Table I—Sample Size Code Letters

Open Table
Batch size Code letter
4 to 8 A.
9 to 15 B.
16 to 25 C.
26 and larger D.

Table II—Sampling Plans for Inspecting Batches

Open Table
Sample size code letter Test sample Test sample size Cumulative test sample size Batch inspection criteria
Acceptance number Rejection number
A 1st 4 4 0 1
B 1st 3 3 0 1
C 1st 3 3 0 2
    2d 3 6 1 2
D 1st 2 2 (1) 2
    2d 2 4 (1) 2
    3d 2 6 0 2
    4th 2 8 0 3
    5th 2 10 1 3
    6th 2 12 1 3
    7th 2 14 2 3

1Batch acceptance not permitted at this sample size.

Table III—Batch Sequence Plans

Open Table
Sample size code letter Number batches Cumulative number batches Sequence inspection criteria
Acceptance number Rejection number
A 2 2 1 (1)
    2 4 2 4
    2 6 3 5
    2 8 4 5
B 2 2 0 (1)
    2 4 1 4
    2 6 2 5
    2 8 3 5
    2 10 4 6
    2 12 5 6
C 2 2 (2) 2
    2 4 0 2
    2 6 0 3
    2 8 1 3
    2 10 2 4
    2 12 3 4
D 2 2 0 2
    2 4 1 3
    2 6 2 4
    2 8 3 4

1Batch sequence rejection not permitted for this number of batches.

2Batch sequence acceptance not permitted for this number of batches.

Table IV—Recommended Format for Portable Air Compressor Noise Data Sheet

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Test report number:
Subject:
Manufacturer: Model: Serial No.:
Rated speed: Rpm: Rated capacity: cfm (m3/in).
Configuration identification: Category identification:
Portable air compressor identification No.: Build date:
Test conditions:
Manufacturer's test site identification and location:
Reflecting plane composition:
Operating speed as tested:
Beginning of test rpm
End of test rpm
Air pressure supplied: psi (kg/cm2) Ambient wind speed___mph (km/hr)
Actual flow rate: cfm (m3/min.) Atmospheric pressure___psi (kg/cm2)
Temperature: °F (°C)
Instrumentation:
Microphone Manufacturer: Model No.: Serial No.:
Sound Level Meter Manufacturer: Model No.: Serial No.:
Calibrator Manufacturer: Model No.: Serial No.:
Other and Manufacturer: Model No.: Serial No.:
Data:
Open Table
Sound levels (decibels) Background sound level at location 1 (decibels) Location
1 2 3 4 5 Average sound level (decibels)
A-Weighted
Tested by: Date:
Reported by: Date:
Supervisory personnel: Title:
                    Title:

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