Attachment 1 - CSS 06-3228.pdf

CALIBRATION STANDARD SPECIFICATION

PROCUREMENT PACKAGE

BENCHTOP

WIND TUNNEL

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

CSS 06-3228

DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited

JULY 2025

CALIBRATION STANDARD SPECIFICATION

PROCUREMENT PACKAGE

BENCHTOP

WIND TUNNEL

Physical/Mechanical Standards (MS 33)

Measurement Science Department

Naval Surface Warfare Center, Corona Division

P.O. Box 5000

Corona, CA 91718-5000

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

BENCHTOP WIND TUNNEL CALIBRATION STANDARD SPECIFICATION CSS 06-3238

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Table of Contents

1.0 SCOPE

1.1 General

1.2 Usage

1.3 Classification

1.3.1 Class

1.3.1.1 Configuration

2.0 APPLICABLE DOCUMENTS

2.1 Reference documents

2.2 Order of precedence

3.0 REQUIREMENTS

3.1 Equipment components

3.1.1 Equipment Configuration

3.1.1.1 Benchtop Wind Tunnel

3.1.1.2 Intake and Exhaust Manifolds

3.1.1.3 Variable Speed Motor

3.1.1.4 Motor Controller

3.1.1.5 Unit Under Test Mounting

3.1.2 Finish

3.1.3 Interchangeability

3.2 Design and construction

3.2.1 Operator

3.2.2 Connectors, electric

3.2.3 Air speed measurement capability

3.2.4 Warranty

3.3 Electrical power sources and connections

3.3.1 Electrical power source

3.3.2 Electrical power connections

3.3.2.1 Input power cable

3.3.2.2 Power switches

3.3.2.3 Motor Controller

3.4 Physical characteristics

3.4.1 Dimensions

3.4.2 Weight

3.5 Marking and identification

3.5.1 Marking

BENCHTOP WIND TUNNEL CALIBRATION STANDARD SPECIFICATION CSS 06-3238

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3.5.2 Control markings and processes

3.6 Environmental requirements

3.6.1 Warm-up

3.6.2 Temperature and humidity

3.6.2.1 Temperature operating

3.6.2.2 Humidity operating

3.7 Performance requirements

3.7.1 Air Speed Range

3.7.2 Acoustic Noise Levels

3.8 Maintainability

3.8.1 Fault isolation

3.8.2 Repair

3.9 Technical manuals

3.9.1 Content, technical manuals

3.9.1.1 Use and installation, technical manual section

3.9.1.2 Maintenance and servicing, technical manual section

3.9.1.3 Cleaning maintenance

3.9.1.4 Part replacement information

3.10 Workmanship

3.11 Shipping

4.0 VERIFICATION

4.1 General

4.2 Technical Manual Review

4.3 Preoperational inspection

4.4 Failure criteria

4.5 Test conditions

4.6 Accuracy of test instruments

PISTON PROVER PRIMARY LIQUID FLOW CALIBRATOR CALIBRATION STANDARD SPECIFICATION CSS 06-3238

1.0 SCOPE

1.1 General. This document specifies the minimum requirements for a Benchtop type Wind Tunnel. This equipment may be of a commercial design or modified commercial design to fit the Navy procurement and test requirement needs. The Benchtop Wind Tunnel is intended to be used by civilian Navy personnel in shore-based ship yard laboratories for calibration support of a wide variety of hot wire type anemometer air velocity measurement devices.

1.2 Usage. Equipment covered by this Calibration Standard Specification (CSS) is intended for use in the calibration of air velocity meters in controlled environments. Air velocity meters requiring calibration are typically hot wire type anemometers with probe diameters ranging from 1/8 to 3/8 inch with calibrated ranges from 25 to 9000 feet per minute (fpm). The requirements of this CSS are tailored to the intended use of the equipment. Specific requirements of MIL- PRF-28800F, as identified in this CSS, are invoked according to the class of equipment.

