12_DRAFT SOW.pdf

PURCHASE DESCRIPTION

1. INTRODUCTION

2. BACKGROUND

3. SCOPE

4. APPLICABLE DOCUMENTS

TECHNICAL SUPPORT DOCUMENTS

OPNAV M-5090.1 Environmental Readiness Program Manual

5090.1.pdf

Naval Surface Warfare Center (NSWC), Corona Division, Measurement Science Department, U.S. Navy Metrology Research and Development Program Code MS00 requires research and testing of the feasibility of using aqueous vacuum cavitation methods to clean the interior surfaces of oxygen pressure gauges with closed-end Bourdon tubes.

To help ensure the safety of Navy oxygen systems, Navy policy requires their calibration laboratories to quantitatively verify the cleanliness of all oxygen pressure gauges and flowmeters they calibrate. Current Navy practice employs CFC-113 (1,1,2-trichloro-1,2,2-trifluoroethylene) to clean these test instruments, and cleanliness verification requirements are based on examination of a final solvent rinse from an instrument. Instruments are considered oxygen clean when a final solvent rinse contains no greater than 5 ppm non-volatile residue (NVR) or no greater than 5 ppm hydrocarbons as measured against a mineral oil standard solution.

This project will seek to develop methods to test cyclic vacuum cavitation cleaning on closed-end Bourdon tube pressure gauges, then use these test methods with Navy-supplied Bourdon tube pressure gauges to determine if cyclic vacuum cavitation cleaning can remove known amounts of various contaminant test materials.

Developing compatible cleanliness verification methods and post-cleaning drying techniques are beyond the scope of this project. If this project is successful, the Navy desires to investigate both of these areas in one or more follow-on projects.

file://nawesdnifs101v.nadsuswe.nads.navy.mil/navsea04$/CRNA_MSD/MS00/MS02/GAMEZ%20ARP/FY24%20CONTRACTS/MS00%20VACUUM%20CAVITATION%20CLEANING/5090.1.pdf

MIL-STD-1330E Precision cleaning and testing of shipboard oxygen, helium, helium-oxygen, nitrogen and hydrogen systems

MIL-STD-1330E.pdf

MIL-STD-1622 Standard Practice For Cleaning of shipboard compressed air systems

MIL-STD-1622B.pdf

NASA Document No.

WSTF-IR-95-0048

Investigative Report, Evaluation of Solvent Alternatives to Trichlorotrifluoroethane (CFC-113) for Cleaning of Gauges and Precision Instruments, WSTF-IR-95-0048.pdf file://nawesdnifs101v.nadsuswe.nads.navy.mil/navsea04$/CRNA_MSD/MS00/MS02/GAMEZ%20ARP/FY24%20CONTRACTS/MS00%20VACUUM%20CAVITATION%20CLEANING/MIL-STD-1330E.pdf file://nawesdnifs101v.nadsuswe.nads.navy.mil/navsea04$/CRNA_MSD/MS00/MS02/GAMEZ%20ARP/FY24%20CONTRACTS/MS00%20VACUUM%20CAVITATION%20CLEANING/MIL-STD-1622B.pdf file://nawesdnifs101v.nadsuswe.nads.navy.mil/navsea04$/CRNA_MSD/MS00/MS02/GAMEZ%20ARP/FY24%20CONTRACTS/MS00%20VACUUM%20CAVITATION%20CLEANING/WSTF-IR-95-0048.pdf

5. REQUIREMENTS

Part 1: Design and construct a cyclic aqueous vacuum cavitation system capable of inducing controlled vacuum cavitation inside a closed-end Bourdon tube of a pressure gauge.

1) To facilitate developing this method, a test article other than a Bourdon tube pressure gauge may be used. For example, one or more test articles may be constructed of glass tubing to simulate closed-end Bourdon tubes and used to enable visual confirmation of vacuum cavitation on interior tube surfaces.

Part 2: Use the vacuum cavitation system developed in Part 1 to test the effectiveness of the method to clean interior surfaces of Bourdon tubes in Navy-supplied pressure gauges.

1) Test Items. The Navy will select a set of oxygen pressure gauges to represent gauges calibrated in Navy labs and make these available for testing.

2) Method. Cleaning efficacy will be determined by the ability of the cleaning method to remove known amounts of various test contaminants (see Table 1 below).

3) Reporting. Cleaning effectiveness will be reported quantitatively. Any suitable quantitative measurement is acceptable, such as by comparing the measured dosing amount of contaminant(s) with the measured amount of contaminant(s) remaining in a gauge after cleaning or by comparing the measured dosing amount of contaminant(s) with the measured (total) amount of contaminant(s) removed by a cleaning test.

