8.What is the different between Mac

8.What is the different 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.
- 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 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
- 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.
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.
- 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?
- 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
- 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?
- Do you mean standard ? TurbineàAPI Std 611 = NEMA SM23 Centrifugal CompressoràAPI Std 617 Reciprocating CompressoràAPI Std 618 Air Fin CooleràAPI Std 661 PumpàAPI Std 610
17. What is the ANSI/ASME Code for dimensional Steel Flanges and Fittings?
- ANSI B16.9
- Flange 24Inch and below : ASME B16.5 ; 26inch and larger ASME B16.47 Fittings : ASME B16.11)
18. Name the Flange Facing
- Raised-Face, Flat-Face & Ring-type Joint
- (Rise Face, Flat Face, and Ring Joint).
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?
- gas, vertical 90deg. liquid, horizontal 90deg
- from top; For liquid àFor gas or vapour from side
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
- 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?
- 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
- 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)
- 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?
- 5D – 10D ?
- 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?
- flange made from non-metal material ?
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?
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?
- pipe settlement. (data of land-lowering around tank.)
- The settlement of the ground due to tank weight
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?
- as maximum pipe long per piece ? 6m ?
- the minimum distance is 50mm (2″) after welding. (pl. correction)
- 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?
33. Describe the different types of destructive and non-destructive tests?
- same as no. 32
- 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?
- Post Weld Heat Treatment
- 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.
- 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
- 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?
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.
- 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?
- 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
- to ensure safety in piping design, in its systems.
- To ensure that the Pipe System on the plant is in safe condition
42. What are the steps in piping stress analysis?
- 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
- 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.
- 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?
- Axial Stresses (Tensile / Compressive), Shear Stresses, Radial Stresses, Hoopes Stresses.
- primary (sustain) and secondary (thermal)
- There will be Hoop Stress, Bending Stress, and axial Stress

Hasil (Melayu) 1:

8. Apakah perbezaan antara Mesin Bolt dan Stud Bolt?-Bolt Mesin mempunyai seorang Ketua di satu sisi dan nut pada sisi lain tetapi stud bolt mempunyai kacang pada kedua-dua pihak.-meneka... stud bolt digunakan untuk memasang dua bebibir. Stud bolt boleh diikat dari dua sisi.9. Bilakah kita perlu Dampener, bersama pengembangan dan mekanikal Snubber? dan kenapa?-meneka... dampener & snubber jentera digunakan Bilakah pengiraan memenuhi menyokong tidak stabil.