Valves

Globe ValveGate Valve Check Valve Blow-down Valve

Gate Valve Check Valve Reheating Isolating Device

Gate Valve Check Valve Elbow type Blow-down Valve

Forged Steel Valves

Cast SteelMedium Pressure Valves

Cast SteelHigh Pressure

Valves

Globe Valve

Globe Valve

VALVE PRODUCTS

Silencer

High Pressure By-pass Valve

Quick Closing Non-Return Valve

Soot Blower

VALVE PRODUCTS

Safety ValveSafety Relief Valve

X-Mas Tree Assembly

VALVE PRODUCTS

Full Bore Gate Valve

Well-Head Assembly

TECHNOLOGY BASETECHNOLOGY BASE High Pressure Gate, Globe Toa Valve Co. Ltd.,

Japan

and Non-Return Valves

Quick Closing Non-Return Toa Valve Co. Ltd., Japan

valve

Safety & Safety Relief Valves Dresser Ind. Inc., USA

Forged Steel Valves Dresser Ind. Inc., USA

Soot Blowers Copes Vulcan, USA

HP-LP Bypass Systems SULZER (CCI), Switzerland

Oil Field Equipments Kvaerner National, USA

What is a Valve

Valves are mechanical devices specially designed to direct, start, stop, mix or regulate the flow, pressure, or temperature of a process fluid, valves can be designed to handle either liquid or gas applications.

TYPES OF VALVES – FLOW , PRESSURE

FLOW CONTROL :

• GATE, GLOBE & CHECK VALVES

PRESSURE CONTROL :

• PRESSURE RELIEVING VALVES

• CONTROL VALVES

HOW TO SPECIFY A VALVE

What Parameter?

MAIN PARAMETERS TO SPECIFY

1. TYPE OF VALVE

2. SIZE

3. MATERIAL

4. RATING (Pressure & Temperature)

5. END CONNECTION

6. OPERATION

TYPE OF CONVENTIONAL VALVES

1. GATE VALVE

2. GLOBE VALVE

REG. GLOBE

PISTON LIFT

3. CHECK VALVE SWING

CHECK

SIZEIDENTIFIED BY

NOMINAL PIPE SIZE (NPS)

OF THE PIPING ON WHICH

VALVES ARE MOUNTED.

BHEL MANUFACTURES FROM

0.25” to 36”

MATERIAL

MATERIAL

UPTO TEMP

2”

FORGE

2”

CASTCOMPOSITION

CARBON STEEL 425 A105 WCB / WCC C-Mn-Si

ALLOY STEEL 550 F 22 WC6 / WC9¼ Cr. - ½ Mo

2¼ Cr-1-Mo

STAINLESS STEEL

550 F316 CF8 / CF8M18 Cr-8 Nl

16Cr-8Nl-2Mo

A217-C12A DEVELOPED FOR SUPER CRITICAL BOILER APPLICATION

RATING MAXIMUM PERMITTED PRESSURE OF MEDIUM

WITH RESPECT TO TEMPERATURE FOR A MATERIAL GIVEN IN ASME B16.34

RATINGS DENOTED BY CLASS NUMBERS.

BHEL MANUFACTURES

FORGED VALVE IN CLASS 800,1500,2500 & 3000 spl

CAST VALVES IN CLASS 150,300,600,1500,2500,3500

?ASME CLASS ASME CLASS ?

END CONNECTION

VALVE ASSEMBLY MOUNTED

ON PIPELINE BY FOLLOWING MEANS

1. SOCKET WELD ENDS

2. SCREWED ENDS

3. FLANGED ENDS

4. BUTTWELD ENDSFOR 2”

FOR 2”}

}

OPERATION HAND WHEEL OPERATION

GEAR OPERATION

MOTOR OPERATION

DESIGN STANDARDS

API 600 GATE API 602 GATE ASME B16.34 ALL VALVES BS 1414 GATE BS 1873 GLOBE BS 1868 SWING CHECK

OTHER STANDARDS

ASME B16.10 END TO END ASME B16.5 FLANGED END ASME B16.25 BUTT WELD END ASME B16.11 SOCKET/THREADED ASME B16.47 LORGE DIA FLANGES ASME B1.1 UNIFIED INCH SCREW ASME B36.10M STEEL PIPES

