BLOCK 4: CHEMICAL CONTROLS - Unit 10: Ventilation Follow-Up (complete) Flashcards
The velocity of air across the plane of an inlet or outlet to the system. They are typically taken at the face of a hood, but may be taken at the discharge end of a system as well.
FACE VELOCITY
TRUE OR FALSE:
Measuring velocities is a way to determine the volume of air flowing through a ventilation system. This volume can be used to determine if a contaminant is transported through the vent at the appropriate flow rate.
TRUE
The data and resulting calculations from this technique are used to then make health risk assessments.
To perform a survey, we use a _______________.
THERMOANENOMETER
Additionally, we use the following materials:
* Ventilation survey form – This is where we record the measurements
* Calculator – A calculator is needed to calculate area and volumetric flow rate
* Measuring Tape or Ruler – We must measure the face dimensions to calculate the
face area
We determine the key parameters of a ventilation system by referencing the _______________, _______________, or the _______________. (MVP)
MANUFACTURE GUIDANCE
VENTILATION MANUAL (TEXTBOOK BY ACGIH)
PRE-SURVEY FORM
During a _______________ survey, we conduct air sampling at the same time that we take measurements of the ventilation system, which allows us to confirm the system was adequately controlling hazards below the OEL at the time of the survey.
BASELINE SURVEY
Once the baseline survey is complete, the ventilation system is placed on a _______________ survey schedule.
ROUTINE SURVEY
If measuring airflow, such as volumetric flow rate (Q) or face velocity (v), then the acceptable
range is +/- _____% of the baseline measurement.
10%
This range defines what is acceptable to record during a routine survey performed on a routine schedule.
If measuring static pressure (SP), the acceptable range is +/- 20% of the baseline measurement.
_______________ is the process we follow to determine the cause of a problem.
TROUBLESHOOTING
This is NOT a “fix” for the problem, but rather it’s assessment.
Once troubleshooting has been accomplished, a _______________ needs to be submitted to facility managers or Civil Engineering to correct the problem.
WORK ORDER
This is the “fix” for the problem.
It is the ____________________ responsibility to ensure the system receives the maintenance or repairs it needs in order to protect their workers.
WORKPLACE SUPERVISOR’S
RESPONSIBILITIES
Surveys all ventilation systems that are controlling a hazard.
BIOENVIRONMENTAL ENGINEERING
RESPONSIBILITIES
Perform routine maintenance and troubleshooting on ventilation systems.
CIVIL ENGINEERING
RESPONSIBILITIES
Contact BE prior to any ventilation system being put into use. Reports HVAC deficiencies to CE
WORKPLACE SUPERVISOR
RESPONSIBILITIES
Use ventilation system properly and report any issues to shop supervisor.
WORKER
