specifying electric actuators for the power...

2013 VMA Technical Seminar

Specifying Electric Actuators for the

Power Industry

Bill Breitmayer & Justin Ledger

AUMA Actuators Inc.

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Specifying Electric Actuators for the Power Industry

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Agenda:

• Power Industry Update

• Information Required to Properly Select & Size Electric Actuators.

• Typical Applications for Electric Actuators

• Types of Electric Actuators and Controls

• Key Takeaways


EPA regulations may close 200 US coal-fired power units.

204 coal units may be shut down across

25 states representing 31,000 MW of electric

generating capacity.

The states of Ohio, Pennsylvania, West

Virginia, Virginia and North Carolina,

which have total 103 coal units planned for

closure, represent almost 18,000 MW

generating capacity.

Power Technology Sept. 21, 2012

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Power Industry Update


Mitsubishi begins CO2 injection at US carbon capture project

Mitsubishi and the Southern Company have jointly built a carbon

sequestration demonstration system at the Barry Power station in Ala.,

which has a CO² recovery efficiency above 90%.

The largest project of its type, it comprises a flue-gas scrubber, flue-gas

CO² capture/re-generation system, CO² compression machinery and

electrical components.

At the demonstration site, CO² will be sequestered in a saline formation at

a depth of 3,000m to 3,400m (2 mi.) in the Citronelle Dome geologic

structure, which is approximately 12 miles west from the plant.

Power Technology – Sept. 17, 2012

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A survey of coal-fired power plants conducted by the

Environmental Protection Agency found that 209,000

MW out of 329,000 MW of capacity, or 63.5%, had no

scrubbers.

The following table summarizes the findings of the EPA survey:

Scrubber Status Plants without scrubbers

Plants with scrubbers

Total

Number of plants 351 146 497

Number of Generating Units

990 290 1,280

Capacity 209,000 120,000 329,000

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U.S. Energy Information Administration

“According to the EIA, natural gas-fired electricity

generation is expected to account for 80 percent

of all added electricity generation capacity by

2035.”

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Valve and Damper Designs

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Selecting Electric Actuators – Information Required

Valve / Damper Types:

Wedge Gate (Rising, non-rotating threaded stem) Torque Seated.

Parallel Disc Gate (Rising, non-rotating threaded stem) Position Seated.

Knife Gate (Rising, non-rotating threaded stem) Position Seated.

Globe Valve (Rising, non-rotating threaded stem) Torque Seated.

Stop Check Globes (Rising, non-rotating threaded stem) Torque

Seated.

Butterfly Valves

These list represent the majority of the valve types seen in a typical fossil fuel

power plant project. Examples as follows:

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Typical Applications: Globe & Gate Valves

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Typical Application – Butterfly Valves

Motor Operated Butterfly Valves

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Guillotine Dampers

The guillotine damper, or slide

gate damper as it is sometimes

called, has the main function of

isolation of equipment to permit

inspection, maintenance, or

repair in addition to process

Isolation.

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Typical Applications: Dampers



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High Pressure / High Temp. (High Torque) Stop Checks

without Electric Actuators:

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High Pressure / High Temp. (High Torque) Stop Checks with Electric Actuators:



Why Specify Electric Actuators?

So why should we be concerned with specifying Electric Actuators…..

There will be a demand for power which requires:

• Valves

and

• Motor Operators (i.e. Electric Actuators)

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Electric Actuators Typically Used in

Power Plants

Multi-turn, Direct Mount:

Multi-turn Electric Actuator Coupled to a Gear

Unit.

Direct Mount, ¼ Turn Output

(Typically smaller valves)


Multi-turn Electric Actuators

Multi-turn actuators

Definition for multi-turn actuators

according to EN ISO 5210

A multi-turn actuator is an actuator which transmits torque to the valve for more than one complete revolution.

It may be capable of withstanding thrust.

2013 VMA Technical Seminar 22

Part-turn Electric Actuators


Multi-turn actuator/worm gearbox

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Actuators for quarterturn dampers

Quarter-turn actuator

Multi-turn actuator/worm gearbox

multiturn actuator/lever output,

pedestal mount worm gearbox


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Information Required to Properly Size Actuator:

-Voltage and Voltage Variance (IE, Plus 10%, Minus 20%)

-Modulating or Open – Close Application.

