Think Gas Distribution Senior Engineer Interview Questions, Process, and Tips

Various grades of steel pipe are used in CGD (City Gas Distribution).

• Different grades of steel pipe are used in CGD based on factors like pressure rating, temperature, and application requirements.

• Common grades of steel pipe used in CGD include API 5L Grade B, ASTM A106 Grade B, and ASTM A333 Grade 6.

• Higher grades of steel pipe may be used for high-pressure applications or in corrosive environments.

• The selection of ste...read more

The type of welding and electrode used depends on the specific application and materials being joined.

• Common types of welding include arc welding, MIG welding, TIG welding, and spot welding.

• The choice of welding method depends on factors such as the type of metal, thickness, and desired weld quality.

• For example, arc welding often uses electrodes made of materials like carbon steel, stainless steel, or cast iron.

• MIG wel...read more

E6010 is a type of electrode used in welding that produces deep penetration and is commonly used for welding in the vertical and overhead positions.

• E6010 is a classification of welding electrode according to the American Welding Society (AWS) system.

• It is a cellulose-based electrode that provides excellent arc stability and deep penetration.

• The 'E' in E6010 stands for electrode, while the '60' indicates the tensile str...read more

Hydrotest is a process of testing the strength and integrity of a pressure vessel or pipeline.

• Hydrotest involves filling the vessel or pipeline with water and pressurizing it to a specified level.

• The pressure is held for a specified duration to ensure there are no leaks or failures.

• Air volume calculation is used to determine the amount of air needed to pressurize the vessel or pipeline.

• The formula for air volume calcul...read more

A dead weight tester is a device used to calibrate pressure gauges by applying known weights to a piston.

• Consists of a piston-cylinder assembly and a set of calibrated weights

• Weights are placed on the piston to generate a known pressure

• Pressure generated is compared to the reading on the gauge being calibrated

• Used for high-precision calibration of pressure gauges

• Commonly used in industries such as oil and gas, aerospac

Common welding defects include porosity, undercutting, and lack of fusion. Acceptance criteria vary based on the type of defect.

• Porosity: voids or gas pockets in the weld. Acceptance criteria depend on the size and location of the porosity.

• Undercutting: groove in the base metal near the weld. Acceptance criteria depend on the depth and length of the undercut.

• Lack of fusion: incomplete bonding between the weld and base ...read more

WPS is Welding Procedure Specification, PQR is Procedure Qualification Record, WQT is Welder Qualification Test, EQT is Equipment Qualification Test.

• WPS is a document that outlines the welding process to be used for a specific job.

• PQR is a record of the welding parameters used during a test weld.

• WQT is a test that certifies a welder's ability to perform a specific type of welding.

• EQT is a test that certifies the equipm

Seam pipe has a welded seam while seamless pipe is made without any seam. CGD uses seamless pipes for better safety and efficiency.

• Seam pipes have a welded seam while seamless pipes are made without any seam.

• Seam pipes are cheaper than seamless pipes.

• Seamless pipes are stronger and more reliable than seam pipes.

• CGD (City Gas Distribution) uses seamless pipes for better safety and efficiency.

• Seamless pipes are used in h...read more

TCP is a protocol that provides reliable, ordered, and error-checked delivery of data between applications.

• TCP stands for Transmission Control Protocol.

• It is a connection-oriented protocol that operates at the transport layer of the OSI model.

• TCP provides reliable, ordered, and error-checked delivery of data between applications.

• It establishes a connection between two hosts and ensures that data is transmitted correctl...read more

The longest pipeline route in India is the 1,397 km long Mundra-Pathanamthitta pipeline. The longest pipeline in the world is the Druzhba pipeline.

• The Mundra-Pathanamthitta pipeline is used to transport crude oil from Gujarat to Kerala.

• The Druzhba pipeline is a network of pipelines that runs from Russia to several European countries.

• The Druzhba pipeline is approximately 4,000 km long.

• Other long pipelines in India inclu...read more