Steam Seal Cond
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STEAM SEALING CONDENSERS
TECHNICAL DESCRIPTION The preassembled kit use a vacuum generated by a Venturi tube fied by medium or low pressure steam usually available as surplus from other auxiliaries system. It is possible to use a vacuum pump powered by an electric motor to obtain the required vacuum if prefered by customer. The steam coming from steam turbine extremity seals is diverted into an under vacuum heat exchanger sized in accordance with ASME VIII-1 or to meet special requirements of the final installation country on customer request. Condensing steam is collected in a suitable tank instead of being exhausted from the machine as polluted steam. The skid is completed whit manometers, inlet steam Y filter and a steam regulating valve before the ejector. A pressure switch is also provided for customer control room interconnection for detection of loss of vacuum. Steam turbine running without Gland Condenser Figure 1 shows how steam coming from seals can migrate and condense in the bearing lube oil system causing degradation of lube oil characteristics. Pollution due to the release of toxic vapours containing additives from the machine is also shown.
• eliminate lube oil contamination due to condensing water migration into the oil from the seals and achieve longer operational life before oil change. SELECTION AND OPTIONS Two options are available to the customer. 1) use of a steam driven ejector to obtain the needed vacuum 2) use of a vacuum pump driven by an electric motor. In the first case the system must supply the necessary steam conditions (pressure, temperatures and flow) for the ejector. The size of the Gland exchanger (figure 3) is selected based on the type of steam turbine because seal steam flow has already been calculated for each model. SCOPE OF SUPPLY Complete preassembled skid (for figure 2a version) consisting of: • Steam ejector • Gland condenser exchanger • Gland condenser supports • Condensate tank (50 lt) capacity • Motive steam inlet Y filter • Motive steam regulating valve • Motive steam manometer
Us
STEAM STEAM TURBINES TURBINES
INTRODUCTION The Gland Sealing and Leak-Off System is currently required on all new steam turbines by API 612 (American Petroleum Institute) fourth edition June 1995 to increase the quality of installations. A complete preassembled kit to update steam turbines designed in accordance with the previous API version and not equiped with this system is described here.
CM&
Steam turbine running with Gland Seal System Figures 2a and b present two configurations of the Gland Sealing System (use of a steam ejector or refrigerated vacuum pump and eletric motor). The figures show how water migration to the lube oil system is eliminated and contamination of the lube oil by steam leakage is avoided. APPLICATION The system can be used on all back pressure and condensing steam turbines including those of other manufacturers and can be installed near the turbine skid. BENEFITS The Gland And Vacuum Seal System is able to: • eliminate steam vapours around the machine which are usually toxic due to additives found in the machine • reduce the humidity around the machine resulting in safer operation of all electric devices installed in the area
GE Power Systems Oil & Gas
CM&Us
TU/VA05-9/2002
STEAM SEALING CONDENSERS • • • •
• • • • • • • • •
Vacuum manometer Vacuum pressure switch Vent and drain valves on water side of exchanger Drain valve on condensate tank
Complete preassembled skid (for fig 2b version) consisting of: • Vacuum pump with self cooling • Electric motor with terminal strip
Coupling Coupling guard Gland condenser exchanger Gland condenser supports Condensate tank (50 lt) capacity Vacuum manometer Vacuum pressure switch Vent and drain valves on water side of exchanger Drain valve on condensate tank
To Vacuum
AIR
Steam air Water inlet outlet
Vent
Drain
AIR
Condensate outlet
Water inlet
Figure 3
Figure 1
Figure 2a
From low pressure steam
Figure 2b Vent to atmosphere
Vent Cooling water outlet
Cooling water inlet
Drain
Condensate outlet
Condensate tank Condensate sludge drain
Nuovo Pignone S.p.A. via F. Matteucci, 2 - 50127 Florence (Italy) Tel. +39-055-423-211- Fax +39-055-423-2800 E-mail: [email protected] www.gepower.com/geoilandgas
Cooling water outlet
Vent
Cooling water inlet
Drain
Water outlet Water inlet Condensate outlet
Condensate tank Condensate sludge drain
COMK/MARK 715/II- Studio Tre Fasi - 9-2002 ©2002 Nuovo Pignone S.p.A. all rights reserved
Figure 2
TECHNICAL DESCRIPTION The preassembled kit use a vacuum generated by a Venturi tube fied by medium or low pressure steam usually available as surplus from other auxiliaries system. It is possible to use a vacuum pump powered by an electric motor to obtain the required vacuum if prefered by customer. The steam coming from steam turbine extremity seals is diverted into an under vacuum heat exchanger sized in accordance with ASME VIII-1 or to meet special requirements of the final installation country on customer request. Condensing steam is collected in a suitable tank instead of being exhausted from the machine as polluted steam. The skid is completed whit manometers, inlet steam Y filter and a steam regulating valve before the ejector. A pressure switch is also provided for customer control room interconnection for detection of loss of vacuum. Steam turbine running without Gland Condenser Figure 1 shows how steam coming from seals can migrate and condense in the bearing lube oil system causing degradation of lube oil characteristics. Pollution due to the release of toxic vapours containing additives from the machine is also shown.
