MIL-STD-1330E.pdf

AMSC N/A FSC 4730

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

INCH-POUND

MIL-STD-1330E(SH)

16 May 2022

SUPERSEDING

MIL-STD-1330D(SH)

w/CHANGE 1

28 June 2007

DEPARTMENT OF DEFENSE

STANDARD PRACTICE

PRECISION CLEANING AND TESTING OF

SHIPBOARD OXYGEN, HELIUM, HELIUM-OXYGEN,

NITROGEN, AND HYDROGEN SYSTEMS

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ii

FOREWORD

1. This standard is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense.

2. This standard is for use by naval activities and private firms performing services as prime or sub-contractors for Naval Sea Systems Command.

3. Comments, suggestions, or questions on this document should be addressed to Commander, Naval Sea

Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard, D.C.

20376-5160 or emailed to CommandStandards@navy.mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the currency of this address information using the ASSIST

Online database at https://assist.dla.mil.

mailto:commandstandards@navsea.navy.mil https://assist.dla.mil/ iii

CONTENTS

PARAGRAPH PAGE

1. SCOPE

1.1 Scope

1.2 Applicability

1.2.1 Oxygen or oxygen-enriched systems and components, including gaseous and liquid oxygen generating equipment

1.2.1.1 Low-pressure electrolyzers

1.2.2 Hydrogen and nitrogen systems and components that support gaseous or liquid oxygen generating equipment

1.2.2.1 Hydrogen systems

1.2.2.2 Nitrogen systems

1.2.3 Helium, helium-oxygen, and hydrogen systems and components that provide life support

1.2.4 Other equipment

1.2.5 Diver life support equipment

1.2.6 Submarine demineralized water systems

2. APPLICABLE DOCUMENTS

2.1 General

2.2 Government documents

2.2.1 Specifications, standards, and handbooks

2.3 Non-Government publications

2.4 Order of precedence

3. DEFINITIONS

3.1 Aqueous cleaning solution

3.2 Blue line

3.3 Clean

3.4 Cleaning solvent

3.5 Cleanliness level

3.5.1 General

3.5.2. Basic

3.6 Clean lint-free cloth

3.7 Cleanroom

3.8 Components

3.9 Contractor

3.10 Controlled area

3.11 Dew point

3.12 Final cleaner

3.13 Halogenated solvent

3.14 Helium

3.15 Maximum operating pressure

3.16 Membrane filter

3.17 Nitrogen

3.18 Objective quality evidence

3.19 Organic

3.20 Oxygen clean

3.21 Oxygen-enriched

3.22 Precision cleaning

3.23 Pre-cleaner

3.24 Sample

3.25 Surfactant

3.26 Validation

3.27 Vendor

3.28 Water

3.29 Wetted surface

4. GENERAL REQUIREMENTS

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PARAGRAPH PAGE

4.1 Oxygen safety precautions

4.2 Water

4.2.1 Applicability

4.2.2 Disposal

4.2.3 Compatibility

4.3 Aqueous cleaning solutions

4.3.1 Navy oxygen cleaner (NOC)

4.3.1.1 Applicability

4.3.1.2 Safety precautions

4.3.1.3 Disposal

4.3.1.4 Compatibility

4.3.1.5 Inspection prior to use

4.3.1.6 Dilution

4.3.1.7 Use of NOC in previously used equipment

4.3.1.8 Use for extended periods

4.3.1.9 Filtration

4.3.1.10 Stowage

4.3.2 Tribasic sodium phosphate (TSP)

4.3.2.1 Applicability

4.3.2.2 Safety precautions

4.3.2.3 Disposal

4.3.2.4 Compatibility

4.3.2.5 Solution preparation

4.3.2.6 Stowage

4.3.3 Non-ionic detergent (NID)

4.3.3.1 Applicability

4.3.3.2 Safety precautions

4.3.3.3 Disposal

4.3.3.4 Compatibility

4.3.3.5 Solution preparation

4.4 Cleaning solvents

4.4.1 NAVSEA-approved halogenated solvents other than Solstice

4.4.1.1 Applicability

4.4.1.2 Safety precautions

4.4.1.3 Disposal

4.4.1.4 Compatibility

4.4.1.5 Use of NAVSEA-approved halogenated solvents

4.4.1.6 Water previously used in systems

4.4.2 Solstice performance fluid

4.4.2.1 Applicability

4.4.2.2 Safety precautions

4.4.2.3 Disposal

4.4.2.4 Compatibility

4.4.3 Isopropyl alcohol (IPA)

4.4.3.1 Applicability

4.4.3.2 Safety precautions

4.4.3.3 Disposal

4.4.3.4 Compatibility

4.5 Other cleaners

4.5.1 Other pre-cleaners

4.5.2 Other final cleaners

4.6 Incompressible test fluids

4.6.1 Safety precautions

4.6.2 Water

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PARAGRAPH PAGE

4.6.3 Cleaning solvent

4.7 Compressible test fluids

4.7.1 Safety precautions

4.7.2 Helium

4.7.3 Nitrogen

4.7.4 Oxygen

4.7.5 Argon

4.8 Cleaning silver-brazed piping

4.9 Lubricants

5. DETAILED REQUIREMENTS

5.1 Facility requirements

5.1.1 Structure

5.1.1.1 Class A

5.1.1.2 Class B

5.1.1.3 Class C

5.1.2 Maintenance

5.1.2.1 Class A

5.1.2.2 Class B

5.1.2.3 Class C

5.1.3 Temperature and humidity

5.1.4 Air filtration

5.1.4.1 Type A

5.1.4.2 Type B

5.1.5 Ventilation and air pressure

5.1.5.1 Class A

5.1.5.2 Class B

5.1.5.3 Class C

5.1.6 Personnel clothing

5.1.6.1 Class A

5.1.6.2 Class B

5.1.6.3 Class C

5.1.7 Tools and equipment

5.2 Aqueous component cleaning process for general applications

5.2.1 Applicability

5.2.2 Objective

5.2.3 Material and equipment

5.2.4 Pre-clean and rinse

5.2.5 Final clean, verification, and rinse

5.2.6 Dry, reassemble, and package

5.3 Flask cleaning and inspection

5.3.1 Applicability

5.3.2 Material and equipment

5.3.3 Clean, verification, and rinse

5.3.4 Drying

5.3.5 In-service interior inspection

5.3.5.1 Oil and grease

5.3.5.2 Particulate

5.3.5.3 Corrosion

5.3.5.4 Internal paint

