Piping Interview Question for Fresher Consists of Several Interview Questions that are important for the piping design engineer. These interview questions will help you learn the basics of piping systems and help you prepare for your interview. Piping Interview Questions may come from many topics such as piping, tubing, comparison, size and thickness of pipes and tubes, fittings, and valves.
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Ans. Some common examples of transportation of fluids in chemical industries are:
Q.2 What are common ways to transport fluids in chemical industries?
Ans. Piping and Tubing are the two most common ways to transport fluid in chemical industries.
Q.3 What is a pipe?
Ans. A Pipe is a hollow cylinder that is used to transport fluids. Pipes generally have a large diameter, a heavy walls with rough surfaces.
Q.4 What are common materials of construction for pipes?
Ans. Various materials can be used in the construction of pipes such as black-iron, wrought-iron, cast-iron, steel, stainless steel, copper, brass, plastics (PVC), glass, etc.
Q.5 Why pipes are generally circular?
Ans. Circular pipes don't have corners, so there is a very little amount of material erosion Square or triangular pipes have corners where materials might deposit and also erosion takes place to a greater extent at corners.
Q.6 How are the diameters of the pipe indicated?
Ans. The diameter of pipes is indicated by nominal pipe size. For larger pipes (diameter more than 12 inches), nominal pipe size represents outer diameter. For smaller pipes (diameter less than 12 inches) there is no relation between any of the inside, outside, and nominal diameter. But nominal diameter will be in between inner and outer diameter. Outer diameter is kept constant for interchangeability of fittings for the same pipe size for the same nominal pipe size.
Q.7 How thickness of the pipe is indicated?
Ans. The thickness of the pipe is indicated by the schedule number. As schedule number increase, inner diameter decrease, and thickness increases. Outer diameter is the same for pipes with the same nominal pipe size and inner diameter changes. Common schedule numbers are 10, 20, 30, 40, 60, 80, 120, 160. 10 schedule numbered pipes are thinnest and 160 schedules numbered pipes are thickest.
Q.8 What is an allowance for expansion and why it's important?
Ans. Pipes are subjected to varying temperatures and pressures. Pipes often contract and expand due to this. So to avoid failure of the pipe, fixed support is not used. Pipes are rested on the roller or hung by chains.
Q.9 What are the selection criteria for different pipes for various applications?
Ans. There are several things considered for the design of the piping system:
Q.10 What is tubing?
Ans. Tubing is a system of tubes connected for specific applications such as heating, cooling, reaction, transfer, etc.
Q.11 What are common materials of construction for tubes?
Ans. Tubes in the tubing system may be fabricated from many different types of materials. Common materials of construction are metals, glass, rubber, plastics, etc.
Q.12 How diameters of tubing are indicated?
Ans. The diameter of tubes is signified by the outer diameter.
Q.13 How thicknesses of various tubing are given?
Ans. The thickness of the tubing is signified by BWG (Birmingham Wire Gauge) which ranges from 24 to 7. Tubes with 24 BWG are thinnest and 7 BWG are the thickest.
Q.14 What is the difference between pipes and tubing?
Ans.
Q.15 What are fittings in piping?
Ans. Fittings are used to join or terminate pipes, change, branch, control or split flow, etc.
Q.16 What are common fittings that are used in chemical industries?
Ans. Common fittings that are used in chemical industries are:
Q.17 What is a valve?
Ans. Valves are used to control the flow of fluids in fluid transportation systems.
Q.18 What are common valves that are used in chemical industries?
Ans. Common types of valves are:
Q.19 How diameter of the pipe affect fluid velocity and pressure drop of the fluids?
Ans. As the pipe diameter increases for a constant flow rate, fluid velocity decreases and pressure drop also decreases.
Q.20 What are some common piping design standards?
Ans. Some important piping design standards are from various institutes are:
So, Do you learn something new today? Found something interesting here? Comment down below your thoughts.
I will add more and more questions as I found new content. Also, If you want to add one of your questions for others to see, Just comment down below.
Piping Interview Questions
Q.1 What are some examples of transportation of fluids in chemical industries?Ans. Some common examples of transportation of fluids in chemical industries are:
- Transportation of cooling water from the cooling tower to equipment
- Feeding water to the boiler for steam generation
- pumping fluids in the heat exchangers
- transferring fluid raw materials to a chemical processing facility
- Pumping crude oil from drilling to a processing facility
- Feed liquid reactants to chemical reactors
Q.2 What are common ways to transport fluids in chemical industries?
Ans. Piping and Tubing are the two most common ways to transport fluid in chemical industries.
Q.3 What is a pipe?
Ans. A Pipe is a hollow cylinder that is used to transport fluids. Pipes generally have a large diameter, a heavy walls with rough surfaces.
Q.4 What are common materials of construction for pipes?