INSPECTION AND TESTING STANDARD

API 598 GATEBS 6755 PART 1 GATE , GLOBE &SCVASME B16.34 GATE, GLOBE &SCV

PRODUCT RANGE-GATE 150C 2” TO 36” 300C 2” TO 20” 600C 2” TO 12” 800C 0.25” TO 2” 900C 4” TO 8” 1500C 2.5” TO 18” 2500C 2” TO 18” 2850C 20”

PRODUCT RANGE-GLOBE

C 300 2” TO 8”C 600 3” TO 4”C 800 0.25” TO 2”C 1500 2.5” TO 4’C 2500 2.5” TO 6”C 3000 Spl 0.25” TO 2”C 3500 2.5” T0 3”

PRODUCT RANGE-SCV

C 150 2” TO 8” &24”C 300 2” TO 12” &16”C 1500 2.5” TO 14”C 2500 2.5” TO 18”

PRODUCT RANGE-PLNRV

C 800 0.25” TO 2” C 1500 0.25” TO 2”C 2500 0.25” TO 2”C 3000 Spl 0.25” TO 2”

Forged Valve :

Medium Pressure

Gate Valves

Globe Valves

Check Valves

Forged Valve :

High Pressure

Globe Valves

Check Valves

Cast Steel Bolted Bonnet Valves :

Gate Valves

Globe Valves

Check Valves

High Pressure – Pressure-Seal Bonnet Valves :

Gate Valves

Globe Valves

Check Valves

Difference between Gate & GlobeGATE VALVE GLOBE VALVE

CONSTRUCT OPEN/CLOSE BY A WEDGE/GATE OPEN/CLOSE BY A PLUG/DISCUSAGE FOR OCCASIONAL OPEN/CLOSE FOR FREQUENT OPERATION

FOR OPEN/CLOSE ONLY REG. GLOBE VALVES USED FOR REGULATION DUTY

LIFT LIFT IS MORE. LIFT IS LESS(~ D/4)

FORCEOPERATING FORCE/TORQUE IS LESS

OPERATING FORCE/TORQUE IS MORE.

OPERATION OPERATION TIME IS MORE OPERATION TIME IS LESSPR.DROP PRESSURE DROP IS LESS PRESSURE DROP IS MORE

SIZESPOPULAR IN ALL SIZES. SPECIFICALLY HIGHER SIZES.

RESTRICTED TO SMALLER SIZES ONLY.

SPECIALITIES• Sealed Gland Arrangement SG• By-Pass Valve Arrangement BPV• Pressure Relieving Arrangement PRV• Limit Switch Arrangement LS• Balance Hole Arrangement BH• Locking Arrangement LO• Indicator Arrangement INDICATOR • Drain Hole Arrangement DRAIN HOLE

IN OPERATION

Chain Wheel Operation CHAIN

Extension Spindle Operation EXTN

SPECIALITIES

ELECTRICAL ACTUATORSELECTRICAL ACTUATORS

For For

VALVE OPERATIONVALVE OPERATION

Type of actuatorsType of actuators

1.1. Hydraulic actuatorsHydraulic actuators2.2. Pneumatic actuatorsPneumatic actuators3.3. Electric actuatorsElectric actuators

Hydraulic actuatorsHydraulic actuators Hydraulic actuators are compact, fast acting and

delivers high torque. But these actuators require complete hydraulic system and cleanliness.

These are used where there is a requirement of quick response and compactness.

Pneumatic actuators Pneumatic actuators Pneumatic actuators are compact and fast acting.But torque developed is very low, sufficient only for small

valves. For other valves need torque amplification system. Because of fast action used for control application of small

valves.

Electric ActuatorsElectric Actuators Electric Actuators are simple, develop high torque,have

good operating speed. With electronic controls these actuators become robust,easy

to install and operate. These are also compatible to modern plant control systems.

Type actuating movement Multi turn Actuators Part turn actuators Linear Actuators

Multi-Turn actuatorMulti-Turn actuator An actuator which transmits torque to the valve

for one or more revolution.

Part-turn actuator Part-turn actuator An actuator which transmits torque to the valve

for less than one revolution.

Linear ActuatorLinear Actuator An actuator which transmits torque to the valve

With linear motion.

