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Piping engineering tutore

  1. Oct 5, 2008 #1
    Dear Engineers,

    I am Noorul Aman. I am a mechanical engineer in the field of PIPING AND CONST/ARCI.
    Here I want to shear whatever I gather the information about engineering field with you.

    Piping/Mechanical Design Drawings
    The primary drawings that a Piping/Mechanical Field Engineer will use in the course of completing
    a field assignment are:
    · Piping and Instrument Diagram (P&ID)
    · Piping Isometric
    · Plot Plans
    · Piping Class Sheets
    · Piping Support Details and Hanger Drawings
    · Vendor Drawings and Manuals
    · Instrument and Tubing Drawings
    · Standard Instrument Details
    · Steam Heat Tracing Drawings
    These drawings along with project installation specifications provide quality guidelines for properly
    completing the assigned system.

    ----------- cont.
  2. jcsd
  3. Oct 5, 2008 #2
    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

  4. Oct 6, 2008 #3
    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)

  5. Oct 7, 2008 #4
    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
    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

  6. Oct 10, 2008 #5
    What is this item?
    i. ISA-100X100X12 ii) ISA-80X50X10 iii)ISLT-100X100
    i. Equal angle size 100x12 THK
    ii. Unequal angle size 80x50x10 THK
    iii. Indian STD light weight tee bar size 100x100
  7. Oct 11, 2008 #6
    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.
  8. Oct 12, 2008 #7
    From which size onwards NB of pipe is equal to OD of Pipe?
    Ans: From the size 14” and onwards NB = OD of pipe.
  9. Oct 13, 2008 #8
    Write down the outside diameter of following pipe?
    i. 3 inch ii) 6 inch iii) 10 inch iv) 14 inch
    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)
  10. Oct 17, 2008 #9
    What is the difference between machine bolt and stud bolt?
    Machine bolt has a head on one side and nut on other side but stud bolt have nuts on
    both sides.
  11. Oct 23, 2008 #10
    While welding of pipe trunion to pipe/reinforcement pad you have to put a hole
    or leave some portion of welding why?
    For venting of hot gas which may get generated due to welding
  12. Oct 24, 2008 #11
    What do you mean by following type of welding?
    i. SMAW ii)TIG
  13. Oct 24, 2008 #12
    What should be the radius of long radius elbow?
    1.5D (Where “D” is the diameter of the pipe)
    14. Normally where do we use the following?
    i. Eccentric reducers ii)Concentric reducers
    i. Eccentric reducers = Pump suction to avoid Cavitation, To maintain elevation (BOP) in
    ii. Concentric reducers = Pump discharge, vertical pipeline etc.

  14. Oct 31, 2008 #13
    Concentric reducer is used in pump suction. (Yes / No). Explain.
    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.

  15. Nov 2, 2008 #14
    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
  16. Nov 14, 2008 #15
    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.

  17. Dec 2, 2008 #16
    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
    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
  18. Aug 11, 2010 #17
    i want to join piping course please guide me
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