Q1: Which of the following is termed as the boiler mounting ?

ANS:C - Blow off cock

A blow-off cock is an essential component of a boiler system, specifically considered as one of the boiler mountings. It serves an important function in maintaining the efficiency, safety, and reliability of the boiler. Here's a detailed explanation of the blow-off cock:

1. Location and Purpose: The blow-off cock is typically located at the lowest point of the boiler shell or at the bottom of the boiler drum. Its primary purpose is to provide a means for draining out water, sediment, and impurities that accumulate at the bottom of the boiler over time. These impurities can include dissolved solids, sludge, and other contaminants that may settle during the boiler's operation.
2. Prevention of Sediment Buildup: During the operation of the boiler, water is continuously heated to produce steam. As water is heated, dissolved solids present in the water may precipitate and settle at the bottom of the boiler. Additionally, impurities carried by the feed water or formed as a result of chemical reactions may also accumulate over time. If these impurities are not removed, they can lead to scale formation, corrosion, and reduced efficiency of the boiler. The blow-off cock allows for periodic draining of the accumulated sediment, preventing scale buildup and maintaining optimal boiler performance.
3. Safety Considerations: In addition to maintaining boiler efficiency, the blow-off cock also serves important safety functions. By periodically draining water and impurities from the boiler, the blow-off cock helps prevent the formation of localized hot spots or overheating that could lead to boiler damage or even catastrophic failure. It also helps ensure the safe operation of the boiler by preventing excessive pressure buildup within the system.
4. Operation: The blow-off cock is typically operated manually, although some modern boiler systems may feature automatic blow-off systems. During operation, the blow-off cock is opened to allow water and impurities to be discharged from the boiler. This process is usually performed when the boiler is offline or under reduced load conditions to minimize disruptions to steam production.
5. Maintenance: Proper maintenance of the blow-off cock is essential to ensure its continued effectiveness and reliability. Regular inspection and cleaning of the blow-off cock, as well as periodic testing of its operation, are recommended to prevent clogging or malfunction. Any signs of leakage or damage should be promptly addressed to prevent steam losses and maintain boiler integrity.

In summary, the blow-off cock plays a critical role in the safe and efficient operation of a boiler system by allowing for the removal of water, sediment, and impurities that accumulate within the boiler. Its function is vital for preventing scale buildup, maintaining boiler efficiency, and ensuring the safety of the boiler and its surroundings.