Difference between revisions of "Heat Stress"
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=== Methods === | === Methods === | ||
| − | Refer to the [[OSHA Technical Manual (OTM)]], [https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_4.html#4 Section III, Chapter 4, Sub-section IV], for heat stress sampling methods. | + | Refer to the [[OSHA Technical Manual (OTM)]], [https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_4.html#4 Section III, Chapter 4, Sub-section IV], for heat stress sampling methods. Here are some key points: |
| + | * The wick of the '''natural wet bulb thermometer''' should be kept wet with distilled water for '''at least one-half hour''' before the temperature reading is made. It is not enough to immerse the other end of the wick into a reservoir of distilled water and wait until the whole wick becomes wet by capillarity. The wick must be '''wetted by direct application''' of water from a syringe one-half hour before each reading. | ||
| + | * The wick should always be clean, and new wicks should be washed before using. | ||
| + | * The globe thermometer should be exposed '''at least 25 minutes''' before it is read. | ||
| + | * A stand should be used [. . .] so that [. . .] the wet-bulb and globe thermometer are not shaded. | ||
| + | |||
| + | * '''Wet Bulb Globe Temperature Indexes (WBGI)''': Here is some information on how the different temperature indices are calculated. This will help to understand the differences between the various readings on the heat monitor: | ||
| + | ** Indoor or outdoors with no solar load: ''WBGT'' = 0.7''NWB'' + 0.3''GT'' | ||
| + | ** Outdoors with solar load: ''WBGT'' = 0.7''NWB'' + 0.2''GT'' + 0.1''DB'' | ||
| + | ** where: | ||
| + | *** WBGT = Wet Bulb Globe Temperature Index | ||
| + | *** NWB = Natural Wet-Bulb Temperature | ||
| + | *** DB = Dry-Bulb (air) Temperature | ||
| + | *** GT = Globe Thermometer Temperature | ||
=== Substance Codes === | === Substance Codes === | ||
| + | [''Honestly, I'm not sure which of these we need to enter on the sampling sheets. I have yet to find anything in IMIS or a CPL that indicate which IMIS codes to use. -kbh''] | ||
| + | |||
'''8320''' Heat Stress - Dry | '''8320''' Heat Stress - Dry | ||
* Do not use anything involving the Wet Bulb (WB) | * Do not use anything involving the Wet Bulb (WB) | ||
'''8330''' Heat Stress | '''8330''' Heat Stress | ||
| + | * The IMIS description indicates that this is for '''''inside''''' heat monitoring. Therefore, use the WBGT<sub>i</sub> value. [???] | ||
| + | '''8891''' Humidity, Relative | ||
| − | + | Unless told otherwise, enter all of these values into the sampling forms and into OSHA Express. Additionally, after yours truly contacted a former KYOSH CSHO who now works with federal OSHA in Ohio, this was basically how the feds in his region do it — the "shotgun approach." | |
== Equipment == | == Equipment == | ||
| − | ''NEEDS INFORMATION ON QUESTEMP | + | ''NEEDS INFORMATION ON QUESTEMP 34'' |
| + | [https://s3oshkynet.s3.amazonaws.com/OSH%20Reference/Equipment/Pump%20&%20Meter%20Docs/Questemp-34-36-Heat-Stress-Monitor-Manual.pdf QuesTemp 34 Manual] | ||
[[Category:Health]] | [[Category:Health]] | ||
Latest revision as of 17:05, 23 October 2018
Standards
There is no specific standard that applies to heat stress. The only citation option is a General Duty, 5(a)(1).
Sampling
Methods
Refer to the OSHA Technical Manual (OTM), Section III, Chapter 4, Sub-section IV, for heat stress sampling methods. Here are some key points:
- The wick of the natural wet bulb thermometer should be kept wet with distilled water for at least one-half hour before the temperature reading is made. It is not enough to immerse the other end of the wick into a reservoir of distilled water and wait until the whole wick becomes wet by capillarity. The wick must be wetted by direct application of water from a syringe one-half hour before each reading.
- The wick should always be clean, and new wicks should be washed before using.
- The globe thermometer should be exposed at least 25 minutes before it is read.
- A stand should be used [. . .] so that [. . .] the wet-bulb and globe thermometer are not shaded.
- Wet Bulb Globe Temperature Indexes (WBGI): Here is some information on how the different temperature indices are calculated. This will help to understand the differences between the various readings on the heat monitor:
- Indoor or outdoors with no solar load: WBGT = 0.7NWB + 0.3GT
- Outdoors with solar load: WBGT = 0.7NWB + 0.2GT + 0.1DB
- where:
- WBGT = Wet Bulb Globe Temperature Index
- NWB = Natural Wet-Bulb Temperature
- DB = Dry-Bulb (air) Temperature
- GT = Globe Thermometer Temperature
Substance Codes
[Honestly, I'm not sure which of these we need to enter on the sampling sheets. I have yet to find anything in IMIS or a CPL that indicate which IMIS codes to use. -kbh]
8320 Heat Stress - Dry
- Do not use anything involving the Wet Bulb (WB)
8330 Heat Stress
- The IMIS description indicates that this is for inside heat monitoring. Therefore, use the WBGTi value. [???]
8891 Humidity, Relative
Unless told otherwise, enter all of these values into the sampling forms and into OSHA Express. Additionally, after yours truly contacted a former KYOSH CSHO who now works with federal OSHA in Ohio, this was basically how the feds in his region do it — the "shotgun approach."
Equipment
NEEDS INFORMATION ON QUESTEMP 34