Ans. Various materials can be used in the construction of pipes such as black-iron, wrought-iron, cast-iron, steel, stainless steel, copper, brass, plastics (PVC), glass, etc.
Q.5 Why pipes are generally circular?
Ans. Circular pipes don't have corners, so there is a very little amount of material erosion Square or triangular pipes have corners where materials might deposit and also erosion takes place to a greater extent at corners.
Q.6 How are the diameters of the pipe indicated?
Ans. The diameter of pipes is indicated by nominal pipe size. For larger pipes (diameter more than 12 inches), nominal pipe size represents outer diameter. For smaller pipes (diameter less than 12 inches) there is no relation between any of the inside, outside, and nominal diameter. But nominal diameter will be in between inner and outer diameter. Outer diameter is kept constant for interchangeability of fittings for the same pipe size for the same nominal pipe size.
Q.7 How thickness of the pipe is indicated?
Ans. The thickness of the pipe is indicated by the schedule number. As schedule number increase, inner diameter decrease, and thickness increases. Outer diameter is the same for pipes with the same nominal pipe size and inner diameter changes. Common schedule numbers are 10, 20, 30, 40, 60, 80, 120, 160. 10 schedule numbered pipes are thinnest and 160 schedules numbered pipes are thickest.
Q.8 What is an allowance for expansion and why it's important?
Ans. Pipes are subjected to varying temperatures and pressures. Pipes often contract and expand due to this. So to avoid failure of the pipe, fixed support is not used. Pipes are rested on the roller or hung by chains.
Q.9 What are the selection criteria for different pipes for various applications?
Ans. There are several things considered for the design of the piping system:
- Material of construction of pipe
- Optimum diameter
- The thickness of the pipe
- Total pressure drop
- Total fixed cost of piping
Q.10 What is tubing?
Ans. Tubing is a system of tubes connected for specific applications such as heating, cooling, reaction, transfer, etc.
Q.11 What are common materials of construction for tubes?
Ans. Tubes in the tubing system may be fabricated from many different types of materials. Common materials of construction are metals, glass, rubber, plastics, etc.
Q.12 How diameters of tubing are indicated?
Ans. The diameter of tubes is signified by the outer diameter.
Q.13 How thicknesses of various tubing are given?
Ans. The thickness of the tubing is signified by BWG (Birmingham Wire Gauge) which ranges from 24 to 7. Tubes with 24 BWG are thinnest and 7 BWG are the thickest.
Q.14 What is the difference between pipes and tubing?
Ans.
| Characteristics | Pipes | Tubes |
| Thickness of wall | High Thickness | Low Thickness |
| Surface Characteristics | Slightly Rough Surface | Smooth Surface |
| Joining Methods | Screwing, Flanging, or Welding | Compression Fitting, Flare Fitting or Shouldered Fitting |
| Material of Construction | Black-iron, wrought-iron, cast-iron, steel, stainless steel, copper, brass, plastics (PVC), glass, etc. | Metals, glass, rubber, plastics, etc. |
| Diameter | Diameter signified by nominal pipe size. | Diameter signified by the outer diameter |
| Thickness | Signified by Schedule Number | Signified by BWG (Birmingham Wire Gauge) |
Q.15 What are fittings in piping?
Ans. Fittings are used to join or terminate pipes, change, branch, control or split flow, etc.
Q.16 What are common fittings that are used in chemical industries?
Ans. Common fittings that are used in chemical industries are:
- Join Pipes: Coupling, Union, Nipple, etc.
- Change Flow: Reducer and Expander
- Terminate Pipe: Blind or Plugs
- Change Direction: Elbow, long radius elbow, 90-degree elbow, 45-degree elbow, etc.
- Branching Flow: Tee and Cross
- Controlling Flow: Valves
Q.17 What is a valve?
Ans. Valves are used to control the flow of fluids in fluid transportation systems.
Q.18 What are common valves that are used in chemical industries?
Ans. Common types of valves are:
- Gate Valve
- Globe Valve
- Ball Valve
- Butterfly Valve
- Needle valve
- Quarter Turn valve
- Plug Valve
- Check Valve (Non-Return Valve)
- Diaphragm Valve
- Control Valve
Q.19 How diameter of the pipe affect fluid velocity and pressure drop of the fluids?
Ans. As the pipe diameter increases for a constant flow rate, fluid velocity decreases and pressure drop also decreases.
Q.20 What are some common piping design standards?
Ans. Some important piping design standards are from various institutes are:
- ANSI (American National Standards Institute)
- ASME (American Society of Mechanical Engineering)
- ASME B31.1 - For Power Piping
- ASME B31.2 - For Fuel Gas Piping
- ASME B31.3 - For Process Piping
- ASME B31.4 - For Light Hydrocarbons and Liquids
- Read Other Standard List Here
- ASTM (American Society for Testing and Materials)
- AWS (American Welding Society)
- BS (British Standards)
- IS (Indian Standards)
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