1.08_MIL-STD-1330D_N6319019RCSU012.pdf

INCH-POUND

MIL-STD-1330D(SH)

20 September 1996

SUPERSEDING

MIL-STD-1330C(SH)

1 February 1985 (See 6.6)

DEPARTMENT OF DEFENSE

STANDARD PRACTICE FOR

PRECISION CLEANING AND TESTING OF

SHIPBOARD OXYGEN, HELIUM, HELIUM-OXYGEN,

NITROGEN, AND HYDROGEN SYSTEMS

AMSC FSC 4730

DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

Downloaded from http://www.everyspec.com

20 September 1996 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 military standard is for use by naval activities and private firms performing services as prime or sub-contractors for Naval Sea Systems Command.

3. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to:

Commander, SEA 03R42, Naval Sea Systems Command, 2531 Jefferson Davis Highway, Arlington, VA 22242-5160, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

iii

CONTENTS

PARAGRAPH PAGE

1. SCOPE

1.1 Scope

1.2 Applicability

2. APPLICABLE DOCUMENTS

2.1 General

2.2 Government documents

2.2.1 Specifications, standards, and handbooks

2.2.2 Other Government documents, drawings, and publications... 3

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

3.6 Clean lint-free cloth

3.7 Cleanroom

3.8 Components

3.9 Contractor

3.10 Controlled area

3.11 Critical applications

3.12 Dew point

3.13 Final cleaner

3.14 Halogenated solvent

3.15 Helium

3.16 Maximum operating pressure

3.17 Membrane filter

3.18 Nitrogen

3.19 Objective quality evidence

3.20 Organic

3.21 Oxygen clean

3.22 Oxygen enriched

3.23 Precision cleaning

3.24 Pre-cleaner

3.25 Sample

3.26 Surfactant

3.27 Validation

3.28 Vendor

3.29 Water

3.30 Wetted surface

4. GENERAL REQUIREMENTS

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)

