&led by
MALCOLM M. RENFREW University of ldaho MOSCOW, Idaho 83843
Designing a Safe Academic Chemistry Building Frank L. Chlad and John J. Houser The University of Akron, Akron, OH 44325
As previously reported (J. CHEM. EDUC., Vol. 55. o. 36. Januarv 1978).the Deoartment ut ('hrmislint ' l ' h e ~ n i v r k i l yof ~ k n m has m t w d intu a new farility thst is hernldedas one u i the satait academic rhemistrv huildings ever constructed. The Knight Chemical Laboratory has received a great deal of attention nationally. Over ninetv, inauiries have been received . a m ? the t'mt article appeared drscr:binl: the mnnv iunlqur a d innuv,itiw features. Represrnrnti\rs from Ari/unaStale. Uutre I h w .
Frank L. Chlad is the administrative officer for the department of Chemistry a t T h e University of Akron. He serves on his department and campus safety committees and has been a key person in the design of chemical laboratory facilities for three separate science buildings. He is a consultant in the area of Laboratorv Desien and Safetv and is
paper on safety in Laboratory Design a t the 1978 National Safety Concress . in Chicago. He also serves as Executive Viceoresident of the National Safetv Town Center, a "on-profit organization which promotes a program of preschool safety education. J o h n J. Houser is associate Profersor of('h~mirtryat The I'niversify uf Akrun. Hr isa inemher d both rhc rlr~~nrrmrnraland campus rnfety committees and has more than twenty years experience in both academic and government laboratories. In addition to teaching laboratory courses he gives two laboratory safety lectures a t The University of Akron a t the beginning of each school year, one to the departmental teaching assistants and one to all new science and engineering graduate students. He presented a paper on the design of a safe academic chemistry building a t the National ACS meeting in September 1978.
West Virginia, and Cleveland State have already viewed the building to study the safety features.
Preliminary Planning
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In retrosoeet.. it was fortunate that the department had 11, wn,t until thr I Y W a fora n n i tulding hecause uf two rercnt phcnmnenn. h s r , thr rstablirhmenr d g c w m ~~
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stitutions as weil as in industrial operations has raised the soectre of substantial fines for practices that have long h r m rommonplnre In university chemistry rlq,nrrmenta ircmdly, thew hns dwrloprd uvcr the Inst 111teen years or so a far greater willingness on the part of students and their parents to sue universities, faculty members, and graduate assistants in eases of injury suffered in chemistry laboratories. Recognizing that these pressures could only increase in the future, and being more aware ourselves of some ofthe insidiouslong-term effectsof low levels of chemicals in the working place, the department and the university administration resolved to make safety the main consideration in the design of the new facility.
General Building Design The University of Akron is a state university and is held to the space requirement standards of the state Board of Regents when i t submits requests for new buildings. These standards tie allotted space, and hence funds, to the projected enrollment ten years hence. Based on a projected enrollment increase of six-percentper year, the University of Akron in 1975 was allotted $6.00 million for a new chemistry building having approximately 72,000 sq. ft. Subsequently, it was decided to combine this facility with a proposed health sciences building, and the State approved the Present 140,660sq. ft., 59.75 million building consisting of a four-story chemistry wing, containing over 80,000 sq. ft., and a threestory health sciences wing. A major eonsideration in the design of any safe chemistry building is the ventilation and exhaust system, and it is here that a conflict
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between safety and energy conservation was encountered. In response to the energy crisis, Ohio now requires the designers of all new buildings constructed with state funds t o explain in detail how the ~ r o p o s e dstructure will consume considerably less energy than comparable existing buildings. The 160-hood exhaust system envisioned for our new facility would have removed from the building enormous quantities of heated or air-conditioned air, imposing an intolerable energy burden on the university. The problem was circumvented by using induced-air hoods in all locations except for the introductory chemistry laboratory, the "clean room" and a few laboratories in which canopy hoods are used for temporary storage of chemicals. These hoods, manufactured by the Taylar Equipment Co. of Taylor, Texas, use 75% outside air (tempered in the winter t o 60'F) and 25% room air. An automatic baffle arrangement within the hood acts to maintain this 75/25 ratio with a 100-150 cfm face veloelty regardless of the position of the hood door. A manual interior baffle allows the operator to exhaust more efficiently vapors either heavier or lighter than air. The outside air is drawn in through ducts in the base of the building, filtered and blown down the outside face of the hood door. In the event
permit access to the lock. All laboratory aisles are a minimum of five feet in width to allow rapid escape. The main entrance to all offices and laboratories is from a central hall running the length of the building and having stairwells a t either end. In faculty officellaboratories and graduate research laboratories, the office areas are adjacent to the hall so that students arriving for conferences with their instructors need not enter a laboratory, and a graduate student studying in his or her office area cannot be trapped by a sudden fire in the laboratory. Electrical supply, water, gas, and drain lines are contained in chases which run vertically between floors on either side of the hall. Outside each laboratory there is a locked access panel in the chase. The key t o the aecess panel is kept in the laboratory. In an emergency any utilities to a single laboratory may be shut off from this chase. Of course, the building isequipped with the usual array of smoke and heat detectors and fire alarms.
