Dangote Refinery Interview Questions and Answers

IBR piping refers to piping systems that comply with the Indian Boiler Regulations (IBR) for the design, fabrication, and installation of boilers and associated equipment.

• IBR piping is used in industries where boilers are employed, such as power plants, refineries, and chemical plants.

• It ensures the safety and efficiency of the piping system by following specific guidelines and standards set by the IBR.

• IBR piping requi...read more

Hydro test is a process of testing the strength and integrity of piping by filling it with water and pressurizing it.

• Hydro test is conducted to ensure that the piping system can withstand the design pressure and is free from leaks.

• The piping is filled with water and pressurized to a specified pressure for a specified duration.

• During the test, the piping is visually inspected for leaks, bulges, or any other deformities.

• ...read more

PWST stands for Piping and Welding Skills Training.

• PWST is a training program that focuses on developing skills in piping and welding.

• It provides hands-on training in various aspects of piping and welding techniques.

• PWST covers topics such as pipefitting, welding processes, blueprint reading, and safety procedures.

• The program aims to prepare individuals for careers in the field of piping engineering and construction.

• Ex...read more

The basic difference between Pipe specification A106 Gr.A / Gr.B/ Gr.C is the carbon content and mechanical properties.

• A106 Gr.A has the lowest carbon content and is suitable for low-temperature applications.

• A106 Gr.B has a slightly higher carbon content and is commonly used for high-temperature applications.

• A106 Gr.C has the highest carbon content and offers better mechanical properties.

• Gr.B and Gr.C are interchangeab...read more

Flanges can be classified based on facing into several types.

• Flanges can be classified as flat face (FF), raised face (RF), ring type joint (RTJ), tongue and groove (T&G), and male and female (M&F) facing.

• Flat face (FF) flanges have a flat surface and are used for low-pressure applications.

• Raised face (RF) flanges have a raised surface to provide a sealing area and are commonly used in medium to high-pressure applicati...read more

Flanges can be classified based on face finish into several types.

• Raised face flanges

• Flat face flanges

• Ring type joint flanges

• Tongue and groove flanges

• Male and female flanges

Smooth finish flanges are used for low pressure applications, while serrated finish flanges are used for high pressure applications.

• Smooth finish flanges have a flat surface and are typically used in low pressure systems.

• Serrated finish flanges have a grooved surface and are used in high pressure systems to provide better grip and sealing.

• Smooth finish flanges are commonly used in water supply systems, HVAC systems, an...read more

The most commonly used material for gaskets is rubber.

• Rubber is widely used due to its excellent sealing properties.

• It is resistant to various fluids and can withstand a wide range of temperatures.

• Rubber gaskets are commonly used in piping systems, engines, and industrial applications.

• Other materials like cork, silicone, and graphite are also used depending on the specific requirements.

Pipe and tube are both cylindrical hollow structures used for fluid transportation, but they differ in their dimensions and manufacturing processes.

• Pipe is measured by its inner diameter (ID) and wall thickness, while tube is measured by its outer diameter (OD) and wall thickness.

• Pipes are typically used for conveying fluids under pressure, while tubes are used for structural applications or conveying fluids at lower p...read more

NB of pipe is equal to OD of Pipe from size 14 inches onwards.

• NB stands for Nominal Bore and represents the internal diameter of a pipe.

• OD stands for Outside Diameter and represents the total diameter of a pipe.

• For most pipe sizes, the NB is smaller than the OD.

• However, from size 14 inches onwards, the NB of the pipe is equal to the OD.

• This means that for pipes with a size of 14 inches or larger, the internal diameter ...read more

Piping refers to the system of pipes used to transport fluids or gases from one location to another.

• Piping can be made of various materials such as steel, copper, or plastic.

• It is used in various industries such as oil and gas, chemical, and water treatment.

• Piping systems can be complex and require careful design and installation to ensure safety and efficiency.

• Piping can be used for various purposes such as transporti...read more