5.4 Cleaning and calibration of instruments and gauges

5.5 Aqueous system cleaning process for general applications

5.5.1 Applicability

5.5.2 Material and equipment

5.5.3 System preparation

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PARAGRAPH PAGE

5.5.3.1 System sectioning

5.5.3.2 Prerequisites

5.5.3.3 Cleaning of removed components

5.5.3.4 In-line volumes

5.5.4 Electrolytic oxygen gas generators

5.5.5 Leak-check

5.5.6 Preflush

5.5.7 Hydrostatic test

5.5.8 Final flush or pipe line cleaning

5.5.9 Rinsing and particulate flushing

5.5.10 Drying and reinstalling components

5.6 Potassium hydroxide (KOH) inspection

5.6.1 Applicability

5.6.2 Inspection

5.6.3 KOH removal

5.7 Component cleaning with solvent

5.7.1 Applicability

5.7.2 Objective

5.7.3 Material and equipment

5.7.4 Pre-clean and rinse

5.7.5 Final clean and verification

5.7.6 Dry, reassemble, and package

5.8 Piping, hose, and system cleaning with solvent

5.8.1 Applicability

5.8.2 Oxygen-nitrogen plants

5.8.2.1 Material and equipment

5.8.2.2 Cleaning solvent

5.8.2.3 Cleaning method

5.8.2.4 Sample and removal of cleaning solvent from system

5.8.3 Piping, hose, and system flushing

5.8.3.1 Material and equipment

5.8.3.2 Preliminary joint tightness test

5.8.3.3 Hydrostatic test

5.8.3.4 Flush

5.8.3.5 Maintenance of pressure in system

5.9 Testing

5.9.1 Pressure testing

5.9.2 Operational testing

5.9.3 Gas sampling and analysis

5.10 Removal and replacement of components in oxygen clean systems

5.10.1 General requirements

5.10.1.1 External preparation

5.10.1.2 Internal isolation

5.10.1.3 Contamination control

5.10.1.4 Pre-purging

5.10.1.5 Maintaining cleanliness

5.10.1.6 Welding and brazing

5.10.1.7 Containment and purge

5.10.1.8 Unscheduled delays

5.10.2 Purge

5.11 Piping repairs

5.11.1 Applicability

5.11.2 System preparation

5.11.3 Maintenance of purge

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PARAGRAPH PAGE

5.11.4 Cutting or grinding of system

5.11.5 Cleaning

5.11.6 Inspection and testing

5.12 Loss of system cleanliness

5.12.1 Definition

5.12.2 Method for determination of extent of contamination

5.12.3 Corrective action

5.12.4 Local cleaning

5.13 Process verification methods

5.13.1 Visual surface inspection methods

5.13.1.1 Applicability

5.13.1.2 Ultraviolet light method

5.13.1.3 Bright white light method

5.13.1.4 Swipe method

5.13.2 Hydrocarbon and NVR analysis methods

5.13.2.1 Applicability

5.13.2.2 Shake test

5.13.2.3 Non-volatile residue in NOC

5.13.2.4 Solvent extraction of aqueous cleaners

5.13.2.5 Solvent NVR

5.13.2.6 Solvent optically stimulated electron emission

5.13.2.7 Solvent infrared spectrophotometry

5.13.2.8 White light visual clarity inspection

5.13.3 Particulate inspection methods

5.13.3.1 Applicability

5.13.3.2 White light visual particle inspection

5.13.3.3 Particle count

5.13.4 pH analysis

5.13.4.1 Applicability

5.13.4.2 Rinse water pH

5.13.4.3 NOC pH

5.13.5 NOC alkalinity

5.13.5.1 Equipment

5.13.5.2 Reagents

5.13.5.3 Reagent preparation

5.13.5.4 Procedure

5.13.5.5 Calculation

5.13.6 Detection of hydrocarbon contamination by swipe

5.13.6.1 Equipment

5.13.6.2 Swipe procedure

5.13.6.3 FTIR procedure

5.14 Personnel qualification and training

5.14.1 Applicability

5.14.2 Course of instruction

5.14.2.1 Certified oxygen clean instructor

5.14.2.2 Certified oxygen clean worker

5.14.3 Requalification

5.15 Validation of the component cleaning process

5.15.1 Periodicity

5.15.2 Procedure

5.16 Packaging, identification, and storage

5.16.1 Packaging

5.16.1.1 Applicability

5.16.1.2 Internally and externally cleaned components

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PARAGRAPH PAGE

5.16.1.3 Internally cleaned items

5.16.2 Identification

5.16.2.1 Acceptance

5.16.2.2 Rejection

5.16.3 Storage

5.16.3.1 Location

5.16.3.2 Inspection of packaging

5.17 In-process inspections

5.17.1 Inspection

5.17.2 Objective quality evidence (OQE)

5.17.3 Audit or surveillance

5.17.4 Accountability of small items

6. NOTES

6.1 Intended use

6.2 Acquisition requirements

6.3 NAVSEA approval and direction

6.3.1 Deviations

6.3.2 References

6.4 Safety precautions

6.5 Subject term (key word) listing

6.6 Changes from previous issue

APPENDIX A. MATERIAL COMPATIBILITY

APPENDIX B. GRAVIMETRIC ANALYSIS OF NON-VOLATILE RESIDUE IN NAVY OXYGEN

CLEANER

APPENDIX C. TEST PROCEDURE FOR SOLVENT EXTRACTION OF AN AQUEOUS INORGANIC

CLEANER

APPENDIX D. ANALYSIS OF RESIDUE IN SOLVENT BY OPTICALLY STIMULATED ELECTRON

EMISSION USING A SURFACE QUALITY MONITOR

APPENDIX E. NAVSEA-APPROVED HALOGENATED SOLVENTS

APPENDIX F. ANALYSIS OF NON-VOLATILE RESIDUE IN SOLVENT BY EVAPORATIVE

GRAVIMETRIC

APPENDIX G. BASIC CLEANING PROCEDURES

LIST OF FIGURES

FIGURE PAGE

FIGURE 1. Typical certification sticker FIGURE 2. Typical certification tag FIGURE B-1. Filtration for determining NVR in NOC by gravimetric FIGURE D-1. Cross-sectional view of evaporating dish FIGURE D-2. 5 PPM acceptance criteria for sample

LIST OF TABLES

TABLE PAGE

