[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR204.51]

[Page 88-89]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 204--NOISE EMISSION STANDARDS FOR CONSTRUCTION EQUIPMENT--Table of Contents
 
                   Subpart B--Portable Air Compressors
 
Sec. 204.51  Definitions.

    (a) Portable air compressor or compressor means any wheel, skid, 
truck, or railroad car mounted, but not self-propelled, equipment 
designed to activate pneumatic tools. This consists of an air compressor 
(air end), and a reciprocating rotary or turbine engine rigidly 
connected in permanent alignment and mounted on a common frame. Also 
included are all cooling, lubricating, regulating, starting, and fuel 
systems, and all equipment necessary to constitute a complete, self-
contained unit with a rated capacity of 75 cfm or greater which delivers 
air at pressures greater than 50 psig, but does not include any 
pneumatic tools themselves.
    (b) Maximum Rated Capacity means that the portable air compressor, 
operating at the design full speed with the compressor on load, delivers 
its rated cfm output and pressure, as defined by the manufacturer.
    (c) Model year means the manufacturer's annual production period 
which includes January 1 of such calendar year; Provided, that if the 
manufacturer has no annual production period, the term ``model year'' 
shall mean the calendar year.

[[Page 89]]

    (d) Compressor configuration means the basic classification unit of 
a manufacturer's product line and is comprised of compressor lines, 
models or series which are identical in all material respects with 
regard to the parameters listed in Sec. 204.55-3.
    (e) Category means a group of compressor configurations which are 
identical in all aspects with respect to the parameters listed in 
paragraph (c)(1)(i) of Sec. 204.55-2.
    (f) [Reserved]
    (g) Noise emission test means a test conducted pursuant to the 
measurement methodology specified in Sec. 204.54.
    (h) Inspection Criteria means the rejection and acceptance numbers 
associated with a particular sampling plan.
    (i) Acceptable Quality Level (AQL) means the maximum percentage of 
failing compressors that, for purposes of sampling inspection can be 
considered satisfactory as a process average.
    (j) Batch means the collection of compressors of the same category 
or configuration, as designated by the Administrator in a test request, 
from which a batch sample is to be randomly drawn and inspected to 
determine conformance with the acceptability criteria.
    (k) Batch sample means the collection of compressors that are drawn 
from a batch.
    (l) Batch sample size means the number of compressors of the same 
category or configuration which is randomly drawn from the batch sample 
and which will receive emissions tests.
    (m) Test sample means the collection of compressors from the same 
category or configuration which is randomly drawn from the batch sample 
and which will receive emissions tests.
    (n) Batch size means the number, as designated by the Administrator 
in the test request, of compressors of the same category or 
configuration in a batch.
    (o) Test sample size means the number of compressors of the same 
configuration in a test sample.
    (p) Acceptable of a batch means that the number of non-complying 
compressors in the batch sample is less than or equal to the acceptance 
number as determined by the appropriate sampling plan.
    (q) Rejection of a batch means that the number of non-complying 
compressors in the batch sample is greater than or equal to the 
rejection number as determined by the appropriate sampling plan.
    (r) Acceptance of a batch sequence means that the number of rejected 
batches in the sequence is less than or equal to the sequence acceptable 
number as determined by the appropriate sampling plan.
    (s) Rejection of a batch sequence means that the number of rejected 
batches in a sequence is greater than or equal to the sequence rejection 
number as determined by the appropriate sampling plan.
    (t) Shift means the regular production work period for one group of 
workers.
    (u) Failing compressor means that the measured noise emissions of 
the compressor, when measured in accordance with the applicable 
procedure, exceeds the applicable standard.
    (v) Acceptance of a compressor means that the measured noise 
emissions of the compressor, when measured in accordance with the 
applicable procedure, conforms to the applicable standard.
    (w) Test Compressor means a compressor used to demonstrate 
compliance with the applicable noise emissions standard.
    (x) Tampering means those acts prohibited by section 10(a)(2) of the 
Act.

(Secs. 6 and 13, Noise Control Act, Pub. L. 92-574, 86 Stat. 1244; (42 
U.S.C. 4912))

[41 FR 2172, Jan. 14, 1976, as amended at 42 FR 41635, Aug. 18, 1977; 47 
FR 57711, Dec. 28, 1982]