ELECTRICAL VALVE ACTUATORS

All critical valves in a power plant are operated by an electrical Actuator from remote control room. These include :

•Main steam stop valves

•Feed discharge valves

•HP heater isolating valves

•Continuous blow down valves

•Emergency blow down valve

•Start up vent valve

•Steam & feed water drain valve

•Extraction line valve

Types of Motor Operated Valves

Actuator without Integral Starter

Motor OperatedActuators

Actuator with Integral Starter

Actuator with Electronic

Integral Starter

Actuator with Smart

Integral Starter

CONSTRUCTION

Actuator is an electro mechanical equipment consisting of

•Motor

•Gear box

•Control compartment

•Hand wheel and De-clutch lever

•Thrust base

•Terminal box

MANUAL OPERATION

For emergency manual operation of valve during power failure the hand wheel provided in the actuator is coupled to the output shaft by means of a declutch lever. Once power supply is restored the hand wheel automatically gets disengaged.

Actuator without Integral starterFor Torque <= 100 Kg M

Actuator without Integral starterFor Torque > 100 Kg M

SPECIAL FEATURES

•Inbuilt starter

•Explosion proof / frame proof

•Non-intrusive type

•Two wire system

Actuator with & without Integral starter

Integral starter of an actuator

INTEGRAL STARTERActuator with integral starter consists of following items.

Reversing contactor

Overload relay

Stop / open / close push button

Local remote selector switch

Monitoring relay

Interposing relays for remote operation

415V / 110V step down transformer

Fuses on primary & secondary circuits.

ELECTRONIC POSITION TRANSMITTER (EPT)

Input -> 0 - 100 ohm

Output -> 4-20mA

System -> 2 wire or 4 wire

Supply -> 24V DC

Provided for inching duty regulating valves.

Development / Supply of Two Wire Control System for Thermal stations.

Two Wire Control system is being supplied to NTPC-Talcher (for the first time in power plant environment in India), comprising the following .– 60 Channel Master Station with hot standby.– PakTester– PakReader– Non-Intrusive actuators with field control units

This system enables faster communication with DCS system, quicker & accurate fault identification apart from enormous saving in cable cost.

Two Wire Control System

Two Wire Control System

POSITION SEATING

All GATE valves of size 100mm & above and Pressure rating 1500 C and above shall be set for POSITION SEATING . i.e., valve closing shall be by CLOSE POSITION limit switch trip only.

The close Torque limit switch to be connected as Back –up / Parallel connection.

Valve Opening shall be by OPEN POSITION Limit switch trip.

TORQUE SEATING

All other GATE,GLOBE and REGULATING valves shall be set for TORQUE SEATING only. i.e., valve closing shall be by CLOSE TORQUE limit switch trip only.

The close position limit should NOT be connected as back –up / parallel connection.

Valve Opening shall be by OPEN POSITION Limit switch trip.

For all Gate valves the during initial 5% opening, of the valve from its close position, the OPEN TORQUE LIMIT SWITCH should be bypassed to ensure smooth opening of the valve.

Thermostat and Over load relay (OLR) should be connected to the motor control circuit.

Actuator setting are to be done as per the above recommendations and set to the recommended opening and closing torque values ,other wise it can lead to valve jamming.

For actuator wiring and torque /position limit switch setting refer wiring diagram 4.V.MISC. 90721 Rev 11 indicated in the O&M.

At the time of Commissioning:

All valves gland to be tightened to arrest gland leak.

Hot tightening of all High pressure valves Bonnet retainer to arrest Self Sealing Bonnet leak after attaining Max pressure & temperature.

Attend to all critical valves involved in Steam Blowing and Acid cleaning.

- Check for Seat damage and re-lap.

- Replace Gland Packing

- Replace SW Gasket

- Ensure Actuator settings as per recommendation.

At the time of annual over-hauling: Replace Gland Packings

Replace Body-Bonnet joint SW gasket, Hinge pin Gaskets

Lapping of damaged Seating surfaces in Body,Wedge/Disk.

Replace Pressure Seal Bonnet Gasket (Soft Iron/ Grafoil)

Hot tightening of all High pressure valves Bonnet retainer to arrest Self Sealing Bonnet leak to be ensured after attaining Max pressure & temperature.

In Motorised Valves check for settings in the actuator as per original recommendations.

