MIL-STD-419E
5.3.2 Ferrous pipe, tubing, and fittings (other than corrosion-resistant steel). The pickling procedure shall be as follows (see 5.3):
a. Pickle free from rust and scale in a hot solution (150±10 °F) of the following composition:
(1) Sulfuric acid, 66 degrees Baume, sp. gr. 1.83 conforming to Type I, Class 1 of A-A-55828 - 7 to 14 fluid ounces.
(2) Sulfuric acid pickling inhibitor - Quantity recommended by manufacturer. (3) Water - 1 gallon.
5.3.2.1 Treatment following pickling. The treatment following pickling shall be as follows:
a. Rinse immediately after pickling in a clean, warm water (over 120 °F) bath.
b. Immerse for several minutes in an alkaline bath containing 4 ounces (per gallon of water) of sodium carbonate conforming to A-A-59563.
c. Rinse by immersing in a clean, warm water (over 120 °F) bath.
d. Immerse in a corrosion inhibitor bath according to manufacturer's recommendations.
e. If the hydrostatic test is to be performed with hydraulic fluid (see 5.3.2.2), rinse the work with clean water, then dry with clean air.
5.3.2.2 Hydrostatic test prior to installation. The piping assembly shall be subjected to the specified test pressure using a hydraulic fluid equal to, or compatible with, that normally used in the system. If leaks occur, they shall be repaired and the assembly treated and retested as specified herein. Following a satisfactory test, the fluid shall be drained and all openings capped. If a water solution has been used, the assembly shall be blown dry with clean dry air before openings are capped. The piping assembly shall then be installed up to the components (see
4.3).
5.3.3 Corrosion-resistant steel pipe, tubing, and fittings. The pickling operation shall be as follows (see 5.3):
a. Immerse work for 10 to 15 minutes in a hot solution (130±10 °F) of the following composition: (1) Nitric acid (in accordance with A-A-59105) - 13 to 20 fluid ounces.
(2) Hydrofluoric acid (60 percent) (in accordance with O-H-795) - 1 to 2 fluid ounces. (3) Water - 1 gallon.
b. Rinse in a clean, warm water (over 120 °F) bath.
c. If hydrostatic test will not be performed with water (see 5.3.1.4), dry the piping assembly with clean air.
5.3.3.1 Hydrostatic test prior to installation. The piping assembly shall be subjected to the test specified in
5.3.1.4.
5.4 Flush of installed system for removal of brazing fluxes. The entire piping system, after installation up to, but not including, the components shall be flushed to remove brazing fluxes. Flushing blocks and other jumpers shall be used to connect piping around components not being flushed. Before filling the system with water, a low pressure air test (up to 100 lb/in2) shall be applied to the piping to check for leaks. Any one of the three following procedures shall be conducted. (The hot flush and hot circulation methods are preferred.)
a. Hot flush soak with nonrecirculating fresh water for 1 hour while ensuring that the temperature at any part of the system does not go below 110 °F.
b. As an alternative to the hot flush procedure, a hot recirculating procedure with fresh water may be conducted for a period of 1 hour for systems where such an arrangement is feasible. The system temperature shall be monitored so that no part of the system falls below 110 °F. Following the recirculating procedure, the system shall be flushed with fresh water for 15 minutes at a minimum temperature of 60 °F.
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