1、IMETRIC I . DOD-STD-2187(SH) 20 August 1987 SUPERSEDING MIL,-C-l8159A(SHIPS) 14 August 1963 Ei IL I TARY S TAND AD CHEMICAL CLEANING OF SALT WATER PIPING SYSTEMS (METRIC) msc N/A FSC 4710 DISTRIBUTION STATENENT A Approved for public release; distribution unlimited a . THIS DOCUMENT CONTAINS /A PAGES
2、. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2187 47 a 799771L 00683b7 4 a DOD-STD-2187(SH) 20 August 1987 DEPARTMENT OF THE NAVY NAVAL SEA SYSTEMS COMMAND I Washington, DC 20362-5101 Chemical Cleaning of Salt Water Piping Systems (Metri
3、c) 1. This Military 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. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use
4、in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. b ii Provi
5、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- DOD-STD-2187 97 97777LL b8368 b - . - _- DOD-STD-2187(SH) 20 August 1987 FOREWORD This Military Standard provides instruction for the removal of deposits, scale and marine growth from salt water piping syst
6、ems such as the firemain and flushing piping systems. iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2187 i.17 m 777771L 00b83b7 m Paragraph 1 . 1.1 2 . 2.1 2.1.1 2.2 3 . 4 . 5 . 5.1 5.1.1 5.1.2 5.2 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.4
7、5.5 5.5.1 5.5.2 5.5.3 5.5.4 5.5.5 5; 5.6 5.5.7 5.5.8 5.5.9 5.5.10 5.5.11 5.5.13 5.5.14 5.5.12 5.5.15 5.6 5.6.1 5.6.2 DOD-STD-2187(SH) 20 August 1987 CONTENTS Page SCOPE . 1 General 1 REFERENCED DOCUMENTS 1 Government documents . 1 Specifications . 1 Order of precedence 1 GENERAL REQUIREMENTS 1 DETAI
8、LED REQUIREMENTS . 1 Chemical agents 1 Acid solution 2 Neutralizing solution 2 Utilities 2 Equipment 2 Equipment assembly . 2 Composition of equipment . 3 Equipment grounding 3 Integrity of assembly 3 Explosion-proof motor 3 Operators 3 Procedures and operations 3 General 3 Piping system preparation
9、 4 Preparation of equipment . 4 Hot operational check of piping system . 4 Acid fill 4 Soaking period . 5 Temperature readings . 5 Depletion of solvent strength 5 Draining the spent acid 5 5 5 Neutralizing the piping system . 5 Final flush 5 Hydrostatic tests for ships and submarines . 6 Inspection
10、of submarine piping . 6 Safety precautions . 6 Coordination with safety superintendent 6 Posting of warning signs . 6 Disposal of spent solutions Flushing the piping system . iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L - DOD-STD-ZL7 47 m 797
11、97LL 00b370 4 m DOD-STD-2187(SH) 20 August 1987 CONTENTS - Continued Page Paragraph 5.6.3 Use of non-sparking tools 6 5.6.4 Neutralizing spills 6 5.6.5 Flushing hoses . 6 6. NOTES . 7 6.1 Intended use . 7 6.2 Subject term (key word) listing 7 . I v/vi Provided by IHSNot for ResaleNo reproduction or
12、networking permitted without license from IHS-,-,-DOD-STD-2187(SH) 20 August 1987 1. SCOPE 1.1 General. This military standard covers the general requirements governing the chemical agents, mobile treating equipment and procedure for the removal of deposits, scale and marine growth from salt water p
13、iping systems such as the firemain and flushing piping systems. by Navy-approved private contractors or naval shipyards. This standard is intended for use 2. REFERENCED DOCUMENTS 2.1 Government documents. 2.1.1 Specifications. Unless otherwise specified, the following speci- fications of the issue l
14、isted in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this standard to the extent specified herein. SPECIFICATIONS FEDERAL O-H-7 65 - Hydrochloric Acid, Technical. O-S-5 7 1 - Sodium Carbonate, Anhydrous, Technica
15、l. MILITARY MIL-D-16791 - Detergents, General Purpose (Liquid, Nonionic). MIL-1-17433 - Inhibitor, Hydrochloric Acid Descaling and Pickling Solutions. (Copies of specifications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity
16、or as directed by the contracting officer.) 2.2 Order of precedence. In the event of a conflict between the text of this standard and the references cited herein, the text of this standard shall take precedence. 3. DEFINLTIONS Not applicable. 4. GENERAL REQUIREMENTS Not applicable. 5. DETAILED REQUI
17、REMENTS 5.1 Chemical agents. Chemical agents shall be as specified in 5.1.1 and 5.1.2. 1 t Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2187 47 W 77777L1 0068372 I- DOD-STD-2 187 ( SH) 20 August 1987 5.1.1 Acid solution. The acid chemical
18、cleaning solution shall have the compositions as specified below. chemical cleaning solution that may be blended in an acid mixing tank or by means of a proportioning header. arrival on the job site. Only fresh water shall be used to prepare the The solution shall not be blended before (a) Hydrochlo
