The terms Pipe and Tube are almost interchangeable, although minor differences exist generally, a tube has tighter engineering requirements than a pipe. There are a few key characteristics that separate tube from pipe: Pipe is always round. You can also get seamless pipe - this is where there is no weld profile in the inside of the pipe. Eg: Copper tube used in plumbing, steel tube used in hydraulics. Tubing is used in structural applications so the outside diameter becomes the important dimension. Tubes are cold rolled and hot rolled. But in actual practice Tubes and Pipes are not the same as both possess different features. The outside diameter is important since it will indicate how much it can hold as a stability factor. I am sure there will be many more differences, so I request the readers to list out those in the comments section. XXS but other schedules are possible, such as 5, 10, 20, 30, 60, 100, 120, 140, 160). Pipes are used for transporting gasses or liquids making it important to know the capacity. Outside diameter of tubes is numerically equal to the corresponding size. Through this article, we will try to investigate all such characteristics based on a few parameters like Size, Shape, Diameter, Thickness, Use, Availability, End Connection, Design Standard, etc. What is High-Frequency Welding? And for tubes, alloy steel onwards (ASTM A209, A213). But in actual practice Tubes and Pipes are not the same as both possess different features. Ans: https://whatispiping.com/dynamic-restraints, Ans: https://whatispiping.com/?s=cold+pull, Ans: Stress Analysis of Pump Piping (Centrifugal) System using Caesar II, Ans:https://whatispiping.com/asme-b-31-3, Ans:https://whatispiping.com/wrc-107-and-wrc-297, Ans: https://whatispiping.com/control-valves/#Control_Valve_Assembly, Ans:https://whatispiping.com/pipe-support-span, Ans:https://whatispiping.com/co-efficient-of-friction, Ans:Modeling of Sway Braces in Caesar II for stress analysis, Ans:Use of Sway Brace, Strut and Snubber for pipe supporting, Ans:Piping Elbow or Bend SIF (Stress Intensification Factor), Ans: Difference between ASME B 31.3 and B 31.1 (B31.3 vs B31.1). Tubes can be square, rectangular, and round. I am very much passionate about blogging and always tried to do unique things. Alloy Steel :- ASTM A182F1/F2/F5/F7/F9/F11/F12/F22. The common Pipes size as ANSI areproduced from size 1/8" to 48". The biggest difference between pipe and tube is there shape. The outside diameter of a pipe is the same for all schedules in nominal pipe diameter. 1. This is supposed to prevent the overlap of HAZs. In the ERW / EFW / HFW pipe process,the first plate is formed in a cylindrical shape and the longitudinal edges of the cylinder formed are welded by flash-welding, low-frequency resistance-welding, high-frequency induction welding, or high-frequency resistance welding. I am running my own business in mechanical fabricaion. Plot No. Even looking on the internet can lead to confusion, as many websites have mistakenly misidentified the real differences between them. The difference between 304, 304H, and 304L is different % of carbon in these grades. This example shows the difference between a 1-1/2 pipe flange and a 1-1/2 tube flange. Tube has no joint down the length. As such, maybe it should be called copper pipe. Difference between pipe and tube? - Glassdoor For more information contact us. What is the Difference between Pipes and Tubes? - Let'sFab Even in cases where the initial cost of galvanizing is higher than alternative coatings, galvanizing is almost invariably cheapest in the long term (because it lasts longer and needs less maintenance). Larsen & Toubro Limited Interview Questions for Graduate Engineer Trainee (Get): Difference between pipes and tubes. For catalyst, flows very long radius elbows are used. Pipes accommodate larger applications with sizes that range from a inch to several feet. [2] a pipe is like a vessel to store a liquid/gas so inside volume is important factor, while a tube is seen as structual member so total volume is important factor. Pipe will always be round however tube can be round, square or rectangular. Differences between Pipe and Tube From a layman's viewpoint, Both Pipe and Tube seem to be the same as they have many similarities like both are hollow, usually made from metals, can transfer fluids, etc. Ans: Basis for deciding Stress critical lines, Ans: https://whatispiping.com/basis-for-deciding-stress-critical-lines, Ans: https://whatispiping.com/column-piping, And: https://whatispiping.com/basics-of-pipe-stress-analysis, Ans: https://whatispiping.com/spring-hangers-common-interview-questions-with-answers, Ans: https://whatispiping.com/supporting-of-piping-systems. Paste as plain text instead, What is the difference between pipe and a tube? - Interview Questions Normally small-bore tube is used in process piping. Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. What is Acoustic-Induced Vibration or AIV? 5. A pipe is Specified by Nominal Pipe Size (NPS) or Nominal Bore (NB). Ans: MITER BEND: How to Calculate Length, Angle of Cut, Weight, and Cut-back of the Miters? The end connection of pipes is normally plain or beveled for welding purposes. I am Varun Patel. Pipe Thickness Calculation of Straight Pipe under External Pressure/ Vacuum Pressure Condition. Piping Interview Questions Part-3 (Material Standards) - HardHat Engineer Pipes are always round, whereas tubes can be square, rectangular or round. 2021 JTCmetals.com. You could Ryerson or Alro. There are actually quite a few differences. However, stainless steel, aluminum, and steel tubing all have measured and stated ODs that are exact or within a specified tolerance, usually in the thousandths of an inch (e.g. I am a Mechanical Engineer turned into a Piping Engineer. link to What is Steam Piping? Tags: Difference Between Tube and Pipe, tubing, 2023 Eagle Stainless Tube & Fabrication, Inc. All rights Reserved. Pipes are always rigid and resistant to bending. Tube wall thickness is expressed in millimeter, or inches, or BWG (Birmingham wire gauge.) In some instances the terms may be used interchangeably, however there is one key difference between tube and pipe, particularly in how the material is ordered and toleranced. Alloy Steel :- ASTM A234 WP1/WP5/WP7/WP9/WP11/WP12/WP22. NPS pipe 14 and up have measured ODs that correspond to the nominal size. 2020 The Wagner Companies, R&B Wagner, Inc. All Rights Reserved. Ans: https://whatispiping.com/design-considerations-expansion-bellow. 1-1/2 pipe size flanges have an opening to fit over 1.90 OD the actual outside diameter of 1-1/2 pipe. What Is The Difference Between Pipe And Tube? Tolerances are set, but rather loose. But tubes can be bent in 3 dimensional form. I am thankful with you for building this very useful and interesting blog.Are there the answers for these interviews in your blog? What is Category M Fluid Service for Process Piping Design? This extra heat transfer surface area is useful when there is a fluid with low ' heat transfer coefficient ' or 'temperature difference (T)' on the outside of the tube. For structural use, tubes are available in custom sizes. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'whatispiping_com-banner-2','ezslot_5',851,'0','0'])};__ez_fad_position('div-gpt-ad-whatispiping_com-banner-2-0');report this ad, Top 180+ Piping Interview Questions with Answers. Tubes can be joined quickly and easily with flaring, brazing, or couplings, but for this reason, they dont offer the same stability, Tolerances are very strict with tubes compared to pipes and tubes are often more expensive to produce than pipes, Pipe manufacturing is easier as compared to tubes. for thinner wall thicknesses, whereas larger measures are expressed with fractional or inch indexes. When it comes to measurement of pipe, it is measure by the inside diameter, often called the nominal diameter. The most common are beveled and plain ends, however for tube it is a quick connection on the site (threaded and grooved ends, couplings, etc). Tubes are usually wrapped with a wooden box or thin film and delivered with much care. Delivered in the bundle as a bulk item. Answers to most of the questions are added here for reference. 1-1/2 pipe size flanges have an opening to fit over 1.90 OD the actual outside diameter of 1-1/2 pipe. Difference between Codes, Standards, and Guidelines, SOP For Airflow Velocity and Uniformity Test, TOP 35 HVAC INTERVIEW QUESTIONS FOR AIR HANDLING UNIT, What are the different Job Opportunities in HVAC Industry? 24. Discover Best Places to work in India. It is measured by outside diameter and wall thickness. At least one of the pipe surfaces is not smooth. Tubes are available as rigid as well as flexible depending on the application. 56 Pipefitter Interview Questions (With Sample Answers) Indeed Editorial Team Updated September 30, 2022 The job of a pipefitter requires you to have knowledge and experience related to installation, testing, repair and maintenance of piping systems. First of all , i really appreciate you works. 