Delhi New born Centre Interview Questions and Answers

The complete process of a cross country pipeline project involves planning, design, construction, testing, and commissioning.

• Planning phase: Identify project objectives, route selection, environmental impact assessment.

• Design phase: Engineering design, material selection, pipeline alignment.

• Construction phase: Clearing and grading, trenching, welding and joining, coating and insulation.

• Testing phase: Hydrostatic testing, non-destructive testing, leak detection.

• Commissioning p...read more

Hydrotest is a pressure test conducted on pipelines to check for leaks and structural integrity.

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

• The pressure is maintained for a specified duration to check for leaks or any other defects.

• The test also checks the structural integrity of the pipeline by measuring the amount of deformation under pressure.

• The test is usually conducted before commissioning the pipeline to ensure its safety...read more

Hydrotest involves filling the equipment with water and pressurizing it to check for leaks or defects.

• Equipment is filled with water and pressurized to a specified level

• Pressure gauges are used to monitor the pressure

• The equipment is held at the specified pressure for a set amount of time

• After the test, the water is drained and the equipment is inspected for leaks or defects

• Equipment and instruments used include pumps, hoses, pressure gauges, and safety valves

Major defects in welding and how to eliminate them

• Porosity

• Incomplete fusion

• Cracks

• Undercutting

• Lack of penetration

• Contamination

• Improper electrode storage

• Proper welding technique and equipment maintenance can eliminate most defects

The instrument used in joint coating process is a profile gauge. Acceptance criteria for surface roughness is specified in the project specifications.

• Profile gauge is used to measure the surface roughness of the joint coating.

• Acceptance criteria for surface roughness is specified in the project specifications.

• Surface roughness is measured in microns or mils.

• Surface roughness should be within the specified range for the joint coating to be accepted.

WPS is a welding procedure specification, WQT is a welding qualification test, PQR is a procedure qualification record, and PQT is a performance qualification test.

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

• WQT is a test that ensures the welder is qualified to perform the welding process outlined in the WPS

• PQR is a record that documents the results of a welding procedure qualification test

• PQT is a test that ensures the welded product meet...read more

Various codes and standards are followed for laying pipelines to ensure safety and quality.

• API 1104 - Welding of Pipelines and Related Facilities

• ASME B31.4 - Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids

• ASME B31.8 - Gas Transmission and Distribution Piping Systems

• ISO 13623 - Petroleum and Natural Gas Industries - Pipeline Transportation Systems

• DOT Pipeline Safety Regulations - 49 CFR Parts 192 and 195

Vent pipe is used to equalize the pressure inside and outside the casing during installation of pipelines.

• Vent pipe is installed in the annular space between the carrier pipe and casing.

• It helps to prevent the formation of a vacuum or pressure differential during installation.

• It also allows for the escape of air or gas trapped in the annular space.

• Vent pipe should be installed at the highest point of the casing.

• It should be capped after installation to prevent debris from ent...read more