Minimum continuous service temperature

TABLE 28-34 Minimum Temperature without Excessive Scaling in Air (Continuous Service) ... 

For V-helt drive, the type of helt section and maximum number of belts may be specified, as well as the minimum number —usually 3. B-sections are most common. V-belts are not considered for drives over about 50-60 hp, and a minimum service factor of 1.4 should be specified for continuous duty. Belts should not be used in any conditions where the surrounding temperature is greater than 160°F, with or without fens operating. This is of particular importance in induced draft conditions where belts might be in the exit air stream. 

The most important factor in gas turbine maintenance is the type of fuel burned. Natural gas is the cleanest fuel and incurs minimum maintenance costs and downtime. It is common for gas turbines in base-load industrial service to operate at full load on maximum-exhaust-temperature control continuously for 3 yr. Not many industrial plants or processes can operate for such long periods hence, gas turbines are generally maintained at shorter intervals during process outages. 

---