Title of Invention	A TURBINE DRAIN DEVICE FOR DRAINING OF CONDENSATE
Abstract	The invention relates to a turbine drain device for draining of condensate comprising; a body or shell (001) which encompasses the fluid; the body (001) having an inlet aligned to an inlet piping from the turbine, and an outlet at right angle to the inlet pipe; a yoke (004) connected to the body (001) either by gasket bolting or welding; a Seatring (002) made of hard material in cast form, which is firmly held onto the body (001); a Stem(009) which has one of an integral seating and profiles for determining the area of flow permitted in the downstream stages. The Seatring (002) comprises a diverging area which determines the three stage throttle area for expansion of the medium, and in that an adjustable leak-prevention means (010,011,016,017 & 021) is provided to arrest leakage of the medium through the gland region.

Title of Invention

A TURBINE DRAIN DEVICE FOR DRAINING OF CONDENSATE

Abstract

The invention relates to a turbine drain device for draining of condensate comprising; a body or shell (001) which encompasses the fluid; the body (001) having an inlet aligned to an inlet piping from the turbine, and an outlet at right angle to the inlet pipe; a yoke (004) connected to the body (001) either by gasket bolting or welding; a Seatring (002) made of hard material in cast form, which is firmly held onto the body (001); a Stem(009) which has one of an integral seating and profiles for determining the area of flow permitted in the downstream stages. The Seatring (002) comprises a diverging area which determines the three stage throttle area for expansion of the medium, and in that an adjustable leak-prevention means (010,011,016,017 & 021) is provided to arrest leakage of the medium through the gland region.

