10+ Sterling & Wilson Project Manager Interview Questions and Answers

Pump head loss calculation parameters include friction loss, elevation change, velocity head, and fittings.

• Friction loss due to pipe roughness

• Elevation change between inlet and outlet

• Velocity head due to fluid velocity

• Losses from fittings like elbows, tees, and valves

Primary pump is the main pump responsible for the majority of the pumping work, while secondary pump is a backup pump used in case the primary pump fails.

• Primary pump is the main pump in a system, while secondary pump is a backup pump.

• Primary pump is responsible for the majority of the pumping work, while secondary pump is used only when needed.

• Examples: In a heating system, the primary pump circulates hot water through the system, while the secondary pump kicks in if the pri...read more

Chilled water pipe size requirements depend on flow rate, pressure drop, material, insulation, and system design.

• Flow rate: Determine the required flow rate of chilled water in the system.

• Pressure drop: Calculate the pressure drop to ensure efficient operation.

• Material: Select appropriate pipe material based on temperature and pressure requirements.

• Insulation: Insulate the pipes to prevent heat gain or loss.

• System design: Consider the layout and configuration of the system fo...read more

The refrigeration cycle is a process that removes heat from a space and transfers it to the external environment.

• The refrigeration cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The compressor compresses the refrigerant gas, raising its temperature and pressure.

• The high-pressure refrigerant then flows to the condenser, where it releases heat to the surroundings and condenses into a liquid.

• The liquid refrigerant passes through th...read more

Centrifugal blowers are commonly used in AHUs for their efficiency and ability to handle high volumes of air.

• Centrifugal blowers are preferred for AHUs due to their ability to handle high volumes of air efficiently.

• They are more energy efficient compared to other types of blowers.

• Examples of centrifugal blowers commonly used in AHUs include forward curved, backward inclined, and airfoil designs.

AHU valve connection refers to the connection of valves in an air handling unit for controlling the flow of air.

• AHU valve connection is essential for regulating the flow of air in an air handling unit.

• Valves are typically connected to the AHU ductwork to control the amount of air entering or exiting the unit.

• Properly connected valves ensure efficient operation of the AHU system.

• Examples of AHU valves include damper valves, butterfly valves, and ball valves.

Types of pumps include centrifugal pumps, reciprocating pumps, and rotary pumps.

• Centrifugal pumps use centrifugal force to move fluid through a system.

• Reciprocating pumps use a piston or diaphragm to create pressure and move fluid.

• Rotary pumps use rotating mechanisms to transfer fluid.

• Other types of pumps include gear pumps, peristaltic pumps, and vane pumps.

A chilled water system is a cooling system that uses chilled water to remove heat from a building or process.

• Chilled water systems use water as a cooling medium.

• They typically consist of a chiller, chilled water pumps, and a distribution system.

• Chilled water is circulated through coils or heat exchangers to cool air or equipment.

• Chilled water systems are commonly used in large commercial buildings, data centers, and industrial processes.

• Examples of chilled water systems inclu...read more

AHU components refer to the various parts of an Air Handling Unit that work together to regulate and circulate air in a building.

• Filters - to remove dust and particles from the air

• Coils - for heating or cooling the air

• Fans - to circulate the air

• Dampers - to control the flow of air

• Humidifiers/dehumidifiers - to adjust the humidity levels