4.3.2 Tribasic sodium phosphate (TSP)

iv

CONTENTS - Continued

PARAGRAPH PAGE

4.3.3 Non-ionic detergent (NID)

4.4 Cleaning solvents

4.4.1 NAVSEA approved halogenated solvents

4.4.2 Isopropyl alcohol

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

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

4.8 Cleaning silver-brazed piping

4.9 Lubricants

5. DETAILED REQUIREMENTS

5.1 Facility requirements

5.1.1 Structure

5.1.2 Maintenance

5.1.3 Temperature and humidity

5.1.4 Air filtration

5.1.5 Ventilation and air pressure

5.1.6 Personnel clothing

5.1.7 Tools and equipment

5.2 Aqueous component cleaning process

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

5.4 Cleaning and calibration of instruments and gauges

5.5 Aqueous system cleaning process

5.5.1 Applicability

5.5.2 Material and equipment

5.5.3 System preparation

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

v

CONTENTS - Continued

PARAGRAPH PAGE

5.6.2 Inspection

5.6.3 KOH removal

5.7 Flushing of ships service demineralized water

piping systems

5.7.1 Applicability

5.7.2 Material and equipment

5.7.3 Flush

5.7.4 Visual inspection

5.8 Solvent system cleaning processes

5.8.1 Applicability

5.8.2 Oxygen-nitrogen plants

5.8.3 Oxygen-nitrogen plant piping

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

5.10.2 Purge

5.11 Piping repairs between flask and isolation valve

5.11.1 Applicability

5.11.2 System preparation

5.11.3 Maintenance of purge

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

5.13.2 Hydrocarbon and NVR analysis methods

5.13.3 Particulate inspection methods

5.13.4 pH analysis

5.13.5 NOC alkalinity

5.13.6 Detection of hydrocarbon contamination by swipe

5.14 Personnel qualification and training

5.14.1 Applicability

5.14.2 Course of instruction

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

5.16.2 Identification

5.16.3 Storage

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

vi

CONTENTS - Continued

PARAGRAPH PAGE

6. NOTES

6.1 Intended use

6.2 Issue of DoDISS

6.3 NAVSEA approval and direction

6.4 Safety precautions

6.5 Subject term (key word) listing

6.6 Changes from previous issue

FIGURES

1. Typical certification sticker

2. Typical certification tag

3. Filtration for determining NVR in NOC by gravimetric

TABLES

I. Grades of water II. Cleanroom and controlled area requirements III. Applicability matrix for flush duration and back flush IV. Solvent cleaning processes V. Hydrostatic testing VI. Joint tightness testing VII. Seat tightness testing VIII. Pressure drop testing IX. Containment and purge requirements X. Hydrocarbon and NVR analysis methods XI. Film for packaging XII. In-process operation inspections XIII. Metallic material compatibility XIV. Rubber material compatibility XV. Plastic material compatibility XVI. Rubber compatibility criteria...........................57/58 XVII. Plastic compatibility criteria..........................57/58 XVIII. NAVSEA approved halogenated solvents

APPENDICES

A. Material compatibility B. Analysis of non-volatile residue in Navy oxygen cleaner by gravimetric C. Test procedure for solvent extraction of an aqueous inorganic cleaner D. Analysis of hydrocarbon oil and grease in HCFC-225s solvent by infrared spectroscopy E. NAVSEA approved halogenated solvents

1. SCOPE

1.1 Scope. This standard provides the requirements for precision cleaning and testing of oxygen or oxygen-enriched systems and components; oxygen generating plants including nitrogen, hydrogen, and demineralized water support systems and components; and helium, helium-oxygen, and hydrogen life support systems and components. Compressed air systems directly supporting oxygen generating equipment are cleaned in accordance with MIL-STD-1622. Each activity should implement the applicable requirements of this document through a locally prepared and approved procedure. Activities subject to additional quality assurance requirements such as NAVSEA SS800-AG-MAN-010/P-9290 or NAVSEA SS521-AA-MAN-010 should obtain procedure approval from the applicable certifying activity.

1.2 Applicability. This standard is applicable to all surface ships, submarines, and supporting shore base facilities which 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.

1.2.2 Hydrogen, nitrogen, and demineralized water systems and components that support gaseous or liquid oxygen generating equipment.

1.2.2.1 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 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 dedicated to oxygen generating equipment.

(b) The last check valve or normally shut isolation valve that separates the nitrogen supply flasks from the oxygen generator when such supply is not dedicated to oxygen generating equipment.

Remaining portions of the nitrogen system are cleaned in accordance with MIL-STD-1622.

1.2.2.3 The cleanliness boundary for surface ship nitrogen systems includes any portion of the system that can be used to pressurize or purge the oxygen system, oxygen system components, oxygen-nitrogen producer, and storage equipment.

Remaining portions of the nitrogen systems are cleaned in accordance with

MIL-STD-1622.

1.2.2.4 The cleanliness boundary for demineralized water 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 ships demineralizer.

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 except the following: diving helmets, masks, umbilicals and items otherwise exempted by NAVSEA which are cleaned in accordance with MIL-STD-1622.

1.2.4 Equipment which 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 Open ended applications constructed of material that is configured and operated at a pressure that represents a fire hazard in the presence of an oxygen or oxygen-enriched atmosphere when determined in accordance with the guidelines of ASTM G 63 and ASTM G 94. For open-ended piping or configurations constructed of material and operated in an oxygen or oxygen-enriched atmosphere at a pressure that does not propagate a flame when determined in accordance with the guidelines of ASTM G 63 and ASTM G 94, clean in accordance with MIL-STD-1622 for diver applications; otherwise use best commercial practice to remove loose scale, dust, grit, filings, oil, and grease. For information, copper, copper-nickel, bronze, brass, and monel will not propagate a flame in an oxygen or oxygen-enriched atmosphere at pressures up to 7500 pounds per square inch (lb/in ).2

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3, 4, and 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, and 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 listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2).

