MIL-STD-1330-SUP-2 Precision Cleaning and Testing of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, and Hydrogen SystemsThis 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. Each activity will 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 will obtain procedure approval from the applicable certifying activity.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67 - 68 - 69 - 70 - 71 - 72 - 73 - 74 - 75 - 76 - 77 - 78 - 79 - 80 - 81 - 82

MIL-STD-1330D(SH)

20 September 1996

(b)        Outlets should be opened one at a time to help clean valve bodies and other probable pocketing areas.  The flush should continue until there is no visible evidence of debris.

5.5.7  Hydrostatic test.  Hydrostatic testing as specified in 5.9 should normally be accomplished after the preflush, if applicable, and before the final flush.

5.5.8  Final flush or pipe line cleaning.  The final flush or pipe line cleaning shall be accomplished as follows:

(a)        Flush the system with NOC at 150 to 170EF or TSP at 160 to 180EF at the flow rate as specified in 5.5.8(b).  The temperature of the NOC at the outlet of the system being cleaned shall be maintained at not less than 140EF.  If TSP is used, the system shall be preheated by flushing once-through with hot grade B water until the desired temperature is attained.  In order to prevent precipitation of the TSP, the TSP shall not be allowed to cool or remain uncirculated prior to rinsing as specified in 5.5.9.  If NOC is used, it may be recirculated in the system cold and heated in place.  The flush starts when the outlet temperature reaches

140EF.

(b)  The fluid velocity shall be not less than 3 ft/sec.  The flow rate

in gallons per minute (GPM) equivalent to 3 ft/sec can be

determined by multiplying the square of the pipe or tube inside

diameter in inches by 7.4, as follows:

GPM at 3 ft/sec = (ID-inches)2(7.4)

(c)        The requirements for a back flush and the flush durations for various applications are as specified in 5.5.8(a) and table III.

(d)        At the completion of the flush, obtain a 500 to 600 mL sample of the flushing medium in a 1-liter container 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)        For NOC, visually inspect the sample for oil and particulate.  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 no oil or excessive particulate is present, verify organic cleanliness as specified in 5.13.2.

(f)  For TSP, verify organic cleanliness as specified in 5.13.2.

(g)  If any analysis fails, replace the cleaning solution and repeat the

final system flush.  Do not wait for the results of 5.13.2 before

proceeding to rinsing as specified in 5.5.9.

TABLE III.  Applicability matrix for flush duration and back flush. 1/

1/ Regardless of the configuration, the back flush can be deleted if all of the following conditions are met:

26