26 35 43-AM0005.pdf

Chrome Plating Facility 100% Design Watervliet Arsenal, Watervliet, NY

SECTION 26 35 43

SILICON-CONTROLLED RECTIFIER

05/11

Amendment 0005

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 1159 (2009) Recommended Practice on Monitoring Electric Power Quality

IEEE C2 (2017; Errata 1-2 2017; INT 1 2017) National Electrical Safety Code

IEEE C62.41.1 (2002; R 2008) Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power Circuits

IEEE C62.41.2 (2002) Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA 250 (2018) Enclosures for Electrical Equipment (1000 Volts Maximum)

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2020) National Electrical Code

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-STD-461 (2015; Rev G) Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment

UNDERWRITERS LABORATORIES (UL)

UL 1012 (2010; Reprint May 2014) Power Units Other than Class 2

UL 1449 (2014) Surge Protective Devices

UL 489 (2016) UL Standard for Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

SECTION 26 35 43 Page 1 AMENDMENT 0005

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. The following shall be submitted in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Silicon-Controlled Rectifier drawings; G RO

SD-03 Product Data

Silicon-Controlled Rectifier; G RO

Remote Control Panel; G RO

SD-06 Test Reports

Work Plan; G RO

Routine Factory Test Plan; G RO

Special Factory Test Plan; G RO

Performance Test Plan; G RO

Test Schedule; G RO

Routine Factory Tests; G RO

Special Factory Tests; G RO

SD-07 Certificates

Qualifications of manufacturer; G RO

UL Listing; G RO

SD-09 Manufacturer's Field Reports

Initial Inspection and Tests; G RO

Performance Tests; G RO

Training Syllabus; G RO

SD-10 Operation and Maintenance Data

Silicon-Controlled Rectifier, Data Package 5; G RO

Preliminary Operation and Maintenance Manuals, Data Package 5; G RO

Remote Control Panel, Data Package 5; G RO

SECTION 26 35 43 Page 2 AMENDMENT 0005

1.3 QUALITY ASSURANCE

1.3.1 Silicon-Controlled Rectifier Drawings

Furnish scaled drawings of enclosure outline including front, top, side views, and overall dimensions. Provide external power and control wiring and bus/cable connections. Provide single line, schematic, and wiring diagrams. Drawings shall include details of input circuit breakers, rectifiers, surge protectors, and control devices. Drawings shall include conduit entry locations and output bus bar connection locations.

1.3.2 Qualifications of Manufacturer

Submit a certification that the manufacturer has a minimum of five (5) years' experience in the design, manufacturing, and testing of silicon-controlled rectifier at the same or equivalent ampere and voltage ratings for direct connection to electrical loads.

The certification shall state that the manufacturer is experienced in manufacturing and testing silicon-controlled rectifiers of equivalent ratings. The manufacturer shall be experienced in producing units for installation in permanent buildings in environmentally closed spaces. The manufacturer shall also document ratings.

1.3.3 Work Plan

Submit a written schedule of dates of routine and special factory tests, installation, field tests, and operator training for the rectifier system. Furnish a list of instrumentation equipment for factory and field test reports.

1.3.4 Routine Factory Test Plan

Submit 3 copies of test plans and procedures at least 21 calendar days prior to the tests being conducted. Provide detailed description of test procedures, including test equipment and setups, to be used to ensure the rectifier meets the performance specification and explain the test methods to be used. As a minimum, the test procedures shall include the tests required under the paragraph entitled "Routine Factory Tests."

1.3.5 Special Factory Test Plan

Submit 3 copies of test plans and procedures with the Routine Factory Test Plan. Provide detailed description of test procedures, including test equipment and setups, used to ensure the rectifier meets the performance specification and explain the test methods used. As a minimum, the test procedures shall include the tests required under the paragraph entitled "Special Factory Tests."

1.3.6 Performance Test Plan

Submit 3 copies of test plans and procedures at least 15 calendar days prior to the start of field tests. Provide detailed description and dates and times scheduled for performance of tests, and detailed description of test procedures, including test equipment (list make and model and provide functional description of the test instruments and accessories) and setups of the tests to be conducted to ensure the rectifier meets the performance specification. Explain the test methods to be used. As a minimum, the test procedures shall include the tests required under the paragraph

SECTION 26 35 43 Page 3 AMENDMENT 0005 entitled "Field Quality Control." Test reports shall include power quality measurement data collected in accordance with IEEE 1159 .

