Piping Quiz

 Piping Questions Essay

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Experts: Kumar Rudra, Rakesh Patil and Joshua Thinakaran Gas and oil Special Assignments - L& T, Mumbai - India Copyright 2002. All Privileges reserved

Basic 1 . Precisely what is the ASME code used for style of piping devices in Process pipings (Refineries & Chemical Industries)? (i) B31. you (ii) B31. 3 (iii) B31. five (iv) B31. 9 Response (III) 2 . What do you mean by using items? we. )ISLB-400 ii) ISMB-600 iii) ISHB-350 iv) ISMC-300 v) ISJB-150 vi) ISLB-200 vii)ISMB-450 viii)ISWB-400 ix) ISJC-200 x) ISLC-350 xii) ISMC-250 Solution: i. Of india STD light-weight beam, Net size – 400 ii. Indian AN STD medium weight beam, Web size – 600 iii. Indian A SEXUALLY TRANSMITTED DISEASE ‘H' column, Web size – three hundred and fifty iv. Indian STD medium weight channel, Web size –300 sixth is v. Indian STD junior light beam, Web size – a hundred and fifty vi. Indian STD lightweight beam, Web size – 200 vii. Indian AN STD medium weight beam, World wide web size – 450 viii. Indian STD wide flange beam, Net size – 400 ix. Indian A SEXUALLY TRANSMITTED DISEASE junior channel, Web size – two hundred x. Of india STD light weight channel, Web size – 350 xi. Indian STD medium pounds channel, Internet size – 250 a few. What is this kind of item? we. ISA-100X100X12 ii) ISA-80X50X10 iii)ISLT-100X100 Answer: i. Equal angle size 100x12 THK ii. Unequal position size 80x50x10 THK iii. Indian STD light weight first tee bar size 100x100 four. What is the difference between stub in and stub about branches? Identify with design.

Which one is definitely preferred?

Intended for branching of one size lesser of manage pipe, Stub On is usually preferred. Pertaining to other branching less than one particular size of work pipe stub in is preferred. The Design is based on ANSI B 23. 3 your five. What is the difference between Pipe and Tube? Ans: Water pipe is identified by NB and fullness is identified by Plan whereas Tube is determined by Z. 6. That size onwards NB of pipe is equal to OD of Pipe? Ans: From the size 14” and onwards NB = OD of pipe. six. Write down the outside diameter of following tube? i. three or more inch ii) 6 inches iii) 10 inch iv) 14 inches Answer: i actually. 3 inches iii) 10 inch = = 88. 9mm ii)6 inch sama dengan 168. 28mm 273. 06mm iv) 14 inch = 355 mm(OD= Size By 25. 4)

8. What is the difference between machine sl? and guy bolt? Solution: Machine bolt has a go on one part and nut on additional side yet stud bolt have almonds on both sides. 9. What is soluble dam? Answer: Soluble dam is a water-soluble materials for limiting the getting rid of gas inside the pipe. 15. While welding of water pipe trunion to pipe/reinforcement pad you have to put a hole or leave some part of welding so why? Answer: To get venting of hot gas which may get generated due to welding 14. What do you mean using type of welded i. SMAW ii)TIG Answer: ii. SMAW = SHIELDED METAL ARC WELDING

3. TIG


12. Find out the elevation of marked point ‘A'

W. G EL. " A”


Slope 1: 100

several в€… Water line

W. G. EL –100. 050 5000

Answer: Height of noticeable point ‘A' is 100. 050 13. What need to be the radius of long radius elbow? Answer: 1 . 5D (Where " D” is a diameter in the pipe) 16. Normally exactly where do we utilize following? i actually. Eccentric reducers ii)Concentric reducers Answer: i actually. Eccentric reducers = Pump suction to avoid Cavitation, To keep up elevation (BOP) in stand. ii. Concentric reducers = Pump launch, vertical canal etc . 15. Concentric reducer is used in pump suction. (Yes as well as No). Make clear. Answer: Number Air storage compartments may type if concentric reducer can be used at pump suction, resulting in Cavitation, and cause damage to Pump. To avoid this problem, Eccentric Reducer with Level Side Up (FSU)is used in Pump Suction. 16. What do you mean by Cavitation in Pump? A pump is designed to take care of liquid, not really vapour. Fumes forms in case the pressure inside the pump is catagorized below the liquid's vapour pressure. The vapour pressure arises right at the impeller outlet where a sharpened pressure drop occurs. The impeller speedily builds up the pressure which in turn collapses vapour bubbles causing cavitation and damage. This is certainly avoided by managing sufficient NPSH. (Cavitation...

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