Full Text	FIELD OF INVENTION The invention generally relates to draining of saturated water which by virtue of getting drained directly to a flash tanker at near vacuum conditions is subjected to flashing of the medium resulting in damage to the downstream parts by erosion of the high velocity stream. The invention, in particular relates to high pressure drain valves. More particularly, the invention relates to isolating cum draining devices known as multi-stage Turbine drain or Angle drain devices. BACKGROUND OF INVENTION Flow control devices oftenly called Valves are used for high pressure drop or blow-down service. These devices generally follow an angle pattern which is often the most opted type for the application and layout purposes. One of the applications of such devices is in area where very high pressure drop is normally encountered, and such a device is then as high pressure dropping isolation device. The valves can further be used for draining of media. The purpose of the drain valve more specifically in a drain line is to drain the condensate in the line which has accumulated at the time of tripping or low load or other reasons which may result in the formation of the condensate. The condensate is to be removed from the line before loading the turbine for the reason that any water particle or wet steam impinging on the turbine blade will result in heavy damage to the turbine blades as well as the intermediate equipments. During normal operation of the power plant the subject drain valve is to be kept in leak tight closure condition so that the wastage of steam which is indirectly wastage of power generated is avoided. Before loading the turbine, the valve is opened and then condensate drained and then the closed at the time of loading the turbine. In a normal Globe or Single Stage valve when saturated water is exposed to very low pressure regions, the water flashes down to steam causing heavy sound and vibration. The harmful effect of erosion of downstream and similar deterrent effects are a perennial problem in such installations. Conventionally a Globe Valve is used for draining of the condensate from the turbine line. The conventional Globe Valve is characterised by a through port where the fluid passes in its traditional right-turn path thereby undergoes a pressure drop characterised by the valve. For saturated water, a slight pressure drop results in steam formation thereby resulting in heavy increase in the downstream volume, which causes severe choking or blocking in the discharge of the valve reducing the Valve capacity. Also, a typical globe valve is having a single stage control only and the outlet tank pressure largely influences the flow to be handled by the valve. The result will be a severe erosion of the downstream piping of the valve ends. The seat also gets damaged in this valve which results in heavy loss of steam & power. The disc get eroded rapidly which calls for repeated servicing of the valve. OBJECTS OF THE INVENTION It is therefore an object of the invention to propose a multistage draining device for high pressure drop, which would cause limited/low flashing. Another object of the invention is to propose a multistage draining device for high pressure drop, which would protect the valve disc from erosion. A still another object of the invention is to propose a multistage draining device for high pressure drop, which minimizes loss of steam and power. SUMMARY OF INVENTION Accordingly, there is provided a turbine drain device for draining of condensate comprising; a body or shell which encompasses the fluid; the body having an inlet aligned to an inlet piping from the turbine, and an outlet at right angle to the inlet pipe; a yoke connected to the body either by gasket bolting or welding; a Seatring made of hard material in cast form, which is firmly held onto the body; a Stem which has one of an integral seating and profiles for determining the area of flow permitted in the downstream stages. The Seatring comprises a diverging area which determines the three stage throttle area for expansion of the medium, and an adjustable leak-prevention means is provided to arrest leakage of the medium through the body. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING Fig. -1 cross-sectional view of a multi-stage draining device according to the invention. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION. Figure - 1 illustrates a turbine drain device of the invention. The device comprising a body (001) or shell encompassing the fluid, said body (001) having an inlet aligned from an inlet piping turbine and an outlet at right angle to the inlet pipe; a yoke (004) connected to the body (001) either by gasket bolting or welding, the Yoke (004) housing the bottom ears of Gland Bolting; a Seatring (002) which is held onto the body (001) firmly by means of welding; a Stem cum Disk (009) is provided, which is made of single rod and having profiles below its seating portion, the disk (09) having an increasing area below the seatring (002) corresponding to the increasing volume of the liquid being controlled. The seating portion mates with a matching taper seat in the body (001), and made-of Stellite in which the medium pressure expands and loses velocity; a Gland consisting of set of packings (021), a bridge type Gland Flange(OlO) which is used for applying pressure to the Packing (0021) through a Gland Follower(Oll); at least two numbers of Studs(016) including corresponding Nuts(017) for arresting the leakage through the gland (011) in which the Studs (16) pass through the hole of the Gland Flange (010) including the ear hole in the Yoke (004) and are held by two nuts (017) on either side and which facilitates adjusting of the leakage by tightening the gland nuts (017). WE CLAIM 1. A turbine drain device for draining of condensate comprising: - a body or shell (001) which encompasses the fluid; - the body (001) having an inlet aligned to an inlet piping from the turbine, and an outlet at right angle to the inlet pipe; - a yoke (003) connected to the body (001) either by gasket bolting or welding; - a Seatring (002) made of hard material in cast form, which is firmly held onto the body (001); - a Stem(009) which has one of an integral seating and profiles for determining the area of flow permitted in the downstream stages; characterized in that the Seatring(002) comprises a diverging area which determines the three stage throttle area for expansion of the medium, and in that an adjustable leak-prevention means (010,011,016,017 & 021) is provided to arrest leakage of the medium through the gland region. 2. The device as claimed in claim 1, wherein the adjustable leak-prevention means comprises a set of packing (021), a gland flange (010) for applying pressure to the packing (021) via a gland follower (Oil), and at least two studs with corresponding nuts (016,017). 3. The device as claimed in claim 1, comprising an orifice to allow expansion of the medium without causing the medium to choke. 4. The device as claimed in claim 1, wherein the stem (009) comprises a material capable to withstand high pressure jet. 5. The device as claimed in claim 1, wherein the device is configured to posses a self alignment to provide necessary sealing between the seating of the Seatring (002) and the Stem (009). 6. The device as claimed in claim 1, wherein the gland packing (021) comprises pure graphic packing which arrests leakage through the gland. 7. A turbine drain device for draining of condensate as substantially described and illustrated herein with reference to the accompanying drawings. The invention relates to a turbine drain device for draining of condensate comprising; a body or shell (001) which encompasses the fluid; the body (001) having an inlet aligned to an inlet piping from the turbine, and an outlet at right angle to the inlet pipe; a yoke (004) connected to the body (001) either by gasket bolting or welding; a Seatring (002) made of hard material in cast form, which is firmly held onto the body (001); a Stem(009) which has one of an integral seating and profiles for determining the area of flow permitted in the downstream stages. The Seatring (002) comprises a diverging area which determines the three stage throttle area for expansion of the medium, and in that an adjustable leak-prevention means (010,011,016,017 & 021) is provided to arrest leakage of the medium through the gland region.