TABLE I. Grades of water TABLE II. Cleanroom and controlled area requirements TABLE III. Applicability matrix for flush duration and back flush TABLE IV. Solvent cleaning processes TABLE V. Hydrostatic testing TABLE VI. Joint tightness testing ix

TABLE PAGE

TABLE VII. Seat tightness testing TABLE VIII. Pressure drop testing TABLE IX. Containment and purge requirements TABLE X. Hydrocarbon and NVR analysis methods TABLE XI. Film for packaging TABLE XII. In-process operation inspections TABLE A-I. Metallic material compatibility TABLE A-II. Rubber material compatibility TABLE A-III. Plastic material compatibility TABLE A-IV. Rubber compatibility criteria TABLE A-V. Plastic compatibility criteria TABLE D-I. Preparation and analysis of 5 ppm equivalent laboratory standards TABLE D-II. Dish acceptance criteria applicability matrix TABLE D-III. Acceptable range for 5 ppm acceptance criteria without baseline TABLE D-IV. Acceptable range for 5 ppm acceptance criteria with baseline TABLE E-I. NAVSEA-approved halogenated solvents TABLE G-I. Applicability matrix for flush duration and back flush

1. SCOPE

1.1 Scope. This standard provides the requirements for precision cleaning and testing of oxygen and oxygen-enriched systems and components. Gas systems that interface with oxygen are also included in this standard.

Oxygen generating plants, their systems, and components fall within the scope of this document. Each activity will implement the applicable requirements of this document through a locally prepared and approved procedure.

Activities subject to additional quality assurance requirements such as those required in

SS800-AG-MAN-010/P-9290 or SS521-AA-MAN-010 will obtain procedure approval from the applicable certifying activity.

1.2 Applicability. This standard is applicable to all surface ships, submarines, manned and unmanned submersibles, and supporting shore-based facilities that contain any of the following.

1.2.1 Oxygen or oxygen-enriched systems and components, including gaseous and liquid oxygen generating equipment. The cleanliness boundary includes all material wetted by any fluid containing greater than 25 percent by volume oxygen during normal operations. Cleaning in accordance with 3.5.1 is the baseline requirement unless a higher or lower level of cleaning is specified.

1.2.1.1 Low-pressure electrolyzers. Low-pressure gaseous oxygen-generating plants with configurations where the oxygen or oxygen-enriched wetted components and piping are open-ended and are not capable of building oxygen pressure of 50 psig or greater are cleaned in accordance with 3.5.2.

1.2.2 Hydrogen and nitrogen systems and components that support gaseous or liquid oxygen generating equipment. Hydrogen and nitrogen systems are cleaned to the same level as the oxygen system they support.

1.2.2.1 Hydrogen systems. The cleanliness boundary for hydrogen systems supporting oxygen generating equipment encompasses all wetted material from, and including, the point of interface or interface connection with an oxygen or oxygen-enriched system or component to the first check valve or normally shut isolation valve.

Remaining portions of hydrogen systems should be cleaned using best commercial practice to remove loose scale, dust, grit, filings, oil, and grease.

1.2.2.2 Nitrogen systems. The cleanliness boundary for submarine nitrogen systems supporting oxygen-generating equipment encompasses all wetted material from, and including, the point of interface or interface connection with an oxygen or oxygen-enriched system or component upstream to either:

a. The nitrogen supply flasks, including all piping and components associated with charging when such supply is connected to oxygen generating equipment. Nitrogen piping to the ship demineralized water storage tank is cleaned in accordance with 3.5.2.

b. The last check valve or normally shut isolation valve that separates the remainder of the nitrogen system from the oxygen generator nitrogen supply. Remaining portions of the nitrogen system are cleaned in accordance with 3.5.2.

c. The cleanliness boundary for surface ship nitrogen systems encompasses the entirety of the permanently installed storage, distribution, and charging system piping and components.

1.2.3 Helium, helium-oxygen, and hydrogen systems and components that provide life support. The cleanliness boundary encompasses all wetted material providing life support functions.

1.2.4 Other equipment. Equipment that comes in contact with or is used to transfer any fluid from its source to a system or component within any of the boundaries defined in 1.2.1, 1.2.2, and 1.2.3 when such interface is intended to maintain the cleanliness requirements specified herein.

1.2.5 Diver life support equipment. The following diver life support equipment – diving helmets, masks, umbilicals, and items otherwise exempt by Naval Sea Systems Command (NAVSEA) – are cleaned in accordance with MIL-STD-1622.

1.2.6 Submarine demineralized water systems. Demineralized water systems supplying submarine electrolytic oxygen generators (low or high pressure) are cleaned to the level II standard of UIPI 0505-908, Level II and III

Cleanliness for Piping Systems/Equipment (copies of this document are available by emailing

CommandStandards@navy.mil).