All valves are to be attended at least once in TWO years.

1. Gland leakage Tightened Gland bolts evenly, as soon as leakage is noticed and arrest it.

Additional packing shall be added, if necessary (at the next available shut down).

If leakage persists, packing shall be replaced with new set of packing.

2. Body bonnet joint leakage. (SW gasket)

Tighten the bolts sequentially. If the leakage still persists, replace the SW gasket.

Also ensure that the sealing surface is intact.

3. Pressure seal bonnet/ Hinge Pin leak in high pressure valves. In pressure seal design, sealing effect is achieved by the medium pressure only.

TO ensure effective sealing, self sealing bonnet nuts are to be fully tightened in

cold condition and to be retightened after achieving full operating pressure.

Also bonnet nuts are to be retightened again when maximum operating

temperature is achieved as temperature variations can cause relaxation of

bonnet nuts.

4. VALVE PASSING

Valve passing is mainly because of damaged sealing surfaces.

It is due to entrapment of foreign particle between wedge / disc and

body seat.

It is to be attended by lapping of both the body and wedge / disc seat.

It is preferable to attend the valves immediately after steam blowing,

in case the valves are involved during steam blowing operation

Contd…

SPARES DESCRIPTION GV GLV CV CATEGORY

BODY BONNET GASKET COMMISSIONING

GLAND PACKING COMMISSIONING

STEM/SPINDLE MAINTAINENCE

WEDGE/DISC MAINTAINENCE

YOKE BUSH MAINTAINENCE

HINGE PIN GASKET MAINTAINENCE

GV - GATE VALVE GLV - GLOBE VALVE CV - CHECK VALVE

N.A. - NOT APPLICABLE

Thank you

Quick Closing Non-Return Valve

(QCNRV)&

Cold Reheat Line Non-Return Valve

(CRHNRV)

QUICK CLOSING NON RETURN VALVE

Function:

Quick Closing Non Return Valves are standard non return valves equipped with power cylinders, ensuring rapid and positive closing to prevent any reverse flow into the turbine.

Cold Re-Heat Non Return Valve also does the same function but opens & closes by power cylinder as per the system requirement.

Application

QCNRVs are used in turbine extraction lines to the heater and deaerator.

CRH- NRVs are used in cold reheat line from HP turbine to reheater.

Both QCNRV and CRH-NRVs are closed by power cylinders on the initiation of turbine trip, when the forward flow ceases.


RANGE OF VALVES

VALVE TYPE SIZE

CLASS RATING

150 300 600 900

QCNRV

3”

6”

8”

10”

12”

14”

16”

20”

24”

32”

CRH NRV 18”

24”

32”

BONNET

BODY

ARMDISC

AIR/OIL CY LINDER

SEAT(STELLITED)

(STELLITED)

GASK ET

NUT



OPERATION

Power cylinder energised through oil / air to keep the flap free to open when there is flow.

Power cylinder de energised to forcibly close the valve by the spring force.

The flap opening is max. 35 deg. in QCNRV and85 deg. in CRHNRV.

Position indicators are provided to indicate the valve flap position.

QCNRV PHOTO


210 MW 500 MW

VALVENB mm

NP

class

QTY

Nos

NB

mm

NP

class

QTY

Nos

CRH NRV 450 600 1 800 600 1

QCNRV 200 300 2 500 300 4

QCNRV 300 150 2 500 150 2

QCNRV 400 150 2 400 300 2

QCNRV 600 150 2


GO TO

Maintenance

Maintenance Check: (Recommended per shift)1. Disc arm assy. swinging freely.2. On line Test operation of the cylinder.3. Position transmitter and limit switch function.4. Steam leakage to be checked at :

• Stuffing box/ gland packing.• Spiral wound gasket area.

Annual Maintenance 1. The bushes and bearings are to checked. Any abnormality noticed requires

replacement of these components.2. The claw portion of the Spindle and arm are to checked for any crack.3. The stellite surface of the spindle to be checked for any abration.4. Asbestos/Graphite packing area on the spindle are to be checked for any

pitting.5. In the cylinder all the O’rings, piston rings and packings are to be checked

for leaking .