SPECIFICATIONS

FEDERAL

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

L-P-378 - Plastic Sheet and Strip, Polyolefin.

O-S-642 - Sodium Phosphate, Tribasic, Anhydrous;

Dodecahydrate; and Monohydrate; Technical.

BB-N-411 - Nitrogen, Technical.

TT-I-735 - Isopropyl Alcohol.

ZZ-R-710 - Rubber Gasket Material, 35 Durometer Hardness.

DEPARTMENT OF DEFENSE

MIL-S-8660 - Silicone Compound, NATO Code Number S-736.

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

MIL-B-22191 - Barrier Materials, Transparent, Flexible, Heat-

Sealable.

MIL-F-22606 - Flask Compressed Gas and End Plugs for Air, Oxygen and Nitrogen.

MIL-G-24139 - Grease, Multipurpose, Water Resistant.

MIL-C-24671 - Cloth, Lint-Free, Flushing and Cleaning.

MIL-L-25567 - Leak Detection Compound, Oxygen Systems. (Metric) MIL-P-27407 - Propellant Pressurizing Agent Helium.

MIL-G-27617 - Grease, Aircraft and Instrument, Fuel and Oxidizer

Resistant.

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

Components.

STANDARDS

FEDERAL

FED-STD-209 - Airborne Particulate Cleanliness Classes in

Cleanrooms and Clean Zones.

DEPARTMENT OF DEFENSE

MIL-STD-278 - Welding and Casting Standard.

MIL-STD-1246 - Product Cleanliness Levels and Contamination

Control Program.

HANDBOOKS

DEPARTMENT OF DEFENSE

MIL-HDBK-407 - Contamination Control Technology Precision Cleaning

Methods and Procedures.

(Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

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 are those cited in the solicitation.

PUBLICATIONS

NAVAL SEA SYSTEMS COMMAND (NAVSEA)

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

Safety Certification Manual.

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

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

S6430-AE-TED-010 - Technical Directive For Piping Devices, Flexible Hose Assemblies.

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

Systems.

0902-018-2010 - General Overhaul Specifications for Deep Diving

SSBN/SSN Submarines.

0987-LP-022-3010 - In-Place and On-Site Calibration of Pressure

Instruments in Oxygen Gas Systems (Other Than Gas Generating Plants).

S9086-CH-STM-010/ - Welding and Allied Processes.

CH-074 V1

S9086-H7-STM-010/ - NSTM, Lubricating Oils, Greases, Hydraulic CH-262 Fluids and Lubrication Systems.

S9086-RK-STM-010/ - NSTM, Piping Systems.

CH-505

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

CH-551

S9086-SX-STM-010/ - NSTM, Industrial Gases Generating, Handling and CH-550 Storage.

S9086-WK-STM-010/ - NSTM, Stowage, Handling, and Disposal of CH-670 Hazardous General Use Consumables.

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 the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2).

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM D 1193 - Standard Specification for Reagent Water.

(DoD adopted) ASTM D 2579 - Standard Test Method for Total Organic Carbon in

Water. (DoD adopted) ASTM D 3921 - Standard Test Method for Oil and Grease and

Petroleum Hydrocarbons in Water.

ASTM E 70 - Standard Test Method for pH of Aqueous Solutions With the Glass Electrode. (DoD adopted) ASTM F 311 - Standard Practice for Processing Aerospace Liquid

Samples for Particulate Contamination Analysis Using Membrane Filters.

ASTM F 331 - Standard Test Method for Nonvolatile Residue of Halogenated Solvent Extract from Aerospace Components (Using Rotary Flash Evaporator).

ASTM G 63 - Standard Guide for Evaluating Nonmetallic Materials for Oxygen Service.

ASTM G 94 - Standard Guide for Evaluating Metals for Oxygen Service.