Other methods may be acceptable if mutually agreed upon by the offeror and Navy representatives.

a. The amount of contaminant material remaining in a cleaned gauge may be measured by rinsing the gauge with clean purified CFC-113 and analyzing the rinse solution with infrared spectroscopy to measure hydrocarbon absorbance using standard solutions of mineral oil in CFC-113.

b. Alternatively, the amount of contaminant material remaining in a cleaned gauge may be measured by rinsing the gauge with a suitable solvent and analyzing the rinse solution by measuring the amount of non-volatile residue in the solvent rinse.

4) Dosing. When quantitatively measuring cleaning effectiveness, use methods similar to those outlined in Reference (d) to deposit a known amount of contaminant inside the pressure gauge used for each test. These methods are summarized as follows:

a. Prepare a standard contaminant test solution by combining one gram of each of the first five compounds in Table 1 below with 100 mL CFC-113. The uniformity of this 5-component nonhomogeneous mixture shall be maintained throughout testing using suitable means (such as constant agitation).

b. Prior to quantitative testing, clean each test article or gauge with solvent and verify cleanliness by using one of the methods above (Part 2, 3a or 3b).

Starting cleanliness criterion using IR spectroscopy is less than 2 ppm hydrocarbons using a standard mineral oil solution. Starting cleanliness criterion using NVR is less than 2 ppm.

c. Determine the dry weight of each test article or gauge prior to dosing with test contaminant solution.

d. NASA WSTF dosed test articles and gauges with 200, 400, or 600 μL of the standard 5-component mix corresponding to 10, 20, or 30 mg of total test contaminant material. A similar procedure is suitable for this project.

e. After dosing, test articles should be dried then reweighed to verify the amount of dosed material.

5) Analysis. After vacuum cavitation cleaning, cleaning performance shall be measured using one of the methods listed in Part 2, 3a or 3b above. As stated in Part 2, paragraph 3, other quantitative methods may be acceptable if previously agreed upon by the offeror and Navy representatives. For all methods, it is desirable to compare the final dry weight of each test article or gauge to the article’s initial weight if this is feasible using the offeror’s existing laboratory analytical balance. The Navy recognizes that the weight of some of the test gauges may exceed the capacity of the offeror’s instruments, thus rendering this unfeasible.

a. If using one of the solvent analysis methods in 3a or 3b, a cleaning system such as a King Nutronics model 3646-4-104 may be used to solvent-clean test articles or gauges. If multiple solvent rinses are used, the total amount of contaminant removed by the solvent shall be determined by suitable quantitative means. For example, the referenced NASA WSTF test procedure requires five consecutive test solvent rinses which are then combined for NVR determination to evaluate the cleaning performance of the candidate solvents. Each article was then flushed with CFC-113, which was collected and analyzed by measuring the NVR. A similar approach is appropriate for this project.

5. REQUIREMENTS CON’T

6. GOVERNMENT FURNISHED PROPERTY

6.1 Government Furnished Material

6.2 Government Furnished Equipment

6.3 Government Furnished Information

Table 1. Test Contaminants

Contaminant Description Commercial Product(s)

KrytoxTM 240AC Aerospace Grade perfluoroalkylpolyether (PFPE) Grease with polytetrafluoroethylene (PTFE) Thickener

KrytoxTM 240AC is a product of The Chemours Company

MIL-PRF-5606H Hydraulic Fluid, Petroleum (Mineral Oil) Base

Royco 756, Aeroshell 41 Hydraulic Fluid, Phillips 66 X/C 5606J Aviation Hydraulic Fluid

MIL-PRF-

83282D

Fire Resistant Hydraulic Fluid, Synthetic Hydrocarbon Base

Royco 782, Castrol Brayco Micronic 882 Fire Resistant Hydraulic Fluid, Aeroshell Fluid 31

Sebacate gauge calibration fluid HallStar MONOPLEX DOS (Di-2-ethylhexyl Sebacate;

Dioctyl Sebacate)

Spinesstic 22 Petroleum Lubricating Oil, common gauge calibration oil

Discontinued, but replaced by: Mobil Velocite 10

TBD (will provide once item is received at NSWC Corona)

Oxygen Gauges, King Nutronics vacuum cleaning device, CFC-113, any contaminants that SHSU has difficulty purchasing

TBD (will provide once item is received at NSWC Corona)

7. DELIVERABLES

CDRL DESCRIPTION DID

A001 Scientific and Technical Reports DI-MISC-80711A

A002 Scientific and Technical Reports DI-MISC-80711A

8. ACRONYM LIST

ACRONYM DENOTATION

FT-IR Fourier-transform infrared

KN King Nutronics KNC King Nutronics Corporation

NSWC Naval Surface Warfare Center