Emerson Bettis Nuclear Series Manual de usuario

Operation and Maintenance Manual

VA065043 Rev. E

June 2014

Bettis Nuclear Series Actuators

Installation and Operation Manual

VA065043 Rev. E

Table of Contents

June 2014

Table of Contents

Section 1: General

Section 2: Storage

Section 3: Installation

Section 4: Start-Up

Section 5: Operation of Emerson Actuator

5.1 Controlled Operation.................................................................................. 5

5.2 Manual Operation....................................................................................... 5

Section 6: Maintenance

6.1 Service Interval ........................................................................................... 6

6.2 Lubrication Requirements........................................................................... 7

Section 7: Spare Parts

Section 8: Document Revision

June 2014

Installation and Operation Manual

VA065043 Rev. E

Section 1: General

General

Section 1: General

All Nuclear qualified actuators have a model number starting with an Nprefix.

In order to ensure and maintain the present level of qualification and auditability

to the Emerson Qualification Report Number VA037274 and VA600529, Emerson

requires that any maintenance or service work be performed by well-trained,

equipped, prepared and competent personnel.

Installation and Operation Manual

VA065043 Rev. E

June 2014

Section 2: Storage

Assembly and Valve Adaptation

Section 2: Storage

For applications where the actuator is not put into immediate service, it is

recommended that the actuator be cycled by clean dry air or nitrogen pressure at

least once a month. Indoor storage, if available, is recommended for all actuators.

Care should be taken to plug the cylinder ports, control valve ports and body ports

to keep out foreign particles and moisture. Also, actuators should not be stored in

an atmosphere harmful to resilient seals. For extended storage, contact the factory.

June 2014

Installation and Operation Manual

VA065043 Rev. E

Section 3: Installation

Installation

Section 3: Installation

1. Since there are many valve and actuator combinations, it is not practical to

include detailed instructions for each type. Mountings are designed to be

as simple as possible to keep guesswork out of installation. Actuators are

shipped from the factory with the travel stops adjusted for approximately

ninety degree rotation. Generally, it is necessary to make slight stop

adjustments once the actuator is installed on the valve. Refer to the valve

manufacturer's recommendations for specific requirements. When the valve

has internal stops, the actuator should be adjusted at the same points.

NOTE:

The actual "stopping" should be done by the actuator. If the valve does not have

internal stops, adjust the actuator to the full-open position. Using this as a reference

point, rotate the valve closed and adjust to the valve manufacturer's specifications for

total rotation.

2. Good instrument practices are also recommended. Clean, dry air or gas is

essential for long-service life and satisfactory operation. It should be noted

that new air lines often have scale and other debris in them. This debris can

damage control valves, solenoids, seals, and others.

Installation and Operation Manual

VA065043 Rev. E

June 2014

Section 4: Start-Up

Start-Up

Section 4: Start-Up

1. When the actuator is first put into service, it should be stroked. This is necessary

because the seals and packings having been stationary, causing them to take

a "set". Therefore, the actuator should be operated through several cycles,

exercising the seals and packings, resulting in a service ready condition.

2. The actuator speed of operation will be determined by a number of factors including:

a. Power supply line length

b. Power supply line size

c. Power supply line pressure

d. Control valve and fitting orifice size

e. Torque requirements of the valve

f. Size of actuator

g. Setting of speed controls

h. Pressure of hydraulic manual override with internal adjustable speed

controls

3. Due to the interaction of these variables, it is difficult to specify a "normal"

operating time. Faster operating times may be obtained by using one or more

of the following:

a. Larger supply lines

b. Larger control valves

c. Higher supply pressure (not to exceed minimum operating pressure

of actuator or control components)

d. Quick exhaust valves

4. Slower operating times may be obtained by using flow control valves to

meter the exhaust. Excessive exhaust flow metering may cause erratic

operation; incoming supply should not be metered.

June 2014

Installation and Operation Manual

VA065043 Rev. E

Section 5: Operation of Emerson Actuator

Operation of Emerson Actuator

Section 5: Operation of Emerson Actuator

5.1 Controlled Operation

Controlled operation is accomplished by pressurizing and depressurizing to the

appropriate cylinder inlet(s) of a double-acting or spring-return unit(s) by means

of an appropriate control valve. Do not exceed pressures indicated on the actuator

nameplate.

5.2 Manual Operation

All pressure must be vented or equalized on both sides of the power piston prior to

manual operation. Lubricate the exposed screw threads with ESLN-6 lubricant, loosen

jam nut and rotate drive screw in appropriate direction to operate actuator and valve.

Installation and Operation Manual

VA065043 Rev. E

June 2014

Section 6: Maintenance

Maintenance

Section 6: Maintenance

6.1 Service Interval

1. Routine maintenance is generally unnecessary. "N"-Series actuators are qualified

with a specific cycle life between service intervals. Six hundred twenty five

(625) cycles or five (5) years is the required service interval for legacy “N”-

Series actuators and three thousand (3,000) or fifteen (15) years for the new

generation “N”-Series actuators. The actuator must be removed from the

valve to perform the required service and maintain qualification. The actuator

must be disassembled, cleaned, wear inspected, all worn parts replaced, re-

lubricated, and all seal/gaskets replaced. Failure to observe required service

intervals will void the qualification of the actuator. It is recommended that

service kits be ordered approximately three (3) months prior to scheduled

maintenance to ensure availability.

NOTE:

Storage time counts as service time.

NOTE:

Legacy actuators include NCB, NHD, and NT Series actuators.

New generation actuators include NCBB, NCBA300 and NG Series actuators.

2. For availability of technicians and equipment to perform required actuator

service, contact Emerson or their authorized nuclear representative.

3. For actuators normally used in nuclear service, all bearing surfaces are gen-

erally coated with a molybdenum disulfide or Ryton coatings and corrosion

inhibitor.

All threaded fasteners, bearing surfaces, tracks, rollers, pins, yoke bores, gas-

kets and seals are coated with the provided ESLN-6.

4. On "NT" Series actuators only, lubricant fittings are provided as a means of

supplemental lubrication of the yoke trunnion bearing surfaces. Lubrication of

the yoke trunnion is accomplished most effectively by applying lubricant while

actuator is in motion. This assures maximum dispersion of the lubricant.

5. If the speed of operation changes, becoming increasingly slower, the supply

line filter should be checked for possible collection of debris.

6. All control valves, filter regulators, positioners, limit switches, and others,

require periodic maintenance. Consult manufacturers operating and

maintenance instructions for their requirements, procedures, and maintenance

intervals.

June 2014

Installation and Operation Manual

VA065043 Rev. E

Section 6: Maintenance

Maintenance

6.2 Lubrication Requirements

For nuclear service, use Emerson provided ESLN-6.

NOTE:

This product is only intended for use in large-scale fixed installations excluded from the

scope of Directive 2011/65/EU on the restriction of the use of certain hazardous

substances in electrical and electronic equipment (RoHS 2).

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