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this standard, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL SPECIFICATIONS

TT-I-735 - Isopropyl Alcohol

ZZ-G-710 - Gasket Material, Rubber 35 Durometer Hardness

COMMERCIAL ITEM DESCRIPTIONS

A-A-3174 - Plastic Sheet, Polyolefin

A-A-58020 - Drums, Shipping, Steel with Polyethylene Insert

A-A-59155 - Nitrogen, High Purity, Special Purpose

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-D-16791 - Detergents, General Purpose (Liquid, Nonionic)

MIL-PRF-22191 - Barrier Materials, Transparent, Flexible, Heat-Sealable

MIL-DTL-22606 - Flask and End Plugs, Compressed Gas - Air, Oxygen, and Nitrogen

MIL-PRF-24139 - Grease, Multipurpose, Water Resistant

MIL-DTL-24671 - Cloth, Lint-Free, Flushing and Cleaning

MIL-DTL-24800 - Cleaning Compound - Aqueous - Oxygen Systems Components

MIL-PRF-25567 - Leak Detection Compound, Oxygen Systems

MIL-PRF-27401 - Propellant Pressurizing Agent, Nitrogen

MIL-PRF-27407 - Propellant Pressurizing Agent, Helium

MIL-PRF-27415 - Propellant Pressurizing Agent, Argon

MIL-PRF-27617 - Grease, Aircraft and Instrument, Fuel and Oxidizer Resistant

MIL-DTL-32594 - Sodium Phosphate, Tribasic; Anhydrous, Dodecahydrate, and Monohydrate;

Technical

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-1622 - Cleaning of Shipboard Compressed Air Systems

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DEPARTMENT OF DEFENSE HANDBOOKS

MIL-HDBK-407 - Contamination Control Technology Precision Cleaning Methods and Procedures

(Copies of these documents are available online at https://quicksearch.dla.mil.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

NASA TECHNICAL STANDARDS

MSFC-SPEC-3709 - Specification for Solvent, Cleaning, Trans-1-chloro-3,3,3,-Trifluoropropene, Solstice

(Copies of this document are available online at https://standards.nasa.gov/standard/msfc/msfc-spec-3709.)

NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS

0900-LP-001-7000 - Fabrication and Inspection of Brazed Piping Systems

0924-LP-062-0010 - Submarine Safety (SUBSAFE) Requirements Manual

S6430-AE-TED-010 - Piping Devices and Flexible Hose Assemblies; Volume 1; Technical

Directive

S9074-AR-GIB-010/278 - Requirements for Fabrication Welding and Inspection, and Casting

Inspection and Repair for Machinery, Piping, and Pressure Vessels

S9086-CH-STM-010/074 - NSTM Chapter 074; Volume 1, Welding and Allied Processes

S9086-H7-STM-010/262 - NSTM Chapter 262, Lubricating Oils, Greases, Specialty Lubricants and Lubrication Systems

S9086-RK-STM-010/505 - NSTM Chapter 505, Piping Systems

S9086-SX-STM-010/550 - NSTM Chapter 550, Industrial Gases; Generating, Handling and

Storage

S9086-SY-STM-010/551 - NSTM Chapter 551, Compressed Air Plants and Systems

S9086-WK-STM-010/670 - NSTM Chapter 670, Stowage, Handling and Disposal of Hazardous

General Use Consumables, Volume 1 – Afloat Hazardous Material

Control and Management Guidelines

SS521-AA-MAN-010 - U.S. Navy Diving and Manned Hyperbaric Systems Safety

Certification Manual

SS800-AG-MAN-010/P-9290 - System Certification Procedures and Criteria Manual for Deep

Submergence Systems

ST700-F1-PRO-010 - Instrument and Gage Cleaning for MIL-STD-1330 Applications;

Procedures Manual

TL855-AA-STD-010 - Naval Shipyard Quality Program Manual

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(Copies of these documents are available online via Technical Data Management Information System (TDMIS) at https://mercury.tdmis.navy.mil/ by searching for the document number without the suffix. Refer questions, inquiries, or problems to: DSN 296-0669, Commercial (805) 228-0669. These documents are available for ordering (hard copy) via the Naval Logistics Library (NLL) at https://nll.navsup.navy.mil. For questions regarding the NLL, contact the NLL Customer Service at nllhelpdesk@navy.mil, (866) 817-3130, or (215) 697-2626/DSN 442-2626.)

OD45845 - Metrology Requirements List (METRL)

(Copies of this document are available by emailing CommandStandards@navy.mil.)

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

Method 9060A - Total Organic Carbon

(Copies of this document are available online at www.epa.gov.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI Z358.1 - Emergency Eyewash and Shower Equipment

(Copies of this document are available online at http://webstore.ansi.org/.)

ASTM INTERNATIONAL

ASTM D1193 - Standard Specification for Reagent Water

ASTM D8193 - Standard Test Method for Total Oil and Grease (TOG) and Total Petroleum

Hydrocarbon (TPH) in Water and Wastewater with Solvent Extraction Using Non-

Dispersive Mid-IR Transmission Spectroscopy

ASTM E70 - Standard Test Method for pH of Aqueous Solutions With the Glass Electrode

ASTM F311 - Standard Practice for Processing Aerospace Liquid Samples for Particulate

Contamination Analysis Using Membrane Filters

ASTM G63 - Standard Guide for Evaluating Nonmetallic Materials for Oxygen Service

ASTM G94 - Standard Guide for Evaluating Metals for Oxygen Service

(Copies of these documents are available online at www.astm.org.)

COMPRESSED GAS ASSOCIATIONS, INC. (CGA)

CGA C-1 - Methods for Pressure Testing Compressed Gas Cylinders

CGA C-6.1 - Standard for Visual Inspection of High Pressure Aluminum Compressed Gas Cylinders

CGA C-6.2 - Standard for Visual Inspection and Requalification of Fiber Reinforced High Pressure

Cylinders

CGA G-10.1 - Commodity Specification for Nitrogen

(Copies of these documents are available online at www.cganet.com.)

INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY (IEST)

IEST-STD-CC1246 - Product Cleanliness Levels – Applications, Requirements, and Determination

(Copies of this document are available online at www.iest.org.)

