Piping designers play a critical role in building and designing piping systems so that they are capable of carrying out liquids, semi-liquids, and gases. Piping is used for various residential, commercial, industrial and transportation purposes. It is used in various industries such as Oil & gas, petrochemical, off-shore, energy, chemical, EPC, pharmaceutical, cement, and fertilizer. A career in piping can be pursued by professionals having a diploma, bachelor or master's degree in mechanical, chemical or production engineering. Renowned companies such as Samsung engineering, Bechtel, Toshiba, Siemens, L&T, Jacobs, Reliance, and Essar are regularly in search of professionals who have the skills and knowledge related to piping. Piping designing professionals can expect a salary of $105,670 per year. If you are a piping professional looking for a job, here are the Best 10 interview question and answers you must go through:
Question: What are the functions of a valve and how is it selected?
Answer: A valve helps in isolation, regulation, non-return and other special purposes. It can be selected based on what is to be handled (liquid, fluid, gas or powder), nature, construction material, disc type, how to operate, stem type, delivery time, cost and warranty.
Question: Tell me about any 3 types of valves.
Answer: The 3 types of valves commonly used are:
Question: What materials are used for the construction of valves?
Answer: Valves can be constructed using bronze, gunmetal, cast iron, carbon steel, alloy carbon steel, stainless steel, polypropylene and other plastics and special alloys.
Question: What is trim composed of?
Answer: Trim is composed of seat surfaces, stem, back seat bushing and small internal parts that contact surface fluid.
Question: What is wire drawing?
Answer: The premature erosion of the valve seat due to excessive velocity between seat disc and seat when the valve is not closed tightly is called Wire Drawing.
Question: Differentiate Asme B 31.1 and Asme B 31.3.
Answer: The difference between Asme B 31.1 and Asme B 31.3 are as follows:
ASME B 31.1
ASME B 31.3
Includes torsion while calculating sustained stresses
Neglects torsion while calculating sustained stresses
Specific sustained stress calculation
Undefined sustained stress calculation
Does not intensify torsion
Moreover, material allowable stresses and stress increasing due to occasional loads in each of the codes are different.
Question: What are the important parameters of a Spring Datasheet?
Answer: The major parameter that must be addressed while making a spring datasheet are cold load/installed load, spring TAG, vertical and horizontal movement, piping material, piping design temperature, insulation thickness, hydro-test loader, line number etc.
Question: How do you calculate the height of a variable spring hanger?
Answer: The height of a variable spring hanger can be determined by selecting the height from vendor catalogue based on stiffness class and spring size. The height is mentioned in case of base mounted variable spring hanger.
Question: If a proper spring hanger is not made program defined, can you select it? How?
Answer: If a proper spring hanger is not made program defined, it can be selected using the following steps:
Step 1: Decide the location where you want to install it in your system.
Step 2: Remove supports that are not taking the load in thermal operating case.
Step 3: Run Program. Sustained load on the support node is a hot load and the thermal movement in the location is a thermal movement of spring.
Step 4: While assuming variability of spring, calculate
Spring constant = (Hot load x variability) ÷ displacement
Step 5: Enter any vendor catalog with spring constant and hot load to select spring inside the travel range.
Question: What is Variability? What is its industry-approved limit?
Answer: The variability can be determined using the formula below:
Variability = (Hot Load-Cold load) ÷ Hot load
= (Spring Constant x displacement) ÷ Hot load
25% is the limit for variability for variable spring.
The knowledge of answering interview questions of piping can only be obtained after having skills related to the technology. You can learn to pipe anytime and anywhere with the help of the Piping online training course offered by Multisoft Virtual Academy. To read more about the course and to join it, click here. You may visit our website www.multisoftvirtualacademy.com to have a look at 600+ online courses we offer to professionals and corporate companies.
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