what is nominal bore of pipe

The taper rate for all NPT threads is 116 (34 inch per foot) measured by the change of diameter (of the pipe thread) over distance. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Nominal pipe size refers to only the outside diameter (OD) of a pipe making it somewhat vague. The Stainless Steel 304 Seamless Pipe nominal bore size ranges from inches to 16 inches, the ERW pipes range from inches to 24 inches and the EFW pipes range from 6 inches to 100 inches. API = American Petroleum Institute NB is also frequently used interchangeably with NPS. For example, for a 12 NPS (DN 300 mm) pipe, schedule 40, the OD and wall thickness are respectively12.75 inches (324 mm) and 0.406 inches (10.4 mm). In both methods, raw material is first cast into ingots. Increased Pressure Ratings. Pipe is measured in nominal sizes which do not equate to the outside diameter, 2" nominal bore for instance actually measures 60.33mm which is just over 2 3/8". NPS is related to the reference nominal diameter, DN, used in international standard. = Double High precision can do small batch production. For reducing tee and cross, the largest run opening should be given first, followed by the opening size at the opposite end. E.H. = Extra Heavy For process engineers, the most important information is the pipe Internal Diameter (ID), as this is used in Certain pipe characteristics can be controlled during production. Our annual sales volume over 70,000 tonnes in India and Worldwide, has won us the dealership and distributorship of renowned seamless (JINDAL, ISMT) and welded steel pipes manufacturing companies across the globe. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. Poly Pipe Dimensions PE 80, SDR21- SDR13.6; Nominal Ball SDR21. Training Online Engineering, National Standard Taper Pipe Threads NPT Chart, Fluid Flow Engineering and Design Resoures, Hydraulic, Pneumatic Engineering & Design, Schedule 40 Steel Pipe Sizes & Dimensions ANSI, Schedule 80 Steel Pipe Sizes & Dimensions ANSI, Standard Size Steel Pipe Weights With Contents Calculator, Xtra Strong (XS) Size Steel Pipe Weights Calculator, Double Xtra Strong (XXS) Size Steel Pipe Weights Calculator, Velocity and Flow Capacity of Oil Standard Tubes, Velocity and Flow Capacity of Oil Schedule 40 Pipe, Velocity and Flow Capacity of Oil Schedule 80 Pipe, Velocity and Flow Capacity of Oil Schedule 160 Pipe, Steel Pipe Flow Friction Loss for sizes 10" to 12 " inch diameter, Friction Losses in Steel Pipes size 0.5 to 1.25 inch diameter, Friction Loss in Steel Pipe 1.5" to 3" inch diameter, Steel Pipe Flow Loss Friction for sizes 4 " to 8 " inch diameter. | Contact, Home Increasing the wall thickness of the pipe increases the mechanical strength of the pipe, allowing it to handle higher design pressures. Std. Technical Information; Pipe Schedules Dimensions and Theoretical Weights ANSI B36.19 & 36.10 UPPER FIGURE Wall thickness in mm; LOWER FIGURE Weight per metre in kilos: This will decrease cost and increase productivity. Using equations and rules in ASME B31.3 Process Piping, it can be shown that pressure rating decreases with increasing NPS and constant schedule. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. Light-weight two-hand circlip pliers help to move the rings to the right place with little effort and with the help of a special locking mechanism. Nom. Nominal pipe size refers to only the outside diameter (OD) of a pipe making it somewhat vague. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! This statement in the article should be For NPS 4 and larger. The hollow pipe is then extruded through a die and mandrel combination to reduce the outside diameter and to expand the inside diameter. Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. Specific pipe is identified by pipe diameter and another non-dimensional number for wall thickness referred to as the Schedule (SCH). Pipe bore/nominal diameter; The pipe schedule is nothing but the wall thickness of the pipe. Engineering Forum There are two types: internal rings that are used in bores and external rings that are used on shafts. DN is the European equivalent of NPS but shows pipe sizes differently than NPS. The sizes of all pipes range from 1/8 inches to 30 inches. For example, when we say pipe size is 2 NPS, it refers to all the pipes having 2.375-inch (or 60.3 mm) as outside diameter irrespective of wall Online Books & Manuals As the thin working tips are sensitive to overloading, the largest possible pliers for the existing ring should always be used. With the help of this hole, the tips can be gripped safely and the ring can be moved to the intended location. Nominal Pipe Size is loosely related to the inside diameter of Schedule 40 pipe. Only emails and answers are saved in our archive. However the common range of pipe sizes is from 32mm to 1200mm. If used with