Recommended Spares

• Gaskets for valves and actuators

• Packings for valves and actuators

• Spiral Wound Gaskets for valves

• O’ rings for actuators

RECOMMENDED SPARES

SL No. SPARES DESCRIPTION CATEGORY

1 BODY BONNET GASKET COMMISSIONING

2 SIDE BONNET GASKET COMMISSIONING

3 GLAND PACKING COMMISSIONING

4 SPINDLE MAINTAINENCE

5 DISC, ARM MAINTAINENCE

6 BUSH MAINTAINENCE

SAFETY SAFETY

AND AND

SAFETY RELEIF SAFETY RELEIF

VALVESVALVES

SAFETY VALVES:

A valve, which automatically discharges fluid to atmosphere so as to prevent a pre-determined safe pressure being exceeded.

It is generally used for compressible fluids such as steam and other gases which demand quick over-pressure relief.

SAFETY & SAFETY RELIEF VALVES

SB

SS

RS

RB

PRESSURE RELIEF VALVES

CLASSIFICATION OF PRVs :

(A) SV- Safety Valves (1700 & 1811 SERIES)

(B) RV- Relief Valves

(C) SRV - Safety Relief Valves (1900&1990 SERIES)

Applications of SV, RV & SRV

DescriptionSafety Valve

(SV)

Relief Valve

(RV)

Safety Relief Valve

(SRV)

Applicable Fluids

Compressible Media

Vapors & Gases like steam, air etc

Incompressible Media

All liquids like water

acts as SV in compressible medias and acts as RV in incompressible medias

OpeningPop Action (Sudden opening)

Opening is proportional to the excess pressure over the set pressure

Pop action in compressible medias and proportional opening in incompressible medias

Code Requirements

ASME Sec-I & IBR ASME Sec-VIII ASME Sec-VIII

Operating Gap 5% Minimum 10% Minimum 10% Minimum

Blow Down 5% Maximum 15% Maximum 15% Maximum

ApplicationsUtility & Industrials Boilers

Petroleum & Fertilizer

Industries

All applications except boiler drum, SH & RH.

Over Pressure 3% of set pressure 25% of set pressure 10% of set pressure

LEVER

SPINDLE

SPRING

Y OK E

SPG.ADJ USTER

DISC

BODY

DISC HOLDER

GUIDE

CAP

ADJ .RING PINS

UP.ADJ .RING

LO.ADJ .RING

CAP

SPG.ADJ USTER

WASHER

SPRING

SPINDLE

GUIDE

DISC HOLDER

ADJ .RING PIN

ADJ .RING

NOZZLE

BASE

VALVE MODEL QUANTITY REQUIRED

Typical Number of Valves in Power Boilers.

LOCATION 210 MW 250MW 500 MW

1750 WB 3 1 2 DRUM

1740 WB - 2 4 1739 WD - 2 -

S.H.1740 WD 1 - 21786 WB 1 1 -

C.R.H.

1786 WD 3 4 4 H.R.H.1786 WB-10” - - 4

1538 VX-10W 1 2 5 ERV-SH1525 VX-4 - 2 4 ERV-RHTOTAL 9 14 25

SL COMPONENT PARAMETER EFFECT OF ADJUSTMENTS

01 SPRING ADJUSTER

SET PRESSURE CLOCKWISE – INCREASE

COUNTER CLOCKWISE - DECREASE

02 UPPER ADJUSTING RING

BLOWDOWN CLOCKWISE / DOWN – INCREASE

COUNTER CLOCKWISE / UP –

DECREASE

03

LOWER ADJUSTING RING

SIMMER / LIFT COUNTER CLOCKWISE – REDUCE SIMMER AND ENABLE FULL LIFT.

04

OVERLAP COLLAR

BLOWDOWN CLOCKWISE – TO REDUCE.

COUNTERCLOCKWISE - INCREASE.

