They are occasionally exposed to hazardous chemicals, fumes, gases, and dusts. Engineers may experience back strain from lifting heavy objects or crawling inside boilers. Machinery is often operated 24 hours a day, seven days a week, so shift work is common. Some engineers work weekends and holidays. Most work 40 hours a week.
Some engineers work alone, while others work in small crews.
Some are members of a union. Wages vary with level of training, experience and location. Entry level wages may be lower. Pay varies with the type of employer and the experience of the worker. Full-time stationary engineers generally receive benefits such as health insurance, paid vacation, and sick leave.