Articles

Role of Boiling Mode and Rate in Formation of Waterside Deposits in Heat Recovery Steam Generator Evaporator Tubes

Waterside Deposits in evaporator tubes have been an issue in steam generators as long as boilers have been used. Substantial experience in deposit formation and management has been gained in conventional goal and oil/gas boilers over time. The role of boiling modes in the steam generator tubes is very critical to areas of deposit formation. 

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ASME B31.1 Covered Piping Systems' Mandatory Requirements

Since 2007, the ASME B31.1 Power Piping Code has included mandatory requirements on the Operation and Maintenance (O&M) of Covered Piping Systems (CPS), previously called High-Energy Piping.  The main concern is that the safety of these systems is very dependent on good O&M, which justifies its inclusion in the Construction Code.  There is room for flexibility depending on individual circumstances but the responsibility is squarely laid on the Operating Company.

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2019 Summer Power Seminars

On the French Riviera, June 10-14, 2019

Partners: TG Advisers, USA; Prof. B Leckner, Chalmers University of Technology

A unique opportunity to update your knowledge on your power plant’s Capital Equipment. Hear from industry-leading experts on Gas Turbines, HRSGs, Fluidised Bed Boilers and Steam Turbines. Sharpen your skills with the latest information on inspecting, analysing and maintaining your critical power generation assets.

Tetra Engineering has partnered with turbine experts TG Advisers Inc., and Fluidised Bed Boiler expert Prof. B. Leckner (Chalmers University of Technology, Sweden) to deliver a comprehensive course set, targeted at O&M engineers with critical technical responsibilities. The programme will run as follows:

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Impact of Startup Purge Credit on Combined Cycle Plant Operation

Normal boiler and Heat Recovery Steam Generator Operation have required a complete purge of the boiler by fresh air before startup firing to remove potentially explosive fuels and other substances from the boiler/HRSG. For power plants in daily two-shift cycling (or more frequent starts) this not only adds time to the startup sequence but can impose significant thermal stresses on hot components exposed to cooler purge air. 

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Grade 91 Piping Risk Assessment

Higher demands on outlet steam conditions has led to increased use of modified low alloy materials (9-12% Cr), such as Grade 91. The superior high temperature material properties of these types of steels (strength, fatigue resistance, creep resistance, improved steam oxidation resistance) gives the designer advantages with respect to boiler reliability and thermal performance. The advantages of using this type of materials are many; however, the long-term integrity has been a concern to the industry ever since the first installations.

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