1.3 Classification.

1.3.1 Class. The Benchtop Wind Tunnel shall be classified as Class 3 equipment and shall conform to Class 3 requirements in accordance with MIL-PRF-28800, and as specified in this CSS. Class 3 equipment is designed for operational environments where conditions are routinely encountered in a diverse, controlled climate.

1.3.1.1 Configuration. The Benchtop Wind Tunnel shall fit on a standard 6 foot x 3 foot calibration workbench. The Benchtop Wind Tunnel shall at a minimum cover the range of 25 to 9000 fpm. The minimum test chamber cross sectional area shall be 4”x4” with a minimum length of 6”.

2.0 APPLICABLE DOCUMENTS

2.1 Reference documents. The following document forms a part of this specification to the extent specified herein. Unless otherwise indicated, the issue of this document shall be the one in effect on the date of this solicitation.

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-28800G - Test Equipment for use with Electrical and

(Copies of DoD specifications are available online at http://assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

2.2 Order of precedence. In the event of conflict between the text of this CSS and the references cited herein, the text of this specification shall take precedence.

Nothing in this CSS, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.0 REQUIREMENTS

3.1 Equipment components. Parts, materials, and process shall be as specified in

3.1.1 Equipment Configuration through 3.1.3 Interchangeability.

3.1.1 Equipment Configuration. The Benchtop Wind Tunnel shall consist of: Wind Tunnel test chamber area, Intake and Exhaust manifolds, Variable Speed Motor, and Motor Controller. If the wind tunnel requires the use of restrictive plates to control the air speed in the test chamber area these plates shall also be included with the system.

3.1.1.1 Benchtop Wind Tunnel. The Benchtop Wind Tunnel shall be capable of generating uniform and stable air velocities over the range of 25 to 9000 fpm in the test chamber area to facilitate calibration and testing of hot wire anemometers.

3.1.1.2 Intake and Exhaust Manifolds. The Intake Manifold allows air to enter the wind tunnel and shall contain honeycomb or similar type flow straighteners/baffles to smooth the air velocity flow pattern into the test chamber area. The Exhaust Manifold shall contain the wind tunnel motor and allows air to exit the test chamber area.

3.1.1.3 Variable Speed Motor. Minimum 0 to 10000 RPM or equivalent, 120 VAC single-phase 60 Hz source. Maximum current 15 amps.

3.1.1.4 Motor Controller. A precision motor control that allows adjustment of the air speed in the wind tunnel test area shall be included in the system. The motor controller shall operate using a 120 VAC single-phase 60 Hz source, and shall use a minimum 10 turn potentiometer.

3.1.1.5 Unit Under Test Mounting. The Benchtop Wind Tunnel shall include a port that allows the probe of the unit under test anemometer to be securely mounted in the Wind Tunnel test chamber area. The use of compression type fittings and ferrules is acceptable as long as the fittings accommodate probes with 1/8” 3/16”, 1/4”, and 3/8” diameter size probes.

3.1.2 Finish. Unless otherwise specified the equipment shall be the finish normally provided by the manufacturer.

3.1.3 Interchangeability. A model number shall be designated for all units provided.

All units with the same model number and the replaceable assemblies, subassemblies, and parts comprising the unit shall be interchangeable on a noninterference basis.

3.2 Design and construction. The Benchtop Wind Tunnel shall be designed and constructed to permit compliance with all applicable requirements, as defined in this CSS as well as the operation, performance, and other requirements in this

CSS.

3.2.1 Operator controls. Operating controls and indicators shall be readily accessible to the operator from the front of the equipment when the system is fully setup and installed for use.

3.2.2 Connectors, electric. Provision shall be made to ensure that connectors will be mated only with the appropriate counterparts. All connectors shall be clearly labeled. Where design considerations require close proximity of connectors of similar configuration, the mating connectors shall be suitably coded or marked to minimize risk.

3.2.3 Air speed measurement capability. The Benchtop Wind Tunnel procured under this specification does not require the ability of the wind tunnel to measure the air speed. The Navy will be using an externally procured air speed transducer placed in the test chamber area with the air velocity meter being tested for measurement purposes.

