Piping Course

Replies

• 

  amnoorulaman

  Piping and Instrument Diagram
  
  The single most important drawing for the installation of piping systems is the Piping and
  Instrument Diagram (P&ID). It provides the base design description of the required pipe routing
  and sizing, flow direction and slope, instrumentation and controls, insulation, heat tracing, and
  equipment and/or instrument references. This provides a road map to finding other drawings,
  vendor data, and piping information to properly complete the installation. The P&ID does not
  however provide dimensional data or physical locations of any commodities.
  The Piping Line List and the Instrument Index are issued documents which often provide this
  information.
• 

  kingsly

  thank you sir...
• 

  amnoorulaman

  Thank for your response KINGSLY
• 

  udaykirann99

  Thanks, its really useful...
• 

  amnoorulaman

  Welcome
  Thanks Uday
• 

  amnoorulaman

  What is the ASME code followed for design of piping systems in Process
  pipings (Refineries & Chemical Industries)?
  (i) B31.1
  (ii) B31.3
  (iii) B31.5
  (iv) B31.9
  Answer (ii)
• 

  amnoorulaman

  What do you mean by following items?
  i. )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
  Answer:
  i. Indian STD light weight beam, Web size – 400
  ii. Indian STD medium weight beam, Web size – 600
  iii. Indian STD ‘H’ beam, Web size – 350
  iv. Indian STD medium weight channel, Web size –300
  v. Indian STD junior beam, Web size – 150
  vi. Indian STD light weight beam, Web size – 200
  vii. Indian STD medium weight beam, Web size – 450
  viii. Indian STD wide flange beam, Web size – 400
  ix. Indian STD junior channel, Web size – 200
  x. Indian STD light weight channel, Web size – 350
  xi. Indian STD medium weight channel, Web size – 250
• 

  amnoorulaman

  What is this item?
  i. ISA-100X100X12 ii) ISA-80X50X10 iii)ISLT-100X100
  Answer:
  i. Equal angle size 100x12 THK
  ii. Unequal angle size 80x50x10 THK
  iii. Indian STD light weight tee bar size 100x100
  
• 

  amnoorulaman

  What is the difference between Pipe and Tube?
  Ans: Pipe is identified by NB and thickness is defined by Schedule whereas Tube is
  identified by OD.
• 

  amnoorulaman

  From which size onwards NB of pipe is equal to OD of Pipe?
  Ans: From the size 14” and onwards NB = OD of pipe.
• 

  amnoorulaman

  Write down the outside diameter of following pipe?
  i. 3 inch ii) 6 inch iii) 10 inch iv) 14 inch
  Answer:
  i. 3 inch = 88.9mm ii)6 inch = 168.28mm
  iii) 10 inch = 273.06mm iv) 14 inch = 355 mm(OD= Size X 25.4)
• 

  amnoorulaman

  What is the difference between machine bolt and stud bolt?
  Answer:
  Machine bolt has a head on one side and nut on other side but stud bolt have nuts on
  both sides.
• 

  amnoorulaman

  What is soluble dam?
  Answer:
  Soluble dam is a water-soluble material used for restricting the purging gas within the
  pipe.
• 

  amnoorulaman

  While welding of pipe trunion to pipe/reinforcement pad you have to put a hole
  or leave some portion of welding why?
  Answer:
  For venting of hot gas which may get generated due to welding
  
• 

  amnoorulaman

  What do you mean by following type of welding?
  i. SMAW ii)TIG
  Answer:
  ii. SMAW = SHIELDED METAL ARC WELDING
  iii. TIG = TUNGSTEN INTER GAS WELDING
  
• 

  amnoorulaman

  What should be the radius of long radius elbow?
  Answer:
  1.5D (Where “D” is the diameter of the pipe)
  14. Normally where do we use the following?
  i. Eccentric reducers ii)Concentric reducers
  Answer:
  i. Eccentric reducers = Pump suction to avoid Cavitation, To maintain elevation (BOP) in
  rack.
  ii. Concentric reducers = Pump discharge, vertical pipeline etc.
• 

  amnoorulaman

  Concentric reducer is used in pump suction. (Yes / No). Explain.
  Answer:
  No. Air pockets may form if concentric reducer is used at pump suction, which results in
  Cavitation, and cause damage to Pump. To avoid this problem, Eccentric Reducer with
  Flat Side Up (FSU)is used in Pump Suction.
• 

  amnoorulaman

  What do you mean by Cavitation in Pump?
  A pump is designed to handle liquid, not vapour. Vapour forms if the pressure in the
  pump falls below the liquid’s vapour pressure . The vapour pressure occurs right at the
  impeller inlet where a sharp pressure drop occurs. The impeller rapidly builds up the
  pressure which collapses vapour bubbles causing cavitation and damage . This is
  avoided by maintaining sufficient NPSH.
  (Cavitation implies cavities or holes in the fluid we are pumping. These holes can also
  be described as bubbles, so cavitation is really about the formation of bubbles and their
  collapse. Bubbles form when ever liquid boils. It can be avoided by providing sufficient
  NPSH.)
• 

  amnoorulaman

  Re: please help me
  
  

  Soozan

  please answer my question. I'm sorry .I know my question dosn't relate to this forum .
  but I don't know where I shoud ask my question.
  My question: I don't know whether in British and canada universities only seeing the
  IELTS certification or not? I mean do they see the results of IELTS via website (online
  result).
  If there is another websithe which I can ask from them, please tell me.
  This question is important for me... Please.....Please.....Please.....

  Sorry, I dont know.
• 

  Kaustubh Katdare

  Re: please help me
  
  

  amnoorulaman

  Sorry, I dont know.

  Ignore that question. I've moved it to proper thread.
• 

  jignesah.j

  Thanks for this information thats all very useful
• 

  amnoorulaman

  What do you mean by NPSH? How do you calculate it?
  NPSH: Net Positive Suction Head. NPSH is the pressure available at the pump suction
  after vapour pressure is substarcted.
  It is calculated as : Static head + surface pressure head - the vapor pressure of your
  product - the friction losses in the piping, valves and fittings.
  It thus reflects the amount of head loss that the pump can sustain internally before
  vapour pressure is reached.
• 

  amnoorulaman

  thanks jvprime
• 

  amnoorulaman

  What is the ASTM code for the following?
  i. CS pipe ii) CS fittings iii)CS flanges iv)AS pipe P5/P11 v)Cast CS Valves
  Answer:
  i. CS pipe = A106 Gr.B
  ii. CS fittings = A234 Gr.WPB/WPBW
  iii. CS flanges = A105
  iv. AS pipe = A335 Gr P1/P11
  v. Cast CS Valves = A216 Gr.WCB
• 

  engg_vij

  hi
  
  Can anybody explain me that why eccentric reducers are used in control valve assembly ..? Can we use concentric ...if no than why ? explain with strong points ?
• 

  amnoorulaman

  engg_vij

  hi
  
  Can anybody explain me that why eccentric reducers are used in control valve assembly ..? Can we use concentric ...if no than why ? explain with strong points ?

  Hi engg vij
  The answer is available in my blog
  click here
  #-Link-Snipped-#
  and go to General Discussion
• 

  Kaustubh Katdare

  amnoorulaman

  Hi engg vij
  The answer is available in my blog
  click here
  #-Link-Snipped-#
  and go to General Discussion

  IT would be very nice if you could guide the members on the forums as well. 😀