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ASTM G222-21

(Practice)

Standard Practice for Estimation of UV Irradiance Received by Field-Exposed Products as a Function of Location

Standard Practice for Estimation of UV Irradiance Received by Field-Exposed Products as a Function of Location

SIGNIFICANCE AND USE
5.1 Products exposed outdoors degrade due to primarily three stress factors: sunlight, temperature and moisture. The rate of property change is a function of time and stressors’ intensity.  
5.2 Whereas the UV irradiance calculated in this practice is independent of material, it is especially relevant to polymeric materials exposed outdoors as the combined action of UV radiation and oxygen is often the dominant factor leading to their degradation. Therefore, estimating UV irradiance is an important parameter to assess the service life of products.  
5.3 UV radiant dosage is often more important to determine in the correlation with the amount of degradation than total solar radiant dosage or duration of time. The comparison of UV radiant dosage from one location to another may be used to normalize degradation results.  
5.4 Measured UV irradiance data are scarce compared to total solar irradiance data. Many locations that monitor solar resource data only collect data for total solar radiation. This practice allows the user to estimate the amount of UV irradiance from the amount of total solar irradiance for any site.
SCOPE
1.1 This practice describes methods to estimate the total solar ultraviolet irradiance on a horizontal surface as a function of Air Mass and geographic location.  
1.2 This practice provides a mathematical model for calculating Global Horizontal Ultraviolet irradiance (GHUV) from Global Horizontal Irradiance (GHI) data for a specific location.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-May-2021
ICS
17.240 - Radiation measurements
27.160 - Solar energy engineering
Technical Committee
G03 - Weathering and Durability
Drafting Committee
G03.09 - Radiometry
Current Stage
Ref Project

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ASTM G222-21 - Standard Practice for Estimation of UV Irradiance Received by Field-Exposed Products as a Function of LocationASTM G222-21 - Standard Practice for Estimation of UV Irradiance Received by Field-Exposed Products as a Function of Location
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ASTM G222-21 - Standard Practice for Estimation of UV Irradiance Received by Field-Exposed Products as a Function of Location
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G222 − 21
Standard Practice for
Estimation of UV Irradiance Received by Field-Exposed
1
Products as a Function of Location
This standard is issued under the fixed designation G222; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope butions: Hemispherical on 37° Tilted Surface
G183Practice for Field Use of Pyranometers, Pyrheliom-
1.1 This practice describes methods to estimate the total
eters and UV Radiometers
solarultravioletirradianceonahorizontalsurfaceasafunction
3
2.2 ISO Standards:
of Air Mass and geographic location.
ISO/TR 17801Standard Table for Reference Global Solar
1.2 This practice provides a mathematical model for calcu-
Spectral Irradiance at Sea Level — Horizontal, Relative
lating Global Horizontal Ultraviolet irradiance (GHUV) from
Air Mass 1
GlobalHorizontalIrradiance(GHI)dataforaspecificlocation.
ISO 9060:2018Solar Energy — Specification and Classifi-
1.3 Units—The values stated in SI units are to be regarded
cation of Instruments for Measuring Hemispherical Solar
asstandard.Nootherunitsofmeasurementareincludedinthis
and Direct Solar Radiation
standard.
3. Terminology
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Definitions:
responsibility of the user of this standard to establish appro-
3.1.1 Definitions applicable to this practice can be found in
priate safety, health, and environmental practices and deter-
Terminologies E772 and G113.
mine the applicability of regulatory limitations prior to use.
3.2 Definitions of Terms Specific to This Standard:
-2
1.5 This international standard was developed in accor-
3.2.1 Diffuse Horizontal Irradiance (DHI), W·m ,n—the
dance with internationally recognized principles on standard-
total solar irradiance received on a horizontal plane that has
ization established in the Decision on Principles for the
been scattered or diffused by the atmosphere.
-2
Development of International Standards, Guides and Recom-
3.2.2 Direct Normal Irradiance (DNI), W·m ,n—the total
mendations issued by the World Trade Organization Technical
solar irradiance received on a plane normal to the sun within a
Barriers to Trade (TBT) Committee.
5° concentric field of view around the sun.
-2
3.2.3 Global Horizontal Irradiance (GHI), W·m ,n—the
2. Referenced Documents
total solar irradiance received on a horizontal plane measured
2
2.1 ASTM Standards:
directly using a pyranometer with a hemispherical view, or
D7869PracticeforXenonArcExposureTestwithEnhanced
calculated as the sum of Direct Normal Irradiance (DNI) and
Light and Water Exposure for Transportation Coatings
DiffuseHorizontalIrradiance(DHI)eachmeasuredormodeled
E772Terminology of Solar Energy Conversion
independently:
G113Terminology Relating to Natural andArtificial Weath-
GHI = DHI + DNI * cos (θ ) where θ is the solar zenith angle.
z z
ering Tests of Nonmetallic Materials
3.2.3.1 Discussion—The wavelength range reported for
G173TablesforReferenceSolarSpectralIrradiances:Direct
fieldmeasurementsofGHIvarieswiththepyranometerdesign
Normal and Hemispherical on 37° Tilted Surface
and application. Commercial pyranometers generally measure
G177Tables for Reference Solar Ultraviolet Spectral Distri-
over the 300–3000 nm range, from near the solar cut-on and
cut-off (see ISO 9060). This is sufficient for weathering and
1 durability testing applications because 95% of the solar
ThispracticeisunderthejurisdictionofASTMCommitteeG03onWeathering
and Durability and is the direct responsibility of Subcommittee G03.09 on
irradiance on a surface is from wavelengths < 1800 nm.
Radiometry.
Standardreferencespectrafordifferentapplicationsvaryinthe
Current edition approved June 1, 2021. Published July 2021. DOI: 10.1520/
G0222-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
the ASTM website. Switzerland, https://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G222 − 21
wavelength range they report. For example, ISO 17801 reports
...

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4.1 Using the procedures and apparatus in Sections 8 and 9 and the manufacturer's instructions, pressure-tight joints as strong as the pipe itself can be made between manufacturer-recommended combinations of pipe and fittings. See Specification F1055 for performance requirements of polyethylene electrofusion fittings.
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SCOPE
1.1 This guide establishes the means and frequency of monitoring the neutron exposure of the LWR reactor pressure vessel throughout its operating life.  
1.2 The physics-dosimetry relationships determined from this guide may be used to estimate reactor pressure vessel damage through the application of Practice E693 and Guide E900, using fast neutron fluence (E > 1.0 MeV and E > 0.1 MeV), displacements per atom (dpa), or damage-function-correlated exposure parameters as independent exposure variables. Supporting the application of these standards are the E853, E944, E1005, and E1018 standards, identified in 2.1.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    12 pages
    English language
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  • Guide
    12 pages
    English language
    sale 15% off