3.2.4 Warranty. The Benchtop Wind Tunnel shall have a minimum of a one year warranty after initial delivery.

3.3 Electrical power sources and connections. The electrical power sources and connections shall be as specified below in 3.3.1 Electrical power source and

3.3.2 Electrical power connections.

3.3.1 Electrical power source. The Benchtop Wind Tunnel shall operate at 120 VAC single-phase 60 Hz source. Maximum current 15 amps.

3.3.2 Electrical power connections. Power connectors and connections for equipment rated above 10 amps shall be as specified below. When single-phase operation is specified, the equipment shall operate with a ground at the primary power source on either or neither side of the single phase input power line.

3.3.2.1 Input power cable. Unless specified, the input power cable shall use a NEMA 5-15P three prong with ground type connector plug.

3.3.2.2 Power switches. The operator shall be able to energize the equipment from the front panel when the equipment is fully setup.

3.3.2.3 Motor Controller. The Benchtop Wind Tunnel Motor Controller shall be provided with a fuse or circuit breaker type design to protect it in the event of excessive current. The motor controller shall be enclosed in a NEMA 4 or equivalent type housing.

3.4 Physical characteristics. The physical characteristics of the Benchtop Wind Tunnel shall be as specified in 3.4.1 Dimensions through 3.4.2 Weight.

3.4.1 Dimensions. Maximum dimensions of the Benchtop Wind Tunnel including handles and covers, if any, shall not exceed 72 inches in length, 24 inches in width and 24 inches in height.

3.4.2 Weight. The weight Benchtop Wind Tunnel shall not exceed 70 pounds. The weight of the wind tunnel motor controller shall not exceed 3 pounds.

3.5 Marking and identification. Marking and identification of the Benchtop Wind Tunnel shall be as specified below in 3.5.1 Marking and 3.5.2 Control markings and processes.

3.5.1 Marking. The Benchtop Wind Tunnel shall be marked in a manner that does not adversely affect safety or performance. At a minimum the manufacturer, model number, and serial number of the unit shall be identified.

3.5.2 Control markings and processes. Control markings shall enable the operator to identify the functions and use of all items requiring operator intervention.

3.6 Environmental requirements. The Benchtop Wind Tunnel environmental performance requirements shall be as specified below in 3.6.1 Warm-up and

3.6.2 Temperature and humidity. It shall conform to the specified performance when subjected to the environmental conditions of this specification.

3.6.1 Warm-up. The Benchtop Wind Tunnel shall comply with the specified performance requirements after a 5-minute warm-up period.

3.6.2 Temperature and humidity. The temperature ranges and humidity limits for operating conditions shall be as specified below in 3.6.2.1 Temperature operating and 3.6.2.2 Humidity operating.

3.6.2.1 Temperature operating. The Benchtop Wind Tunnel shall conform to the specified performance and accuracy while being operated at temperatures over the range of 60 °F to 85 °F (15.56 °C to 29.44°C).

3.6.2.2 Humidity operating. The Benchtop Wind Tunnel shall conform to the specified performance and accuracy while being operated a humidity range of 20% RH to 60% RH.

3.7 Performance requirements.

3.7.1 Air Speed Range. The Benchtop Wind Tunnel shall be capable of generating and controlling uniform and stable air speed velocities in the range of 25 to 9000 fpm that allow calibration and testing of hot wire anemometers. The use of flow restriction plates to generate low flows is considered acceptable.

3.7.2 Acoustic Noise Levels. The noise level generated by the Benchtop Wind Tunnel at high air speeds shall not exceed 84 dB(A).

3.8 Maintainability. Maintainability shall be as specified below in 3.8.1 Fault isolation and 3.8.2 Repair.

3.8.1 Fault isolation. The design of the equipment shall permit isolation of faults, and repair down to the component item or lowest replaceable unit with the maintenance provisions furnished.

