10 frequently asked questions in Piping engineering interview Edgevarsity Blog Edgevarsity
10 frequently asked questions in Piping engineering interview

10 frequently asked questions in Piping engineering interview

A piping engineer is one of the most sought-after designations in the oil and gas industry. The designation may look very attractive but getting there sometimes becomes an uphill task due to the responsibilities, knowledge and skills required. Theoretical knowledge is essential, but practical knowledge holds a similar place as well. Out of everything, cracking the interview is the crucial part of it. Here, we will talk about the 10 frequently asked questions in the Piping engineering interview and some ways as to how you should face them with confidence.

If you are looking for job-oriented courses after graduation or proper subject knowledge, check out the online course for  piping engineering  in detail.

Top 10 Piping Engineering Interview questions

1. Can you explain the usage of metallic expansion joints in brief?

Ans. Metal Expansion joints are primarily used for systems that allow the movement of high-temperature substances such as steam or exhaust gases or absorb movement and vibration.

Metal pipe expansion joints can withstand the design temperatures, pressures and sufficiently allow the required capacity necessary to absorb the thermal growth of the piping system.

2. What is the Stress intensification factor (SIF), and where is it used?

Ans. Stress Intensity Factor (SIF) is the ratio of the intensity of maximum stress to normal stress. It is used as a safety factor to determine localized stress on piping under respective loading. In piping, it is applied to welds, fittings, branch connections etc., where stress concentration and possible fatigue failure are high chances.  

SIF for Reducer and Weld neck Flange is 1.0, SIF for socket weld flange is 1.3.

3. Can you state 2 differences between code ANSI B31.1 and code ANSIB31.3?

 Ans. B31.1 is the code for Power Piping, and B31.3 is for Refinery/Chemical Plant Piping. 

To determine design Stresses, in B31.1, the lowest of the specified minimum tensile strength is divided by 3.5 and; in B31.3, the lowest of the specified minimum tensile strength is divided by 3.

These questions are an integral part of the oil and gas courses for mechanical engineers.

4. What Is Wire Drawing?

Ans. Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling it through a series of dies. 

5. What Is Straight Through Valve?

Ans. The straight-through valve is a particular type of valve that is designed to cater to the needs of erosive and abrasive applications specifically. Its speciality lies in its design of unobstructed full bore that provides excellent performance with low-pressure drop. This valve is the choicest one for dirty, contaminated and powder medium. Handling slurries are easier with Straight Through Valve design. 

6. What type of Pressure Tests are conducted on valves?

Ans. The type of pressure test carried out on valves are the backseat test, shell test, low-pressure closure test and high-pressure closure test.

7. What is the significant difference between the constant And variable spring hanger? 

Ans. As the name suggests, when we use a constant spring hanger, the load remains constant throughout its travel range. But in the case of variable spring hangers, the load varies with displacement. Thus, spring hangers come into the picture whenever there is an upward thermal displacement, and the piping system is taken off from its support position.

8. What do you mean by variability? What is the industry-approved limit for variability?

Ans. Variability= {(Hot Load-Cold load)/Hot load =Spring Constant*displacement/Hot load}. The approved limit for variability for variable spring hangers is 25%.  

9. Which Standard Specifies Trim Numbers For Valve?

Ans. The standard that specifies the Trim number for valves is API 600.

10. What are isolating valves? 

Ans. The types of isolating valves are Rocker valves, diaphragm valve, pinch valve, gate valve, ball valve.
There are tons of more questions that you must be aware of as a part of oil and gas training courses online, but the secret to cracking them is adequate preparation. Just learning questions is a hollow task and to become a sound and knowledgeable piping engineer, in-depth knowledge of the subject is crucial.


by Debashree P

Debashree is an Aeronautical engineer by education and a curious researcher by passion. She is passionate about engineering and technology. She is an avid technology writer who has a knack for developing content for websites, newsletters, blogs, articles, advertising and marketing materials based on the requirements. Technologies of her interest include Aviation, Oil & Gas and AI.