19、ric acid (HCl), 20 degrees - 10.0 + 1.0 percent of HCl Baume in accordance with 0-H-765 by wight (b) Corrosion inhibitor - concentration as specified in accordance with MIL-1-17433 by manufacturer (c) Detergent in accordance with type I of MIL-D-16791 - 0.1 percent by weight 5.1.2 Neutralizing solut
20、ion. The neutralizing solution shall contain 4 ounces of sodium carbonate, anhydrous, technical (soda ash) conforming to 0-S-571 per gallon of fresh water required to fill the system. 5.2 Utilities. Utilities shall consist of the following: (a) (b) Saturated steam at 690 kilopascals (kPa) (100 pound
21、s per square (c) (d) A source of electrical power. A supply of fresh water for making dilutions and for flushing. inch (lb/in2). A source of compressed air at 621 to 690 kPa (90 to 100 lb/in2). 5.3 Equipment. The equipment shall be as specified in 5.3.1 through 5.3.5. 5.3.1 Equipment assembly. The a
22、cid solvent shall be in a mobile tank. The assembly of the mobile equipment shall be such as to provide utmost safety to operating personnel. The following equipment shall be a part of the assembly: One acid tank. One acid pump. One proportioning header or its equivalent for dilution of One steam he
23、ater assembly for heating solutions. Acid resistant hose for admitting solutions to piping system. Assorted hoses for venting air and water supply. Steam hose. One chemical testing kit for checking acid concentration of solutions. Pressure, temperature and flow regulators. One explosimeter. One port
24、able pyrometer. One in-line thermometer to measure the temperature of solutions concentrated solutions. during filling and recirculation. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I- ,- - DOD-STD-2187(SH) 20 August 1987 (m) (n) (o) (p) Assort
25、ed nonsparking tools including hammers, wrenches and Safety clothing to be worn by operating crew and other safety Equipment needed for disposal of spent solutions. Strainers for submarine flushing as specified in flushing screwdrivers. provisions, as required (see 5.6). diagram. 5.3.2 Composition o
26、f equipment. The proportioning header, steam heater assembly and fittings, and valves that contact the acid solution shall consist of mild steel. 5.3.3 Equipment grounding. Provisions shall be available for elimination of stray electrical charges and accumulated electrostatic charges on equipment. 5
27、.3.4 Integrity of assembly. When the unit is completely assembled to Pump seal and valve stems shall be tightened or replaced as necessary deliver solutions to a piping system, no leaks shall be evident at connecting points. to avoid creating hazardous conditions in the working area. 5.3.5 Explosion
28、-proof motor. The acid pump shall be driven by an explosion- proof motor. 5.4 Operators. A minimum of two qualified operators shall oversee and perform duties related to the cleaning operation. present during the entire cleaning operation beginning with pumping of the acid solvent into the piping sy
29、stem and ending with completion of the final freshwater flush. Two operators shall be 5.5 Procedures and operations. The procedures and operations shall be as specified in 5.5.1 through 5.5.15. 5.5, General. Chemical cleaning of saltwater piping systems shall be accomplished in the six following maj
30、or steps. added at the discretion of the activity concerned.) (Supplementary steps may be (a) (b) Segregation, clean, freshwater flushing and leakage testing of Filling the piping system with heated acid solvent folloved by the piping system. soaking and circulation of the acid while maintaining the
31、 temperature. (c) (d) Draining of the acid solvent. Flushing of the piping.syctem with clean, fresh water to remove remaining acid as well as loosened deposits that were not completely dissolved. (e) Neutralizing with alkaline solution. (f) Final freshwater flush to remove remaining alkali. 3 Provid
32、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2187(CH) 20 August 1987 5.5.2 Piping system preparation. The piping system preparation shall be as specified below: (a) For ships. The piping system shall be given a thorough examina- tion and clean,
33、freshwater flushing before chemical cleaning. Apply a hydrostatic test at 135 percent of the working pressure to the piping system in the cleaning configuration and inspect carefully for the presence of leaks. Valves and fittings shall be checked for tightness and any leakage found shall be repaired
34、. The piping system shall be isolated from all connected machinery items and other systems including heat exchangers to which it may be connected. Control devices and instruments shall be blanked off or removed. The piping system (particularly the firemain system) should be divided into separate sec
