Speeches include:

Operational Flexibility of Gas Turbine Power Plants

HRSG and SCR Performance Optimization

Stands include: 

AECOM, Adams Valve, A-T Controls, Black & Veatch, Bray, Burns & McDonnell, Clarke, Co-Ax, Conval, Doosan, Emerson, JASC,  SPX, Wood.

Two background documents have now been added:


Turbine  Bypass Valve Suppliers 



Turbine Bypass  Technology and Applications  



Issues to be discussed:


Plug valve sticking


Optimal bypass % range

Reaction time

Materials for LP vs. HP vs. new conditions, such as cycling or ultrasupercritical conditions

Multi-stage pressure reduction to reduce trim wear

Stellite delamination

Flow accelerated corrosion

Maximizing power output


More on Turbine Bypass Valves--We talked to Ory Selzer, manager of application engineering at IMI -CCI. He will not be able to attend the show but did offer some thoughts. We have highlighted decisive factors and issues in red.


“Turbine Bypass Systems are a critical part of every Combined Cycle Power Plant (CCPP). In today’s markets, CCPPs must be flexible, reliable, agile and available. Turbine Bypass Systems are integral to plant startup and plant protection and as such they are one of the most important valve systems in a CCPP.


Some 15 years ago, North American CCPPs began seeing cracking downstream of Turbine Bypass Systems, in the high thermal stress regions where water is injected into the steam to cool it down. What was first met with surprise and shock—a cracked steam pipe—has now become almost a norm at CCPPs. Much is known about how these cracks occur, and IMI CCI has been helping customers reduce, repair and eliminate these cracks by upgrading designs for cycling operation. Ten years ago, even 5 years ago, I would have said that cracking in Turbine Bypass Systems was one of the biggest concerns any CCPP End User/Owner should be worried about at their plant. Today cracking still remains a major concern, but we are learning that one of its root causes is even more concerning—wet steam erosion. 


In a market where startup times are critical and every minute counts, CCPPs are trying to get up to speed (load) as fast as possible, at any cost. One consequence of this need for speed not allowing steam lines to warm up. Inadequate drain designs, improper vent valve sizing, or simply operational protocols lead to the collection of condensation in steam lines during startup.


Condensation production is swept along with the first flows of steam, and in many plants the first place this steam goes is through the HP Turbine Bypass System (in order to get flow to the reheater as quickly as possible to avoid overheating). Water mixed with steam at even modest velocities will cut through almost any metal, including Inconel 718 and stellite 6, two of the stronger materials used in Turbine Bypass valve trims. Erosion leads to leakage, leakage leads to overheating of downstream piping or condensers calling in the desuperheater to spray, thus leading to thermal stress. Do this dozens of time a day and after one year you get the cracking that has plagued the industry for more than a decade. 


Wet steam erosion is a major player in this cracking epidemic. IMI CCI has seen wet steam in numerous CCPPs throughout the world. We understand the need for speed, but we also know the limits of material science and physics. We can help the CCPP End User / Owner / Operator understand, evaluate and ultimately eliminate this problem and avoid the painful cost of repairing cracks, replacing hardware, and forced outages.” 


You can contact Ory Selzer, Manager Application Engineering, IMI CCI. At 949-835-8210 or ory.selzer@imi-critical.com


Relative to IMI activities, the company is very active in combined cycle plants in the U.S. It is also active around the world.


In 2015 IMI CCI® Sri City successfully manufactured its first turbine bypass valves for a 1050 MW supercritical power plant, after the Sri City manufacturing facility successfully passed an audit by the commissioning company. The valves were the first produced in India for a 1050 MW thermal power project.​


The Japanese engineering, procurement and construction company (EPC) for the project chose IMI CCI® Japan to supply eight sets of low-pressure turbine bypass isolation and control valves, each with a capacity of 1050 MW. While the assembly and testing of the turbine bypass valves was undertaken at IMI CCI® Japan, IMI CCI® Sri City was chosen as the manufacturing facility for the valve body (including all welding and desuperheater), fully machined internals and the bonnet.


Both IMI CCI® Japan and IMI CCI® Sri City collaborated closely during the manufacturing cycle to ensure the project was completed and shipped on time, to meet the customer's specification.


Background Data in Coal Fired Boiler Decisions (Free To Power Plants)

Emerson Actuator replacement solves turbine bypass problem

As often as four times a year during winter months, a power plant in Wisconsin would miss a scheduled start of its combined cycle power plant due to malfunctions of the turbine bypass valves. This article describes how the problems were solved by replacing the actuation components on those valves. Revision Date:  10/17/2019

Vector and Wellheads engineering turbine bypass system

This paper has a good flow diagram with valve locations. The turbine bypass system is a very important component in power stations, and of a difficult service too. Revision Date:  9/9/2019

Proper Steam Bypass System Design Avoids Steam Turbine Overheating

The steam bypass system is generally used during the following modes of operation: start-up and shutdown, steam turbine trip, steam turbine no-load or low-load operation, and simple-cycle operation. On start-up, the isolation of the CTG/HRSG from the STG allows the CTG to be placed on load without delay and well before the heat-up and roll-off of the STG. In addition, a faster start-up of the STG is possible since the bypass system provides the capability of close temperature matching between the steam inlet temperature and the steam turbine metal temperature.

BHGE expands ASME Section I portfolio to include liquid Economizer and Thermal Fluid Heater Valves

BHGE announces the expansion of the Consolidated ASME Section I portfolio, to now include 1900 LA1 spring-loaded and 2900 LA1 pilot-operated B&PV code approved liquid safety relief valves as solutions for liquid over-pressure protection for Economizers and thermal fluid heaters.Revision Date:  8/15/2019

BHGE and DARVICO together supply Control Valve Package to World’s Largest IGCC Power Plant

BHGE announces the delivery of the highly engineered, severe service control valve packages to Saudi Aramco’s Jazan Integrated Gas Combined Cycle Power Plant.  Revision Date:  8/15/2019

Valve stem seal selection criteria

For ultra-supercritcal service graphite packing without PTFE and binders is proven to be a low total cost of ownership option. Seals can also be protected by an oxygen inhibitor and be live loaded for protection against thermal cycling Valve stem seal selection criteria, Flow Control, Mar 2017 Revision Date:  8/12/2019

Larsen & Toubro has complete range of valves for ultra-supercritical coal plant

The Indian market accounts for nearly 50% of L&T Valves revenue, and the balance comes from international markets, with the Middle East being the most prominent territory. “We are a one-stop-shop for almost all types of process valves – gate, globe, check, ball, butterfly, and plug valves. We offer these valves in many combinations of size, pressure class, materials, and so on, and we are equipped to provide our clients with almost all their process valves requirements” says N.V. Venkatasubramanian (Venkat), Chief Executive and Director. “Further, L&T Valves also offers a complete range of valves for the power industry. In fact, we are one of the few companies that can offer all valves and accessories required for an ultra-supercritical thermal power station.” “Custom-engineered solutions for defence and aerospace applications form an important part of our portfolio. The experience that we gain from working in these sectors has helped us to improve our product quality, strengthen our processes and expand our knowledge base.” Revision Date:  8/12/2019