DI-HFAC-81982
e. The most recent pipe section flexibility and pipe section pipe hanger loading analyses
report(s) for the exhaust system for each internal combustion engine, i.e., diesel and/or
gas turbine, if such exhaust system(s) is required by specification to be resiliently
supported.
f. The most recent arrangement drawing and detail design drawing for each acoustic
treatment, e.g., acoustic enclosure.
3.3. The report shall include, by compartment and by structural area of coverage, the date and a
listing of the personnel performing the inspections.
3.3.1 The report shall identify incorrect or deficient installations, and shall recommend any
proposed corrective actions.
3.3.2 If a treatment is not inspected or not present at the date of inspection, a schedule for
performing and reporting such treatments shall be included.
3.3.3 Photographs shall be included, when applicable, to augment inspection results where it is
helpful in conveying inspection results such as the existence of structural shorts or mounts
installed incorrectly.
3.3.4 The report shall contain a description of all acoustic insulation systems (as well as those
fire and thermal insulations specified as acting as acoustic insulations) and damping systems,
installed in accordance with the ship design drawings and in accordance with the information
included in NAVSEA drawings 804-5773932 and 803-5184182 (if referenced in the ship
specification).
3.3.5 For all acoustic insulation systems, the report shall specifically address:
a.
insulation type,
b.
area of coverage,
c.
facing,
d.
adequacy of insulation pins,
e.
sealing at seams and edges,
f.
protection (sheathing), and
g.
painting, and if the acoustic insulations are external to any other treatments.
3.3.6 The report shall include a description of all damping treatments and shall also specify if
the inspected damping treatments are or are not installed in accordance with the ship design
drawings and in accordance with the information included in MIL-STD-2148, Vibration,
Damping Materials, Procedures for Installation, Maintenance, and Repairs, specifically
addressing type of damping material, thickness of the tile, area of coverage, constraining layer,
adhesion of tiles and constraining layer, and other inspection details required in MIL-STD-2148.
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