News

Tetra In Action #3 - June, 2016

Dubai: September, 2016 - Boiler & Steam Cycle Knowledge Workshops

Tetra Engineering announces a series of targeted workshops to provide thermal and process plant O&M engineers, managers and operators with a working knowledge in several aspects of the boiler and steam process technology. Drawing on our field experience working at power and process plants throughout the world, the objective is to provide attendees with clear instruction on the operator actions and design issues that can impact reliability, efficiency and operating life.  The programme comprises a set of focused, half-day training modules intended to leave attendees with a practical working knowledge on these issues.  A number of outside experts will join Tetra's senior staff in delivering the workshops.

The course syllabus can be found here.


Newly Published Technical Papers by Tetra Engineering Collaborators

An engineering consultant needs to stay up to date in his knowledge and try to contribute to furthering that knowledge.   Therefore, the staff engineers at Tetra don’t just work on commercial projects, they also take the time to do research and development on a variety of boiler and steam cycle engineering issues.  This is actively encouraged by the company as it only increases the level of skill that our collaborators can bring to bear for solving a given client’s problem. 

Over the years Tetra engineers have published many papers and attended numerous technical conferences and forums.   In the past 2 years the following papers were presented or published with collaborators from the various Tetra offices as authors or co-authors:

  1. Technical Paper and Presentation:  Impact of Startup Purge Credit on Combined Cycle Plant Operation. Authors: Andreas Fabricius, Mark Taylor, Dave Moelling (all Tetra Engineering); Proceedings of the ASME 2015 Power and Energy Conversion Conference PowerEnergy 2015, June 28-July 2, 2015, San Diego, California; (Link)
  2. Technical Presentation:  Chemical Cleaning of the HRSG Waterside: When, Where and How? James Malloy (Tetra Engineering) and Steve Wynne (Chemical Cleaning Consultants), European HRSG Forum, Munich May 11-13 2015. (Link)
  3. Technical Paper:  Premature Grade 91 failures - Worldwide Plant Operational Experiences, Authors: Andreas Fabricius and Dr. Peter Jackson (both Tetra Engineering); Journal of Engineering Failure Analysis, August 2016, Volume 66, Pages 398-406. (Link)
  4. Technical Paper and Presentation: Understanding Variations in Flow-Accelerated Corrosion Wear Rates in HRSG Evaporator Tubes,  Authors: James Malloy and Mark Taylor (Tetra Engineering) Jan Rusaas (R&R Consult, Denmark); Conference on Flow Accelerated Corrosion 24-27 May, 2016; Lille, France. (Link)
  5. Technical Article:  Covered Piping Systems O&M Programs for CCGT Plants, Authors:  Robert Rosario and Dr. Peter Jackson, Power Magazine, April 2016, (Link)

An additional paper by Tetra collaborators Dave Moelling and Andreas Fabricius (and third co-author Jan Rusaas of R&R Consult) has been accepted for presentation at the upcoming Powergen Asia (Tuesday Sept 20th, see details here):  Root Cause Failure Analysis of Superheater Tubes Using Computational Fluid Dynamics Simulations.


Technical Tidbits from Tetra’s HRSG Inspection Planning Guide

HRSG Structures are exposed to weather, hot turbine exhaust gases, steam and water leaks and emissions control chemicals.   Deadweight, wind, thermal and seismic stresses also are applied to the HRSG.  These components are typically inspected on an opportunistic basis, for example during annual statutory inspections by the insurance company’s boiler inspector or during scheduled work on other major components such as the GT.  

Early HRSGs had frequent problems with the duct and casing/liners.  HRSG OEMs have responded to these problems with improved rials, improved bolting patterns and related improvements to designs of other components such as duct burners that have been responsible for damage to liners in certain configurations.

Casing liner plates are often found damaged in the transition duct at the exit of the gas turbine.  This is particularly common in ducts with abrupt geometry changes such as 90° angles in the duct or other sharp angled transitions.  Another common location for liner damage…

Casing Liner Plate Washer Nut Missing

If you are interested in the full version of the HRSG Inspection Planning Guide (2nd edition) contact  Christine Vallon (This email address is being protected from spambots. You need JavaScript enabled to view it. )  or Natalie Vasa (This email address is being protected from spambots. You need JavaScript enabled to view it. )