FIELD OF INVENTION
The present invention relates to an improved device of gate testing to test
operational parameters of Power Plant. More particularly, the invention relates to
the trial operation and performance testing of an improved guillotine gates which
are used for the flow isolation of flue gas, hot or cold air flow in the ducts of
power plants.
BACKGROUND AND PRIOR ART OF THE INVENTION
Guillotine gates are isolation devices in the ducts and are used for isolating the
flue gas, hot or cold air flow in the ducts of power plants where any media such
as products of combustion, products of mixing or products of reaction are
regulated or dammed in gaseous form. All the sizes and weights of the gates
used for this application can be tested in this device, These gates are having
blades which moves up and down. The sprocket and actuator assembly drives
the blades. Limit switches are provided for controlling the position of the gates.
The leakages are prevented with metallic seals with air seal arrangement.
These gates are to be tested for the free movement of blades and for the
specified operating parameters, which are part of product specification. During
operation, the movement of gates are in vertical position and hence they are to
be tested in vertical position only.

However, for manufacturing convenience, these gates are assembled at shop in
horizontal position.
The gates are to be tested for the following parameters.
1. Trial Operation Testing - Free movement of blades (in the form
friction/interference) and abnormal noise.
2. Checking the performance of the actuator.
3. Inspection of Sealing arrangements.
4. Geometry
Any rectification / rework noticed during the inspection will be carried-out in the
assembled condition and with rigid clamping arrangements without disturbing
the electrical connections.
DISADVANTAGES OF THE EXISTING ART
Earlier the gates were hanged in vertical position using mobile crane, This crane
used to be held for testing one gate through-out the testing period of 3 to 4
days.
Only one gate is being tested at a time using one crane.
Crane operator, rigger and cranes are engaged fully till completion of the testing.

Movement of gates are not smooth due to improper alignment.
To carry-out any rework/rectification work, the gates are once again to be
brought to horizontal position with proper support on the floor.
Inspection near the gates at different heights are not possible during testing.
It is also highly unsafe operation, since the gates are hanged on the crane
without any support /clamping.
Further, providing electrical connection is difficult and the wires hang unsafely.
Separate inspection platforms with ladders are provided for inspection.
In view of the above difficulties, the productivity is low, the quality is poor,
unsafe working condition, failure in meeting customer commitment and hence
resulted for customer dissatisfaction. Hence there exists a need to find a device
of gate testing which eliminates the disadvantages of prior art.
OF THE INVENTION
Therefore it is an object of the invention to propose an improved device of gate
testing to test operational parameters of Power Plant which eliminates the
disadvantages of prior art.

Another object of the invention is to propose an improved device of gate testing
to test operational parameters of Power Plant which is capable of testing four
gates simultaneously and thus improve productivity.
Yet another object of the invention is to propose an improved device of gate
testing to test operational parameters of Power Plant which engages the crane
only for mounting and dismantling operations for four gates.
A further object of the invention is to propose an improved device of gate testing
to test operational parameters of Power Plant which ensures safety during
inspection.
A still further object of the invention is to propose an improved device of gate
iesting to test operational parameters of Power Plant which is capable of
carrying out minor rework/rectification work without removing the gates from the
fixture.
SUMMARY OF THE INVENTION
A cubicle structure is fabricated using rolled steel sections. The base of the
structure is grouted with deep foundation to have rigidity. Platforms are provided
at 4 elevations for easy inspection, rectification works etc. The fabricated steps
with hand-rail arrangement are given for easy climbing and going to the
inspection platforms at different levels. Twin channel welded construction is
given for clamping the gates rigidly using specially fabricated clamps. The

bottom of the gates are rested on machined and leveled fitter bar to ensure
perfect verticality. An electrical control room is provided inside the cubicle
structure for the operation of the gates.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1(A) - shows the gate testing device according to prior art
Fig. 1 (B) - shows rectification/rework position according to prior art
Fig. 2 (A) - show the plan view of gate testing according to the invention.
Fig. 2 (6) - shows the elevation view of gate testing according to the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION.
As shown in Fig. 1, according to prior art the gate (1) is hanged from crane
hook (2) for testing. The bottom of the gate is resting on the floor (4). The drive
actuator (5) is connected by loose cables (6). The crane (3) is permanently
stationed till the completion of the testing.
During rectification/rework , the gate (1) is positioned in horizontal position with
the help of supports (7), which are placed on the floor (4).

