Question

Diaphragm pumps are used for ______ pumping

• A. low pressure
• B. high pressure
• C. toxic (or) corrosive liquid
• D. vacuum pressure

Hint:

Positive displacement pumps like diaphragm pumps are also self-priming and can handle high-viscosity fluids, unlike standard centrifugal pumps.
This is useful to remember for industrial equipment selection.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks about the primary industrial application and suitability of diaphragm pumps.
This belongs to fluid transport equipment in chemical engineering.

Step 2: Key Formula or Approach:
Diaphragm pumps are a class of positive displacement pumps that use a combination of the reciprocating action of a flexible membrane (diaphragm) and non-return check valves to move fluids.
The mechanical drive components are completely isolated from the process fluid.

Step 3: Detailed Explanation:

• Isolation Principle: In a diaphragm pump, the reciprocating plunger or fluid drive acts on one side of a flexible diaphragm, while the process liquid is handled on the opposite side.
This design means there are no sliding seals or packing glands in contact with the process fluid.

• Pumping Toxic/Corrosive Liquids: Because there are no rotating seals, the risk of external leakage is eliminated.
This makes the diaphragm pump highly suitable for handling extremely toxic, hazardous, flammable, or highly corrosive liquids.

• Comparison with Centrifugal Pumps: Centrifugal pumps rely on mechanical seals which can wear out and leak over time, causing potential safety hazards when handling dangerous chemicals.
Thus, diaphragm pumps are preferred for safety-critical operations handling toxic or corrosive chemicals.


Step 4: Final Answer:
Diaphragm pumps are designed and preferred for pumping toxic or corrosive liquids.