Full Text

FIELD OF INVENTION
The invention generally relates to draining of saturated water which by virtue of
getting drained directly to a flash tanker at near vacuum conditions is subjected
to flashing of the medium resulting in damage to the downstream parts by
erosion of the high velocity stream. The invention, in particular relates to high
pressure drain valves. More particularly, the invention relates to isolating cum
draining devices known as multi-stage Turbine drain or Angle drain devices.
BACKGROUND OF INVENTION
Flow control devices oftenly called Valves are used for high pressure drop or
blow-down service. These devices generally follow an angle pattern which is
often the most opted type for the application and layout purposes. One of the
applications of such devices is in area where very high pressure drop is normally
encountered, and such a device is then as high pressure dropping isolation
device. The valves can further be used for draining of media.
The purpose of the drain valve more specifically in a drain line is to drain the
condensate in the line which has accumulated at the time of tripping or low load
or other reasons which may result in the formation of the condensate. The
condensate is to be removed from the line before loading the turbine for the
reason that any water particle or wet steam impinging on the turbine blade will
result in heavy damage to the turbine blades as well as the intermediate
equipments. During normal operation of the power plant the subject drain valve
is to be kept in leak tight closure condition so that the wastage of steam which is

indirectly wastage of power generated is avoided. Before loading the turbine, the
valve is opened and then condensate drained and then the closed at the time of
loading the turbine. In a normal Globe or Single Stage valve when saturated
water is exposed to very low pressure regions, the water flashes down to steam
causing heavy sound and vibration. The harmful effect of erosion of downstream
and similar deterrent effects are a perennial problem in such installations.
Conventionally a Globe Valve is used for draining of the condensate from the
turbine line. The conventional Globe Valve is characterised by a through port
where the fluid passes in its traditional right-turn path thereby undergoes a
pressure drop characterised by the valve. For saturated water, a slight pressure
drop results in steam formation thereby resulting in heavy increase in the
downstream volume, which causes severe choking or blocking in the discharge of
the valve reducing the Valve capacity. Also, a typical globe valve is having a
single stage control only and the outlet tank pressure largely influences the flow
to be handled by the valve. The result will be a severe erosion of the
downstream piping of the valve ends. The seat also gets damaged in this valve
which results in heavy loss of steam & power. The disc get eroded rapidly which
calls for repeated servicing of the valve.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to propose a multistage draining device
for high pressure drop, which would cause limited/low flashing.

Another object of the invention is to propose a multistage draining device for
high pressure drop, which would protect the valve disc from erosion.
A still another object of the invention is to propose a multistage draining device
for high pressure drop, which minimizes loss of steam and power.
SUMMARY OF INVENTION
Accordingly, there is provided a turbine drain device for draining of condensate
comprising; a body or shell which encompasses the fluid; the body having an
inlet aligned to an inlet piping from the turbine, and an outlet at right angle to
the inlet pipe; a yoke connected to the body either by gasket bolting or welding;
a Seatring made of hard material in cast form, which is firmly held onto the
body; a Stem which has one of an integral seating and profiles for determining
the area of flow permitted in the downstream stages. The Seatring comprises a
diverging area which determines the three stage throttle area for expansion of
the medium, and an adjustable leak-prevention means is provided to arrest
leakage of the medium through the body.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Fig. -1 cross-sectional view of a multi-stage draining device according to the
invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION.
Figure - 1 illustrates a turbine drain device of the invention. The device
comprising a body (001) or shell encompassing the fluid, said body (001) having
an inlet aligned from an inlet piping turbine and an outlet at right angle to the
inlet pipe; a yoke (004) connected to the body (001) either by gasket bolting or
welding, the Yoke (004) housing the bottom ears of Gland Bolting; a Seatring
(002) which is held onto the body (001) firmly by means of welding; a Stem
cum Disk (009) is provided, which is made of single rod and having profiles
below its seating portion, the disk (09) having an increasing area below the
seatring (002) corresponding to the increasing volume of the liquid being
controlled. The seating portion mates with a matching taper seat in the body
(001), and made-of Stellite in which the medium pressure expands and loses
velocity; a Gland consisting of set of packings (021), a bridge type Gland
Flange(OlO) which is used for applying pressure to the Packing (0021) through a
Gland Follower(Oll); at least two numbers of Studs(016) including
corresponding Nuts(017) for arresting the leakage through the gland (011) in
which the Studs (16) pass through the hole of the Gland Flange (010) including
the ear hole in the Yoke (004) and are held by two nuts (017) on either side and
which facilitates adjusting of the leakage by tightening the gland nuts (017).