1.3.7 UL Listing

Submit with the initial submittal to verify qualification of manufacturer. Silicon-Controlled rectifier shall be identified with a UL or nationally recognized testing laboratory (NRTL) label prior to shipping.

1.3.7.1 Currently Listed Products

Submit UL or NRTL certification or UL file number for the actual silicon-controlled rectifier to be shipped.

1.3.7.2 Proposed Listed Products

Submit UL or NRTL certification or UL file number for same or similar rating or product size range of like design unit.

1.3.8 Routine Factory Tests Report

Submit within 45 calendar days after completion of tests. Receive approval of test prior to shipping unit. Certify tests were conducted on each rectifier in accordance with the requirements set forth in paragraph entitled "Routine Factory Tests" and certify rectifier satisfactorily operated within specified limits. Report shall include copies of the test procedures, test data, and results.

1.3.9 Special Factory Tests Report

Certify tests were conducted on a rectifier of the same design, construction and ampere and voltage rating to be provided and in accordance with the requirements set forth in paragraph entitled "Special Factory Test" and certify rectifier operated without malfunctioning within specified limits. Report shall include copies of the test procedures, test data, and results.

1.3.10 Performance Tests Report

Submit report of test results as specified by paragraph entitled "Field Quality Control" within 15 calendar days after completion of tests.

Certify tests were conducted on each rectifier in accordance with the paragraph entitled "Field Quality Control" and certify rectifier satisfactorily operated within specified limits. Report shall include copies of the test procedures, test data, and results.

1.4 MAINTENANCE

1.4.1 Operation and Maintenance Manuals

Submit silicon-controlled rectifier operation and maintenance manuals in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA.

1.4.1.1 Additions to Operation and Maintenance Manuals

In addition to requirements of Data Package 5, include the following on the actual silicon-controlled rectifier provided:

a. Routine and field acceptance test reports.

SECTION 26 35 43 Page 4 AMENDMENT 0005

b. UL or NRTL certification or UL file number.

1.4.1.2 Preliminary Operation and Maintenance Manuals

Prior to scheduling Field Performance Tests, 2 copies of a Preliminary Operation and Maintenance Manual must be submitted to and approved by the Contracting Officer.

1.4.1.3 Extra Material

Furnish recommended manufacturer's spare parts list and schedule of prices for each type of rectifier and other equipment specified in this section.

This list shall include the following for silicon-controlled water-cooled rectifiers:

a. Membrane Panel.

b. Solenoid Valves.

c. Circuit Breakers.

d. Resistors.

e. Contactors.

f. Fans.

g. Filters and Driver Boards.

h. Silicon-Controlled Rectifiers (SCR's).

i. SCR Fuses.

j. Thermistors.

k. SCR Grease.

l. Ripple Capacitors.

PART 2 PRODUCTS

2.1 SILICON-CONTROLLED RECTIFIER

Provide new silicon-controlled rectifier consisting of modular construction solid-state components for 60 Hz AC to DC conversion, input/output devices, and ancillary control devices. Silicon-Controlled rectifier shall be a standard product of the manufacturer and shall be the manufacturer's latest design that complies with the specification requirements. All rectifiers provided under this contract shall be products of the same manufacturer. The unit shall have a calculated MTBF exceeding 24,000 hours as calculated when the rectifier is provided with yearly servicing and maintenance. The rectifiers shall be UL or third party listed to comply with UL 1012 . Provide startup and shutdown instructions posted on the front of the unit using engraved plastic plate. Provide a plastic encapsulated schematic diagram attached to the inside of the unit in clear view of maintenance personnel.

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SECTION 26 35 43 Page 5 AMENDMENT 0005

2.1.1 Acceptable Manufacturers

Rect i f i er manuf act ur er must be wel l - known and r eput abl e and wi l l be subj ect t o appr oval dur i ng t he submi t t al s pr ocess.

( Text Del et ed)

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2.1.2 Electrical Characteristics

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2.1.2.1 Input Voltage

480Y/277 V, three phase, four wire, grounded, 60 Hz. Silicon-Controlled rectifier shall provide ripple content equal to or l ess t han 2 per cent of f ul l scal e vol t age out put t hr ough t he r ect i f i er ' s ent i r e oper at i ng r ange ( 10- 100 per cent r at ed vol t age and cur r ent out put ) .

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2.1.2.2 Input Power Factor

Between 0.80 lagging and unity, under all conditions of steady state line and load variations specified herein.