Fig. 2 shows the erected cubicle structure, the position of the platforms,
clamping arrangement, position nf the leveled fitter bars with plan and elevation,
according to invention.
As shown in Fig. 2 (A) and 2(B) the fabricated cubicle structure (C) is erected on
the concrete foundation (8), Leveled Fitters' Bars (11) are erected on the floor,
around the vertical structure to ensure the verticality of the gates. Inspection
platforms (9) are provided at different elevations of the structure for easy
approach. The inspection platforms (9) are provided with handrails tor the safety
of the operation and inspection persons. Fabricated steps are provided for
climbing on the gate testing fixture and reaching the platform at different levels.
Innovative new types of rigid fabricated clamps (13) are provided at different
elevations for the fixing of the gates rigidly to the sfructure in vertical position,
The gates (12) are clamped at 4 faces of the structure. The electrical control
room (10) is positioned at the bottom of the structure.
In the present invention as shown in Fig. 2(A) 4 gates (12) are mounted on four
sides of the structure (C) and the base is resting on the leveled fitters bar (11) to
ensure verticality. The gates are clamped rigidly at 3 levels with 2 clamps at each
level for each gate. Electrical connecting points are available at each level.
Advantages of the present method off testing with this fixture are,
1. Highly safe operation, since the gates are clamped rigidly on the
structure. Safety in the inspection and rectification work are

ensured due to the provision of platforms at different ieveis,without
removing the gates from the fixture.
2. Productivity improvement - 4 gates shall be tested simultaneously.
Inspection and rectification is quicker and electrical connections
for the operations are made easily.
3. One crane can be used for the mounting and dismantling operation
for 4 gates,instead of one crane used through-out the testing time for
one gate in the earlier method. Further in this method the crane
can be used for other operations also, since the crane is not required
during the testing time.

WE CLAIM:
1. An improved device of gate testing to test operational parameters of Power
Plant comprising:
a fabricated cubical structure (c) erected on thejconcrete foundation (8);
a plurality of leveled fitter's bar (11) erected onpie floor for ensuring the
verticality of the gates (2);
a plurality of inspection platforms (9) being provided at different
elevations for easy approach; and
a plurality of rigid fabricated clamps (13) being provided st different
elevations for fixing the gates (12) rigidly to the structure in vertical
position;
characterized in that four gates are mounted on four sides of the structure (c)
for carrying out test simultaneously having the base resting on the leveled filters
bars (11) for ensuring verticality when the said gates are clamped rigidly at three
levels with two clamps at each level for each gate.
2. An improved device of gate testing as claimed in claim 1, wherein the gates
(12) are clamped at four faces of the structure (8).
3. An improved device of gate testing as claimed in claim 1, wherein only one
crane is operated for mounting and dismantling operation for four gates.

4. An improved device of gate testing as claimed in claim 1, wherein fabricated
steps are provided for climbing on the gate testing fixture and reaching the
platform (9) at different levels.
5. An improved device of gate testing as claimed in claim 1, wherein handrails
are provided in the inspection platforms (9) for the safety of the operation and
inspection persons.
6. An improved device of gate testing as claimed in claim 1, wherein an
electrical control room (10) is positioned at the bottom of the structure (c).
7. An improved device of gate testing as claimed in claim 1 wherein electrical
connecting points are provided at each level of the structure (c).

An improved device of gate testing consists of a fabricated cubical structure (C) erected on the concrete foundation (B). Levelled filters'bars (11) are erected on the floor for ensuring the verticality of the gates (12). Inspection platforms are provided at different elevations for easy approach. Rigid fabricated clamps
(13) fixes the gates (12) at different elevation. Four gates (12) are mounted in
four sides of the structure (C) wherein the base rests on the leveled filters'bars (11). The gates (12) are clamped rigidly at three levels with two clamps at each level for each gate. Four gates are tested simultaneously when one crane operates only for mounting and dismandling operations of four gates (12). An electrical control room (10) is provided at the bottom of the structure (C).