that the door is completely closed, the outside air is directed down the inside face of the door, while a row of holes in the front of the hood below the door serves to maintain a t least some room-to-hood air flow. The exhaust ducts from all hoods or hood groupings below the fourth floor run horizontally to the e!osest outside wall and into a chase running the entire height of the building. The building has eleven such chases. On the roof each duct is connected to a separate fan. Hoods on the fourth floor are exhausted vertically to the roof. The hood system is so arranged that the hoads ineach room of each floor are exhausted through separate ducts t o eliminate suck-back of vapors, a not uncommon problem in buildings having several hood ducts in common. Complementing the induced-air hoods, the heating, ventilating and air-conditioning system is capable of moving air through the building a t approximately three times the usual rate, ensuring that even a slightly volatile chemical spilled on a floor outside of a hood cannot build up dangerous levels of vapor over a period of time. This is particularly important where mercury is in use. The layout of rooms and laboratories and of work areas within laboratories was intended to prevent anyone from being trapped by fire, smoke, or chemical fumes. There are a t least two doors to every room which chemical work could be carried out. In cases where for security reasons a rear door is kept locked, that door is fitted with a window which in an emergency can be broken to
Design of Specific Areas
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The oaraaraohs which fallow will describe the par&& safety features found in certain areas of the building. Introductory Chemistry. There are eight introductory chemistry laboratories arranged in four blocks of two, the two being separated by pocket doors. A laboratory has 24 student stations, each one with a bench-top "T"haod. The haod has an adjustable baffle to allow far removal of vaoors heavier or liehter than air.
hoads are exhausted as a group through a common duct; the storage hood is exhausted separately.
these laboratories, and the students do all experiments in eight-foot indueed-air hoads, two students to a hood. The haads are exhausted in erouos of two. There are several
undergraduate organic laboratory should be essentially eliminated. Spillage on the labaratory floor is reduced since the hood floors have an approximately one-inch lip. The danger of fire is lessened greatly, both because burners will be replaced by heating mantles, and because solvent vapors cannot accumulate. The hood doors, when pulled down, provide each student with a safety shield. Should a fire break out, it is easily confined to a small area and readily extinguished. Finally, to most students, a hood is a place to store malodorous or hazardous chemicals. It is hoped that forcing students to work in hoads will accustom them to the
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A six-foot canopy hood mounted over a bench is situated against one mall. This bench is used to store general solvents and any chemicals needed for a particular experiment. A custom-made seven-foot sloped stane drain board and sink is used t o store aqueous inorganic acids, bases, etc. An ordinary kitchen sink sprayer is provided for flushing spills away. At either end of each laboratory are tahles for melting point apparatuses, rotary evaporators, and other small equipment. The evaporators are intended to overcome the student's natural tendency to bail off solvents into the air-a practice considered undesirable even in a hood. The twoorganic laboratories are separated by an instrument room which houses an nmr, two ir spectrometers and two gas chromatographs. Due to the large number of hoods in the two undergraduate organic laboratories, a tremendous amount of outside air is brought in to maintain the 75/25 ratio that is exhausted. As an example, rooms of this size without the hoads would normally require 4 4 air changes per hour, while under the system designed for us, the undergraduate organic laboratories receive 109 air changes per hour or one every 33 seconds. Graduate Research. The graduate research laboratories are 24' X 30' and are designed for occupancy for four students. I t was felt that having