35、tions by the removal of valves, waster spools, gaskets, O-rings, and other fittings. The sections shall be fitted with blanks having hose connectors. before cleaning to be certain that no section of piping is left connected into the system which cannot be completely neutralized and flushed with fres
36、h water after application of the acid. (b) For submarines. The piping systems shall be flushed as specifi- cally defined by approved flushing diagrams and procedures established for each submarine. show details for bypassing components, details for blanking of piping such as gauges and instrument li
37、nes, and shall indicate required flow rates. The system shall be carefully inspected The flushing diagram shall 5.5.3 Preparation of equipment. Fill and return lines shall be connected to the treating equipment and the piping system. The highest point in the piping system shall be selected for makin
38、g the return connection as the return line also serves as the vent. 5.5.4 Hot operational check of piping system. The piping system shall be heated to 82 + 5 degrees Celsius (OC) (180 + 10 degrees Fahrenheit (OF) by heating and cxrculating hot fresh water. water temperature shall not be permitted to
39、 rise at a rate greater than 5OC (lOF) per minute. of the piping system and verify that no obstructions to flow exist. During circulation of the heated water, carefully check the piping and treating system, including valves and fittings for the presence of leaks. Any leakage found shall be repaired.
40、 before beginning the acid fill. Dring preheating, the circulating Circulate heated water through all anticipated flow paths The piping and treating system shall be drained immediately 5.5.5 Acid fill. The piping system shall be filled with the chemical cleaning solution specified in 5.1.1 at a temp
41、erature of 60 + 5OC (140 + 10F) as determined by an in-line thermometer. acid shall be circulated for 15 minutes. After the piping system is filled, the 4 F Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2187(SH) 20 August 1987 5.5.6 Soaking
42、 period. Following the initial circulation, the acid solvent shall be allowed to soak for a total of 6 hours. The acid shall be recirculated for 15 minutes during each hour of acid exposure. During the recirculation, the acid shall be heated to 60 + 5C (140 + 10F) using the steam heater assembly as
43、needed, determining the temperature by The in-line thermometer. 5.5.7 Temperature readings. Using the portable pyrometer, hourly temper- ature readings shall be taken at various points on the pipe in the system and logged. 5.5.8 Depletion of solvent strength. Samples of the acid solvent shall be obt
44、ained hourly during the recirculation periods and tested for acid concen- tration. The results shall be logged. Additional samples shall be obtained at the same times and labeled with the time of sampling. be reserved for use by the activity concerned. These samples shall 5.5.9 Draining the spent ac
45、id. Spent acid shall be removed from the piping system through drains provided for this purpose at the lowest points in the system. pressure not exceeding 207 kPa (30 lb/in2). be used if any uncontrollable leaks developed during the soaking period. If leaks develop when the system is under air or ni
46、trogen pressure, immediately secure the pressure source and vent the system to reduce pressure to atmospheric pressure. The solution shall be displaced by pumping or by air or nitrogen Air or nitrogen pressure shall not 5.5.10 Disposal of spent solutions. The spent acid as well as the other spent so
47、lutions resulting from the cleaning operation shall be disposed of in accordance with local regulations. contractors responsibility. Disposal of spent solutions shall be the O 5.5.11 Flushing the piping system. The piping system shall be given a minimum of two flushes with clean, fresh water at temp
48、eratures of 60 2 5C (140 + 10F). flushing. The effluent pH shall be greater than 4 upon completion of 5.5.12 Neutralizing the piping system. The neutralizing solution specified in 5.1.2 shall be prepared in the contractors equipment. shall be filled with the neutralizing solution at a temperature of
49、 54 + 5OC (130 f 10F). After the piping system is filled, the neutralizing solution shall be recirculated for 15 minutes. to soak for 30 minutes, after which it shall be drained in the same manner as the spent acid (see 5.5.9). tained throughout the entire process. The piping system The neutralizing solution shall then be allowed The 54 2 5C (130 - + 10F) tempe