3.8.2 Repair. Maintenance instructions shall be furnished to facilitate the replacement of components and testing procedures to ensure the performance of the component or the repair action taken. Spare parts information shall be provided for all major components of the system.

3.9 Technical manuals. One copy of an operation/user manual shall be provided with each unit. The technical manual shall be provided in both printed and electronic format.

3.9.1 Content, technical manuals. The contents of the operation/user manual shall include sections addressing: general information, description (model number, dimensions, and weight), power information, operational environment requirements, specifications/performance characteristics, use and installation, operating instructions, and maintenance and service.

3.9.1.1 Use and installation, technical manual section. This section shall contain information on the following: initial adjustments and control settings, startup procedures, required clearances, illustrations of equipment connections, and installation precautions.

3.9.1.2 Maintenance and servicing, technical manual section. The level of maintenance philosophy shall be component level. Maintenance instructions shall be furnished to facilitate the replacement of components on the systems. Testing procedures to ensure the performance of the component or the repair action taken shall be provided.

3.9.1.3 Cleaning maintenance. Cleaning information covering intervals, types of solvents, and materials used shall be listed in the maintenance and servicing section of the technical manual.

3.9.1.4 Part replacement information. Common commercial parts shall be identified by part number and description to facilitate substitutions of parts from other sources.

3.10 Workmanship. The manufacture and assembly of the items covered by this CSS shall be representative of the best commercial practices and shall conform to the requirements of this CSS. All items will remain securely held in place during normal transit. Adequate protection will be afforded for the equipment on all sides to avoid transient damage.

3.11 Shipping. The manufacturer will be responsible for shipping of the Benchtop Wind Tunnel to the receiving site. Any damage to the shipping container will be reported to the manufacturer when received by the Navy. The Navy shall locate the delivered Benchtop Wind Tunnel in the test area where it will be used and will be responsible for installation and setup.

4.0 VERIFICATION

4.1 General. All Benchtop Wind Tunnel procured shall be capable of satisfying all of the requirements indicated in Section 3 of this CSS and shall be subjected to testing. Verification shall be accomplished by using the test procedures in MIL- PRF-28800 for Class 3 equipment for those tests identified and as modified in the following paragraphs.

4.2 Technical Manual Review. The Benchtop Wind Tunnel Technical Manual(s) shall be reviewed and examined for compliance with the requirements specified in paragraph 3.9 Technical manuals of this CSS.

4.3 Preoperational inspection. The preoperational inspections shall consist of mechanical and visual examination and test to determine that all materials, workmanship, and operational characteristics comply with the specified requirements. The equipment shall be examined or tested to confirm that all electrical wiring is correct and that no mechanical problems are evident.

4.4 Failure criteria. For the purposes of this specification, equipment failure is defined as any departure from the specified requirements or deviation from the criteria specified in 3.0 Requirements after the test is initiated. The item shall have failed the test when any of the conditions specified in a. through g. below occur:

a. Monitored functional parameters deviate beyond acceptable limits.

b. Catastrophic or structural failure.

c. Mechanical binding or loose parts, including screws, clamps, bolts, and nuts, that results in component failure or a hazard to personnel safety.

d. Malfunction.

e. Degradation of performance beyond limits established in the purchase description.

f. Any additional deviations from acceptable criteria established before the test.

g. Deterioration, corrosion, or change in any internal or external parts that could in any manner prevent the test item from conforming to operational service or maintenance requirements.

4.5 Test conditions. Unless otherwise specified the inspections specified herein shall be performed under the conditions of a. through d below. Ambient conditions within the specified ranges need not be controlled. For equipment having a specified warm-up or stabilization period after turn-on, formal measurements and observations shall be made only after the specified time period as specified previously in 3.6.1 Warm-up.

a. Temperature: 60 °F to 85 °F

b. Humidity: 20% RH to 60% RH

c. Power: Nominal power source specified for the equipment

d. Attitude: Normal operating position

4.6 Accuracy of test instruments. The test instruments used to monitor the test parameters shall be verified to be within their calibration cycle prior to performing tests.