What installation precaution should be taken with a bellows thermostatic trap?

The correct answer emphasizes the importance of proper draining when installing a bellows thermostatic trap. This type of trap is designed to manage condensate efficiently to avoid water hammer and maintain the efficiency of the steam system. When equipment is shut down, it's crucial that any accumulated condensate can drain effectively. If the trap is positioned incorrectly, it may lead to condensate pooling, which can result in damage or decreased efficiency due to improper functioning. Therefore, ensuring that it is mounted to facilitate proper drainage is essential for optimal performance and longevity of the steam system.

While there are advantages to considering how the trap is mounted, such as whether it is horizontal or vertical, the primary concern here lies in drainage capability. Other factors like insulation thickness and installation height above equipment also have their absolute merits, but they do not directly address the most critical function of the trap, which is to drain condensate efficiently when the system is not in operation. Hence, mounting to allow proper drainage is the most vital precaution to ensure that the system operates smoothly and effectively.