Chapter 8, Problem 1RQ

The low-pressure side of the system must not be pressurized to more than
A. 75 psig.
B. 200 psig.
C. the low-side design pressure.
D. atmospheric pressure.

To determine

The maximum pressure up to which the low pressure side of the system can be pressurized.

Answer to Problem 1RQ

The maximum pressure up to which the low pressure side of the system can be pressurized $200\text{psig}$.

Explanation of Solution

The pressure used to pressurize a system must not exceed the lowest pressure for the system. The system which is being subjected to pressurization must be allowed to stand still for a time period of at least 10 minutes. This will allow for the equalization of the pressure in the system. After the equalization of the pressure, it is important to mark the high pressure gauge after tapping the gauge to settle down the needle.

The low pressure side of the refrigeration system has a normal working pressure of $150\text{psig}$.

The low pressure side of the refrigeration system includes evaporator, compressor and the suction line. The compressor head and the outlet or the discharge head are taken to be on the high pressure side of the system. The test pressure in the high pressure side of the refrigeration system for a majority of the refrigerants is minimum $350\text{psig}$.

Conclusion:

The maximum pressure up to which the low pressure side of the system can be pressurized $200\text{psig}$.