News

Tetra In Action - June, 2016

France: June, 2016 - Effective Operation of the HRSG Course

This seminar is primarily intended for O&M staff at all levels of experience working in combined cycle power plants, but should also be of interest to engineers and managers involved in new project development. The course gives attendees a comprehensive yet in-depth survey of a broad range of topics relating to the design, operation and maintenance of the HRSG and associated steam cycle systems.  Drawing on our field experience working at power plants throughout the world, the objective is to provide attendees with clear instruction on the operator actions and design issues that impact HRSG reliability, efficiency and operating life.

The course syllabus can be found here.


Recent Projects: Site Works Survey SE Asia

TETRA Engineering was engaged by a European client to perform a site works assessment at a Southeast Asian power plant construction site. Work had been delayed for months due to disagreements among two parties involved in the project regarding scope of work, responsibility and scheduling issues.
A Tetra engineer visited the site to meet with key personnel from the parties and to inspect the current state of the works. The results of the survey revealed

  • Lack of communication between both parties
  • Delays caused by one party in part of their scope of activity significantly delayed the other party’s progress in the project, causing a large financial loss and deterioration of equipment due to excessive exposure to elements.
  • Discrepancies in the original scope of work caused added delays in the schedule and increasing the level of discord between the two parties
  • As a “neutral” observer, the Tetra engineer was able to identify contradictions in the respective positions of the parties based on actual observations made on site

Corrosion on incomplete boiler assembly Civil Works

Left: Corrosion Due To Inadequate Preservation; Right: Civil Works

 


Technical Tidbits from Tetra’s HRSG Inspection Planning Guide

Analysis of deposits found in the HRSG is a common and very useful way for determining what is occurring on both the waterside and gas side.  Waterside deposits found in the drum are analyzed to determine chemical and elemental composition.  The presence of certain elements such as chlorine might indicate that there is or was a problem with contamination of the boiler water.  Analysis of gas side deposits such as those found on the cold end tubes can identify the various compounds present and their disposition in the deposits.  Excessive cold end deposition results when unit design does not match actual fuel characteristics or from mistuned process conditions.  The deposits are often corrosive and can lead to premature tube failures as well as loss HRSG or boiler performance.

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. )

Tetra In Action - May, 2016

Managing the Power Piping in CCGT Plants

Risk of failure and attendant personnel safety concerns are always present when operating highly-pressurized systems.  Over the years, the occurrence of catastrophic events has driven improvements in construction codes and updated recommendations for O&M practices.  As part of this trend, expanded requirements for operations and maintenance (O&M) were recently added to the ASME Code for Power Piping—ASME B31.1.   The “Chapter VII Operation and Maintenance” was created in 2007 to prescribe guidelines that promoted early failure detection and overall safety. This was a fundamental change to the scope of B31.1, which up until then was strictly a design code; going forward, it now serves a dual purpose…


Read the full story by our colleague Robert Rosario, published in Power Magazine here


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.


Technical Tidbits from the Tetra HRSG Inspection Planning Guide

The inspection of drums is a key element in determining the general condition of the waterside pressure boundary of the HRSG components and the quality of the water treatment program.  They are a “window” on what the inside of the water-filled or steam and water-filled tubes and headers in the various pressure circuits (HP, IP or LP) might look like.  Basic inspection is visual, yet often complemented by UT, and PT/MT examinations.
One of the key items of interest is surface passivation.  The HP drum should typically have a dark grey adherent surface layer, characteristic of magnetite, below the maximum waterline.  Above the maximum water line there may be some light red coloration, indicating a mix of magnetite and hematite.  Yet surface color can deceive,  drums with “abnormal” color may simply reflect a specific water chemistry and process condition history.  The experience of the inspector comes into play in these cases, to decide whether what is observed is indicative of a real problem or simply reflects a harmless difference.

DrumInspector
Figure 1 : Senior Engineer Mark Taylor from Tetra’s European office enjoying some quality Steam Drum time during a recent HRSG inspection campaign.

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. )

Tetra provides services for Cement Industry Heat Recovery Systems

Tetra Engineering provides services to assist Cement Plant Owners and Operators in implementing, maintaining and improving all types of Heat Recovery Systems.    Our Heat Recovery Steam Generator and steam cycle services have been applied to Rotary Kiln Waste Heat recovery power generation systems.   Whether addressing problems with fouling, or assessing plant modifications for performance improvements, contact Tetra to reduce your energy costs and increase reliability.

 

2016 Training Schedule Announced!

Tetra Engineering has announced its schedule for HRSG & Combined Cycle training events in 2016.  This year we will be hosting training courses in Utah and Connecticut, USA, as well as in France and a new event in Dubai, UAE.  See our training page for more details.

Startup Purge Credit Assessment

Tetra Engineering will be presenting our technical paper on "Impact of Startup Purge Credit on Combined Cycle Plant Operation" at the ASME Power and Energy Conversion 2015 Conference in San Diego, California, USA on June 30, 2015. It describes the technical basis for purge credit operation and provides an example of the impact on fatigue lifetime in key Heat Recovery Steam Generator components.

See the full program at the ASME website here.