NOTE : ALL ROTATIONS ARE TO BE MADE AS LOOKING FROM THE TOP OF THE VALVE

COMPONENT NAME SV SRV REQUIREMENTS

DISC COMMISSIONING

ADJ.RING PINS (Lower & Upper) COMMISSIONING

ADJUSTING RINGS MAINTENANCE

SPINDLE MAINTENANCE

DISK HOLDER MAINTENANCE

GUIDE MAINTENANCE

OVERLAP COLLAR N.A MAINTENANCE

N.A - Not Applicable

SOOT BLOWERSSOOT BLOWERS && APPLICATIONSAPPLICATIONS

TYPES OF SOOT BLOWERS APPLICATION

• WALL DESLAGGER - FURNACE WALL

* LONG RETACTABLE SOOT - CONVECTION ZONE BLOWER (SH, RH, LTSH, ECO)

* HALF RETRACTABLE SOOT - CONVECTION ZONE, BLOWER FLUE GAS < 600 DEG. C

* ROTARY SOOT BLOWERS - CONVECTION ZONE, INDUSTRIAL BOILERS, ID FAN (IMPELLER) BANK TUBES, ECO. AIR HEATERS

* AIR HEATERS CLEANERS - ROTARY AIR HEATERS.

* TRAVERSING NON- ROTATING - TUBULER AIR HEATERS

?

WALL DESLAGGER

DESIGN FEATURES - 2 MOTOR DRIVE

MODEL WBIE - EASY ACESSIBILITY FOR MAINTENANCE OF PARTS

- COMPLETE 360 Deg. ROTATION

- FLEXIBILITY TO VARY THE BLOWING TIME

- FLEXIBILITY TO VARY BLOWING ANGLE

- LESS NON - BLOWING TIME

OPERATIONFORWARD TRAVEL -305 MM IN 3 SECS.

ONE ROTATION IN 84 SECS.

RETRACT TRAVEL - 305 MM IN 3 SECS.

TRAVERSE SPEED - 6.1 M / MIN

ROTARY SPEED - 0.7 RPM.

ROTARY GEAR REDUCTION - 2067 : 1

TRAVERSE - 28 : 1

LONG RETACTABLE SOOT BLOWERS

MODELS

SINGLE MOTOR - LRS - I MAX. TRAVEL : 6 MTR.(CHAIN DRIVEN)

DOUBLE MOTOR - LRD - I E MAX. TRAVEL : 7.6 MTR ( CHAIN DRIVEN ) - LRD - I ER MAX. TRAVEL : 7.6 MTR - LRD - I A MAX. TRAVEL : 7.6 MTR - LRD - II E TRAVEL : 7.7 TO 12.2 MTR

GEAR OPERATED - LRS - I ER MAX TRAVEL : 5 MTR

OPERATION

LANCE MOVEMENT -TRAVERSE & ROTARY

TRAVERSE SPEED -1.63 M/MIN (LRD IE)

ROTARY SPEED -5.2 RPM (LRD IE)

MAX CLEANING RADIUS - 2.5 – 2.7M

GEAR REDUCTION (T) -155:1

GEAR REDUCTION (R) - 28:1

OPERATION

ROTARY SPEED - 1.2 RPM

NO OF REVOLUTION - 1

NO OF NOZZLES - AS MANY COILS

NOZZLE DIAMETER - 6 / 8 / 10 MM

OPERATING TIME - 0.82 MIN

GEAR RATIO - 124 : 1

SOOT BLOWER CHECKS

COMMISSIONING CHECKS:

LUBRICATING OIL LEVEL. INTERLOCKS. HAND CRANK AVAILABILITY. DIRECTION OF ROTATION OF MOTORS. OPERATION OF LIMIT SWITCHES. ENSURE STEAM CONDITIONS. BLOWING PRESSURE. STEAM LEAKAGES.

MAINTENANCE CHECKS

ANNUAL CHECKS

REPLACE LUBRICATING OILS.

CHAIN, CHAIN LINKS.

VALVE STEM ASSY.

ROTATION OF LANCE ROLLER ASSY.

BLOWING PRESSURE.

LANCE / NOZZLE DISTANCE.

GO To

MAINTENANCE CHECKS

SHUT DOWN CHECKS

REPEAT ANNUAL CHECKS.

VALVE HEAD SERVICING.

CHECK FOR BOILER TUBES.

BLOWER ADJUSTMENT FOR ANY MISALIGNMENT.

