Why is a self-sealing pump generally not...

🔍 Key Concepts

• Self-sealing (self-priming) pump design and how its sealing lines/glands work • Properties of hot concentrated brine in an evaporator/refrigeration system (scaling, crystallizing, clogging) • Typical causes of unsatisfactory operation in overboard discharge pumps handling dirty or concentrated liquids

💭 Think About

• Which pump component relies on small clearances or small passages that could be affected by solids or crystal formation? • What happens to hot, concentrated brine as it cools slightly or sits in small passages—does it form scale, solids, or stay perfectly fluid? • Out of the four options, which one specifically targets a weakness unique to self-sealing pump design rather than a general piping/strainer problem?

✅ Before You Answer

• Identify how a self-sealing pump maintains its seal or priming (look for small sealing lines or glands). • Ask which option deals with small passages or sealing areas that can be blocked by solids, scale, or crystallized brine. • Eliminate answers that describe problems not unique to the pump type itself (e.g., issues that could occur with any pump and not just a self-sealing one).

Why is a self-sealing pump generally not satisfactory for service as a brine overboard pump?

Hot brine tends to form scale on the impeller peripheral edge.

Brine density at 1.5/32 cannot by maintained.

Hot concentrated brine tends to clog the sealing lines and gland seal rings.

Hot brine tends to clog the brine pump suction line strainer.

🔍 Key Concepts

💭 Think About

✅ Before You Answer