10+ Roechling Industrial India Interview Questions and Answers

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 interchangeable in terms of pressure and temperature ratings.

• The choice...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 is the same as the total diameter.

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.

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, and low-pressure pipelines.

• Serrated finish flanges are often...read more

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 pressures.

• Pipes are manufactured through extrusion or weldi...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 applications.

• Ring type joint (RTJ) flanges have a groove and are us...read more

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 requires certification and approval from the authorized inspect...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.

• The test pressure is usually 1.5 times the design pressure...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.

• Examples of skills taught in PWST include pipe cutting, fitt...read more