10+ Activant Solutions Interview Questions and Answers

The bypass valve can be replaced by isolating the vessel, depressurizing it, and then replacing the valve.

• Isolate the vessel by closing the inlet and outlet valves

• Depressurize the vessel by venting the gas or liquid

• Remove the old valve and install the new one

• Repressurize the vessel and open the inlet and outlet valves

Concentric reducers have a common centerline while eccentric reducers have an offset centerline.

• Concentric reducers are used in vertical piping systems to prevent accumulation of air pockets.

• Eccentric reducers are used in horizontal piping systems to prevent accumulation of solids or liquids.

• Concentric reducers are symmetrical while eccentric reducers are not.

• Concentric reducers are easier to manufacture and install than eccentric reducers.

The carbon percentage in carbon steel varies from 0.05% to 2.0% depending on the grade.

• Carbon steel is an alloy of iron and carbon.

• The amount of carbon in carbon steel determines its strength and hardness.

• Low carbon steel contains less than 0.3% carbon, while high carbon steel contains more than 0.6% carbon.

• Some common grades of carbon steel and their carbon percentage are: A36 (0.26%), 1018 (0.18%), and 1045 (0.45%).

Isolation is the process of separating a system or equipment from its energy source to ensure safety during maintenance or repair.

• Isolation involves disconnecting a system or equipment from its power source, locking it out, and tagging it to prevent accidental re-energization.

• There are two types of isolation: electrical isolation and mechanical isolation.

• Electrical isolation involves disconnecting the electrical supply to the equipment, while mechanical isolation involves blo...read more

Nitrogen purging is done to remove impurities and oxygen from pipelines before commissioning or maintenance work.

• Nitrogen purging is done to create an inert atmosphere inside the pipeline to prevent explosions or fires.

• It is required before commissioning or maintenance work to remove impurities and oxygen from the pipeline.

• Nitrogen purging is also done to prevent corrosion and contamination of the pipeline.

• It is commonly used in the oil and gas industry for pipeline maintenan...read more

I have experience working with various pipe materials and standards including carbon steel, stainless steel, and PVC.

• I have worked with carbon steel pipes in a power plant project.

• I have also worked with stainless steel pipes in a pharmaceutical plant project.

• In a water treatment plant project, I have worked with PVC pipes.

• I am familiar with ASME B31.3, API 5L, and ASTM standards for pipe materials and welding procedures.

Reinforcement fittings are used to strengthen and support piping systems.

• Common reinforcement fittings include tees, elbows, reducers, and couplings.

• Telescoping fittings are used to adjust the length of piping systems.

• Flange fittings are used to connect pipes to other equipment or structures.

• Saddles are used to support piping systems on walls or ceilings.

• Reinforcement fittings can be made of various materials, including steel, copper, and PVC.

• Proper installation of reinforcem...read more

Pipes are used to transport fluids and gases, while tubes are used for structural purposes.

• Pipes have a standardized outer diameter and wall thickness, while tubes have a standardized inner diameter and wall thickness.

• Pipes are typically round, while tubes can be round, square, or rectangular.

• Pipes are often used in plumbing and HVAC systems, while tubes are used in construction and engineering applications.

• Pipes are usually measured by their inside diameter, while tubes are ...read more

Permit to work is a formal written system used to control high-risk activities.

• It is a document that outlines the work to be done and the hazards associated with it.

• It is used to ensure that all necessary safety precautions are taken before work begins.

• It is issued by a competent authority and must be signed by all parties involved in the work.

• Examples include hot work permits, confined space permits, and excavation permits.

Elbow lets change the direction of flow in piping system.

• Elbows are used to change the direction of flow in a piping system.

• They come in different angles such as 45°, 90° and 180°.

• They are available in different materials such as PVC, copper, steel, etc.

• Elbows can be welded or threaded onto the piping system.

• They are commonly used in plumbing, HVAC, and industrial piping systems.

Positive isolation is the process of completely isolating a section of piping or equipment from the rest of the system to perform maintenance or repairs.

• Identify the section of piping or equipment that needs to be isolated

• Close all valves and block all lines leading to and from the section

• Use blind flanges or spectacle blinds to physically block the section

• Ensure that the isolation is secure and pressure tested before beginning work

• Remove the isolation once work is complete a...read more