DI-HFAC-81977
i. Conclusions.
3.1. The following types of noise surveys shall be identified for all compartments accessible by
a door or hatch, and at all on-deck work stations. The space shall be listed by standard
nomenclature (i.e., level or deck frame compartment number such as 02-28-05).
a. Underway at operating conditions as stated in the specification with machinery and with
equipment in the "normally operating" state, including machinery items that cycle "on
and off" on demand,
b. Dockside while on shore power with only the heating, ventilation, and air conditioning
(HVAC) system functioning in the "normally operating" state,
c. Hazardous conditions survey for the underway "normally operating" state, and
d. Hazardous conditions survey for the dockside "normally operating" state.
3.2. For each of the noise surveys described in 3.1 above, the sound pressure levels (SPL) as
overall dB(A), overall dB(C), peak SPL, un-weighted octave band, and time weighted average
(TWA) (if needed), in units of dB re 20µ Pa shall be provided.
3.3. For each item in 3.1 that exceeds its acoustical requirements, the following shall be
provided:
Diagnostic survey for the underway "normally operating" state.
a.
Diagnostic survey for the dockside "normally operating" state.
b.
c.
Noise excesses due to radiation from vibrating structures such as decks and bulkheads.
d.
Diagnostic octave band or one-third octave band data.
e.
Diagnostic structureborne noise data in units of dB re 1micro-g.
f.
Narrowband data in the frequency ranges of 1 to100 Hz, 100 to 1,000 Hz and 1,000 to
10,000 Hz.
3.4. The noise survey report shall include the underway measured data described in 3.1.a and
3.1.e.
3.5. The noise survey report shall include the dockside measured data described in 3.1.b and
3.1.f.
3.6. The noise survey report shall include a list of any HVAC system that was not balanced
prior to performing the noise surveys described 3.1.
3.7. The noise survey report shall include a list of all fans, fan coil assemblies, fan coil units,
unit heaters, unit coolers, air handling units and other air moving devices with item number and
compartment location.
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