In the multi-stage turbines range, Belliss offers back pressure turbines (up to 15 MW), straight condensing turbines (up to 20 MW) and extraction cum condensing turbines (up to 15 MW). Belliss has over 1200 multistage installations around the world. Belliss also offers very low pressure turbine which can be used for deriving power from the exhaust steam of up to 1.5kg/cm2 for additional power output and increasing the overall efficiency of the plant.

Back Pressure Turbines: These are turbines in which the exhaust pressure is above atmospheric pressure. Back Pressure Turbines are most widely used for process Steam applications. These are commonly found at refineries, district heating units, pulp, paper plants and sugar plants.

Condensing Turbines: Inside a condensing turbine, the steam expands below the atmospheric pressure and then "condenses while heating the cooling water in the condenser. In a Straight Condensing Turbine, the total steam that enters the turbine goes to the condensor and no steam is taken out from any stage in between the turbine.

Extraction Condensing Turbines: In an Extraction type turbine, steam is released from in between the stages of the turbine depending upon the industrial process needs. There are two types of Extraction Turbines;

a). UnControlled Extraction or Bleed Turbine: In this type of turbine, the extraction pressure depends on the flow to the exhaust of the turbine. When the extraction pressure is above the process pressure, the pressure control valve can maintain the required process pressure but if it falls, then the process pressure cannot be maintained.

b). Controlled Extraction or Pass Out Turbine: In this type of turbine, process pressure is controlled by means of a Control Valve called the Pass through Valve fitted inside the casing (between the HP and LP Casings). The Pass Through Valve is controlled by the turbine Governor to maintain the extraction pressure, upstream of the Pass Through Valve -  constant.

Turbine                                   Power Rating            Stages       Type

BTM-B5000                             4,023HP/3,000KW       07             Back Pressure

BTM-B3500/C3500                  4,023HP/3,000KW        04             Back Pressure

BTM-B6600/B6601                  3,000HP/2,200KW        03             Back Pressure

BTM-B4500/B4501                  10,730HP/8,000KW      05/06         Back Pressure

BTM-B5600/B5601                  17,500HP/13,000KW    05/06         Back Pressure

BTM-C5600/CE5600/CB5600    5,370HP/4,000KW        07              Condensing

BTM-C6100/CE6100/CB6100    8,050HP/6,000KW        08              Condensing

BTM-B3550/B3700/B3701         8,050HP/6,000KW       07/07/06    Back Pressure

(BTM-B3701 is designed for high inlet parameters of 64kg/cm2g and 490degC)

BTM-LC6300/LC8000                5,800HP/4,300KW       03      Low Pr Condensing