• eliminate lube oil contamination due to condensing water migration into the oil from the seals and achieve longer operational life before oil change. SELECTION AND OPTIONS Two options are available to the customer. 1) use of a steam driven ejector to obtain the needed vacuum 2) use of a vacuum pump driven by an electric motor. In the first case the system must supply the necessary steam conditions (pressure, temperatures and flow) for the ejector. The size of the Gland exchanger (figure 3) is selected based on the type of steam turbine because seal steam flow has already been calculated for each model. SCOPE OF SUPPLY Complete preassembled skid (for figure 2a version) consisting of: • Steam ejector • Gland condenser exchanger • Gland condenser supports • Condensate tank (50 lt) capacity • Motive steam inlet Y filter • Motive steam regulating valve • Motive steam manometer
Us
STEAM STEAM TURBINES TURBINES
INTRODUCTION The Gland Sealing and Leak-Off System is currently required on all new steam turbines by API 612 (American Petroleum Institute) fourth edition June 1995 to increase the quality of installations. A complete preassembled kit to update steam turbines designed in accordance with the previous API version and not equiped with this system is described here.
CM&
Steam turbine running with Gland Seal System Figures 2a and b present two configurations of the Gland Sealing System (use of a steam ejector or refrigerated vacuum pump and eletric motor). The figures show how water migration to the lube oil system is eliminated and contamination of the lube oil by steam leakage is avoided. APPLICATION The system can be used on all back pressure and condensing steam turbines including those of other manufacturers and can be installed near the turbine skid. BENEFITS The Gland And Vacuum Seal System is able to: • eliminate steam vapours around the machine which are usually toxic due to additives found in the machine • reduce the humidity around the machine resulting in safer operation of all electric devices installed in the area
GE Power Systems Oil & Gas
CM&Us
TU/VA05-9/2002
STEAM SEALING CONDENSERS • • • •
• • • • • • • • •
Vacuum manometer Vacuum pressure switch Vent and drain valves on water side of exchanger Drain valve on condensate tank
Complete preassembled skid (for fig 2b version) consisting of: • Vacuum pump with self cooling • Electric motor with terminal strip
Coupling Coupling guard Gland condenser exchanger Gland condenser supports Condensate tank (50 lt) capacity Vacuum manometer Vacuum pressure switch Vent and drain valves on water side of exchanger Drain valve on condensate tank
To Vacuum
AIR
Steam air Water inlet outlet
Vent
Drain
AIR
Condensate outlet
Water inlet
Figure 3
Figure 1
Figure 2a
From low pressure steam
Figure 2b Vent to atmosphere
Vent Cooling water outlet
Cooling water inlet
Drain
Condensate outlet
Condensate tank Condensate sludge drain
Nuovo Pignone S.p.A. via F. Matteucci, 2 - 50127 Florence (Italy) Tel. +39-055-423-211- Fax +39-055-423-2800 E-mail: [email protected] www.gepower.com/geoilandgas
Cooling water outlet
Vent
Cooling water inlet
Drain
Water outlet Water inlet Condensate outlet
Condensate tank Condensate sludge drain
COMK/MARK 715/II- Studio Tre Fasi - 9-2002 ©2002 Nuovo Pignone S.p.A. all rights reserved
Figure 2
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