(Application for copies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)

COMPRESSED GAS ASSOCIATION (CGA)

CGA C-1 - Methods for Hydrostatic Testing of Compressed Gas

Cylinders.

CGA C-6.1 - Standards for Visual Inspection of High Pressure

Aluminum Compressed Gas Cylinders.

CGA C-6.2 - Guidelines for Visual Inspection and Requalification of Fiber Reinforced High Pressure Cylinders.

(Application for copies should be addressed to the Compressed Gas Association, Inc., 1235 Jefferson Davis Highway, Arlington, VA 22202)

2.4 Order of precedence. 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. An aqueous cleaning solution is 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. Clean refers to 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. A cleaning solvent is 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 halogenated solvents such as HCFC-141b which is non-flammable and hydrocarbon solvents such as isopropyl alcohol (IPA) which is very flammable.

3.5 Cleanliness level. A cleanliness level is an established maximum allowable distribution of contamination of a given size and quantity in a specified area or volume.

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

3.7 Cleanroom. A cleanroom is 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. Components refers to items such as valves, fittings, gauges, regulators, and repair parts in the systems.

3.9 Contractor. A contractor is any person not employed by the U.S. Navy performing services on-board ships or at shore base facilities on components or systems defined by 1.2.

3.10 Controlled area. A controlled area is 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 Critical applications. Critical applications are systems or components requiring more detailed cleanliness and packaging requirements than generally specified because of unique operating parameters and environments. In the past, some saturated diving systems have been classified as critical applications because of the increased toxicity hazard associated with high partial pressure environments. Unless directed by NAVSEA or the Type Commander, critical requirements may not be used.

3.12 Dew point. Dew point is 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.

3.13 Final cleaner. A final cleaner is an aqueous cleaning solution or a cleaning solvent used for final flushing of piping systems or final precision cleaning of components and parts.

3.14 Halogenated solvent. A halogenated solvent is 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.

3.15 Helium. Helium refers to gaseous helium as specified in 4.7.2.

3.16 Maximum operating pressure. The maximum operating pressure is 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.

3.17 Membrane filter. A membrane filter refers to an absolute rated filter where the filter retains all particles whose smallest dimension is equal to or greater than the specified rating.

3.18 Nitrogen. Nitrogen refers to gaseous nitrogen as specified in 4.7.3.

3.19 Objective quality evidence. Objective quality evidence is any statement of fact, either quantitative or qualitative, pertaining to the quality of a product or service based on observations, measurements, or tests which 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 which describe the item, process, or procedure.

3.20 Organic. Organic refers to 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-G-27617 grease demonstrate good compatibility with oxygen.

3.21 Oxygen clean. Oxygen clean is 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.

3.22 Oxygen enriched. Oxygen enriched refers to any fluid containing greater than 25 percent oxygen by volume in accordance with ASTM G 63 and ASTM G 94.

3.23 Precision cleaning. Precision cleaning is 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.

3.24 Pre-cleaner. A pre-cleaner is any aqueous cleaning solution or cleaning solvent used to clean parts to visually clean. Examples include Navy oxygen cleaner (NOC), dissolved tribasic sodium phosphate (TSP), isopropyl alcohol, and non-ionic detergent (NID) mixed with water or NOC or TSP.

3.25 Sample. Sample is 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.

3.26 Surfactant. A surfactant is a surface wetting agent which reduces interfacial tension between a liquid and a solid.

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

3.28 Vendor. A vendor is 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.

3.29 Water. Water refers to water as specified in 4.2.

3.30 Wetted surface. A wetted surface is 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 NAVSEA S9086-SX-STM-010/CH-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, ppm 0.1 1.0 35

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

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

Visual clarity No turbidity, oil, or sediment

1/ Demineralized water meeting the requirements of ASTM D 1193, 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. Follow the safety precautions recommended in the vendor's material safety data sheet (MSDS) and the following precautions recommended by the Navy Environmental Health Center (NEHC).