2.1.2.3 Surge Protection

The rectifier shall be capable of sustaining an input surge described in and tested in accordance with UL 1449 , and IEEE C62.41.1 and IEEE C62.41.2 , and continue to operate with no alarms within the specified tolerance.

2.1.2.4 Inrush Current

The inrush current shall not exceed 100 percent of the rated full load input current.

2.1.2.5 Output Voltage

Output voltage and current will be determined by user selection on remote control panels. Defined limits of the specific silicon-controlled rectifiers cannot be exceeded.

2.1.2.6 Power Output

Rectifier output ratings shall be as indicated on the drawings, including polarity reversal functionality as indicated. Output power selection will be determined by the user, but shall not exceed defined output limits for each individual rectifier. Units are rated at 100 percent continuous full load output.

2.1.2.7 Efficiency

The rectifiers shall have a minimum efficiency of 75 percent.

SECTION 26 35 43 Page 6 AMENDMENT 0005

2.1.2.8 Short Circuit

When a bolted line-to-ground fault, a bolted line-to-line fault, or a bolted three phase fault is applied to the unit, unit shall be capable of sustaining the short circuit current indicated on the drawings without damage until the protective device interrupts the fault.

2.1.2.9 Output Ripple

a. Balanced load:

(1) Output voltage THD: Not to exceed 2 percent line-to-line and line-to-neutral for linear loads as specified in the paragraph entitled "Load Range".

2.1.2.10 Cooling Water Flow Rate

Cooling requirements shall be coordinated with available flow rate in the facility, as well as temperature.

2.1.3 Environmental Rating

The rectifier shall operate satisfactorily from no load to rated full load under the following conditions:

a. Ambient temperatures ranging from 10 degrees C to 40 degrees C.

b. Relative humidity from 0 to 95 percent noncondensing.

c. Ambient pressures from sea level to 500 feet .

2.1.4 Monitoring and Control Panel

Provide rectifier with a control panel that is equipped with the following controls, indicators, instrumentation, diagnostics, and alarm functions.

2.1.4.1 Indicators

a. Input power available - Lamp/LED to indicate that the supply voltage is available.

b. Output power On/Off - Lamp/LED to indicate that the rectifier output voltage is available.

c. System alarm - Lamp/LED to indicate that a fault has been detected.

This indicator shall be latched in the "ON" position whenever an alarm condition described in paragraph entitled, "Alarm Annunciator," is detected and shall remain "ON" until the alarm reset pushbutton is pressed.

d. Mode indicator- indicate the operation mode of the rectifier.

2.1.4.2 Instrumentation

a. Elapsed time meters (amp hours).

b. Output voltmeter selector with adjustment options.

c. Output ammeter selector with adjustment options.

SECTION 26 35 43 Page 7 AMENDMENT 0005

2.1.4.3 Alarm Annunciator

The unit shall be capable of detecting the following abnormal conditions, sounding an audible alarm and illuminating individual indicator lamp/LEDs that are clearly identified:

a. Input overvoltage.

b. Input undervoltage.

c. Output undervoltage.

d. Output overvoltage.

e. Output overload.

f. System alarm.

g. Control logic failure.

h. Overtemperature.

i. Logic power supply failure.

2.1.5 Input/Output Devices

2.1.5.1 Circuit Breaker

Conform to requirements of UL 489 .

2.1.6 Protective Controls

Provide circuitry for the following protective controls.

a. Input undervoltage.

b. Input overvoltage.

c. Loss of phase.

d. Loss of input power.

e. Door interlock - When any access door is opened, the interlock circuitry shall open the 60 Hz input device and not allow the input device to close. For maintenance purposes, provide a bypass switch to defeat the interlock circuitry.

f. Output overload.

g. Rectifier overtemperature protection.

2.1.7 Assembly Construction

Provide enclosures suitable for indoor corrosive environments in accordance with NEMA 250, Type 4X. Arrange to provide required cooling water, entry and exit provisions for equipment within enclosures.

Construct unit(s) so that components, with the exception of control and monitoring components, are totally enclosed within the enclosure.

SECTION 26 35 43 Page 8 AMENDMENT 0005

Electronic circuits including power circuits shall be modular construction readily accessible for maintenance, repair and module replacement from the exterior of the enclosure. For units installed in corrosive environments, electronic circuits shall be enclosed in a sealed electronics compartment that is not provided with direct cooling ventilation or forced air cooling. Provide permanent identification tags for wiring. Uniquely identify each wire. Use the same identification system in the wiring diagrams in the Operation and Maintenance Manual. Provide each enclosure with a finish coat over a substrate which has been provided with a rust inhibiting treatment. Color shall be the manufacturer's standard color.

