MIL-STD-1622B(SH)
TABLE V. Applicability matrix for flush duration and back flush. 1/
Configuration |
Flush duration 2/ |
Back flush |
System contains socket welds, fittings or components with expansions or contractions |
Not less than 60 minutes |
Not less than an additional 60 minutes |
System contains only bends and elbows and no socket welds, fittings or components with expansions or contractions |
Not less than 30 minutes |
Not required |
Any configuration with all sections of piping fabricated from precleaned piping and components |
Not less than 30 minutes |
Not less than an additional 30 minutes |
1/ Regardless of the configuration, the back flush can be deleted if all of the following conditions are met:
(1)It is authorized by local engineering. (2)All pipe sections have been pre-cleaned.
(3)All valve bodies, filter housings, and other large component housings shall have been cleaned as specified herein.
(4)Prior to the flush, all cartridges, filter elements, regulators, and other components shall be removed and flush plugs or bypass lines installed. After the flush, all cavities shall be visually inspected as specified in 5.14.1. Any evidence of contamination shall be removed by either local cleaning as specified in 5.13.4 or additional flushing. The results of the visual inspection shall be recorded for critical applications.
2/ Shorter durations for general applications can be authorized by local engineering. The durations specified assume a worst case of particulate and heavy grease. Light oils can be removed using shorter durations.
(d)Upon completing the flush of critical applications, obtain a sample of not less than 200 mL of used NOC or 500 to 600 mL of used TSP from each outlet prior to the filter. Sampling prior to the back flush is required only if new cleaning agent will be used for the back flush. If the same charge of cleaner is used for both directions of the flush, only sampling at the end of the flush is required.
(e)Inspect the NOC sample drawn as specified in 5.6.7(d) for organic cleanliness as specified in 5.14.2 and 5.14.3.2. If oil or particulate is present, continue flushing until no oil or
excessive (3 or more particles) particulate is present. Continued flushing will allow the filter to remove the visible contaminants. If foam is present, replace the cleaning solution and repeat the pipe line cleaning process.
(f)Inspect the TSP sample drawn as specified in 5.6.7(d) for organic cleanliness by analyzing for hydrocarbons or NVR as specified in MIL-STD-1330, or an approved EPA Oil and Grease and Total Petroleum Hydrocarbon test method such as EPA Method 1664, or equal. The acceptance criteria is 15 ppm maximum. Do not wait for the results before proceeding to rinsing as specified in
5.6.8. If greater than 15 ppm hydrocarbon or NVR is present, replace the cleaning solution and repeat the pipe line cleaning process.
26
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business