WE CLAIM
1. A turbine drain device for draining of condensate comprising:
- a body or shell (001) which encompasses the fluid;
- the body (001) having an inlet aligned to an inlet piping from the
turbine, and an outlet at right angle to the inlet pipe;
- a yoke (003) connected to the body (001) either by gasket bolting
or welding;
- a Seatring (002) made of hard material in cast form, which is firmly
held onto the body (001);
- a Stem(009) which has one of an integral seating and profiles for
determining the area of flow permitted in the downstream stages;
characterized in that the Seatring(002) comprises a diverging area
which determines the three stage throttle area for expansion of the
medium, and in that an adjustable leak-prevention means
(010,011,016,017 & 021) is provided to arrest leakage of the
medium through the gland region.

2. The device as claimed in claim 1, wherein the adjustable leak-prevention
means comprises a set of packing (021), a gland flange (010) for applying
pressure to the packing (021) via a gland follower (Oil), and at least two
studs with corresponding nuts (016,017).
3. The device as claimed in claim 1, comprising an orifice to allow expansion
of the medium without causing the medium to choke.
4. The device as claimed in claim 1, wherein the stem (009) comprises a
material capable to withstand high pressure jet.
5. The device as claimed in claim 1, wherein the device is configured to
posses a self alignment to provide necessary sealing between the seating
of the Seatring (002) and the Stem (009).
6. The device as claimed in claim 1, wherein the gland packing (021)
comprises pure graphic packing which arrests leakage through the gland.
7. A turbine drain device for draining of condensate as substantially
described and illustrated herein with reference to the accompanying
drawings.

The invention relates to a turbine drain device for draining of condensate
comprising; a body or shell (001) which encompasses the fluid; the body (001)
having an inlet aligned to an inlet piping from the turbine, and an outlet at right
angle to the inlet pipe; a yoke (004) connected to the body (001) either by
gasket bolting or welding; a Seatring (002) made of hard material in cast form,
which is firmly held onto the body (001); a Stem(009) which has one of an
integral seating and profiles for determining the area of flow permitted in the
downstream stages. The Seatring (002) comprises a diverging area which
determines the three stage throttle area for expansion of the medium, and in
that an adjustable leak-prevention means (010,011,016,017 & 021) is provided
to arrest leakage of the medium through the gland region.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=9ro/cAQBPgLeevbodGbSkA==&loc=wDBSZCsAt7zoiVrqcFJsRw==

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Patent Number

272501

Indian Patent Application Number

887/KOL/2008

PG Journal Number

15/2016

Publication Date

08-Apr-2016

Grant Date

05-Apr-2016

Date of Filing

14-May-2008

Name of Patentee

BHARAT HEAVY ELECTRICALS LIMITED

Applicant Address

REGIONAL OPERATIONS DIVISION (ROD), PLOT NO: 9/1, DJBLOCK 3RD FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA-700091, HAVING ITS REGISTERED OFFICE AT BHEL HOUSE, SIRI FORT, NEW DELHI-110049

Inventors:

#	Inventor's Name	Inventor's Address
1	KRISHNAMOORTHY SAKETHARAMAN	BHARAT HEAVY ELECTRICALS LIMITED, TRICHY
2	KRISHNASAMY NAGARAJAN	BHARAT HEAVY ELECTRICALS LIMITED, TRICHY
3	DAKSHINAMOORTHY KRISHNAMURTHY	BHARAT HEAVY ELECTRICALS LIMITED, TRICHY
4	KARUPPU UDAYAR ARUNACHALAM	BHARAT HEAVY ELECTRICALS LIMITED, TRICHY

PCT International Classification Number

F16T 1/34

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA