Piping: Time for Quiz!

Mungkin nggak ada salahnya kalau kita coba-coba menjawab beberapa pertanyaan yang sering muncul apda saat interview atau paling tidak untuk sekadar menambah wawasan:

Open Book.

  1. What is the Piping Code for Design of piping systems in Process Piping, Power Piping?
  2. What is the difference between Pipe and Tube?
  3. What is NB and OD?
  4. From which size onwards NB of pipe equal to OD?
  5. Can you remember what is the OD of the following pipe without looking to the book?
    1/2 in
    3/4 in
    1 in
    2 in
    3 in
    4 in
    6 in
    8 in
    10 in
    12 in
  6. When do we use Eccentric Reducer and Concentric Reducer?
  7. Why can’t we use Concentric Reducer at pump suction ? Explain.
  8. What is the different between Machine Bolt and Stud Bolt?
  9. When do we need Dampener, Expansion Joint and Mechanical Snubber? and Why?
  10. Do you know the rule of thumb for piping stress analysis around the pump? Please describe.
  11. Do you know the rule of thumb for piping stress analysis around compressors, turbine and heat exchanger? Please describe.
  12. Do you know the rule of thumb for piping stress analysis aroound tower or pressure vessel? Please describe.
  13. What is Steam Tracing?
  14. Why Full Bore Pipe is using in connecting pipeline of launcher?
  15. When checking Piping Stress Sketch, what parameter you normaly need to check?
  16. What Code you normaly use for checking the Nozzle load on Compressors, Turbine, Heat Exchanger, Pump, Air Cooler?
  17. What is the ANSI/ASME Code for dimensional Steel Flanges and Fittings?
  18. Name the Flange Facing.
  19. Do you know the flange facing called as AARH?
  20. If you would like to make a branch connection, from which side pipe normaly take the branch connection?
  21. Control Valve. What kind of support arangement on Control Valve?
  22. Why do wee need to provide HPV (High Point Vent) and LPD (Low Point Drain) in Piping?
  23. Do you know about Weldolet, Sockolet? Please Explain.
  24. What is the normal upstream and downstream straight length of orifice flow meter?
  25. What is composite flange?
  26. Do you know about Insulated Joint? Pleas explain.
  27. What are insulating gasket kits?
  28. Have you done the analysis of Jacketed Piping? What do you normaly need to consider during analysis?
  29. What do you need to take into account when performing stress analysis around Tank?
  30. What is the relation between Brinnell Hardness Number and Rockwell Hardness Number?
  31. What is the minimum distance between two welds in a pipe?
  32. During fabrication, you observed that one samll crack has appeared on a fresh plate, what type of measure you will take to obtain desired quality with minimum wastage?
  33. Describe the different types of destructive and non-destructive tests?
  34. What is PWHT? Why is it required?
  35. What is the minimum thickness of pipe that requires stress relieving to be done as per ASME B31.3?
  36. What is NACE MR-0175 for?
  37. Hydrotest Pressure. Do you know how to calculate the test Pressure? Please describe.
  38. Do you know heat exchanger? What fluid in Shell Side and what fluid in Tube Side?
  39. Do you know Glandless Piston Valves. Where these valves are used?
  40. Have you done estimation of piping system during proposal? How do you do that?
  41. Why do we need to do Stress Analysis?
  42. What are the steps in piping stress analysis?
  43. Tell me about the type of the stressess during normal operation?
  44. What do you need to prepare and and then to input into CAESAR II or Autopipe for Stress Analysis?
  45. What type of loads available in the stresss analysis calculation? Please Explain.
  46. Do you know about Load Cases in Stress Analysis? Please Explain.
  47. What is Load Case for Sustained Load, Expansion Load, Stress Range, Occasional Load, Spring?
  48. What is the failure theory under ASME B31.3?
  49. Do you know what type of piping failure during its operation?
  50. What is the desired life cycle for piping during operation?
  51. How to calculate thermal expansion in a pipe?
  52. Do you know SIF (Stress Intensification Factor)? Explain and give some examples?
  53. Pipe Support. What is the pipe support span?
  54. What is the criteria to determine the span of pipe support?
  55. How do we decide an anchor point at Expansion Loop on pipe rack?
  56. What is the steam out condition?
  57. On Heat Exchanger, where do you provide an anchor support and slotted support? and Why?
  58. Do you know PTFE on Support? Why we need that?
  59. Tell me about spring support.Why we need it? And how many type of spring support? Explain as much as you can.

from many sources, including experience
PS: Jawabannya nanti ya..

19 responses to “Piping: Time for Quiz!

  1. 1. B31.1

    2. Pipe is identified by NB and thickness is defined by Schedule whereas Tube is
    identified by OD.

    3. From the size 14” and onwards NB = OD of pipe.

    4. From the size 14” and onwards NB = OD of pipe.

    6. i. Eccentric reducers = Pump suction to avoid Cavitation, To maintain elevation (BOP) in rack.
    ii. Concentric reducers = Pump discharge, vertical pipeline etc.

    7. Cause 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.

    8. Machine bolt has a head on one side and nut on other side but stud bolt have nuts on both sides.

    41. 1. To ensure that the stresses in piping components in the system are within
    allowable limits
    2. To solve dynamic problems developed due to mechanical vibration, fluid
    hammer, pulsation, relief valves, etc
    3. To solve problems associated due to higher or lower operating temperature such as a) Displacement stress range b) Nozzle loading on connected equipments c) Pipe displacements d) Loads & moments on supporting structure

    42. 1. Identify the potential loads that the piping system would encounter during the life
    of the plant
    2. Relate each of these loads to the stresses and strains developed
    3. Get the cumulative effect of the potential loads in the system
    4. Decide the allowable limits the system can withstand without failure as per code
    5. After the system is designed to ensure that the stresses are within safe limits

    43. Axial Stresses (Tensile / Compressive), Shear Stresses, Radial Stresses, Hoopes
    Stresses.
    44.i) Pipe Size ii) Fluid Temperature iii) Pipe Material
    iv)Design pressure v)Insulation Thickness
    vi)Specific gravity vii)Friction coeff. viii) Model

    Mohon dikoreksi dan ditambahkan jika ada yang kurang…Mas Donn…

    Trims

  2. saya belum jawab.
    tapi terima kasih pertanyaan-2 ini diungkap kembali.
    biasanya kita-2 yang sudah lama bergelimang kalkulasi pipe stress analysis, suka kelupaan jawaban dari pertanyaan-2 tersebut (kayak orang nyetir mobil atau motor lah.)

  3. coba jawab dech, tapi belum sempat “open book” nich.

    1. What is the Piping Code for Design of piping systems in Process Piping, Power Piping?
    -: ASME B31.4 & B31.1
    2. What is the difference between Pipe and Tube?
    -: tube is with smaller size & thickness than pipe. used for instrument components. or for venting/draining use.
    3. What is NB and OD?
    -: NB = normal bore. regular dimension of pipe diameter.
    OD = outside diameter.
    4. From which size onwards NB of pipe equal to OD?
    -: 14″ and above
    5. Can you remember what is the OD of the following pipe without looking to the book?
    1/2 in
    3/4 in
    1 in
    2 in
    3 in
    4 in
    6 in
    8 in
    10 in
    12 in
    -: hehehe…. i can’t rememeber
    6. When do we use Eccentric Reducer and Concentric Reducer?
    -: when we want to avoid liquid or gas trapping inside the flow.
    7. Why can’t we use Concentric Reducer at pump suction ? Explain.
    -: as answer at no. 6, there will be liquid trap, then this will produce hammer or hard vibration
    8. What is the different between Machine Bolt and Stud Bolt?
    -: guessing…. stud bolt is used to install two flanges. stud bolt can be tightened from two side.
    9. When do we need Dampener, Expansion Joint and Mechanical Snubber? and Why?
    -: guessing…. dampener & mech snubber are used when calculation meet unstable supporting.
    expansion joint is used to reduce reaction force.
    10. Do you know the rule of thumb for piping stress analysis around the pump? Please describe.
    -: nope. i know only the design criteria of piping system around pump.
    11. Do you know the rule of thumb for piping stress analysis around compressors, turbine and heat exchanger? Please describe.
    -: nope.
    12. Do you know the rule of thumb for piping stress analysis aroound tower or pressure vessel? Please describe.
    -: check of piping settlement between header line and tank/vessel nozzle.
    13. What is Steam Tracing?
    -: same as heat insulation. to keep the delta temperature inside the pipe.
    14. Why Full Bore Pipe is using in connecting pipeline of launcher?
    -: in order to avoid locking-trip of pigging
    15. When checking Piping Stress Sketch, what parameter you normaly need to check?
    -: a. line routing & number
    b. dimensions & support locations
    c. design/operating temperature & pressure
    d. pipe specification
    e. code & standard
    16. What Code you normaly use for checking the Nozzle load on Compressors, Turbine, Heat Exchanger, Pump, Air Cooler?
    -: Do you mean standard ?
    API Std 611 = NEMA SM23  Turbine
    API Std 617  Centrifugal Compressor
    API Std 618  Reciprocating Compressor
    API Std 661  Air Fin Cooler
    API Std 610  Pump
    17. What is the ANSI/ASME Code for dimensional Steel Flanges and Fittings?
    -: ANSI B16.9 ?
    18. Name the Flange Facing.
    -: Raised-Face, Flat-Face & Ring-type Joint
    19. Do you know the flange facing called as AARH?
    -: nope
    20. If you would like to make a branch connection, from which side pipe normaly take the branch connection?
    -: gas, vertical 90deg. liquid, horizontal 90deg.
    21. Control Valve. What kind of support arangement on Control Valve?
    -: put supports closer to the valve. add guide on both supports. add stopper on one of the supports.
    22. Why do wee need to provide HPV (High Point Vent) and LPD (Low Point Drain) in Piping?
    -: to avoid hammer. this usually happening in pocket line.
    23. Do you know about Weldolet, Sockolet? Please Explain.
    -: weldolet connects header & branch, welded on the surface, with no pipe branch plug into inside pipe; than that is used in sockolet.
    24. What is the normal upstream and downstream straight length of orifice flow meter?
    -: 5D – 10D ?
    25. What is composite flange?
    -: flange made from non-metal material ?
    26. Do you know about Insulated Joint? Pleas explain.
    -: nope
    27. What are insulating gasket kits?
    -: no, I don’t know
    28. Have you done the analysis of Jacketed Piping?
    What do you normaly need to consider during analysis?
    -: nope. but, I have received lesson about it.
    29. What do you need to take into account when performing stress analysis around Tank?
    -: pipe settlement. (data of land-lowering around tank.)
    30. What is the relation between Brinnell Hardness Number and Rockwell Hardness Number?
    -: can’t remember it … hehehe
    31. What is the minimum distance between two welds in a pipe?
    -: as maximum pipe long per piece ? 6m ?
    32. During fabrication, you observed that one small crack has appeared on a fresh plate, what type of measure you will take to obtain desired quality with minimum wastage?
    -: i don’t get the idea…
    33. Describe the different types of destructive and non-destructive tests?
    -: same as no. 32
    34. What is PWHT? Why is it required?
    -: Post Weld Heat Treatment.
    35. What is the minimum thickness of pipe that requires stress relieving to be done as per ASME B31.3?
    -: i don’t know
    36. What is NACE MR-0175 for?
    -: i don’t know
    37. Hydrotest Pressure. Do you know how to calculate the test Pressure? Please describe.
    -: for B31.3 pipe, hydrotest pressure = 1.5 x MAOP/MAWP for rating 300 & below. for 400# & above, use 1.5 x design pressure.
    for B31.8 pipe, HT pressure = 1.1 to 1.5 x design pressure.
    38. Do you know heat exchanger? What fluid in Shell Side and what fluid in Tube Side?
    -: hot gas or fire in shell and steam-water in tube.
    39. Do you know Glandless Piston Valves. Where these valves are used?
    -: nope
    40. Have you done estimation of piping system during proposal? How do you do that?
    -: by separating first, all line number into critical lines and non-critical ones. then connect all critical lines into a system and made them in amount of calculation numbers.
    41. Why do we need to do Stress Analysis?
    -: to ensure safety in piping design, in its systems.
    42. What are the steps in piping stress analysis?
    -: gather all data needed, make pipe stress sketch (put nodal numbers in it) as per critical line list, calculate to analyze, manually (simplified method) or by computer software, reporting.
    43. Tell me about the type of the stressess during normal operation?
    -: primary (sustain) and secondary (thermal)
    44. What do you need to prepare and and then to input into CAESAR II or Autopipe for Stress Analysis?
    -: Code used, design pressure, design/operating temperature, test pressure, material properties (size, material type, sch./w.t, CA, SY/SC/SH, poisson ratio, pipe density), fluid density, insulation data (type & density), support location, equipment data, environment data.
    45. What type of loads available in the stresss analysis calculation? Please Explain.
    -: sustain load : inside pressure, pipe (incl. valves, flanges, etc.) weight
    thermal load : ambient, design & operating temperatures
    46. Do you know about Load Cases in Stress Analysis? Please Explain.
    -: normal are sustain, operating & expansion load.
    additional are environtment load & mechanical load.
    47. What is Load Case for Sustained Load, Expansion Load, Stress Range, Occasional Load, Spring?
    -: sustain : weight (specific gravity/density) + inside pressure
    expansion : delta temperature
    stress range : — i don’t know —
    occasional : wind, earthquake/seismic, external force, slug/hammer, reaction froce of PSV
    48. What is the failure theory under ASME B31.3?
    -: SL (sustain) >< SY
    49. Do you know what type of piping failure during its operation?
    -:
    50. What is the desired life cycle for piping during operation?
    -: based on ASME B31.3, around 7000 cycles
    51. How to calculate thermal expansion in a pipe?
    -: delta L = exp. coeff. x delta T x L
    52. Do you know SIF (Stress Intensification Factor)? Explain and give some examples?
    -: stress max value occuring because of material repositioning.
    ex. : tee, ellbow
    53. Pipe Support. What is the pipe support span?
    -: distance between two pipe supporting point.
    54. What is the criteria to determine the span of pipe support?
    -: depend on size + wall thk. & fluid density
    55. How do we decide an anchor point at Expansion Loop on pipe rack?
    -: near to end of pipe rack.
    56. What is the steam out condition?
    -: i don’t know… 😦
    57. On Heat Exchanger, where do you provide an anchor support and slotted support? and Why?
    -: support near to inlet & outlet nozzle should be slotted support. then another one is anchor/fixed support.
    58. Do you know PTFE on Support? Why we need that?
    -: when we don’t want over-force (vertical and/or horizontal) acting at pipe support.
    59. Tell me about spring support.Why we need it? And how many type of spring support? Explain as much as you can.
    -: Spring support is needed to absorb over load (force) or over displacement occured becuse of restrained-pipe.
    type of spring : variable & constant
    variable is used when there is sufficient distance around pipe, so that the spring support can travel thoroughly. this is used for absorp over-force reacted at rigid-type support.
    constant is used when there is only small dimension of distance. this is used as variable plus stabilize center position of pipe in the system.

    wuiiihhh…. keringetan juga ngisi nya nich…..
    kalo salah, ya maap. maklum pengalaman belum 2 angka….

  4. 23. Do you know about Weldolet, Sockolet? Please Explain.
    weldolet connects brach and header for buttweld pipe (BE) and the size 2″ and above (common) and sockolet for socket welded pipe (PE) and the size 2″ and under. (pl. correction)

    31. What is the minimum distance between two welds in a pipe?
    the minimum distance is 50mm (2″) after welding. (pl. correction)

  5. Wah, thanks a lot for all of you.

    terima kasih telah menurunkan “ilmu kanuragan” pipingnya.

    Jawabannya ditunggu nih Pak Donny
    (buat nambah kesaktian, he,he sebelum menjajal dunia “kang ow” oil and gas )

    best regards,

  6. 48. What is the failure theory under ASME B31.3?
    -: SL (sustain) >< Sy

  7. Paks, saya orang awam nih……mau tau dong jawabannya.

  8. Can we have correct answers to all the questions posted. Great quiz !!!

  9. how many expansion loop require for 70m pipe?

  10. hmmm…. I’m still waiting for answers, correction to mine…

  11. I have a question that how to decide the number of bolts for a specific rating of pipe flanges?
    I will wait for reply.
    many thanks

  12. hmm…. still waiting the correct answer from Mr. Donn, and wondering will the answers be in the PPSAdCII book?? hehe

  13. What is the correction answer Mr Donny?

    Waiting mode………

  14. Jawabannya apa Y…..?

    Waiting mode………

  15. Wonderful site.. will come back soon=)

  16. Numpang menjawab bos-bos Piping Engineer🙂

    1. What is the Piping Code for Design of piping systems in Process Piping, Power Piping?(Process Piping : B31.3 ; Power Piping : B31.1)

    2. What is the difference between Pipe and Tube?(Thickness…in B36.10 and B36.19 covers the thickness for Pipe..mean while for the Tube….i don’t know ;p )

    3. What is NB and OD?(don’t know)

    4. From which size onwards NB of pipe equal to OD?(12Inch and Below NB, 14Inch and above OD)

    5. Can you remember what is the OD of the following pipe without looking to the book?
    1/2 in (don’t know)
    3/4 in (don’t know
    1 in (don’t know
    2 in (60mm)
    3 in (89mm)
    4 in (114mm)
    6 in(168mm)
    8 in (234mm)
    10 in (273mm)
    12 in (323mm)

    6. When do we use Eccentric Reducer and Concentric Reducer?(Ecc Red normally used in suction pump and pipe rack. Con Red can be used in vertical Pipe)

    7. Why can’t we use Concentric Reducer at pump suction ? Explain.(the reason is to avoid air trap in suction line)

    8. What is the different between Machine Bolt and Stud Bolt?(don’t know)

    9. When do we need Dampener, Expansion Joint and Mechanical Snubber? and Why?(Expansion Joint can be used in very limited space. Basically it will absorb thermal Expansion of the pipe. Application : Piping around Pump.
    As my understanding dampener and Snubber is used to reduced the piping vibration (CMIIW)

    10. Do you know the rule of thumb for piping stress analysis around the pump? Please describe.(Not clear)

    11. Do you know the rule of thumb for piping stress analysis around compressors, turbine and heat exchanger?(Not clear)

    12. Do you know the rule of thumb for piping stress analysis aroound tower or pressure vessel? Please describe. (not Clear)

    13. What is Steam Tracing?(steam tracing is a steam line which is used to maintain the temperature of the fluid in the main line. From the steam header, basically we will design distribution manifold for the steam tracing, and after specific distance we have to collect the condensate and provide new steam tracing line for the main line. The condensate can be open or close system. If it is open system then the condensate will be drain-off, if it is close system the condensate will be routed back to condensate header for recycling)

    14. Why Full Bore Pipe is using in connecting pipeline of launcher? (don’t know)

    15. When checking Piping Stress Sketch, what parameter you normaly need to check? (Pipe properties, des and ope condition, pipe route)

    16. What Code you normaly use for checking the Nozzle load on Compressors, Turbine, Heat Exchanger, Pump, Air Cooler? (don’t know)

    17. What is the ANSI/ASME Code for dimensional Steel Flanges and Fittings?(Flange 24Inch and below : ASME B16.5 ; 26inch and larger ASME B16.47
    Fittings : ASME B16.11)

    18. Name the Flange Facing.(Rise Face, Flat Face, and Ring Joint)

    19. Do you know the flange facing called as AARH?(no, I don’t)

    20. If you would like to make a branch connection, from which side pipe normaly take the branch connection?For gas or vapour  from top; For liquid  from side

    21. Control Valve. What kind of support arangement on Control Valve? ( 2 support for control valve, one of them is fix, while the other is slide (can be guided)

    22. Why do wee need to provide HPV (High Point Vent) and LPD (Low Point Drain) in Piping?(don’t know)

    23. Do you know about Weldolet, Sockolet? Please Explain.Weldolet is fitting for Butt End Pipe, while sockolet is fitting for Plain End Pipe ( Brancing )

    24. What is the normal upstream and downstream straight length of orifice flow meter?That’s depend on the Beta ratio of the orifice plate. But normally we used the biggest beta ratio ( more safe ). 20D for downstream and 5D for upstream

    25. What is composite flange? (don’t know)

    26. Do you know about Insulated Joint? Pleas explain. Insulated joint is used when metallic underground pipe connected to metallic aboveground pipe (connected by flanges). The purpose is to isolate the Cathodic Protection current so that the current is not flowing on above ground metallic pipe.

    27. What are insulating gasket kits? (don’t know)

    28. Have you done the analysis of Jacketed Piping? What do you normaly need to consider during analysis?No I haven’t

    29. What do you need to take into account when performing stress analysis around Tank? The settlement of the ground due to tank weight)

    30. What is the relation between Brinnell Hardness Number and Rockwell Hardness Number? (I don’t know)

    31. What is the minimum distance between two welds in a pipe? (5times of the Thickness or 50mm which is the larger)

    32. During fabrication, you observed that one samll crack has appeared on a fresh plate, what type of measure you will take to obtain desired quality with minimum wastage? (don’t know)

    33. Describe the different types of destructive and non-destructive tests?
    Destructive Test:
    a) Tensile test, we put axial tensile force to the specimen until it is failure
    b) hardness test, hard to describe,
    c) bending test, by using bending machine, we bend the specimen

    Non-Destructive:
    a) PE, using penetrate liquid
    b) MT, can be used for magnetic metallic
    c) RT, Radio graphic Testing
    d) UT,Ultra sonic test

    34. what is PWHT? Why is it required? PWHT is a stress relieve process by using heat after the welding activity. It is required because we need to restore the mechanical properties of the pipe to its original state.

    35. What is the minimum thickness of pipe that requires stress relieving to be done as per ASME B31.3? for carbon steel pipe 19MM, for low alloy pipe 13MM

    36. What is NACE MR-0175 for? it is a standard that is used for sour service line.

    37. Hydrotest Pressure. Do you know how to calculate the test Pressure? Please describe.(no I don’t)

    38. Do you know heat exchanger? What fluid in Shell Side and what fluid in Tube Side?Yes I know. On the shell side, there is a cool fluid, Tube side is used for the Hot one.

    39. Do you know Glandless Piston Valves. Where these valves are used?(don’t know)

    40. Have you done estimation of piping system during proposal? How do you do that?Yes. basically during Estimation, we received IFP document from the client. If the document is good, then you will get all the information you need, such as piping layout, plot plan, p&id, line list, specification,ect. On the basis of this IFP Document, we Piping Department prepare the BM and The BQ to estimate how much the material cost and how much the construction cost for Piping activity. After this activity has been finished then we also have to prepare MH estimation for this project. Schedule of the project I think will be done by the Project Management.

    41. Why do we need to do Stress Analysis? To ensure that the Pipe System on the plant is in safe condition

    42. What are the steps in piping stress analysis? Identification of critical line, preparing the stress sketch as per piping layout, preparing model using software, checking input, analyze the output, give recommendation if the routing is failed.

    43. Tell me about the type of the stressess during normal operation? There will be Hoop Stress, Bending Stress, and axial Stress

    44. What do you need to prepare and and then to input into CAESAR II or Autopipe for Stress Analysis? We need to prepare stress sketch and all the pipe properties, such as Line Size, Line Material, Line Class, Ope and Des Temp.

    45. What type of loads available in the stresss analysis calculation? Please Explain. (difficult to expain ;p)

    46. Do you know about Load Cases in Stress Analysis? Yes (difficult to explain)

    47. What is Load Case for Sustained Load, Expansion Load, Stress Range, Occasional Load, Spring? (Yes, Difficult to explain)

    48. What is the failure theory under ASME B31.3? no I don’t know

    49. Do you know what type of piping failure during its operation? No I don’t know

    50. What is the desired life cycle for piping during operation? (7000cycle?)

    51. How to calculate thermal expansion in a pipe? (By multiplying coefficient of thermal exp to its length)

    52. Do you know SIF (Stress Intensification Factor)? Explain and give some examples? (SIF is a factor to calculate what is the real stress that will be applied to the component due to difference of the component geometric..for example, straight pipe will have SIF 1, if this pipe connected to elbow, the on the elbow the stress will be higher than the pipe even thought the condition is the same, because the elbow SIF is higher (but I don’t know the value))

    53. Pipe Support. What is the pipe support span? (Max distance of the support to ensure that the deflection due to dead load is limited by a half inch.)

    54. What is the criteria to determine the span of pipe support? (Half inch of the deflection due to dead load)

    55. How do we decide an anchor point at Expansion Loop on pipe rack? (depend on the temperature of the line, higher temp line required shorter distance of the anchor point.)

    56. What is the steam out condition? (Condition when we purging the line for cleaning?)

    57. On Heat Exchanger, where do you provide an anchor support and slotted support? and Why? (Anchor point shall be given on the tube bundle side, that is for maintenance reason, when we pull the tube, we want the equipment remaining fix (not moving))

    58. Do you know PTFE on Support? Why we need
    that? (PTFE or telfon is used to reduce the friction of the support. Then it will affect the nozzle load or any load on the stopper)

    59. Tell me about spring support.Why we need it? And how many type of spring support? Explain as much as you can. (We need the spring support when during operation, the pipe is in lifting condition, which mean it is not supported properly(if we used normal shoe or others). So, with the spring support, when the pipe is lifting, the spring support will also lifted and make sure that the pipe is supported. But we have to check first if we need the spring support or not. When we remove the lifting support and the sustain case still pass the code, this mean that we don’t need the spring support. Just put normal support and let the pipe lifting. There are 2 type of spring support. Variable Spring support and Constant Spring support)

  17. ngasi inspirasi ujian plus bahan interpiew niiihhh…hihihi….. (critanya nemu topik ini pas mau ngeinterpiew pres greduet) hehe….jadi klo yang mau apply pipine/pipeline eng bisa siap2 dari sini… =D

  18. The idea is to make all /entire piping support’s friction factor reduced by using ‘Teflon Pads’ (as the friction coefficient is 0.048 sliding and 0.22 static) is a correct approach or not ?

    What is actual coefficient of friction for Teflon in Static / Sliding conditions. And does static means no relative movement or can there be some relative movement ?

  19. still waiting the complete & correct answer. P Don please spent your time. tq

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