• ASTM D3631-99(2011)

ASTM D3631-99(2011)

Standard Test Methods for Measuring Surface Atmospheric Pressure

ASTM International, 10/01/2011

Publisher: ASTM

File Format: PDF

$30.00$60.00


Published:01/10/2011

Pages:5

File Size:1 file , 92 KB

Note:This product is unavailable in Russia, Ukraine, Belarus

1.1 These methods cover the measurement of atmospheric pressure with two types of barometers: the Fortin-type mercurial barometer and the aneroid barometer.

1.2 In the absence of abnormal perturbations, atmospheric pressure measured by these methods at a point is valid everywhere within a horizontal distance of 100 m and a vertical distance of 0.5 m of the point.

1.3 Atmospheric pressure decreases with increasing height and varies with horizontal distance by 1 Pa/100 m or less except in the event of catastrophic phenomena (for example, tornadoes). Therefore, extension of a known barometric pressure to another site beyond the spatial limits stated in 1.2 can be accomplished by correction for height difference if the following criteria are met:

1.3.1 The new site is within 2000 m laterally and 500 m vertically.

1.3.2 The change of pressure during the previous 10 min has been less than 20 Pa.

The pressure, P2 at Site 2 is a function of the known pressure P1 at Site 1, the algebraic difference in height above sea level, h1 h 2, and the average absolute temperature in the space between. The functional relationship between P1 and P2 is shown in 10.2. The difference between P1 and P2 for each 1 m of difference between h1 and h2 is given in Table 1 and 10.4 for selected values of P1 and average temperature.

1.4 Atmospheric pressure varies with time. These methods provide instantaneous values only.

1.5 The values stated in SI units are to be regarded as the standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific safety precautionary statements are given in Section 7.

TABLE 1 Selected Values

Average
Tempera-
ture,
Pressure P1, Pa
110 000 100 000 90 000 80 000 70 000
Correction to P1, Pa/m, positive if h1 > h, negative if h1 < h2
230 16 15 13 12 10
240 16 14 13 11 10
250 15 14 12 11 10
260 14 13 12 11 9
270 14 13 11 10 9
280 13 12 11 10 9
290 13 12 11 9 8
300 13 11 10 9 8
310 12 11 10 9 8

More ASTM standard pdf

ASTM C1461-08(2013)

ASTM C1461-08(2013)

Standard Specification for Mechanical Couplings Using Thermoplastic Elastomeric (TPE) Gaskets for Joining Drain, Waste, and Vent (DWV), Sewer, Sanitary, and Storm Plumbing Systems for Above and Below Ground Use

$26.00 $52.00

ASTM C1189-11

ASTM C1189-11

Standard Guide to Procedures for Calibrating Automatic Pedestrian SNM Monitors

$30.00 $60.00

ASTM A291/A291M-18a

ASTM A291/A291M-18a

Standard Specification for Steel Forgings, Carbon and Alloy, for Pinions, Gears and Shafts for Reduction Gears

$30.00 $60.00

ASTM D4312-20

ASTM D4312-20

Standard Test Method for Toluene-Insoluble (TI) Content of Tar and Pitch (Short Method)

$22.00 $44.00