GO TO

Recommended SparesSL DESCRIP[TION LR WB RB TYPE OF SPARES01 GEAR BOX ASSY MAINTENANCE02 MOTOR MAINTENANCE03 SBV HEAD ASSY MAINTENANCE04 VALVE STEM MAINTENANCE05 LIMIT SWITCHES MAINTENANCE06 BEARINGS MAINTENANCE07 GLANDS MAINTENANCE08 OIL SEALS MAINTENANCE09 LANCE ASSY NA NA MAINTENANCE10 SWIVEL TUBE ASSY NA NA MAINTENANCE11 BLOWING ELEMENT NA NA MAINTENANCE12 PACKINGS COMMISSIONING13 GASKETS COMMISSIONING

HPLP BYPASS

SYSTEM

VALVES

HP/LP BYPASS SYSTEM

FUNCTION:

To ensure operation of steam generator by maintaining a minimum circulation of steam flow , when turbine is not in service

ADVANTAGES:

Quick start up of the unit Reheater protection during start - up Parallel operation of steam generator & turbine House load operation Limited safety valve lifting during trip outs Dm water saving

MAINTENANCE CHECKS• EVERY MONTH

• OIL LEVEL

• OPTICAL PR.DROP INDICATOR (RED BUTTON) IN 3 MICRON FILTER

• EVERY 3 MONTHS

• NITROGEN PRESSURE IN ACCUMULATOR

• SYSTEM PRESSURE

• PRESSURE SWITCH SETTING

• AIR FILTER ELEMENT CHECKING

MAINTENANCE CHECKS

• EVERY ANNUAL OVER HAUL

• CONDITION OF SEALING SURFACES OF VALVES

• CONDITION OF ACTUATOR SEALS

• CONDITION OF HYDRAULIC OIL

• PUMP SUCTION STRAINER

• DELIVERY FILTER IN OIL SUPPLY UNIT

• ALL OPERATING PRESSURES IN PRESSURE SWITCH

HP BYPASS AND SPRAY VALVE SPARES

COMPONENT NAME HPBP SPRAY REQUIREMENT PACKING RING COMMISSININGSPIRALWOUND GASKETS COMMISSINING VALVE SEAT MAINTENANCE VALVE STEM MAINTENANCE PRESSURE SEAL PLUG MAINTENANCE JETCAGE MAINTENANCE GLAND BUSH MAINTENANCE GUIDE BUSH MAINTENANCEN.A: NOT APPLICABLE

HP BYPASS HYDRAULIC SYSTEM SPARES

COMPONENT NAME REQUIREMENT FILTER ELEMENTS COMMISSINING ACTUATOR SEALS & ‘O’RINGS MAINTENANCE SERVO VALVE SEALS & ‘O’RINGS MAINTENANCE BLOCKING ELEMENT SEALS & ‘O’RINGS MAINTENANCE OIL SUPPLY UNIT SEALS & ‘O’RINGS MAINTENANCE ACCUMULATOR BLADDER MAINTENANCE FAST OPENING DEVICE SEALS & ‘O’RINGS MAINTENANCE

DIRECT WATER LEVELGAUGE

To indicate

the visible water level

in pressure containing vessel.

CONSISTS OF

1. GAUGE GLASS ASSEMBLY.

2. TIE BAR ASSEMBLY

3. ILLUMINATOR

4. VIEWING HOODS.

GAUGE ASSY

REPAIR PORT ASSEMBLY INSTRUCTIONS

• Assy to be done in a clean atmosphere.

• Glass, mica, gasket shall be handled with its Edges; Faces shall not be touched.

• Incase of leakage, all items (2-5) shall be changed with new one.

FAST OPENING OF HP BYPASS VALVE UNDER:

1. GENERATOR CIRCUIT BREAKER OPENS

2. TURBINE TRIPS

3. TIRBINE LOAD SHEDDING REALY ACTS.

COMMISSIONING / O&M CHECKS

Acid cleaning & installation of oil lines Setting of oil system pressure Flushing with 25micron filter Flushing with 3micron filter Draining of flushed oil Testing of oil for PARAFFIN content Line filters should not be used for flushing Contamination level to be checked

Accreditation

IBR : Well known Tube and Pipe Maker

ISO 9001 : Quality Systems for Boilers, Auxiliaries, Valves, Heat Exchangers, Pressure Vessels and Oil Field Equipment

ISO 9002 : Quality Systems for Manufacture of Seamless Steel Tubes.

Lloyds Register of : Class-I Fusion Welded Pressure Vessel Shipping Manufacture.