(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 which 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 which 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 worker's goggles for all operations where eye contact with NOC could occur. 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 American National Standards Institute (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) Over exposure 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 which fails either inspection due to the presence of oil shall be rejected and returned to the vendor. NOC which 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 which has not been used, the baseline NVR shall be no greater than

10 milligrams per liter (mg/L). NOC with greater than 10 mg/L NVR shall be rejected and returned to the vendor or filtered with a 5 micrometer or finer filter and verified less than 10 mg/L 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 which 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 parts per million (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 (mL) 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 mL 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 mL 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 mL 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 rating of any filter is 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, Teflon, or Teflon 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 which 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 Teflon lined caps are acceptable, as are sampling containers manufactured from Teflon, Teflon lined glass, Teflon lined plastic, or stainless steel. Bulk shipboard stowage of NOC shall be in accordance with S9086-WK-STM-010/CH-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 O-S-642, type I or II, or equal. Type II is recommended because it is less susceptible to precipitation.

4.3.2.2 Safety precautions. Follow the safety precautions recommended in the vendor's material safety data sheet and the following:

(a) TSP is a solid, crystalline material which 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) Chemical safety goggles or face shield, rubber gloves, and rubber aprons or coveralls shall be worn to prevent skin contact. 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 American National Standards Institute (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) If skin contact occurs, exposed areas shall be washed with large amounts of fresh water. If irritating dust or solution mist is present, approved respirators shall be worn to avoid inhalation.

(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 harden 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/CH-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. NID shall be in accordance with MIL-D-16791, type I, or commercial equivalent, such as Triton X- 100.

4.3.3.2 Safety precautions. Follow the safety precautions recommended in the vendor's material safety data sheet (MSDS). In the event any adverse health effects are experienced, cease operations involving NID and consult the cognizant medical department representative for additional guidance.

4.3.3.3 Disposal. Disposal of NID shall be in accordance with local, state, and federal regulations.

4.3.3.4 Compatibility. Appendix A gives the compatibility of NID solutions with various materials. The compatibility of solutions of NID with NOC or TSP shall refer to the respective compatibility tables for NOC or TSP specified in appendix A. If necessary, perform compatibility testing as specified in A.3.1 of appendix A.

4.3.3.5 Solution preparation. Prepare NID solution by adding 0.1 to 0.5 ounces of NID to each gallon of water. Prepare NOC and NID solution by adding 0.1 to 0.5 ounces of NID to each gallon of NOC diluted 50 percent with water. Prepare TSP and NID solutions by adding 0.1 to 0.5 ounces of NID to each gallon of water containing 8 to 12 ounces of TSP. NID solutions shall be used at temperatures not greater than 140 F. At temperatures greater than 140 F, the solubility of NID will decrease leading to possible precipitation of NID.

4.4 Cleaning solvents.

4.4.1 NAVSEA approved halogenated solvents.

4.4.1.1 Applicability. A NAVSEA approved halogenated solvent, as specified in appendix E, shall be used as a final cleaner for instruments as specified in 5.4, for liquid oxygen generating plants and plant piping as specified in 5.8, and for field wipe as specified in 5.10.1.1 and 5.12.4. Use of a NAVSEA approved halogenated solvent for any other application requires local engineering, environmental, and industrial hygiene approval.

4.4.1.2 Safety precautions. For any NAVSEA approved halogenated solvent, follow the safety precautions recommended in the vendor's material safety data sheet and the following:

(a) At least two people shall be present at all times while solvent is being used. Do not leave the area unattended while cleaning is in progress.

(b) When a halogenated solvent is being transferred by hose or pipe from a remote location, communication shall be established between the pumping station and the space involved.

