MIL-STD-419E
4.9 Capping. Openings shall be capped and sealed air tight immediately after the cleaning process with a cap or plug in accordance with NAS 847 (see 5.7). The openings shall remain capped until immediately before connecting to the equipment for which the pipe is intended.
4.10 Heat treated piping and tubing. Pipe or tubing that has had heat applied at the site of installation to assist in forming shall be returned to the shop or other areas where facilities exist for recleaning, repickling (if necessary), and retesting.
5. DETAILED REQUIREMENTS
5.1 Safety precautions. The contractor or shipyard representative shall ensure that this cleaning is coordinated through the safety superintendent to provide adequate personnel protection from acid and chemical hazards. In general, all chemicals involved are harmful to the eyes and skin. Personal contact with chemicals should be avoided. Obtain medical attention immediately if acid or caustic gets in the eyes. Face shields or goggles shall be worn by personnel involved in chemical cleaning. Avoid breathing mists or vapors over mixing tanks. Protective equipment, including personal protective equipment (PPE) for eyes, face, head, and extremities, protective clothing, respiratory devices, and protective shields and barriers, shall be required for personnel who are mixing caustic or acidic cleaning solutions.
5.2 Cleaning. The cleaning and treatment compounds described herein are environmental pollutants if discharged to the water and may be toxic to fresh water and marine organisms. Disposal procedures specified in 5.9 shall be followed. Pickling is not required to clean existing installations during repair or modification unless the pipe or tube has internal oxide scale that cannot be removed by wire brush, water jet, or flushing. If new piping sections have been installed, only the new pipe or tube installed requires pickling. New piping sections do not require pickling if already pickled as specified herein prior to delivery and a clean condition has been maintained during construction. Heat discoloration of piping interior due to welding is not cause for pickling. The following procedure shall be followed in preparation for pickling:
a. If surfaces are coated with oil or preservatives, the component shall be immersed in the degreasing solution both before and after brushing and air blasting.
b. Wire-brush entire surface, including interior. Boiler tube brushes or commercial pipe-cleaning apparatus may be used.
c. Blast thoroughly with air below 30 pounds per square inch (lb/in2) to remove loose particles. Effective chip guarding and personal protective equipment shall be used during air blasting operations.
d. Remove grease, oil, and shop dirt by immersing the work in sufficient quantity of the following solution at
160±10 °F for 15 minutes or longer, depending upon the degree of contamination:
(1) Trisodium phosphate monohydrate (in accordance with O-S-642) - 7 to 10 ounces.
(2) Detergent, nonionic (polyethylene-glycol monoalkylaryl ether) (in accordance with MIL-D-16791, Type I) - 1 fluid ounce.
(3) Water - 1 gallon.
e. Rinse thoroughly in warm water (at least 120 °F).
f. If cleaned pipe, tubing, and fittings are not pickled immediately, dry with warm, dry, oil-free air which has been filtered through at least 15-micrometer absolute rated filters (hereafter referred to only as clean air), and protect from dust, dirt, oil and moisture.
5.2.1 Compressed air cleaning plugs. The use of commercially available pipe cleaning plugs or "pigs" that are close fitting to the inside diameter of the pipe and driven by compressed air for mechanical removal of contaminants in corrosion resistant pipe assembly is acceptable, provided that the pipe assembly contains no dead legs, branches, or reductions in area. Accountability shall be provided for any plugs that were used to ensure that they are not left behind in the pipe assembly.
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business