Homework 6

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8.15. "Laboratory Safety":‘ The procedure in a chemistry laboratory experiment called for the students to prepare a 1.0 dm' aqueous solution of 30 g of sodium hydroxide. By mistake, the student used 30 g of sodium hydride dispersion, which reacted violently with water, evolving heat and hydrogen gas, which caught fire. The sodium hydride, which was available for a subsequent experiment, was a commer- cial product. The container bore a warning of the hazard of contact with water, but this warning was not visible from the side showing the name of the compound.

Carry out a potential problem analysis that, if followed, would have prevented this accident.

Adapted from ICE Prevention Bulletin, December 1991, 102, p. 7.

8.16. "Safety in the Plant": A reactor approximately 6 feet in diameter and 20 feet high in an ammonia plant had to be shut down to repair a malfunctioning nozzle. The nozzle could be repaired only by having a welder climb inside the reactor to carry out the repair. During welding, the oxygen concentration was regularly monitored. Four hours after the welding was completed, a technician entered the reactor to take pictures of the weld. The next day he was found dead in the reactor.

Prepare a potential problem analysis table that could have prevented this accident. Adapted fromlCEPrevention Bulletin, December 1991, 102, p. 27.

8.17. "New Chicken Sandwich": Burgermeister has been serving fast-food hamburgers for more than 20 years. To keep pace with the changing times and tastes, Burger- meister has been experimenting with new products in order to attract potential customers. Product development has recently designed a new Cajun chicken sand- wich to be called Ragin' Cajun Chicken. The developers have spent almost nine months perfecting the recipe for this new product.

One of the developers got the idea for a new product while in New Orleans during last year's Mardi Gras. Product Development has suggested that the sandwich be placed on Burgermeister's menu immediately, in order to coincide with this year's Mardi Gras festivities. A majority of the time spent developing the Ragin' Cajun Chicken sandwich was dedicated to producing an acceptable sauce. Every recipe was tasted by the developers, who found early recipes for sauces to be too spicy. Finally, they agreed on the seventy-eighth recipe for sauce (Formula 78) as the best choice.

After converging on a sauce, the Development team focused on preparation aspects of the new sandwich. Several tests confirmed that the existing equipment in Burger- meister restaurants could not be used to prepare Ragin' Cajun Chicken. Instead, a new broiler would have to be installed in each of the 11000 Burgermeister restau- rants, at a cost of over $3000 per unit. The new broiler would keep the chicken moist while cooking it, as well as killing any salmonella, the bacteria prevalent in chicken.

salmonella. Tests aetermtnea mat the source of the bacteria was a set of tongs mar

the developer used to handle both the raw and the cooked chicken.

Next, the Development team decided how the sandwich would be prepared. When

the Ragin' Cajun Chicken sandwich was prepared using buns currently used for

other Burgermeister sandwiches, the sandwich received a very low taste rating.

After experimenting, researchers found that a Kaiser roll best complemented the

sandwich. Early cost estimates showed that Kaiser rolls will cost twice as much as

the buns used currently for hamburgers, and are fresh half as long.

You are an executive in charge of product development for Burgermeister. Based on

the information above, perform a potential problem analysis, considering what

could go wrong with the introduction of this new sandwich.

Developed in collaboration with Mike Szachta, University of Michigan, 1992.

8.18. Carry out a KTPPA for each of the following situations:

A. A surprise birthday party.

B. A camping trip in the mountains.

C. The transportation of a giraffe from the Detroit Zoo to the Los Angeles Zoo.

D. An upcoming laboratory experiment.

E. The transport of nuclear waste from the reactor to the disposal site.