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INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 14644-1 - Cleanrooms and Associated Controlled Environments – Part 1: Classification of Air

Cleanliness by Particle Concentration

ISO 14644-2 - Cleanrooms and Associated Controlled Environments – Part 2: Monitoring to Provide

Evidence of Cleanroom Performance Related to Air Cleanliness by Particle

Concentration

(Copies of these documents are available online at www.iso.org.)

SAE INTERNATIONAL

SAE AS8660 - Silicone Compound, NATO Code Number S-736

(Copies of this document are available online at www.sae.org.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. DEFINITIONS

3.1 Aqueous cleaning solution. A water-based cleaner whose constituents are soluble inorganic compounds such as silicates or phosphates or soluble organic compounds such as non-ionic surfactant or combinations thereof.

Examples of aqueous cleaning solutions include commercial detergents, which generally contain both soluble inorganic and organic compounds, and Navy oxygen cleaner (NOC), which contains only soluble inorganic compounds.

3.2 Blue line. When a cut for a pipe or fitting nears the inner wall, the outer surface turns blue, which is referred to as cutting to the blue line. The blue line results from oxidation caused by the reduced ability of the thinned pipe or fitting to dissipate heat generated by the power tool cutting the surface.

3.3 Clean. The absence of scale, particulate, oil, and grease contaminants at a level below that which adversely affects the operation or reliability of the component or system. The process of cleaning should not affect the form, fit, or function of the item being cleaned.

3.4 Cleaning solvent. Any material that exhibits the capability to dissolve other substances through chemical action and, for the purposes of this document, is 100 percent volatile. Examples include Solstice Performance Fluid, High Purity (PF-HP) (hereafter referred to as Solstice) as specified in MSFC-SPEC-3709, which is non-flammable, and hydrocarbon solvents such as isopropyl alcohol (IPA), which is very flammable.

3.5 Cleanliness level. An established maximum allowable distribution of contamination of a given size and quantity in a specified area or volume. This standard has two cleanliness levels (see 3.5.1 and 3.5.2).

3.5.1 General. General applications comprise the majority of cleaning requirements under this standard. They include oxygen, nitrogen, hydrogen, and helium systems that are not otherwise exempted from general cleanliness level requirements.

3.5.2 Basic. This cleanliness level is used for cleaning low-pressure electrolyzers, associated piping, and support gas piping systems that do not pose a risk of fire and can tolerate a lower cleanliness level due to their design and usage. This cleanliness level meets the requirements of MIL-STD-1622 for general applications. Appendix G contains basic cleanliness procedures and acceptance criteria.

3.6 Clean lint-free cloth. A clean lint-free cloth in accordance with MIL-DTL-24671 is used for local cleaning or wiping surfaces to evaluate loss of cleanliness. The cloth should be free of chemicals that could pose a compatibility, flammability, or toxicity hazard considering the specific application.

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3.7 Cleanroom. A permanent area where a high degree of cleanliness is continuously achieved by employing varying degrees of control and monitoring of environmental items such as ventilation, filtration, temperature, humidity, pressure, personnel, clothing, and room maintenance. Refer to 5.1 for cleanroom requirements.

3.8 Components. Items such as valves, fittings, gauges, regulators, and repair parts in the systems.

3.9 Contractor. Any person not employed by the U.S. Navy performing services onboard ships or at shore base facilities on components or systems defined by 1.2.

3.10 Controlled area. An area where a high degree of cleanliness is temporarily achieved and maintained by the use of temporary boundaries, air filtration, and the enforcement of strict controls on personnel access, operations, and area maintenance. Controlled areas are most often used for in-place maintenance and repair of shipboard systems.

Refer to 5.1 for controlled area requirements.

3.11 Dew point. The measure of dryness or wetness of a gas. It is defined as the temperature at which gas becomes saturated with water vapor causing condensation when cooled at constant pressure. Dew point temperature is measured at atmospheric pressure.

3.12 Final cleaner. An aqueous cleaning solution or a cleaning solvent used for final flushing of piping systems or final precision cleaning of components and parts.

3.13 Halogenated solvent. Any solvent whose chemical structure contains bromine, chlorine, fluorine, or iodine. Most halogenated solvents are non-flammable, and many are very toxic. All NAVSEA-approved halogenated solvents contain fluorine, some also contain chlorine, and none contain bromine or iodine.

3.14 Helium. Gaseous helium as specified in 4.7.2.

3.15 Maximum operating pressure. The highest pressure that can exist in a system or subsystem under normal

(non-casualty) operating conditions. This pressure is determined by such influences as pressure regulating valve set pressure, maximum pressure at the system source such as compressed gas bank pressure or sea pressure, and pump or compressor shut-off pressure for closed systems. For constant pressure systems, such as regulated compressed gas systems, the term nominal operating pressure has been used to designate the steady state operating condition. Where this type of pressure rating is applied, for the purpose of the requirements stated herein, it may be substituted as the maximum operating pressure.

3.16 Membrane filter. An absolute rated filter where the filter retains all particles whose smallest dimension is equal to or greater than the specified rating.

3.17 Nitrogen. Gaseous nitrogen as specified in 4.7.3.

3.18 Objective quality evidence. Any statement of fact, either quantitative or qualitative, pertaining to the quality of a product or service based on observations, measurements, or tests that can be verified. Evidence will be expressed in terms of specific quality requirements or characteristics. These characteristics are identified in drawings, specifications, and other documents that describe the item, process, or procedure.

3.19 Organic. Any chemical compound containing carbon. For the purposes of this document, the organic compounds of interest are hydrocarbon compounds containing carbon and hydrogen, and fluorocarbon compounds containing carbon and fluorine. Hydrocarbon materials such as lubricating oils are very flammable in oxygen, while fluorocarbon materials such as MIL-PRF-27617 grease demonstrate good compatibility with oxygen.