-Perkembangan bersama boleh digunakan dalam ruang yang sangat terhad. Pada dasarnya, ia akan menyerap haba peluasan paip. Permohonan: Paip sekitar pam. Sebagai kefahaman dampener yang saya dan Snubber digunakan untuk mengurangkan getaran paip (CMIIW)10. Adakah anda tahu yang ibu jari untuk analisis tekanan paip sekitar pam? Sila terangkan-kagak. Saya tahu hanya kriteria rekabentuk sistem paip sekitar pam...11. Adakah anda tahu yang ibu jari untuk analisis tekanan paip sekitar kompresor, turbin dan penukar haba aliran selari? Sila terangkan.12. Adakah anda tahu yang ibu jari untuk paip tekanan analisis aroound Menara atau kebuk tekanan? Sila terangkan.-Periksa paip penyelesaian antara muncung line dan kapal tangki/tajuk13. Apakah itu mengesan Wap?-sama seperti penebat haba. untuk mengekalkan suhu delta di dalam paip.-mengesan wap adalah garisan wap yang digunakan untuk mengekalkan suhu bendalir di baris utama. Dari header Wap, pada dasarnya kita akan merancang manifold pengedaran bagi mengesan Wap, dan selepas jarak tertentu kita perlu mengumpul kondensat tersebut dan memberikan wap mengesan baris baris utama. Kondensat itu boleh menjadi sistem terbuka mahupun tertutup. Jika sistem terbuka maka kondensat itu akan longkang-off, jika ianya rapat sistem kondensat yang akan dihalakan kembali ke pengepala kondensat untuk kitar semula)14. Mengapa penuh Bore paip sedang menggunakan dalam menyambung paip pelancar?-untuk mengelakkan penguncian-perjalanan pigging15. apabila menyemak saluran paip tekanan lakaran, parameter apa anda normaly perlu menyemak?-penghalaan a. garisan dimensi b. nombor & sokongan lokasi c. Reka bentuk/operasi suhu & tekanan d. paip spesifikasi e. kod & standard-Paip hartanah, des dan ope keadaan, laluan paip16. Apakah kod anda normaly digunakan untuk menyemak beban muncung kompresor, turbin, penukar haba, pam, udara yang sejuk?-Adakah anda bermaksud standard? PCB TurbineàAPI 611 = NEMA SM23 emparan CompressoràAPI PCB 617 Reciprocating PCB CompressoràAPI 618 Penyaman Fin PCB CooleràAPI 661 PumpàAPI PCB 61017. Apakah kod ANSI/ASME dimensi keluli bebibir dan kelengkapan?-ANSI B16.9-Flange 24 inci ke bawah: ASME B16.5; 26 inci dan besar ASME B16.47 kelengkapan: ASME B16.11)18. nama menghadap Flange-Menaikkan-Face, rata-Face & Ring jenis sendi-(Naik muka, permukaan rata dan bersama Cincin).19. Adakah anda tahu menghadapi flange dipanggil sebagai AARH?20. Jika anda ingin membuat sambungan cawangan, dari mana paip sisi normaly ambil sambungan cawangan?-gas, menegak 90deg. cecair, mendatar 90deg-dari atas; ÀFor cecair gas atau wap dari sisi21. kawalan injap. Apakah jenis sokongan arangement pada injap kawalan?-Letakkan menyokong hampir ke injap. menambah panduan menyokong kedua-duanya. Tambah penyumbat pada salah satu daripada sokongan-sokongan 2 untuk kawalan injap, salah seorang daripada mereka adalah membetulkan, manakala satu lagi ialah slaid (boleh dipandu)22. Mengapa wee keperluan memberi HPV (High Point bolong) dan LPD (Low Point Parit) dalam paip?-untuk mengelakkan tukul. ini biasanya berlaku dalam poket23. Adakah anda tahu mengenai Weldolet, Sockolet? Sila jelaskan.-weldolet menghubungkan header & Cawangan, golek atas permukaan, dengan tiada pasang cawangan paip ke dalam paip; daripada itu digunakan dalam sockolet-weldolet menghubungkan brach dan pengepala paip buttweld (BE) dan 2 saiz dan ke atas (biasa) dan sockolet bagi soket paip dikimpal (PE) dan 2 saiz dan di bawah. (pembetulan Guan)-Weldolet merupakan pemasangan bagi punggung hujung paip, manakala sockolet merupakan pemasangan untuk Plain hujung paip (Brancing)24. Apakah normal huluan dan hiliran lurus panjang meter aliran orifice?-5D – 10 D?-Itulah sebabnya bergantung kepada nisbah Beta plat orifice. Tetapi biasanya kita gunakan nisbah beta terbesar (lebih selamat). 20D D hiliran dan 5 Hulu25. Apakah flange Komposit?-flange diperbuat daripada bahan bukan logam?26. Adakah anda tahu mengenai ditebat bersama? Rayuan menjelaskan.-Terlindung sama digunakan apabila paip bawah tanah logam disambungkan ke paip aboveground logam (dihubungkan oleh bebibir). Tujuan adalah untuk mengasingkan Sdn perlindungan semasa supaya arus tidak mengalir di atas alasan paip logam.27. apa akan penebat gasket kit?28. Pernahkah anda melakukan analisis Jacketed paip? Apa yang perlu anda normaly pertimbangkan semasa analisis?29. apa yang perlu anda mengambil kira apabila melakukan analisis tekanan sekeliling kereta kebal?-paip penyelesaian. (data tanah-merendahkan sekitar tangki.)-Penyelesaian tanah disebabkan oleh kereta kebal berat30. Apakah hubungan antara Brinnell kekerasan nombor dan nombor kekerasan Rockwell?31. Apakah jarak minimum antara dua kimpalan di paip?-sebagai paip maksimum panjang setiap keping? 6m?-jarak minimum ialah 50mm (2) selepas pengelasan. (pembetulan Guan)-5times ketebalan atau 50mm yang besar32. dalam fabrikasi, anda diperhatikan retak samll itu satu telah muncul sebuah pinggan yang segar, jenis langkah anda akan mengambil masa untuk mendapatkan kualiti yang diingini dengan pembaziran yang minimum?33. menerangkan perbezaan jenis-jenis ujian musnah dan tanpa musnah?-sama seperti no. 32-Ujian musnah: a) tegangan ujian, kita meletakkan daya tegangan bersama paksi kepada spesimen itu sehinggalah ianya kegagalan ujian b) kekerasan, sukar untuk menerangkan, c) lenturan ujian, dengan menggunakan Mesin lenturan, kita bengkok spesimen-Non-memusnah: a) PE, menggunakan menembusi cecair b) TM, boleh digunakan untuk magnet logam c) RT, Radio grafik ujian d) z, ujian Ultra sonic-34. apa itu PWHT? Kenapa ia diperlukan?-Pos rawatan haba Weld-PWHT adalah tekanan yang melegakan proses dengan menggunakan haba selepas aktiviti kimpalan. Ia adalah perlu kerana kita perlu untuk memulihkan sifat-sifat mekanik paip kepada keadaan asalnya.35. Apakah ketebalan minimum paip yang memerlukan tekanan katil bayi perlu dilakukan seperti ASME B31.3?-bagi keluli karbon paip 19MM, untuk paip aloi rendah 13MM36. Apakah ENCIK NACE-0175 bagi?-ini adalah standard yang digunakan untuk talian perkhidmatan masam37. Hydrotest tekanan. Adakah anda tahu bagaimana untuk mengira ujian tekanan? Sila terangkan.-bagi paip B31.3, tekanan hydrotest = 1.5 x MAOP/MAWP bagi rating 300 & ke bawah. bagi 400# & ke atas, gunakan 1.5 x tekanan Reka bentuk. bagi paip B31.8, tekanan HT = 1.1 untuk 1.5 x Reka bentuk tekanan.38. Adakah anda tahu penukar haba aliran selari? Cecair apa di sebelah Shell dan cecair apa di sebelah tiub?-gas panas atau api di shell dan wap air dalam tiub-Di sebelah shell, terdapat bendalir yang sejuk, sebelah tiub digunakan untuk panas satu.39. Adakah anda tahu Glandless injap omboh. Di mana injap ini digunakan?40. Pernahkah anda melakukan anggaran sistem perpaipan sepanjang cadangan? Bagaimana anda boleh berbuat demikian?-oleh memisahkan pertama, nombor baris semua ke dalam laluan kritikal dan orang-orang yang tidak kritikal. kemudian menyambung semua talian kritikal ke dalam sistem dan menjadikan mereka dalam jumlah pengiraan nombor.- 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?- 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- to ensure safety in piping design, in its systems.- To ensure that the Pipe System on the plant is in safe condition42. What are the steps in piping stress analysis?- 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- 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.- 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 failed43. Tell me about the type of the stressess during normal operation?- Axial Stresses (Tensile / Compressive), Shear Stresses, Radial Stresses, Hoopes Stresses.- primary (sustain) and secondary (thermal)- There will be Hoop Stress, Bending Stress, and axial Stress