a series of two-student laboratories would result in a needless duplication of equipment, while placing mare than four people in a single room would lead to overcrowding. Our experience with hood usage in the old chemistry building was that most experiments were carried out on bench tops because the hoads were used mostly for chemical storage. This practice had the further disadvantage that it required the hoods to beleft on continuously. Our solution to this in the new building was to place fiue four-foot hoods in each four-student laboratory. Four of the hoods, exhausted together, are used for conducting experiments and have the entire complement of utilities. They are turned on only when actually in use. The fifth hood contains no utilities, but rather it is fitted with shelves and is used only for storage of chemicals. This hood is exhausted separately and is left on continuously. In addition, each research laboratory contains a 45-gallon safety cabinet for storage of solvents. This airtight steel cabinet meets OSHA standards and is designed to suffocate a fire, should one start within it, and i t is designed to contain spills from leaking bottles. All teaching and research laboratories are provided with a eolor-coded "safety island," a highly visible, easily accessible area in which are located the emergency water sprayer, one or more COz extinguishers, a hucket of sand, and a wall-mounted fire blanket. Dry powder extinguishers were avoided because of the destructive effect of the airborne powder on electronic instruments. Faculty OffieelLaboratories. The 12' X 30' faculty officellaboratories are divided into a 10' x 12' office separated from a 20' X 12' laboratory by a door. The rear door of the laboratory section typically opens into an adjacent graduate research laboratory. The faculty member is provided with a four-foot induced-air hood hut is expected t o use the chemical storage hood and solvent safety cabinet in the graduate laboratory.
"Clean Room." The "clean room" was included in the building in response t o the published OSHA regulations for the handling of carcinogenic and otherwise highly toxic materials in industrial laboratories. Our expectation is that these regulations will in the future be extended to academic institutions. The walls of this 12' X 30' room are coved floor and ceiling and are covered with sheet vinyl a s is the floor. The suspended ceiling uses replaceable gypsum hoard panels. For ease of decontamination, the laboratory workbench and sink are constructed of stainless steel as are a glove box and a hood. This radiological-grade hood is not of the induced-air type and is not even exhausted t o the outside. Rather it is exhausted hack into the room through a series of replaceable filters. In the front of this room is a tiled shower and dressing room. The "clean room" is located directly across the hall from the undergraduate organic laboratories, making it very convenient for any student who has been badly splashed with a chemical to shower immediately and get a change of clothing. The privacy of this roam should eliminate any reluctance on the part of the student to wash thoroughly enough to avoid serious injury. It must beemphasized that the "clean room" is for use with toxic materials only, not explosive ones. A "high pressure" laboratory having steel walls is available in the science and engineering building for this purpose. Chemical Stores. The chemistry department has the responsibility of providing chemicals and chemical eouioment to the
entire campus. This necessitates storage and handling of much larger amounts of these items than would normally be required for a department of thissize. In the new building, the chemical stares operation is contained in a one-story wing located in the middle of the first floor near the elevator and adjacent to a loading dock. The wing is landscaped on the three exposed sides with an earthen hank which extends t o within three feet of the eleven-foot roof line. The roof itself is equipped with ventilation fans and pressure-releasing plastic hlow-out panels. Inside, the area is divided into a receiving room, a waste-solvent holding roam, and three sepsrate storage rooms for dry chemicals, liquid chemicals, and equipment, including glassware. Within the chemical storaee rooms.
