HRSGsCounterfeit, Fraudulent and Suspect Items (CFSI) – Steel and HRSGs
Taylor M.
IMechE HRSG User Group 2022
Adapting Existing Thermal Desalination Plants to Produce Hydrogen
Adapting Existing Thermal Desalination Plants to Produce HydrogenAdapting Existing Thermal Desalination Plants to Produce Hydrogen
Malloy J.
2022 World Utilities Congress
Root Cause Failure Investigation of MSCV Drain Failures
Root Cause Failure Investigation of MSCV Drain FailuresRoot Cause Failure Investigation of MSCV Drain Failures
P. Jackson, A. Wholey, E. Tsai and D. Burns
ASME 2022 Pressure Vessels & Piping Conference
Predicting and Preventing Risk of Vibration Induced Failures in Boilers and Heat Recovery Steam Generators (HRSG)
Predicting and Preventing Risk of Vibration Induced Failures in Boilers and Heat Recovery Steam Generators (HRSG)Predicting and Preventing Risk of Vibration Induced Failures in Boilers and Heat Recovery Steam Generators (HRSG)
Fabricius A., Malloy J., Taylor M., Moelling D.
Proceedings of the ASME 2022 Power Conference

Projets précédents

Avec plus de 30 ans d'expérience dans les services de production d'électricité et de vapeur industrielle, Tetra Engineering a une longue histoire de projets.

CFD Analysis of GRP Piping Caustic Dosing, 2018
Middle East.

CFD Analysis of GRP Piping Caustic Dosing, 2018

Caustic soda is injected into the product water in order to raise the pH as required by the specification. Inspection of GRP piping has often shown large amounts of deposition inside these pipes. Deposition is mostly observed downstream of the injection point of sodium hydroxide and can therefore be attributed to unsuitable chemical injection. Typical injection setups utilise four simple (no nozzle) injection ports at 90° from one another causing ineffective mixing of the flows, leading to the observed precipitation. Tetra performed a CFD analysis of the caustic injection process to investigate the degree of mixing of the two flows and simulate the effects of modifying the volumetric flow rate.

MSV Stellite Cracking Failure Analysis, 2018
Middle East.

MSV Stellite Cracking Failure Analysis, 2018

Caustic soda is injected into the product water in order to raise the pH as required by the specification. Inspection of GRP piping has often shown large amounts of deposition inside these pipes. Deposition is mostly observed downstream of the injection point of sodium hydroxide and can therefore be attributed to unsuitable chemical injection. Typical injection setups utilise four simple (no nozzle) injection ports aStaff at a CCGT plant engaged Tetra to investigate the root cause of the cracking and damage appearing on the Main Steam Valve (MSV) stellite seat ring(s). The metallurgical analysis identified iron dilution from the F91 valve seat into the hard-facing alloy as the root cause of the debonding.  The extent of the iron dilution is a sign of excessive heat input, most likely caused during the welding process. This points towards the welding during fabrication as the actual root cause of the failure. The driving force for failure / debonding of the Stellite hardfacing could also include residual stresses from welding and/or transient heat transfer stresses and/or thermal shock during operation.t 90° from one another causing ineffective mixing of the flows, leading to the observed precipitation. Tetra performed a CFD analysis of the caustic injection process to investigate the degree of mixing of the two flows and simulate the effects of modifying the volumetric flow rate.

Root Cause Analysis of HP Drum Nozzle Cracking, 2018
Europe

Root Cause Analysis of HP Drum Nozzle Cracking, 2018

During the 2018 shutdown at a CCGT in Europe several of the HRSG HP drum riser nozzle and downcomer nozzle welds were checked and all were found to be cracked on the inside of the drum, at the weld toe or between weld beads, with the cracks following the fusion line back to the nozzle. The drum feedwater inlet and steam outlet nozzles (above drum waterline) were both undamaged. The drums were removed and all welds were repaired in the workshops. Tetra performed Finite Element Analysis (FEA) and operational data analysis and could conclude that the operational stresses were high enough given the current cycling regime to cause the cracking observed. The quality and design of the original welds is also likely to have contributed to the cracking.

Diverter Damper Design & Operation Review, 2018
Middle East

Diverter Damper Design & Operation Review, 2018

Tetra was engaged by a client to investigate the recently observed cracking on the diverter damper actuator. The design documentation and failure mode was reviewed. From this initial review it could be concluded that the shaft cracking is most likely a result of the operating procedure, where  the damper is kept in an open position for an extended period of time. The exposure to hot flue gas in combination with the load acting on the toggle arms is the most likely source of the cracking

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