2.1.8 Enclosure Dimensions

All provided units shall fit in the corresponding locations of the existing rectifiers.

Rectifier ratings associated with RE identifiers are indicated on the associated drawings. All units, installed in the facility, shall include all required NEC and manufacturer clearances in front of and on all sides of units. All units shall fit through access opening (132 inches W x 84 inches D) for installation.

2.1.9 Nameplates

As specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM.

2.2 REMOTE MONITORING AND CONTROL PANEL

Provide remote monitoring and control panel and circuitry. Connect to clearly and permanently labeled terminal blocks located inside the rectifier's enclosure. Provide the circuitry such that indicator lamp/LED information and control function(s) can be extended from the terminals to a remote location in the future.

a. Pushbutton or switch for de-energizing the output terminals.

b. Indicator lamp/LED showing the unit status (energized or not energized).

c. Voltage and current set point display.

d. Recipe input with output functionality options: Ramp, cycle, pulse, etc.

e. Output voltage and current adjust.

f. Start/Stop push button.

g. Alarm Reset- a push button to silence audible alarms.

h. End of Cycle alarm.

2.3 SOURCE QUALITY CONTROL

2.3.1 Rectifier Test Schedule

The Government reserves the right to witness tests. Provide silicon-controlled rectifier test schedule for tests to be performed at the manufacturer's test facility. Submit required test schedule and

SECTION 26 35 43 Page 9 AMENDMENT 0005 location, and notify the Contracting Officer 30 calendar days before scheduled test date. Notify Contracting Officer 15 calendar days in advance of changes to scheduled date.

Test Instrument Calibration.

a. The manufacturer shall have a calibration program which assures that all applicable test instruments are maintained within rated accuracy.

b. The accuracy shall be directly traceable to the National Institute of Standards and Technology.

c. Instrument calibration frequency schedule shall not exceed 12 months for both test floor instruments and leased specialty equipment.

d. Dated calibration labels shall be visible on all test equipment.

e. Calibrating standard shall be of higher accuracy than that of the instrument tested.

f. Keep up-to-date records that indicate dates and test results of instruments calibrated or tested. For instruments calibrated by the manufacturer on a routine basis, in lieu of third party calibration, include the following:

(1) Maintain up-to-date instrument calibration instructions and procedures for each test instrument.

(2) Identify the third party/laboratory calibrated instrument to verify that calibrating standard is met.

2.3.2 Routine Factory Tests

Routine tests shall be performed by the manufacturer on each of the actual silicon-controlled rectifiers prepared for this project to ensure that the design performance is maintained in production. Submit test reports, by serial number and receive approval before delivery of equipment to the project site.

For tests which require full load, use 0.8 power factor unless otherwise noted. All measurements shall be true RMS measurements. Measurements shall be obtained in accordance with IEEE 1159 . Tests shall include the following:

a. Input current and power factor: Operate rectifier at low, nominal and high input voltage at full load. Measure and record input voltage, input power factor and input current in each phase.

b. Output voltage and output current.

c. Efficiency: Operate at nominal input voltage at half load and full load at 1.0 power factor. Measure and record input voltage, input current, input power factor, output voltage, output current, and output power factor. Calculate the unit efficiency.

d. No load losses: Operate at no load and nominal input voltage.

Measure and record input voltage, input current, input power, and input power factor.

SECTION 26 35 43 Page 10 AMENDMENT 0005

e. Burn-in Test: Before delivery, burn-in all units under full load conditions for at least 24 hours by cycling units 6 hours "ON" under full load conditions and 3 hours "OFF" at no load conditions for at least 4 complete "ON" cycles. Burn-in test shall be performed with the rectifier enclosure doors closed and all water cooling systems in the final operating condition.

f. Automatic line drop compensation: Operate rectifier at nominal voltage at:

(1) No-load.

(2) 100 percent of rated capacity with the specified non-linear load.

(a) Loads shall be connected to the rectifier with the specified cable or bus bar assembly. No adjustments to the rectifier shall be allowed between load tests. Monitor and record output voltage at the load end of the cable. Verify specified performance of the line drop compensation.

g. Factory shall perform multiple hour heat tests on the rectifiers.

Verify the unit does not exceed heat capacity when operating at full load.

