Question

The blow-back Ring should be adjusted so the blow back on a safety valve up to 100 pounds will not be less than:

a) 2 pounds
b) 4 pounds
c) 6 pounds
d) 10 pounds

Answer 1

The blow-back ring on a safety valve set for up to 100 psi should be adjusted to ensure a minimum blow-back of 4 pounds to maintain the proper function and safety of the valve. (option 2 is the correct answer).

Step-by-step explanation:

The blow-back ring on a safety valve is a critical component for controlling the pressure at which the valve reseats after discharging, to prevent simmering or chattering. For a safety valve set to open at a pressure of up to 100 pounds per square inch (psi), the minimum blow-back is often specified by standards or industry guidelines.

According to typical standards, blow-back should not be less than 4 pounds for safety valves up to 100 psi to ensure proper functioning and safety. Therefore, the correct adjustment of the blow-back ring should achieve this specification.

Selecting option b) 4 pounds ensures that the blow-back ring is adjusted appropriately on the safety valve, maintaining a minimum pressure release of 4 pounds. This adjustment is critical for the proper functioning of the safety valve in preventing overpressure scenarios in the system.