any of the storage areas, the smoke and heat detectors will trigger a C o n extinguisher system located in the ceiling and supplied from cylinders stored in the receiving room. A t the same time, an annunciator system located in the chemical stores office will sound an alarm, and by means of a lighted panel will show the location of the fire. To reduce still further the fire danger, all phones, switches, receptacles, and light fixtures in the chemical stores are static free. The wastesolvent stored in the holding room iscontained in five-gallon polyethylene containers and is picked u p weekly by a private chemical disposal service. (Continued on paxe A280)
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These safety solvent cans with flame arresting openings and spring-loaded caps are placed in every laboratory in the building. Enoueh extra safetv cans were purchased so that a"ful1 can mav be reolaced immediatel~ Waste solid chemicals in properly labeled containers are also picked up for disposal in a landfill
Safety Training for Personnel While the safety designed into a building is vitally important, in the final analysis people will be the determining factor as to the overall safety of the building. They have the potential within themselves to either prevent or cause an accident. Chemical safety involves much more than sophisticated exhaust systems, careful design and layout of laboratories, and the many facets of structural detail that makes our huilding unique. We need to teach people how to be safe. Let us therefore examine how this department deals with the matter of safety training and programs affecting people.
Supervisory Training. Prior t o the start of each fall semester, our department safety committee holds a mandatory safety seminar for all new teaching assistants. The subject areas included in the seminar consist of instruction in the use of all safety equipment (fire extinguishers, self-contained breathing apparatuses, fire blankets, safety showers, etc.) emergency procedures to he followed in the event of an accident or fire, and a careful explanation of department policy regarding protective eyewear and safety rules to be followed in all laboratories. In addition, a yearly program is sponsored by our department for the entire university, a t which lahoratory assistants from other science departments are given a more generalized seminar in lahoratory safety. For this program we bring in outside speakers and cover areas such as the use of high pressure gases, care and delivery of liquid gases, safe handling of acids and flammable solvents, and general laboratory safety. In addition to the lahoratory teaching assistants, all storeroom personnel are also required to attend these safety seminars. Undergraduate Safety Instruction. The utmost care has been exercised in designing undergraduate laboratory experiments. In introductory chemistry each student works under a "T" type, bench-mounted hoodand receivesspeeifiesafety instruction before every lahoratory period during a fifteen-minute pre-lah lecture. This lecture is videotaped and is viewed through television receivers which are located in each of the
laboratories. Each experiment is carefully explained and heavy emphasis is placed on proper set-up and use of equipment and safe technique. At the first laboratory meeting of the semester, each student is given two copies of the safety rules to he followed in the laboratory. The student signs one copy attesting to the fact he or she has read, understands, and will follow them and turns it in to the lab instructor who keeps it on file. The other copy remains with the student. In the undergraduate organic laboratory each student does all his work in a hood. (Two student stations per eight-foot hood.) Because of the type of chemicals and solvents utilized, great care has been taken t o carefully select, and "scale down" the experiments for this lab. Students utilize ground glass kits in the semi-micro range (19122)for their work. As an additional safety feature, the lab is almost completely flameless, because steam baths and heating mantles are normally used as heat sources. Safety Inspections. Safety inspections of all laboratories, both instructional and research, are an integral part of our total safety program. Beginning this year, as a part of their educational process, we have involved the Akron Chapter of the A.C.S. student affiliates who will assist the department safety committee by making safety inspections of all the labs. They will work from a carefully designed safety checklist and will note all deficiencies. It is felt that this will make them more aware of safetv oractices and influence them later in their own laboratory work. Accident Reports. Accident reports, if designed properly, can provide a wealth of information far your safety program. These accident reports should be viewed as a means of "fact" findine, and not "fault" finding. Our department requires that an accident reoort be filed with thesafetvcommittee for every inc~dent,no matter how minor. These reports are reviewed and determinations can then be made as to where problem areas exist and what steps can be taken to prevent their recurrence.
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Summary and Conclusion It is our view that colleges and universities must start making a serious commitment to safety. . . to be willing to expend the time, enerev. e "", and monev ,reouired to ~ r o v i d their faculty, staff and students with a safe environment in which to teach and to learn. Designing safety into the construction of laboratory facilities is vitally important, but it is only the first step of many which are needed in order to make a total safety program functional. Also needed are written policies and support from supervisory and too administration officials. a conscientious program of inspections and enforcement, and perhaps most vital of all, the realization on the part of all personnel that safety is an attitude. a frame of mind that must be with us each and every moment. Then, and only then, can we be sure that we have done our jobs.
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