I encourage all of you to become familiar with the recommendations for demonstrations given in Chapter 12 of NFPA 45 Fire Protection for Laboratories Using Chemicals.
Chapter 12 Educational and Instructional
12.1 General. This chapter provides fire protection and safety
requirements for new and existing educational and instructional
laboratories where experiments are conducted or demonstrations
are performed using hazardous materials.
12.2* Instructor Responsibilities. Where instructors are performing
demonstrations or students are conducting experiments
using hazardous materials, the instructor shall be required
to perform a documented hazard risk assessment,
provide a safety briefing to students, provide adequate personal
protective equipment (PPE), and place a safety barrier
(as required) between students and the demonstration or experiment
to prevent personal injury.
12.2.1* Instructors in teaching labs shall be trained and
knowledgeable in fire safety procedures, emergency plans, the how to properly conduct a hazard risk assessment.
12.3 Chemical Storage and Handling.
12.3.1* Bulk quantities of chemicals shall be stored in a locked
room outside of the classroom in educational labs. Chemicals
stored and in use in an educational lab classroom shall be
limited to the amount needed for one day's use, preapportioned
to the amount needed for each class session. The
amount of chemical that is not in use during an individual
class session shall be kept in an appropriate, locked cabinet.
126.96.36.199 Quantities of chemicals in an instructional lab shall
be limited to the lowest possible level necessary and in no case
shall exceed the per-laboratory unit quantities specified in
9.1.1 or the maximum allowable quantities specified in fire or
188.8.131.52 Dispensing of bulk quantities of chemicals for an
experiment or demonstration shall be performed in a prep
room outside of the classroom.
184.108.40.206 For existing educational and instructional laboratories
that do not have a separate preparation room, the dispensing
of bulk quantities of chemicals for experiments or demonstrations
shall be performed prior to the arrival of the students
in the classroom.
220.127.116.11 The minimum amount of chemical(s) needed to perform
the experiment or demonstration shall be transferred to a
small, appropriately labeled, sealable bottle(s) or dropping
18.104.22.168 Bottles of chemicals shall only be open in the classroom
only when the experiment or demonstration is being
12.3.2* Performance of Experiments or Demonstrations.
22.214.171.124 Experiments or demonstrations for students involving
open flames; fire; or the use of flammable, reactive, toxic
or corrosive chemicals shall be performed in accordance with
126.96.36.199.1, and 188.8.131.52.2, 184.108.40.206.3, or 220.127.116.11.4.
18.104.22.168.1 Experiments or demonstrations shall be performed
in a location that does not block access to the primary
means of egress from the laboratory work area.
22.214.171.124.2* Experiments or demonstrations that involve or
produce hazardous quantities of fumes, vapors, particulates,
or gases shall be performed in a chemical fume hood or other
ventilation device adequate to capture the materials being
evolved. This includes demonstration hoods or other devices
that meet the requirements of ANSI/AIHA Z9.5 2.1.1.
126.96.36.199.3 Experiments or demonstrations involving chemicals
that are performed outside a fume hood where the separation
distance in 188.8.131.52.4 is not possible shall be performed behind
an impact-resistant plastic or tempered-glass safety shield.
(1) The shield shall be at least 0.610 m (24 in.) high and shall
wrap 180 degrees around the hazard or extend at least
0.305 m (12 in.) beyond the hazard in both directions.
(2) The shield shall be secured to the work surface with bolts
or clamps to keep it in place.
184.108.40.206.4 Experiments or demonstrations involving chemicals
that are performed outside a fume hood where a shield is not
utilized shall be performed in a location that is at least 3.05 m
(10 ft.) from students.
220.127.116.11 Experiments or demonstrations using flammable
liquids and open flames shall be performed by a knowledgeable
18.104.22.168 In educational and instructional laboratories where
experiments are conducted by students, the instructor shall be
responsible for conducting a safety briefing prior to the start
of each experiment to review the hazards of the chemicals
used, the personal protective equipment required for the experiment,
and a review of the emergency procedures.
12.4 Other Requirements. Educational and instructional
laboratory units shall be classified in accordance with 4.2.2.
12.4.1 Educational laboratory units shall be provided with
fire-rated separation in accordance with 5.1.3.
12.4.2 Life safety classification for educational and instructional
laboratory units shall be in accordance with Section 5.3.
12.4.3 The allowed quantities of flammable and combustible
liquids for educational and instructional laboratory units shall
be in accordance with Section 9.1.
12.4.4 The allowed quantities of compressed gases for educational
and instructional laboratory units shall be in accordance
12.4.5 Emergency gas shutoffs for educational and instructional
laboratory work areas shall be in accordance with
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It saw this too. It made me wonder if the approach we, the ACS, is taking is the correct approach. In addition to teaching the safe way to show the demonstration we need to discover where this teacher learned how to do this demonstration, follow the trail back to get to the source of the demonstration and correct the problem.
Here we go again. Another flammable demonstration gone wrong.
This was reported on ABC National News tonight (Nov 2). It happened in Georgia this week.
Fortunately, the teacher was not seriously injured (minor burns and burned hair) and none of the students were hurt. One very, very lucky teacher!
I guess she was trying to show that flame will follow a vapor or that the vapor had a higher density than air.
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