(c) To permit escape in the event of an accidental spill, a self-contained breathing device shall be immediately available to each person in any space where operations involving a halogenated solvent are taking place or occupied spaces where leaks may occur while systems containing halogenated solvents are being cleaned, tested, serviced, or repaired. Each person shall have received instruction and practice in the use of the particular self-contained breathing device to be used. When a spill occurs, a high concentration of solvent vapor may rapidly fill the space and dilute the air in the space. Breathing this diluted, contaminated air can result in rapid (10 to 15 seconds) loss of consciousness caused by oxygen being washed from the lungs. It is therefore necessary to stop breathing until the self-contained breathing device has been put on and is supplying air. The Navy "Emergency Escape Breathing Device" (EEBD) may be used for emergency escape.

(d) All hot work in the space shall be suspended before introducing the solvent into the system. An exception is that during overhaul in a shipyard, hot work may be performed on board a ship while systems are being flushed (not pressure tested) with halogenated solvents if each operation is authorized by a gas free engineer.

Personnel shall be instructed to leave the area immediately if anyone experiences any irritation of the eyes, nose, or throat.

During specially authorized hot work, self-contained breathing devices for emergency escape are not required in spaces where all lines being flushed contain only welded joints (no flanges, valves, or other fittings having mechanical joints). The following caution sign shall also be displayed at the entrance to all work spaces:

WARNING

HALOGENATED SOLVENT OPERATION; DO NOT ENTER UNOCCUPIED SPACE

WITHOUT FIRST TESTING FOR SOLVENT; NO HOT WORK OR OPEN FLAMES

ALLOWED IN THIS SPACE EXCEPT WHEN AUTHORIZED BY A GAS FREE

ENGINEER; LEAVE SPACE IMMEDIATELY IF ANYONE NOTICES ANY EYE,

NOSE, OR THROAT IRRITATION.

(e) Carefully check the system for leaks before pumping solvent through the system (see 5.8.3.2).

(f) Chemical safety goggles or a full-length face shield shall be worn where eye contact is possible. A full-length face shield shall be worn over chemical safety goggles for any operation where splashing of the solvent may be a problem. 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 American National Standards Institute (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.

(g) Repeated contact with the skin may cause cracking and irritation.

Wear solvent resistant rubber gloves if contact with the hands cannot otherwise be prevented. Clothing that becomes saturated with solvent should be removed at once.

(h) The atmosphere in the space where the solvent is used shall be continuously monitored. An alarm shall be set on the instrument which will be activated when the solvent reaches its recommended exposure criteria. The concentration of the solvent shall not be allowed to exceed the recommended exposure criteria during a normal working day. If the alarm sounds, immediately put on the EEBD and promptly leave the space. Anyone re-entering the space should wear self-contained breathing apparatus operated in a pressure-demand mode.

(i) An industrial hygienist, gas-free engineer, gas-free person, or other designated individual shall verify that ventilation in the space is adequate to keep the concentration of the solvent below the recommended exposure criteria during anticipated operations, excluding accidents or spills. If necessary use portable blowers.

Exhaust ventilation is preferable to blowing air into the space.

Solvent vapors should be captured as close as possible to the point of generation and discharged outside of the area in a manner that precludes recirculation and exposure to other personnel.

(j) In the event any adverse health effects are experienced, cease operations involving halogenated solvents and consult the cognizant medical department representative for additional guidance. Should someone be overcome in a space which lacks oxygen or because of the presence of a high solvent vapor concentration, the person should be removed immediately and given artificial respiration if necessary.

WARNING

SINCE HALOGENATED SOLVENTS MAY CAUSE CARDIAC SENSITIZATION, THE

ATTENDING PHYSICIAN SHALL NOT ADMINISTER AN INJECTION OF

EPINEPHRINE OR SIMILAR HEART STIMULANT AS CARDIAC ARRHYTHMIA,

INCLUDING VENTRICULAR FIBRILLATION, MAY RESULT. THE PATIENT SHOULD

BE GIVEN FRESH AIR IMMEDIATELY AND SHOULD NOT BE ALLOWED TO EXERT

HIMSELF OR HERSELF.

(k) When drying with nitrogen, solvent vapors and nitrogen shall be externally vented away from populated areas.