3.20 Oxygen clean. The verifiable absence of particulate, fiber, oil, grease, and other contaminants determined through the use of qualitative and quantitative cleanliness measurement techniques. An oxygen, helium, helium-oxygen, nitrogen, nitrogen-oxygen, or hydrogen piping system or component successfully cleaned in accordance with this standard is considered oxygen clean.

3.21 Oxygen-enriched. Any fluid containing greater than 25 percent oxygen by volume in accordance with

ASTM G63 and ASTM G94.

3.22 Precision cleaning. The act of removing unwanted contaminants to better than visibly clean. Precision cleaning is accomplished using a controlled and verifiable process with cleaning agents that satisfy the applicable cleanliness requirements.

3.23 Pre-cleaner. Any aqueous cleaning solution or cleaning solvent used to clean parts to visually clean.

Examples include NOC, dissolved tribasic sodium phosphate (TSP), isopropyl alcohol, and non-ionic detergent

(NID) mixed with water or NOC or TSP.

3.24 Sample. A representative amount of cleaning solvent, cleaning solution, rinse water, or pressurized gas collected in clean containers at selected locations obtained to verify the performance of the cleaning process.

3.25 Surfactant. A surface wetting agent that reduces interfacial tension between a liquid and a solid.

3.26 Validation. The demonstration of the ability to perform a technique or process with verifiable results at a regular interval.

3.27 Vendor. Any person not employed by the U.S. Navy that performs services as specified in this standard at a facility not owned or operated by the government.

3.28 Water. Water as specified in 4.2.

3.29 Wetted surface. Any surface that comes in direct contact with the system fluid.

4. GENERAL REQUIREMENTS

4.1 Oxygen safety precautions. Personnel involved with cleaning and testing systems defined in 1.2 shall be qualified as specified in 5.14. They shall also be familiar with the applicable safety precautions for cleaning and testing fluids as specified herein before conducting any work. The removal of organic and particulate contamination from oxygen and oxygen-enriched systems is absolutely necessary to prevent a fire hazard. Failure to thoroughly clean oxygen systems has resulted in catastrophic fires. Additionally, failure to use approved cleaners has resulted in the introduction of flammable and toxic contaminants that have resulted in personnel injury. While working with oxygen clean systems, the safety precautions in accordance with S9086-SX-STM-010/550 shall be observed.

4.2 Water.

4.2.1 Applicability. Three grades of water, A, B, and C, in descending order of purity, are associated with preparing and diluting cleaning solutions, flushing, rinsing, and testing, and are defined in table I. Water purity requirements specified throughout this standard are minimum requirements and do not preclude the use of water of greater purity.

TABLE I. Grades of water.

Item Grade

A 1/ B 1/ C 2/

Chloride ion, maximum, parts per million (ppm) 0.1 1.0 35

Conductivity, maximum, micromhos/cm 3/ 2.5 20 550

Resistivity, minimum, ohm-cm 3/ 400K 50K 1.8K pH range 4/ 6.0 to 8.0 - -

Visual clarity No turbidity, oil, or sediment

NOTES:

1/ Demineralized water meeting the requirements of ASTM D1193, type II, satisfies grade A or B requirements.

2/ Potable water and municipal water generally meet grade C requirements.

3/ Measure either conductivity or resistivity; resistivity is the inverse of conductivity.

4/ When the conductivity of grade A water is 0.25 micromhos/cm or less, pH measurements are not required.

4.2.2 Disposal. Disposal of water shall be in accordance with local, state, and federal regulations.

4.2.3 Compatibility. Appendix A gives the compatibility of hot water with various materials. Where incompatibility exists, process changes such as rinsing with cooler water, shorter rinse durations, or immediate drying of wet surfaces may need to be considered. Where specific information is lacking, perform compatibility testing as specified in A.3.1 of Appendix A.

4.3 Aqueous cleaning solutions.

4.3.1 Navy oxygen cleaner (NOC).

4.3.1.1 Applicability. NOC is an aqueous alkaline cleaning solution approved for use as a pre-cleaner or final cleaner for all compatible piping and components other than liquid oxygen generating plants. It may be used for liquid oxygen generating plant piping and components provided the aqueous cleaning process specified herein can be successfully accomplished. NOC shall be in accordance with MIL-DTL-24800.

4.3.1.2 Safety precautions. The safety precautions recommended in the vendor’s safety data sheet (SDS) shall be followed along with the following precautions recommended by the Navy and Marine Corps Public Health Center

(NMCPHC) or the local Industrial Hygenist (IH).

a. Skin contact with NOC will result in irritation and chemical burns. Wear impervious protection clothing constructed of neoprene or other material of equivalent resistance to penetration so as to prevent skin contact. Use elbow-length gloves (with cuffs) as minimum protection any time open containers of the cleaning agent are handled.

Wash potentially exposed skin areas with soap and water at breaks, and at the conclusion of the operation. Do not use organic solvents for this purpose. Thoroughly clean protective garments at the conclusion of the operation and store for reuse. Remove clothing that becomes contaminated as soon as possible and thoroughly clean before reuse.

Seek prompt medical assistance should a rash, chemical burn, or other adverse effect be experienced that may be related to working with NOC. Do not store or consume food and tobacco in areas where they could be contaminated with NOC.

b. Eye contact with NOC could result in chemical burns. Wear chemical safety goggles for all operations where eye contact with NOC could occur. Additionally, use a full-length face shield for any operation where splashing of the material could occur. In the event of eye contact, personnel should flush their eyes thoroughly with fresh water for not less than 15 minutes, then seek prompt medical attention. An eye wash system conforming to the design requirements of ANSI Z358.1 shall be in the immediate vicinity of all operations. Eye wash systems shall provide not less than 15 minutes of water for emergency flushing.

c. Overexposure to mists or vapors from NOC may result in sneezing, coughing, respiratory system irritation, and possibly chemical burns and subsequent edema in the upper airways. Based on off-gas testing at temperatures up to 180 degrees Fahrenheit (°F), such a possibility is unlikely, considering the magnitude and frequency of use. In the event any adverse health effects are experienced, cease operations involving NOC and consult the cognizant medical department representative for additional guidance.

