FIELD OF INVENTION
The invention relates to seismic resistant lugs (SRLs) assembly to absorb seismic forces
experienced by the suspended surface condenser welded to the LP turbine exhaust. More
particularly, the invention relates to Seismic Resistant Lugs (SRLs) Assembly to be an
integral part of the Steam Surface Condenser.
BACKGROUND OF THE INVENTION
The requirement demands that the Steam Surface Condenser needs to be designed
suitably to absorb seismic forces. The Steam Surface Condenser (of approx, 850 MT) is
suspended from the LP Turbine Exhaust hood, which is anchored at the turbine floor.
During seismic condition, the Condenser will tend to oscillate which needs to be
constrained to avoid any kind of disaster at site.
The proposed invention provides for an anchoring system for surface condenser suitable
for integration with turbine, which can withstand seismic forces based on geographical
location.
OBJECTS OF THE INVENTION
The object of the present invention is to propose a surface condenser for condensing the
main steam coming out of LP Turbine, having a robust anchoring system integrated with LP
turbine.
Another object of the present invention is to propose a surface condenser integrated with
LP turbine through an anchoring system, which can withstand specific horizontal seismic
forces.

SUMMARY OF THE INVENTION
The design objectives were translated into a unique combination of following feature:
Use of Seismic Resistant Lugs Assy: The Surface Condenser is 17m in height,- which is
welded to the LP Turbine Exhaust- To resist the condenser from any motion during seismic
load condition and also to allow the Surface Condenser to move due to Thermal Expansion
of the sub-assemblies, during operating conditions, special lug assemblies were designed
to take care of the above condition.
The Seismic Resistant Lugs shall be an integral part of the condenser, connected/welded to
the bottom face of condenser main bottom plate. The lug has been designed for shear load
acting due to horizontal seismic forces. The lug transfers the horizontal seismic forces from
the condenser due to seismic loads to the civil structures on the ground through the robust
I-Beams. The ends of the I-Beams are welded to a plate where a specially designed
lubricated pad is fixed to avoid any metal fusion during operation.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:-
Fig 1 - 3D Model of the arrangement.
Fig 2 - 3D Model of the arrangement on the bottom plate of Surface Condenser.
Fig 3 - 3D Model of the arrangement on the bottom plate of Surface Condenser (Enlarged).
Fig 4 - Position of the lugs in the condenser plate
Fig 5 - Lug assembly with bottom plate and cement concrete interface
Fig 6 - Sketch of I-Beam Assembly

DETAILED DESCRIPTION OF THE INVENTION
The seismic resistant lugs (SRLs) assembly are integral part of the steam surface
condenser welded firmly to the bottom face of bottom plate. These SRLs are not fixed
in the concrete. 2-3 mm air gap is provided between these lugs and the embedment
plate embedded in the concrete. In case of any seismic (earth quake) force, these SRLs
shall hit the concrete and transfer the forces to the concrete (another earth), thus
preventing the condenser and LP turbine assembly away from any damage/
catastrophe.
The lug assembly comprises components as per detail given in figure 5.
Pairs of Axial and Transverse Lug assemblies are welded firmly to the bottom face of
bottom plate as marked in figure 5.
Thus the SRLs become integral part of the surface condenser.
Pair of Axial and Transverse lugs takes care of seismic load in all the direction in
horizontal plane.
The exposed surface of the Teflon pads (4) maintains a gap of 2-3 mm with the
embedment plate (6) which are grouted in the concrete. The air gap and the Teflon
material avoids any metal fusion during long idle operation.

WE CLAIM:
1. A development of Seismic Resistant Lugs assembly (SRLs) to absorb Seismic forces
comprising:
- a lug (5);
- a plurality of I-beam (2) having 1st end welded on either side of lug (5);
- the 2nd end of each I-beam (2) welded to plurality of plate (3) on either side of lug;
plurality of specially designed lubricated pads (4) fixed to the plate (3) which interfaces
the embedment plate (6) on the concrete.
2. The seismic resistant lugs assembly (SRLs) as claimed in claim 1, wherein the lug assembly
(04) is firmly fixed to the bottom face of bottom plate (7) having reinforcing pad (8) being an
integral part of the condenser.
3. The seismic resistant lugs assembly (SRLs) as claimed in claim 1 wherein the lug assemblies
are connected in transverse and axial direction in pairs with the condenser plate which take care of
horizontal loads in all the directions.

4. The seismic resistant lugs assembly (SRLs) as claimed in claim 1 wherein the lug assembly
maintain a gap upto 2-3 mm with the embedment plate (6) which is permanently grouted to the
concrete.
5. The seismic resistant lugs assembly (SRLs) as claimed in claim 1, where the pads (4) are
made of Teflon material which has lubricating property and avoids metal fusion during operation.
6. The seismic resistant lug assembly (SRLs) as claimed in claim 1 where the material of lug (5)
and plate (3) are carbon steel, I-beam (2) of structural steel and pad (4) are Teflon.

ABSTRACT

The invention relates to development of seismic resistant lug assembly (SRLs) which
absorb seismic forces experienced by the suspended surface condenser welded to the LP
turbine exhaust. The seismic resistant lugs assembly, which are fixed to the bottom face of
bottom plate of condenser through reinforcing pad consists of lug welded on to the I-Beam
on either side having end plate and specially designed lubricated pads that interfaces the
embedment plate fixed on to the concrete thus absorbing the horizontal seismic load in all
direction.