Expertise Contracting Company Interview Questions and Answers for Freshers

CDTP is the Closing Differential Test Pressure, while Set Pressure is the pressure at which a safety valve opens.

• CDTP is the pressure difference between the set pressure and the closing pressure of a safety valve.

• Set Pressure is the pressure at which a safety valve opens to release excess pressure.

• CDTP ensures the safety valve closes properly after relieving pressure, while Set Pressure determines when the valve opens.

• ...read more

Conventional valves have a linear motion while bellows valves have a flexible bellows element for sealing.

• Conventional valves have a linear motion to open and close, while bellows valves use a flexible bellows element for sealing.

• Bellows valves are typically used in applications where leakage prevention is critical, such as in high-pressure or vacuum systems.

• Conventional valves are simpler in design and operation compa...read more

A gasket is a mechanical seal that fills the space between two mating surfaces to prevent leakage.

• Gaskets are commonly used in engines to prevent fluids from leaking out.

• They can be made from materials such as rubber, silicone, metal, or paper.

• Gaskets are often used in plumbing systems to create a watertight seal.

• They come in various shapes and sizes to fit different applications.

Flanges are used in valve shops to connect valves to pipes securely and efficiently.

• Flanges provide a leak-tight connection between valves and pipes

• They allow for easy assembly and disassembly of valves for maintenance or replacement

• Flanges come in various types such as weld neck, slip-on, and threaded flanges

• They help in aligning and supporting the valve properly in the piping system

ASME/ANSI Code of Gasket refers to the standards set by the American Society of Mechanical Engineers and the American National Standards Institute for gaskets used in various industrial applications.

• ASME/ANSI Code of Gasket provides guidelines for the design, materials, dimensions, and performance of gaskets.

• These codes ensure that gaskets meet certain quality and safety standards for use in pressure vessels, piping sy...read more

ASME/ANSI Code Flanges are standardized flanges used in piping systems to ensure compatibility and safety.

• ASME/ANSI Code Flanges are designed to specific dimensions and pressure ratings to ensure compatibility with pipes and valves.

• They are commonly used in industries such as oil and gas, chemical, and power generation.

• ASME B16.5 is a widely used standard for ASME/ANSI Code Flanges.

• These flanges are marked with a press...read more

Standard back pressure in bellow valve is typically around 10-15 psi.

• Standard back pressure in bellow valve is usually around 10-15 psi.

• Back pressure helps to maintain a seal in the valve and prevent leakage.

• Excessive back pressure can cause the valve to malfunction or fail.

• Back pressure can vary depending on the specific application and type of bellow valve.

• It is important to follow manufacturer guidelines for back pr...read more

Control valves are essential components in regulating fluid flow in a system.

• Control valves regulate flow rate, pressure, temperature, and liquid level in a system.

• They consist of a valve body, actuator, and positioner.

• Common types include globe valves, butterfly valves, and ball valves.

• Control valves are used in industries such as oil and gas, chemical, and water treatment.

A mechanical valve testing standard is a set of guidelines and procedures used to ensure the quality and performance of mechanical valves used in various industries.

• Mechanical valve testing standards outline the requirements for design, materials, manufacturing, and performance testing of mechanical valves.

• These standards help ensure that mechanical valves meet safety, reliability, and performance criteria.

• Examples of ...read more

Gate valves are used to control the flow of fluid in a pipeline by opening and closing a gate.

• Gate valves are primarily used for on/off control of flow.

• They are not suitable for regulating flow due to their design.

• Common types include wedge gate valves, parallel gate valves, and knife gate valves.

• Gate valves can be classified based on the type of gate, such as solid wedge, flexible wedge, split wedge, and parallel slid...read more

Globe valves are used to regulate flow in a pipeline by raising or lowering a disc to control the flow of fluid.

• Globe valves have a spherical body with an internal baffle and a movable plug (disc) to control flow.

• They are commonly used in applications where throttling or frequent operation is required.

• Types of globe valves include angle globe valves, straight globe valves, and Y-pattern globe valves.

• Materials used for ...read more

Ball valves are a type of quarter-turn valve that uses a hollow, perforated, and pivoting ball to control flow through it.

• Ball valves are categorized based on the number of ports they have: 2-way, 3-way, or 4-way.

• They can also be classified based on the type of ball used: floating ball valve, trunnion ball valve, or V-port ball valve.

• Materials used for ball valves include stainless steel, brass, bronze, PVC, and carbon...read more

A pressure gauge Testing Standard is a set of guidelines and criteria used to ensure the accuracy and reliability of pressure gauges.

• Pressure gauge Testing Standards specify the methods and procedures for testing pressure gauges.

• They outline the acceptable levels of accuracy and reliability that pressure gauges must meet.

• Pressure gauge Testing Standards may include calibration procedures, testing equipment requirements...read more

Body joint gasket thickness refers to the measurement of the gasket material used to seal the joint between two components.

• Body joint gasket thickness is crucial for ensuring a proper seal and preventing leaks.

• The thickness of the gasket material can vary depending on the specific application and requirements.

• Common thicknesses for body joint gaskets range from 0.5mm to 5mm.

• Proper installation and torque of the fastene...read more

Types of flange faces include raised face, flat face, ring-type joint, and tongue and groove.

• Raised face: a small portion around the bore is raised above the bolting circle for gasket seating

• Flat face: the flange face is flat and does not have any protrusions

• Ring-type joint: a metal ring is used to create a seal between two flanges

• Tongue and groove: one flange has a raised ring while the other has a matching depression...read more

Types of gaskets include spiral wound, ring joint, sheet, and solid metal.

• Spiral wound gaskets are made of a V-shaped metal strip and a filler material.

• Ring joint gaskets are used in high pressure and high temperature applications.

• Sheet gaskets are cut from sheets of materials like rubber, cork, or paper.

• Solid metal gaskets are made of a single piece of metal with no filler material.