4.3.1.3 Disposal. Disposal of NOC shall be in accordance with local, state, and federal regulations. If neutralizing NOC, dilute at least 4:1 with water before adding acid to prevent forming a precipitate.

4.3.1.4 Compatibility. Appendix A gives the compatibility of NOC with various materials. Where specific information is lacking, perform compatibility testing as specified in A.3.1 of Appendix A. NOC used to clean aluminum or anodized aluminum shall be diluted 50 percent with water as specified in 4.3.1.6.

4.3.1.5 Inspection prior to use. The following inspections shall be performed prior to using NOC.

a. A shake test as specified in 5.13.2.2 and a visual inspection as specified in 5.13.3.2 shall be performed.

NOC that fails either inspection due to the presence of oil shall be rejected and returned to the vendor. NOC that fails the visual inspection due to the presence of particulate or fiber shall be either filtered with a 5-micrometer nominal or finer filter to remove the suspended particulate or fiber or rejected and returned to the vendor.

b. Activities verifying cleanliness using the non-volatile residue (NVR) by filtration procedure of Appendix B shall sample one container or drum of each NOC lot or batch to determine the background NVR. NOC from different lots or batches may be sampled from storage tanks, such as flushing rigs, to determine the background

NVR. For NOC fresh from a container, drum, or tank that has not been used, the baseline NVR shall be no greater than 10 milligrams per liter. NOC with greater than 10 milligrams per liter NVR shall be rejected and returned to the vendor or filtered with a 5 micrometer or finer filter and verified less than 10 milligrams per liter NVR prior to use.

c. Government purchases of NOC are origin-inspected, origin-accepted with a Certificate of Analysis for each lot maintained by the Defense Logistics Agency. Vendors purchasing NOC should request a Certificate of Analysis with each delivery. Any NOC returned to a vendor because of a quality deficiency shall be noted (see 6.3).

4.3.1.6 Dilution. NOC shall be diluted as follows:

a. Concentration: NOC can be diluted with water up to 50 percent. NOC shall be diluted 50 percent with grade A or B water when cleaning aluminum or anodized aluminum.

b. Water quality: The preferred quality of water is 5 micrometer nominal or finer filtered grade A water. For long term use in cleaning equipment, such as an ultrasonic cleaning tank, parts washer, or flushing rig, grade B water may be used with a 1 micrometer nominal or finer filter installed. For short term use, such as a few hours, grade B water may be used with no filter.

c. Order for mixing: In order to yield a more stable solution that will extend the life of the cleaner, water should be added to NOC rather than adding NOC to water.

4.3.1.7 Use of NOC in previously used equipment. For cleaning equipment previously used with other than

NOC, the following actions should be taken to minimize and evaluate for the possibility of the NOC reacting with the residue left behind.

a. Fill the cleaning equipment with NOC diluted 25 to 50 percent with grade B water.

b. Operate the cleaning equipment covered for 4 hours at 140 to 160 °F.

c. Visually inspect the NOC for foam and precipitate. Visually inspect the equipment for milky white deposits. Some white deposits at the fluid-air boundary are acceptable.

d. If precipitate is visible in the NOC, the NOC foams, or milky white deposits are visible on the equipment in areas continuously wetted with NOC, discard the NOC solution, remove the deposits as specified in 4.3.1.7.e, and repeat the process.

e. Deposits can be removed by soaking in hot water or soaking and scrubbing with commercial white vinegar or a warm (up to 110 °F) 10 to 16 percent citric acid solution followed by a water rinse. A 10 to 16 percent citric acid solution can be prepared by adding 12 to 20 ounces of powdered citric acid (CAS No. 77-92-9) to one gallon of water.

4.3.1.8 Use for extended periods. Extended use of NOC should be in covered equipment to minimize evaporation. NOC can be recycled using filtration, and continuously used or reused, provided the following conditions are satisfied:

a. A shake test as specified in 5.13.2.2 reveals no excessive foam.

b. A visual inspection as specified in 5.13.3.2 reveals no particulate, fiber, or oil.

c. A hydrocarbon or NVR inspection as specified in 5.13.2 reveals less than 5 ppm above baseline.

d. An alkalinity test as specified in 5.13.5 indicates a satisfactory result. As the alkalinity of NOC is depleted in use, the volume of NOC required to obtain the blue end-point specified in 5.13.5 increases. When the alkalinity test measures 35 to 40 milliliters of NOC, the NOC is at risk of developing an insoluble precipitate. The NOC should either be replaced, or a portion of the low alkalinity NOC removed and replaced with fresh NOC to restore alkalinity. If evaporation concentrates the NOC causing the alkalinity test to measure less than 10 milliliters of

NOC, the NOC should be diluted with water as specified in 4.3.1.6 to restore the alkalinity to a nominal measured range of 15 to 30 milliliters of NOC. Do not attempt to adjust the alkalinity of 50 to 100 percent concentrated NOC by adding acid; an immediate gel or precipitate will develop. Alkalinity of NOC in use or stored in cleaning equipment should be checked weekly until the alkalinity test measures about 30 milliliters of NOC. Then, more frequent analysis should be performed to ensure an insoluble precipitate does not form.

4.3.1.9 Filtration. For long term use in cleaning equipment such as large ultrasonic tanks or parts washers, a filter sized at about 1-micrometer nominal should be installed. For use in a flushing rig, a 5-micrometer nominal or finer filter shall be installed, and it is recommended that a filter sized at about 1-micrometer nominal be installed. A

5-micrometer filter prevents introducing significant contamination back into the system. A 1-micrometer filter allows recycling and extending the use of NOC. It is also recommended that for flushing applications, a strainer be installed upstream of the filter to remove large debris that can prematurely clog the filter. Filters used for the first time shall be checked for extractable organic material by recirculating with clean NOC at 140 to 160 °F for not less than 1 hour and then verifying organic cleanliness as specified in 5.13.2. Checking for extractable organic material of filters is not required for filters from the same vendor and of the same material that previously tested satisfactorily.