31. They're measured by outside diameter (OD), inside diameter (ID), and wall thickness (WT) schedule. Piping QC - Inspectors Questions and Answers [Pipe Fittings] - EngLogs The outside diameter of pipe up to size 12 is numerically larger than the corresponding pipe size. Why is Aveva PDMS better than Intergraph PDS? Your above subject is very informative and you have tried to contain very big topic in short spain. This is also popular by names Radio Frequency Welding, RF Welding, or HF Welding Process. What is a Fired Equipment? What is a Pipe: The pipe is pressure tight circular hollow section that used in piping systems to transport gases or fluids. Difference between Pipes and Tubes? - Mechanical Engineering Questions The most important dimensions for a pipe is the outer diameter (OD) together with the wall thickness (WT). The name TUBE refers to round, square, rectangular and oval hollow sections that are used for pressure equipment, for mechanical applications, and for instrumentation systems. They are specified by their outer diameter and tube wall thickness, in inches or in millimeters. | Introduction to High-Frequency Welding Machine (PDF). A question such as which material grade of pipe, fittings, or flanged you have worked. The thickness of a steel pipe is designated with a "Schedule" value (the most common are Sch. So lets start with the first question. Seamless Steel Pipe is made from a solid round steel billet which is heated and pushed or pulled over a form until the steel is shaped into a hollow pipe. ), Pipe thickness depends on the schedule, so there is no fixed increment, The thickness of tubes increases in standard increments such as 1 mm or 2 mm. It is generally used for structural purpose, the OD is important and exact number. Tubes are produced in small lots (low yield) due to relatively small dimensions and cumbersome inspection and quality control procedures throughout the manufacturing process. The schedule number can be the same on different size pipe but the actual wall thickness will be different. Anonymous on Nov 8, 2020 Interviews > Fermilab To comment on this, Sign In or Sign Up. Tubes are more expensive than pipe due to tighter manufacturing tolerances. Reviews Jobs Interview Questions About Company Salaries Benefits Home . Carbon Steel: ASTM A53 Gr. This is a very common question. The long and short is that the NPS was defined so you would know approximately what ID you were working with and could count on the OD never changing. High-frequency welding is a special type of welding technique used to join thermoplastic materials together. Pipe is normally of a heavier wall thickness. Carbon Steel :- ASTM A181, ASTM A105, ASTM A350 LF1/2. Schedule 40 pipe is the most common, however when extra strength is required schedule 80 is available. Standard pipe schedules or pipes sizes as given by ANSI / ASME B36.10M and API. Fabric Manufacturing Technology Interview Questions . saurabhjain The reason many people, including plumbers, engineers, and others, mistakenly believe NPS refers to the ID on smaller pipes is because of how the standard was originally defined. The standard combinations of pipe Nominal Pipe Size and Wall Thickness (schedule) are covered by the ASME B36.10 and ASME B36.19 specifications (respectively, carbon and alloy pipes, and stainless steel pipes). TUBE :- if we measured the tube thickness we are used following terms like millimeters , inches or BWG (Birmingham wire gauge.) Double Block and Bleed Valve: Introduction, Working, Benefits, Applications, Pipe Expansion Joint Details: Components, Types, Materials, Manufacturers, Hot Sustained Stress (Lift-Off) Checking in Caesar II, Stress Analysis of Vertical Reboiler Piping using Caesar II, 10 Differences between Pressure and Stress, Comparison of Pipe and Tube (Pipe Vs Tube), Static Method of Seismic Analysis of Piping System using Caesar II, Static Method of Wind Analysis of Piping systems in Caesar II using Pressure Vs elevation Method. What is Steam Piping? CPVC(Chlorinated polyvinyl chloride) Chlorinated polyvinyl chloride(CPVC) is athermoplasticproduced by chlorination ofpolyvinyl chloride(PVC)resinwhich is significantly more flexible and can withstand higher temperatures than standard PVC. Ans:11 most important questions & answers from ASME B 31.3 which a Piping stress engineer must know. Will pipe outer diameter 40 mm, will mate 50 mm coupling? Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. Simply copy this code and paste it into your page to share with others. A/B, ASTM A106 Gr. MITER BEND: How to Calculate Length, Angle of Cut, Weight, and Cut-back of the Miters? ), 1D (Where D is the diameter of the pipe.). Our products are exported to over 70 countries across the world, while in India we have supplies to even the remote areas. Tube vs Pipe - The Differences Explained in Plain English - JTC Metals Tubes can round, square and rectangular. Joining pipes is more labor intensive as it requires flanges, welding, threading, etc. In the next video, I will explain to you the flange-related questions. Here, A and B are two weld joints. The life expectancy of galvanized coatings on typical structural members is far in excess of 50 years in most rural environments, and 20 to 25 years plus, even in severe urban and coastal exposure. Ans: Finned tube heat exchangers are characterized by the significantly increased outer tube area. FRP Pipe / GRP Pipes are manufactured by the widely used helical filament winding method. See our complete line of in-stock inventory. Alloy Steel :- ASTM A161T1, ASTM A213T1/T2/T5/T7/T9/T11/T12/T22. Pipes are available as the small bore and the big bore. Steel tubes are produced to very strict tolerances. Carbon Steel :- ASTM A285, ASTM A515, ASTM A516. Steam piping is one of the high-temperature and high-pressure piping systems typically found in power plants and process plants. An interviewer will ask this question to check your fundamentals. Welcome to my space, I am Anup Kumar Dey, an experienced piping engineer for the last 19 years. The thickness of tubes is dependent on the use thickness is decided. What Is the Difference Between Tubes, Pipes and Hoses? A/B/C, ASTM A333 Gr.1/Gr.6. Ans: What is Category M Fluid Service for Process Piping Design? They are more prevalent in the medical area, construction, structural, or load bearing. Pipe is typically ordered using nominal pipe size (NPS) standard and by specifying the nominal diameter (pipe size) and schedule number (wall thickness). Process Engineer Interview Questions - EnggCyclopedia How to decide how many load bearing clip supports to be used?, Hello;Hoy I can get al the questiins and answers?Best regardsRicardo flores, Your email address will not be published. The stated OD and measured OD are generally within very close tolerances of each other. 3. Tube vs Pipe - The Differences Explained in Plain English, Stainless Steel Backsplash - with Shelf / Bar. Tubulars undergo several dimensional quality checks, such as straightness, roundness, wall thickness, surface, during the manufacturing process. The biggestdifference between tubeandpipeis their shape. Stainless Steel: ASTM A312TP304/TP304L/TP304H/TP308/TP310/TP316/TP316L/ TP316H/TP317/TP321/TP321H/TP347/TP347H/TP348/TP348H. The minimum distance between these two joints should be the one-time diameter of the pipe. Pipe is the word used for round tube only. You have probably heard pipe and tube used interchangeably but are they different. _(4.5)? The short answer is: A PIPE is a round tubular to distribute fluids and gases, designated by a nominal pipe size (NPS or DN) that represents a rough indication of the pipe conveyance capacity; a TUBE is a round, rectangular, squared or oval hollow section measured by outside diameter ("OD") and wall thickness ("WT"), expressed in inches or milli. Pipesare always round, whereastubes can be square, rectangular or round. Pasted as rich text. | Introduction to High-Frequency Welding Machine (PDF), Types of Pipes | Classification of Pipes (PDF), https://whatispiping.com/basis-for-deciding-stress-critical-lines, https://whatispiping.com/basics-of-pipe-stress-analysis, https://whatispiping.com/spring-hangers-common-interview-questions-with-answers, https://whatispiping.com/supporting-of-piping-systems, https://whatispiping.com/design-considerations-expansion-bellow, https://whatispiping.com/dynamic-restraints, Stress Analysis of Pump Piping (Centrifugal) System using Caesar II, https://whatispiping.com/wrc-107-and-wrc-297, https://whatispiping.com/control-valves/#Control_Valve_Assembly, https://whatispiping.com/pipe-support-span, https://whatispiping.com/co-efficient-of-friction, Modeling of Sway Braces in Caesar II for stress analysis, Use of Sway Brace, Strut and Snubber for pipe supporting, Piping Elbow or Bend SIF (Stress Intensification Factor), Difference between ASME B 31.3 and B 31.1 (B31.3 vs B31.1).
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