Final answer:
The exact lock-up pressure for a water column propane system must be determined by the system's design and safety regulations. Specific details, such as material constraints and safety factors, are crucial in defining this value.
Step-by-step explanation:
The maximum allowable lock-up pressure for any water column propane system is not explicitly mentioned in the provided references. The lock-up pressure would be specific to the system's design, material constraints, and safety regulations. However, it's possible to infer based on the provided example regarding a gas cylinder with a safety factor of 2, where it is mentioned that the cylinder can withstand up to 400 atmospheres of pressure before failing. Although this number is for a metal cylinder and not a water column system, it demonstrates that the exact lock-up pressure must be determined according to the specifications and safety requirements of each individual system. In the context of a water column, hydrostatic pressure-related calculations would also be relevant. In industrial settings, safety factors and material strength limits determine the maximum allowable pressures, and these consider temperature variances as described by Gay-Lussac's Law, which states that pressure of a gas is directly proportional to its absolute temperature when volume remains constant.