A suitable filter material is thermally bonded, pleated polypropylene containing no plasticizer or adhesive. The major advantage of disposable polypropylene filter cartridges is ease of use. Cleaning stainless steel reusable filters can be difficult and time consuming. The large soil holding capacity of disposable filter cartridges can often balance the cost of using smaller soil holding capacity stainless steel filters requiring frequent cleaning. Filter housings should be configured with a vent on the top of the housing to allow removing oil that has separated from the NOC.

Verify with the manufacturer that the temperature, pressure, and flow ratings of any filters are adequate for the intended application. Disposal of used filters or separated oil shall be in accordance with local, state, and federal regulations.

4.3.1.10 Stowage. NOC should be stored in covered containers to minimize evaporative losses. Stowage of heated NOC for several days should only be in corrosion resistant metal, Polytetrafluoroethylene (PTFE), or

PTFE-lined glass containers. Long term stowage of heated NOC in plastic (other than Teflon), rubber, or glass containers will result in cleaner degradation. Unheated NOC may be stowed in plastic or plastic lined containers provided the container has been checked for extractable organic material. This is accomplished by filling the container with NOC for not less than 10 days and verifying organic cleanliness as specified in 5.13.2. Checking for extractable organic material of containers is not required for containers from the same vendor and of the same material that previously tested satisfactorily. Experience indicates that NOC can be successfully stored in aged uncolored or clear high-density polyethylene (HDPE) or polypropylene plastic containers. NOC can also be stored in steel containers having an unplasticized low density polyethylene (LDPE) liner that is not adhesively bonded to the steel container similar to A-A-58020. Stowage of NOC in colored plastic containers may contaminate the cleaner and adversely affect the NVR analysis results. NOC allowed to dry on glass will result in a hard insoluble residue.

Wide mouth glass sample bottles with external safety coatings and PTFE lined caps are acceptable, as are sampling containers manufactured from PTFE, PTFE-lined glass, PTFE lined plastic, or stainless steel. Bulk shipboard stowage of NOC shall be in accordance with S9086-WK-STM-010/670 for alkalies.

4.3.2 Tribasic sodium phosphate (TSP).

4.3.2.1 Applicability. TSP is a solid crystalline material mixed with water to prepare an aqueous alkaline cleaning solution approved for use as a pre-cleaner or final cleaner for all compatible piping and components other than liquid oxygen generating plants. It may be used for liquid oxygen generating plant piping and components provided the aqueous cleaning process specified herein can be successfully accomplished. TSP shall be in accordance with MIL-DTL-32594, type I or II, or equal. Type II is recommended because it is less susceptible to precipitation.

4.3.2.2 Safety precautions. The safety precautions recommended in the vendor’s SDS shall be followed as well as the following:

a. TSP is a solid, crystalline material that has a caustic action on skin, eyes, and mucous membranes.

Repeated or prolonged contact with the solid material or its solution shall be avoided.

b. Skin contact with TSP will result in irritation of the skin, including redness and burning of the skin, and other skin damage. Wear impervious protection clothing (gloves, aprons or coveralls, boots) constructed of neoprene or other material of equivalent resistance to penetration so as to prevent skin contact. If skin contact occurs, exposed areas shall be washed with large amounts of fresh water. Remove clothing that becomes contaminated as soon as possible and launder before reuse. If skin is damaged, seek immediate medical attention. If skin is not damaged and symptoms persist, seek medical attention. If irritating dust or solution mist is present, approved respirators shall be worn to avoid inhalation.

c. Eye contact with TSP could result in permanent eye injury, including injury of the cornea causing blindness.

Symptoms include stinging, tearing, redness, and swelling of eyes. Wear chemical safety goggles for all operations where eye contact with TSP could occur. Additionally, use a full-length face shield for any operation where splashing of the material could occur. In the event of eye contact, personnel should flush their eyes thoroughly with fresh water for not less than 15 minutes, then seek prompt medical attention. An eye wash system conforming to the design requirements of the ANSI Z358.1 shall be in the immediate vicinity of all operations. Eye wash systems shall provide not less than 15 minutes of water for emergency flushing.

d. In the event any adverse health effects are experienced, cease operations involving TSP and consult the cognizant medical department representative for additional guidance.

4.3.2.3 Disposal. Disposal of TSP shall be in accordance with local, state, and federal regulations.

4.3.2.4 Compatibility. Appendix A gives the compatibility of TSP with various materials. Where specific information is lacking, perform compatibility testing as specified in A.3.1 of Appendix A.

4.3.2.5 Solution preparation. Prepare the TSP cleaning solution by dissolving 2 pounds of type I or 4.5 pounds of type II TSP with 5 gallons of grade B water at 160 to 180 °F. In order to prevent a violent reaction and to more completely mix the TSP, add the TSP to the water; do not add water to the TSP. The solution shall be circulated until the TSP is dissolved prior to exposing the solution to a system or component.

4.3.2.6 Stowage. If a TSP stowage tank is not large enough, do not mix a solution stronger than as specified in

4.3.2.5 and attempt to dilute it in the piping system. Failure to maintain the temperature of a solution stronger than as specified in 4.3.2.5 at 160 to 180 °F can result in the TSP precipitating and developing a hardened mass. This hardened mass is difficult, if not impossible, to remove. The preferred stowage tank material is stainless steel. Bulk shipboard stowage of TSP shall be in accordance with S9086-WK-STM-010/670 for alkalies.

4.3.3 Non-ionic detergent (NID).

4.3.3.1 Applicability. NID is a concentrated non-ionic hydrocarbon surfactant that is mixed with water, NOC, or TSP solutions to prepare an aqueous detergent cleaning solution acceptable for use as a pre-cleaner.