2.3.3 Special Factory Tests (Design Tests)

Submit special factory test (design test) reports (complete with test data, explanations, formulas, and results), in the same submittal package as the catalog data and drawings for the specified rectifier(s). Tests shall be certified and signed by a registered professional engineer.

Tests shall be on file based on a production model of rectifiers of the same design, construction and rating provided.

As an option, the manufacturer shall test one unit at the same time scheduled for routine tests, of each rating and size rectifier to assure compliance with the specification. For all tests which require full load, use 0.8 power factor unless otherwise noted. The tests shall include the following:

a. Surge protection: Apply input surges in accordance with IEEE C62.41.1 and C62.41.2 and monitor output. Conduct a minimum of three consecutive successful tests on each unit listed. Confirm there is no interruption to output power and voltage stays within specified regulation tolerances. Surge protection tests shall be applicable on all rectifier units utilizing same surge protection device by manufacturer and part number regardless of size.

b. Inrush current: After applying power to the rectifier, conduct a minimum of three inrush current tests at full load. Provide copies of waveform and THD analysis in test report.

c. Input current distortion: Operate at nominal input voltage at full load. Measure and record the input current THD for the current in each phase.

d. Overload/overcurrent: Operate at nominal input voltage with loads listed below:

SECTION 26 35 43 Page 11 AMENDMENT 0005

Percent of Full Load Minimum Operating Time

110 percent 60 min

125 percent 10 min

150 percent 2 min

200 percent 20 sec

Monitor output to confirm there is no power interruption. After minimum operating time is achieved, unit shall interrupt output power.

e. Short-circuit: Apply a bolted line-to-ground, bolted line-to-line, and bolted three phase fault directly to the output terminals of the unit. Conduct a minimum of three consecutive successful tests on each unit. Provide unit capable of carrying the fault current until the integral system protective devices interrupts the fault with no damage to the unit. Provide waveforms of short circuit current during short circuit tests.

f. Electromagnetic interference (EMI) test: EMI test shall meet the requirements of MIL-STD-461 , Part 9, for Class C2 equipment.

Certified test results on units of the same design shall be acceptable.

PART 3 EXECUTION

3.1 INSTALLATION

Install products to operate in the same manner as specified in other sections of this specification, unless indicated or specified otherwise.

Conform to the requirements of NFPA 70 and IEEE C2 and to manufacturer's instructions and recommendations.

3.1.1 Equipment

3.1.1.1 Floor Mounted

Provide proper floor mounting channels and install in accordance with the manufacturer's drawings and instructions and as indicated. Align, level, and bolt or weld units to channels to allow easy withdrawal or insertion of removable components and to permit proper operation and maintenance of equipment.

3.1.2 Grounding

In accordance with NFPA 70 , manufacturer's recommendations, and as specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM.

3.1.3 Wiring and Conduit

3.1.3.1 Building Wiring

Provide Type XHHW or THHN with stranded copper conductors wiring for circuits. Provide wiring for circuits in PVC. Provide wiring and conduit for 60 Hz circuits as specified in Section 26 20 00 INTERIOR DISTRIBUTION

SYSTEM.

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3.1.3.2 Conduit

Use PVC conduit for exposed feeders. For underground or concrete encasement use PVC.

3.1.4 Manufacturer's Representative

The manufacturer's representative shall place the system in operation and make necessary adjustments to ensure optimum operation of the equipment.

The manufacturer's representative shall have at least 2 years of practical experience in the installation and testing of silicon-controlled rectifiers.

3.2 FIELD QUALITY CONTROL

3.2.1 Instruments

Provide test instruments capable of measuring and recording or displaying test data at a higher resolution and greater accuracy than specified for the rectifier's performance. The test instruments used in the field tests shall have current valid calibration stickers issued by an approved calibration laboratory. Verify calibration and adjustments of rectifier instruments provided prior to field tests.

3.2.2 Performance of Acceptance Checks and Tests

Perform field tests and conduct inspections. Provide labor, equipment tests instruments, and incidentals required for the tests including load banks, except the Government will furnish electricity. For all electrical load tests, use 0.8 power factor.

Perform in accordance with the manufacturer's recommendations and include the following visual and mechanical inspections and electrical tests.

3.2.3 Initial Inspection and Tests

a. Compare equipment nameplate information with specifications and approved shop drawings.

b. Inspect physical and mechanical condition.

c. Inspect all bolted electrical connections for high resistance using low-resistance ohmmeter, verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method, or performing thermographic survey.

d. Perform specific inspections and mechanical tests as recommended by manufacturer.

e. Verify correct equipment grounding.

f. Perform resistance measurements through all bolted connections with low-resistance ohmmeter, if applicable.

