When is the risk of tank failure due to brittle fracture considered minimal?

When is the risk of tank failure due to brittle fracture considered minimal?

• A. The tank has demonstrated its ability to withstand combined effects of maximum liquid level and the highest operating temperature
• B. The tank has demonstrated its ability to withstand combined effects of intermediate liquid level and the lowest operating temperature
• C. The tank has demonstrated its ability to withstand combined effects of maximum liquid level and lowest operating temperature
• D. The tank has demonstrated its ability to withstand combined effects of maximum liquid level and intermediate operating temperature

Answer: (C)

The situation where the risk of tank failure due to brittle fracture is considered minimal is when the tank has demonstrated its ability to withstand the combined effects of maximum liquid level and the lowest operating temperature. At maximum liquid levels, tanks are typically tested to ensure they can handle the highest stresses they will encounter during operation. Operating at the lowest temperature decreases the risk of brittle fracture because most materials, particularly metals used in storage tanks, exhibit improved ductility and toughness at lower temperatures. This combination means that even under significant stress due to the maximum liquid level, the tank material is less likely to become brittle and fail. It's important to understand the influence of temperature on material properties. As temperatures rise, certain materials can become more susceptible to brittleness, especially if they have previously been stressed to their limits. Therefore, maintaining the lowest operating temperature while at maximum liquid capacity reduces the overall risk of brittleness leading to a fracture. This principle is crucial in ensuring the integrity and safety of aboveground storage tanks.

The situation where the risk of tank failure due to brittle fracture is considered minimal is when the tank has demonstrated its ability to withstand the combined effects of maximum liquid level and the lowest operating temperature.

At maximum liquid levels, tanks are typically tested to ensure they can handle the highest stresses they will encounter during operation. Operating at the lowest temperature decreases the risk of brittle fracture because most materials, particularly metals used in storage tanks, exhibit improved ductility and toughness at lower temperatures. This combination means that even under significant stress due to the maximum liquid level, the tank material is less likely to become brittle and fail.

It's important to understand the influence of temperature on material properties. As temperatures rise, certain materials can become more susceptible to brittleness, especially if they have previously been stressed to their limits. Therefore, maintaining the lowest operating temperature while at maximum liquid capacity reduces the overall risk of brittleness leading to a fracture. This principle is crucial in ensuring the integrity and safety of aboveground storage tanks.