PIPING INTERVIEW QUESTION & ANSWERS PART # - 03

1. What is the difference between pipe and tube? 2. From which size onwards NB of pipe is equal to OD of pipe? 3. Where the welded & seamless pipes are used for carbon steel? 4. What are functions of valves? 5. How valves are classified based on end connection ? 6. What are the steps for valve selection ? 7. What are isolating valves ? 8. What are regulation valves ? 9. What are special valves ? 10. What materials are used for construction of valves ? 11. What is trim ? 12. What are wetted parts of valve ? 13. What are available valve operators ? 14. What is a stem ? 15. What is a rising stem ? 16. What is a non-rising stem ? 17. Where diaphragm valves are used ? 18. What is bleed valve ? 19. What is Drip valve ? 20. What is Throttling valve ? 21. What is a bonnet ? 22. What are the types of bonnets ? 23. Why Gate valves are not suitable for throttling purpose ? 24. What is the basic difference between pipe specification A106 Gr.A/Gr.B/Gr.c ? 25. What is the difference between pipe specification A312 TP 304 & A312 TP304L, A312TP 316 & A312TP 316L?