BLOCK 4: CHEMICAL CONTROLS - Unit 7: Ventilation Survey Requirements & Unit 8: Pitot Traverse Surveys (complete) Flashcards
A method of controlling the environment with airflow.
VENTILATION
There are __________ (how many) types of ventilation system surveys BEs will need to perform:
4
PRE-SURVEY
INIATIAL SURVEY
BASELINE SURVEY (with air sampling)
ROUTINE SURVEY
Used to plan a full-scale ventilation survey (initial/baseline measurements and future routine system checks).
PRE-SURVEY
Determines initial acceptance standards (after installation of system). After the system is installed, it should not be accepted and put into service until BE verifies it meets the design criteria.
INITIAL SURVEY
Accomplished after the system has been put into service. The purpose of the survey is to ensure that the system is capable of controlling a hazard below the appropriate OEL and establish baseline parameters for future routine performance tests.
BASELINE SURVEY
Accomplished periodically and measures the same parameters that were measured during the baseline survey.
ROUTINE SURVEY
Measures velocity at face of hood
volumetric flow rate = air velocity x hood face area
Instrument used: Thermoanemometer
FACE VELOCITY
Measures velocity and static pressure
Instrument used: Inclined Manometer
PITOT TRAVERSE
Identify this form and take note of where the Static Pressure and Velocity Pressure are located:
PITOT TRAVERSE METHOD FORM (or Survey Form)
When should an initial survey be done?
Ideally, before a ventilation system is put into operation.
BEs perform the initial survey to evaluate whether or not the key parameters for the system have been met to ± _____ percent of the design criteria.
10
The purpose of air samples during the baseline survey are to see if the system is controlling the contaminant below the established _____.
Occupational Exposure Limit (OEL)
Reference for surveys
Thank you AMN Smith!
M (Manufacture Manual)
V (Ventilation Manual)
P (Pre-Survey Form)