-Torque Required (and Max. Thrust if applicable)

-Shaft Diameter (and Thread design if Applicable).

-Operating Time Required.

-Enclosure Classification (NEMA 4X, 7, IP 68)

-Maximum Line Temperature.

-Safety Factor to be applied if applicable.

-Detailed Actuator Specification for the Particular Project.

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An Important Sizing / Selection Consideration Involves High

Temperature, Rising Stem, Torque Seated Valves.

When the Line Temp Exceeds 800

Degrees, a Thermal Compensating

‘Floating’ Stem Nut Design is Warranted.

We often hear that high temperature

Valves are ‘sticking’ in their seats if

This feature is not incorporated.

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Actuator with Spring Loaded Stem Nut – Thermal Compensation Feature


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Types of Motor Controls Typically Used in Power Plants

• Manual

• Intrusive

• Non-Intrusive


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Electric Actuator Motor Controls


Usually consist of:

motor starters

control power supply or transformer

pilot devices / local controls

A positioner is required to accept an analog signal (i.e. 4-20mADC).

A digital communications board is required to communicate via

‘fieldbus’ or ‘two-wire.’

Motor controls can be located:

at the motor (actuator)

at a remote location


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Intrusive Actuator Motor Controls:

Typical Standard features to include in a specification:

Reversing starters

Power supply (115V of 24VDC)

Auto phase correction

Monitor relay

Loss of phase

Thermal trip

Torque trip

Pilot devices / local controls

Standard interface board (24 VDC or 115 V)

NEMA 4X/6 Weatherproof enclosure

Torque and limit Switches enclosed within the Actuator housing



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Intrusive Actuator Motor Controls:

Optional features to include in a specification:

Control interface boards

Positioner (accept analog signal)

Fieldbus Protocols:

PROFIBUS-DP

Modbus RTU

DeviceNet

Accept emergency signal

Overload relays

Solid state starters / Thyristors

High temperature rating

Low temperature rating

Enhanced corrosion protection

Submersible enclosure

Explosion proof

Lockable tamper-proof protection cover

Ability to remote mount the motor controls



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Non-Intrusive Actuator Motor Controls:

Typical Standard features to include in a specification:

Reversing starters

Power supply (24VDC or 115VAC)

Auto phase correction

Monitor relay / fault relay

Standard interface (24 VDC or 115 V contact closure)

Pulse time

Pilot devices / local controls

Enclosure: NEMA 4X/6 Weatherproof enclosure

Electronic Control Unit



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Typical Standard features to include in a specification Cont’d:

Output signals (programmable output relays)

Position

Torque

Fault

Running Open

Running Close

etc

Analog torque feedback

Analog position feedback

LCD display

Electronic nameplate

Wireless Communications via Bluetooth

Ability to generate and store torque curves



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Optional features to include in a specification:

Interface boards which can include:

Adaptive positioner

Process controller PID

Digital communications interfaces

PROFIBUS-DP

Modbus RTU

DeviceNet

Foundation Fieldbus

Accept emergency input signal

Optional reversing starters based on Actuator size

Overload relays

Solid state starters / Thyristors

Additional programmable relays

Voltage Tolerance (i.e. +/- 30% of nominal voltage)



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Optional features to include in a specification Cont’d:

High temperature rating

Low temperature rating

Enhanced corrosion protection

Submersible enclosure

Explosion proof

Lockable tamper-proof protection cover

Ability to remote mount the motor controls


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Key Takeaways

Electric Actuators serve a key role in Power Plants

Specifying the proper actuator features is important

What is the application?

Multiturn

Part-turn

Damper

What are the valve characteristics?

Torque

Thrust

What type of Motor Controls are Req‘d?

Non-Intrusive

Intrusive


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Key Takeaways Cont‘d

What is the Control Interface?

Contact Closure

Analog

Fieldbus

What is the environment?

Nuclear

Weatherproof

Explosion Proof

High Temperature

Low Temperature

Submersible

What is the Primary and Control Voltage?

Are voltage fluctuations of concern?


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Thank you!

Questions?

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