3.2.4 Performance Tests

Conduct rectifier performance tests under the supervision of the manufacturer's representative. Successfully complete the preliminary

SECTION 26 35 43 Page 13 AMENDMENT 0005 operation, control and protective devices check prior to performing load and transient tests. If the rectifier fails to operate within the specified limits during any of the performance tests the Contractor shall discontinue the test and shall make necessary repairs to correct the failure and restart testing of the rectifier.

3.2.4.1 Preliminary Operation

Inspect the rectifier and make adjustments necessary to assure proper operation in accordance with the manufacturer's instructions. Operate rectifier at 0, 25, 50, 75, and 100 percent of rated full load. Measure and record the output voltage, and current. Calculate output voltage regulation. Verify rectifier is operating within specified limits at each load level. Additionally, coordinate with the Government on rectifier testing associated with the scrubber exhaust testing at the completion of each phase.

3.2.4.2 Control and Protective Device Checks

Operate each control, switch, input/output device that is capable of being operated manually a minimum of three times, demonstrating satisfactory operation each time. Perform operation test on each protective device to ensure that devices functions properly. After each operation measure and record the rectifier output, voltage and current. Verify rectifier is operating within specified limits.

3.2.4.3 Load Test

Operate each unit continuously a minimum of 2 hours at 100 percent rated load. Measure and record the rectifier output, voltage and current.

Verify rectifier is operating within specified limits.

3.2.4.4 Transient Tests

Transient recovery: Operate at the following load steps: 0 to 100 percent, 0 to 50 percent, 100 to 0 percent, and 50 to 0 percent. Provide recordings or displays of voltage and current during each transient test, and indicate on the recordings and displays the time intervals and acceptable limits for voltage and current. Repeat each transient test three times, record the results of each test. Verify rectifier is operating within specified limits.

3.2.5 Grounding System

Inspect ground system for compliance with contract plans and specifications.

3.2.6 Water Quality Requirements

The cooling water shall have the following quality:

a. A neutral or slightly alkaline reaction, i.e., a Ph between 6.0 and 9.0.

b. A chloride content of not more than 20 parts per million; a nitrate content of not more than 10 parts per million; and a sulfate content of not more than 100 parts per million.

c. A total solids content of not more than 250 parts per million.

SECTION 26 35 43 Page 14 AMENDMENT 0005

d. A total hardness, as calcium carbonate, of not more than 250 parts per million.

e. No chemical additives are to be used that increase conductivity above 200 micromhas.

Cooling water temperature should be adjusted properly to avoid condensation on water-cooled metallic surfaces and electrical insulation.

Typical temperature is 29 degrees Celsius. With lower temperature water, humidity control may be necessary to completely stop condensation.

When power thyristors are placed in operation, all surface moisture must be eliminated before voltage is applied. Do not allow thyristors to come in contact with water. Condensation must be wiped off to avoid damage to the thyristor.

When shipping units, all water must be drained from the equipment. If any water remains, it must be an anti-freeze mixture if shipped between September and April. Equipment must be flushed with glycol if the unit is put into storage with temperatures reaching below 33 degrees Fahrenheit.

3.2.7 Follow-up Verification

Upon completion of acceptance checks and tests, the Contractor shall show by demonstration in service that circuits and devices are in good operating condition and properly performing the intended function. As an exception to requirements stated elsewhere in the contract, the Contracting Officer shall be given 5 working days advance notice of the dates and times of checking and testing.

3.3 DEMONSTRATION

3.3.1 Instructing Government Personnel

Provide field training to Government personnel on the operation and maintenance of the rectifier provided. Provide field training 2 weeks prior to the scheduled date for field acceptance tests. As a minimum, the training shall include 2 hours of instruction on the theory of operation and 4 hours on the repair and maintenance of the rectifier. The instructor shall be approved by the manufacturer of the unit provided.

Submit training syllabus including each topic of training and a brief outline of each topic to the Contracting Officer at least 4 weeks prior to training for approval. Training shall be approved by the Contracting Officer at least 2 weeks in advance. The Government may record, video and audio, the training sessions and use these recordings to train personnel on the operation and maintenance of the rectifier system. Provide two copies of video or audio tapes, if used in the training sessions, to the Contracting Officer.

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SECTION 26 35 43 Page 15 AMENDMENT 0005