NABL : National Accreditation Board for Testing and Calibration laboratory

USA

JAPAN

INDONESIA

KUWAITMALAYSIA

CYPRUS

MALTA

BANGLADESH

VALVES- EXPORT PERFORMANCE

FURTHER PENETRATE into : Middle East, U.S.A., Singapore, Russia(OFE), Iran, Iraq & Canada for enhanced business volume.

SYRIA

GHANA PHILLIPINES

TESTING STD. : API-598DESIGN STD. : API-602

( FORGED STEEL - MEDIUM PRESSURE )

GATE VALVE

WEAR WASHERS STEM WITH DOUBLE ACME THREAD

TWO PIECE GLAND

SPIRAL WOUND GASK ET

FULLY GUIDED WEDGE

HAND WHEEL

STURDY SWING BOLT

DEEP STUFFING BOX

POSITIVE BACK SEATING

RENEWABLE SEATS.

DESIGN STD. : BS-5352TESTING STD. : BS-6755(1)

(FORGED STEEL - MEDIUM PRESSURE )

GLOBE / REG. VALVE

SCREWED SEAT RING

GUIDED STEM-DISC


TWO-PIECE GLAND

HANDWHEEL

FOR REG. VALVE

DISC

DISC NUT

POSITIVE TAPERED BACK SEAT

DEEP STUFFING BOX

STURDY SWING BOLT

THREAD BUSHING

DESIGN STD. : BS-5352TESTING STD. : BS-6755(1)

( FORGED STEEL - MEDIUM PRESSURE )

TOP ENTRY DESIGN.

FORGED BODY & CAP


FULLY GUIDED DISC

RENEWABLE SEAT

CUSHIONED DISC

FLAT SEAT

HIGH STRENGTH BOLT

TESTING STANDARD : API 598, API 6D & ANSI B16.34DESIGN STANDARD : API 600, API 6D & ANSI B16.34

SEAT RINGS

STUFFING BOX

BODY

HAND WHEEL

GREASE NIPPLE

EY E BOLTS

RISING STEM

END CONNECTIONS

WEDGE

STEM

BACK SEAT

GLAND

Y OK E BUSH

END CONNECTIONS

REGULATING DISC

STEM

HAND WHEEL

Y OK E BUSH

DESIGN STANDARD : BS 1873TESTING STANDARD : BS 6755 Part-I

BODYBACK SEAT

DEEP STUFFING BOX

EY E BOLTS

SELF ALIGNING GLAND

TESTING STANDARD : BS 6755 Part-I / API 6DDESIGN STANDARD : BS 1868 / API 6D

BODY

HINGE

HINGE PIN

SEAT RING

DISC

END CONNECTION

DISC STOP

BONNET J OINT

DESIGN STD. : BS-5352/ANSI-B16.34

FULL PENETRATION WELD

DEEP STUFFING BOX.

SPLIT GLAND

RUGGED FLANGE

ALUMINIUM BRONZE BUSHING

( FORGED STEEL - HIGH PRESSURE )

INTEGRAL HARD FACING

FOR REG. VALVE

GLOBE / REG. VALVE

TESTING STD.: ANSI-B16.34

DISC PAD

STAK E LOCK ED DISC NUT

Y OK E ARM

STEM

( FORGED STEEL - HIGH PRESSURE )

CHECK VALVE

TESTING STD. : ANSI-B16.34

DESIGN STD. : BS-5352/ANSI-B16.34

SCREWED AND SEAL WELDED COVER

FULL PENETRATION WELD

BODY

SEAL WELD

FULLY GUIDED DISC

HARD FACING

DISC

SEAT RING

RETAINING RING(NI-PLATING)

GREASE NIPPLE

MECHANICAL STOPPER

Y OK E SLEEVE

HAND WHEEL

Y OK E

BEARING

GLAND FLANGE

GLAND PACK ING

STEM

Y OK E CLAMP PR. SEAL BONNET

BACK SEAT

BODY

SOFT IRON GASK ET

18/8 SS INLAY

BUSHING

SPINDLE

PLUG

LIFTING LUG

CUSHION PLATE

SEAT RING

RETAINING RINGPRESSURE SEALBONNET

DISC

SEAL CONSTRUCTIONDETAIL OF PRESSURE

BODY

NUT

ARM

18/8 SS

SOFT IRON

INLAYGASK ET

BACK

BACK

Thank you

Documents

Valves