Product Solutions

1.Pressure Reducing Desuperheating Stations:

Forbes Marshall offers the most advanced method to reduce pressure and temperature of steam in a single unit called a “PRDS valve”. During the process of pressure reduction in the valve water is simultaneously injected into a highly turbulent zone called the ‘Vena Contracta’. This causes instantaneous evaporation of water for complete desuperheating.

Our complete PRDS stations offer a flange-to-flange solution to reduce pressure and reduce temperature at the same point. These systems are completely redundant, avoiding the potential for shut-down. The station is supplied complete with sensing instruments, controllers, drains, and filters.  We offer a one stop solution to pressure and temperature reduction of superheated steam.

The potential to reduce the degree of outlet superheat is limited by the capability of control system. Almost all desuperheaters are used to reduce the steam (or gas) temperature as close to saturation as possible. The matter of importance is that these units must be controlled precisely to prevent flooding of the whole system. The limitation of the control system is its sensitivity range. Consider a system with a controlled outlet temperature set at 1 Deg.C (33.8 Deg. F)  above the saturation, where the controls are designed to maintain +/- 1 Deg.C (33.8 Deg. F). The cooling water injection into the steam will continue until the temperature falls to saturation.. Then only the controls will reduce the cooling water injection. Due to the delays inherent in the control system (specifically introduction of derivative band) which is not in scope of most desuperheater manufacturers, cooling water will continue to flow at the design rate for a short time. In that small amount of time, the saturated steam will be allowed to condense. Condensing vapour creates a vacuum, which sucks in more vapour, which too continues to condense. This results in loss of control, where downstream equipment may be damaged and the downstream processes may be severely affected. Due to these reasons, we have recommend outlet temperatures be set at 4 – 5 Deg. C (39.2 – 41 Deg. F) above the saturation point. By the time the steam reaches the process point, it’s heat content is still sufficient to provide the required thermal energy.  All FM desuperheating systems are designed with this in mind.

2. Steam Water Analysis System:

In any power plant running on steam, the purity of boiler feed water and steam is absolutely crucial; especially for steam within the steam turbine, steam boiler, super heater, condenser and other related-steam equipment. To prevent damage to equipment often resulting in scaling and corrosion, on line steam and water analysis of critical parameters such as pH, Conductivity, Dissolved Oxygen, Silica, Sodium, Phosphate etc. is required. The steam can be as hot as 560 Deg. C (1040 Deg. F). We have developed fully integrated Steam and Water Analysis Systems (SWAS), which provide precise measurements of such critical parameters. SWAS systems ensure that over time, crucial line equipment is fed high enough quality steam to avoid excessive wear and unscheduled shutdowns. Site references are available upon request.

3. Efficiency Monitoring and Flow-metering:

 

Forbes Marshall offers complete monitoring systems with flow-meters and temperatures sensors as a part of our online Effimax packages. Inefficient Boilers are silently eroding your profits by excessively consuming more fuel than they should. In absence of real time feedback, most plants resign themselves to the belief that they can do nothing more about this. The range of EffiMax Solutions brings back to life the efficiency optimization of boiler houses. Providing accurate real time efficiency data, Boiler house operators and managers can look forward to a new way of running boilers! Lower fuel bills, higher profits, greater plant efficiency. For the first time the benefits of improving the boiler’s total efficiency are available in simple, cost effective packages. No more expensive DCS systems. No more guessing. No more tedious sampling procedures or calculations. EffiMax systems integrate with any boiler on a plug-and-play basis, making efficiency improvements possible.

4. Process Metering:

Krohne Marshall has been a world leader in the field of Process Measurement for more than 28 years. Our complete metering systems are currently utilized on liquids, gases, as well as steam. Our systems offer such advantage as:

• High measuring accuracy & repeatability
• High reliability
• Integral diagnostics
• Long economic lifetime
• Easy and low cost installation
• Low operational costs
• Low maintenance costs
• Rugged and reliable design

 

5. Condensate Cooling in All Steam Applications:

To avoid the need for costly risers venting to the roof of plants and buildings, FM has designed a cost-effective solution to vent condensate, without the need for risers.  Vent-less Condensate Coolers enable hot condensate to be cooled within a steam circuit without the need for vents to atmosphere.

Stainless steel, rugged construction enables coolers to be placed in many environments as a part of the complete steam loops offered by Forbes Marshall. Such units pay for themselves within the first month of use, since the cost of riser installation is