Automated Valves - General

8/11/2019 Automated Valves - General

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Automated valves - General

ON / OFF Valves

Consists of: Valve Body

Actuator

Accessories


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ON / OFF Valves

Common Applications:

Process/Emergency Shutdown.

Sequencing Process Application.

Isolation


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PZ

PT

SEPARATOR

GAS FROM

MANIFOLD GAS

CONDENSATE

RELIEF TO

FLARE HEADER

EQUIPMENT FAILURE

PRESSURE

REMOVED BY SIS

ESD/BDV Valves are the final defense against processdisturbances.


ON / OFF ValvesProcess / Emergency Shutdown Application [SAMPLE]


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ON / OFF ValvesSequencing / Batch Process Application

[SAMPLE: DEHYDRATION PROCESS]

p

DRYING REGEN

DRYINGREGEN


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ON / OFF Valves

MM

Isolation Application [SAMPLE]


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ON / OFF Valves

Selection Considerations:

Application Types: Emergency closing or venting, ON/OFF, Isolation

Pressure: @ shut-off, @ operating

Temperature: Seat material, extension for high / low (cryogenic) temp.

Fluid: Corrosive, Erosive, slurry

Valve Type: Ball (Full / Reduced bore) floating / trunnion mounted, Butterfly,

Gate

Valve Material: Body, Stem, Trim

Actuator: Pneumatic / Hydraulic, Fail Open/Close, Spring return / double

acting, w/ or w/o hand wheel, Speed

Accessories: SOV, LS, QEV, Regulator, Speed controller, etc.

Area Classification: IEC or NEC

Power Supply: SOV Supply, Pressure Supply


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ON / OFF Valves

Valve TypeValve Type shall be selected based on the P&ID.

Ball Valve

Designed based on API 6D

Gate Valve

Designed based on API 600

Butterfly Valve

Designed based on API 609


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ON / OFF Valves

Actuator Type

Pneumatic

Use pressurized gas (air) to power the actuator;

Cheap, Safe and Clean.

HydraulicUse pumped liquid (oil) to power the actuator;

Commonly used when the valve torque is high;

Expensive since we have to provide HPU c/w reservoir &

return line for oil return.

Electric (Motor operated Valve MOV)

Use motor (inside the actuator) to actuate the valve;

Commonly use when pneumatic/hydraulic is not available;

Typically for general Isolation not for Shutdown purpose;

Stroke time @ max 2 minutes.


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PS

S

ENERGIZED

PS

S

DE-ENERGIZED

ON / OFF Valves

Single-Acting Actuator

Either signal or press supply failed, spring force will move the valve at safe state (it can be

Fail Close or Fail Open)

Normally used for ESV / BDV application


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ON / OFF Valves

S

S

PS

PS

OPEN SOLENOID

DE-ENERGIZED

CLOSE SOLENOIDENERGIZED

S

S

PS

PS

CLOSE SOLENOID

DE-ENERGIZED

OPEN SOLENOID

ENERGIZED

Double-Acting Actuator

Either signal or press supply

failed, the valve/ actuatorposition will remain at last

(Fail Last)

Normally used for batch/

sequencing process or

isolation application


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ON / OFF Valves

Actuator Sizing

To be sized @ max shut-off pressure of the valve [ valve torque @

max shut-off pressure]

In case of pneumatic/ hydraulic actuator, it should be sized @

minimum available pneumatic/ hydraulic supply pressure

In case of electric actuator, it should be sized @ minimum

available voltage supply

Safety factor typically > 30%

Stroke Time [ max 2 minutes for MOV and 1 second per 25 mm of nominalsize of valve for pneumatic/ hydraulic actuated valves (with max of 45 seconds)

PTS]


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ON / OFF ValvesActuator Sizing Sample [Case: Fail Close, Single Acting Spring Return Actuator]

The data provided by Valve Manufacturer

Valve torques @ shut-off pressure

The data provided by Actuator Manufacturer

Actuator torques @ minimum pneumatic press supplyCalculated Safety Factors @ > 30%

Safety Factor = Actuator Torque/Valve Torque


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ON / OFF ValvesArrangement with Accessories Sample

IA supply

4.5 ~10 barg

Set @ minimum

as used for

actuator sizing

3-ways

solenoid valve

Bug

Screen

Relief Valve. To protect

actuator against over

pressure.

Quick Exhaust Valve. With

large bore size, it releases

more air to reduce the stroke

time.

Limit switch. Mechanically

linked to the actuator to showvalve position (open/close). As

local indicator and sends

signal to the control system


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ON / OFF Valves

Actuators Mounting on the Valves

Quarter-Turn Valves (Ball / Butterfly)

Refer to ISO 5211


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ON / OFF Valves

Actuators Mounting on the Valves

Multi-Turn Valves (Gate)

Refer to ISO 5210


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ON / OFF Valves(procurement activities - 1 of 2)

CMSB VENDORS CLIENT

Preparation of Spec Approved?

Preparation of

Enquiry Receive enquiry;

Preparation ofQuotation

Receive enquiry;

Preparation of

Quotation

Receive enquiry;

Preparation of

Quotation

Receive quotation;

Evaluation;

Award/PO

SELECTED VENDOR

Prepare engineering doc.

Approved?

Start Fabrication

YES

YES

NO

NO


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ON / OFF Valves(procurement activities - 2 of 2)

Valve

Manufacturer

Actuator

Manufacturer

Accessories

Manufacturers

Assemble

(normally be done @ actuator manufacturer/vendor workshop)

InternalTest

FAT

Delivery /

Shipment

To be done by vendor, internally

To be done by vendor and

witnessed by CMSB and/or Client

Manage by the Selected Vendor


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Documents

Automated Valves - General