Final answer:
The question pertains to maximum pressure limits for plastic gas pipes, with 100 psig for natural gas. For LP-gas, the maximum pressure is often higher, and while the question omits the exact value, it might typically be around 125 psig. Calculations for pressure due to a column of oil must take hydrostatic principles into account.
Step-by-step explanation:
The subject question relates to the use of plastic gas pipes and the pressure limitations for natural gas and LP-gas (liquefied petroleum gas) systems. In the context of gas piping, the limit is set to prevent too much pressure from leading to a hazardous situation or the failure of the plastic pipe material. For natural gas, the maximum allowable pressure within plastic pipes is usually capped at 100 pounds per square inch gauge (psig). The question, however, omits the maximum pressure for LP-gas, which is typically higher than that for natural gas due to the different properties and requirements of LP-gas systems. While the precise pressure limit can vary based on codes and regulations, an example threshold might be 125 psig for LP-gas. To calculate the added pressure from a column of oil or other fluids in the pipe, you would use the principle of hydrostatic pressure: Pressure due to a fluid column = density of fluid × gravity × height of the column. This calculation must be factored into the total pressure acting on the pipe to ensure it does not exceed the designated pressure limits for safe operation.