Nasser S. Al Hajri Corporation Mechanical Piping Engineer Interview Questions and Answers

The procedure for erecting a Heat Exchanger involves several steps including site preparation, foundation installation, equipment placement, piping connection, and testing.

• Prepare the site by leveling the ground and ensuring adequate space for the equipment

• Install the foundation to support the weight of the Heat Exchanger

• Place the Heat Exchanger on the foundation and secure it in place

• Connect the piping to the Heat Exc...read more

Precautions before starting confined space work

• Identify the confined space and assess the hazards

• Ensure proper ventilation and air quality testing

• Use appropriate personal protective equipment

• Have a rescue plan in place and train all workers involved

• Obtain necessary permits and follow all safety regulations

• Communicate clearly with all workers involved in the job

Alignment of a column can be checked using various methods.

• Visual inspection can be done to check if the column is straight and vertical.

• Laser alignment tools can be used to check the alignment of the column.

• String lines can be used to check the alignment of the column.

• Plumb bobs can be used to check the vertical alignment of the column.

• Optical instruments like theodolites can be used to check the alignment of the colu...read more

Acceptance limit for column alignment is typically 1/500th of the column height.

• The acceptance limit for column alignment is usually specified in the project specifications.

• It is typically 1/500th of the column height.

• This means that for a 20-meter column, the maximum allowable deviation from vertical is 40 mm.

• Alignment is critical for the proper functioning of the column and to prevent damage to the structure.

• Alignmen...read more

Glass is a solid, transparent material made by heating a mixture of silica and other materials.

• Glass is a non-crystalline, amorphous solid

• It is made by heating a mixture of silica, soda ash, and lime

• It can be molded into various shapes and sizes

• It is used in windows, mirrors, lenses, and containers

• Different types of glass include tempered, laminated, and stained glass

Graphene is a thin layer of pure carbon arranged in a hexagonal lattice.

• It is the thinnest material known to man

• It is a good conductor of electricity and heat

• It is incredibly strong and flexible

• It has potential applications in electronics, energy, and medicine