pipe covering protection saddle, see pipe insulation chart for size of pipe roll. NPT is defined by ANSI/ASME standard B1.20.1. Stainless steel pipe, tube, fittings, flanges and valves. Good job team process piping. Seamless pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow liquids and gases (fluids), slurries, powders and masses of small solids. If the pipe fitting is a tee, the branch pipe size is given last. However the Nominal Pipe Size (NPS) and Outside Diameter (OD) values are not always equal, which can create confusion. All rights reservedDisclaimer | Since 1988, NERO Pipeline Connections have supplied high quality stainless steel pipe fittings, tubes, valves and flanges to a wide range of customers and industries throughout the UK - we are also the official UK distributor of FD Lok products. A screw thread is the essential feature of the screw as a simple machine and The terms nominal bore (NB) and DN are used interchangeably with NPS. Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; =. Speaking of large: With circlips over 140 mm in diameter, the actuating forces for one-hand pliers are too great. Initially there are only three pipe wall thicknesses in use . Even larger diameters are possible with the development of appropriate extrusion dies. The metric equivalent is called DN or "diametre nominel". DH Stainless supply on a regular basis to the following market sectors. The different tip shapes of our circlip pliers help you to react flexibly to different assembly situations. Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. 2. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2000 - Few general rules regarding nominal pipe size (NPS) and schedule. The Stainless Steel 304 Welded Pipe is welded from a narrow piece of sheet or a strip. Hollow pipe is far stiffer per unit weight than solid members. Feedback Advertising Thus: It is worth bearing in mind that wall thicknesses come within a specified tolerance, depending onthe engineering standard used. It can be used for structural applications. For NPS 5 and larger, the Nominal Diameter (DN) is equal to the NPS multiplied by25. or Sch.) NB (nominal bore) is the European designation equivalent to NPS is DN (diamtre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimeters. for wall thickness. Print Product Data Sheet. with BS10:62. The standard pipe dimension tables shown above are valid for most of the pipe materials including the pipes made up of wrought iron, wrought steel, stainless steel , polyvinyl chloride (PVC) and CPVC. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. Engineering Toolbox Cold-drawn special-section seamless pipes are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction. Seamless steel tubes for pressure purposes. Schedule 80 has same dimensions as XS. of the covering should not be greater than the O.D. Google use cookies for serving our ads and handling visitor statistics. That means the impact could spread far beyond the agencys payday lending rule. The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings. Stainless steel pipes are most often available in standard weight sizes (noted by theSdesignation; for example,Sch 10S). 1803, KWC, Kalamboli Steel Market, New Mumbai, Office No. Call Us +918928722715 | +919167989294 | Email Us - [email protected] It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size in millimetres of the bore (ID) or outside diameter (OD) of the end connections. Contact us for expert technical advice with applications, grade selection and product working pressures. Pipe size is specified by two designations: a nominal pipe size (NPS) for diameter based on inches, and a schedule (Sched. Angle between sides of thread is 60 degrees. What is Nominal Pipe Size? These applications will - due to browser restrictions - send data between your browser and our server. Schedule Double Extra Strong (XXS) wall is thicker than schedule 160 from NPS 1/8in to NPS 6in inclusive, and schedule 160 is thicker than XXS wall for NPS 8in and larger. Nominal Bore (NB) is the European designation equivalent to NPS is DN (diamtre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimeters. For over 30 years, NERO has remained a leading stockholder and supplier offering same day dispatch, next day delivery and exceptional Outside diameters for metric and imperial standards are indicated in the table below. The special feature of retaining ring pliers: a narrow surface with a centered hole. There have been many revisions and additions to the tables of pipe sizes based on industry use and on standards fromAPI,ASTM, and others. The use of NPS does not conform to American Standard pipe designations where the term NPS means "National Pipe Thread Straight". Retaining rings are a slim design version of circlips - they taper at the opening and are gripped there. Initially thinner pipe schedules 5S and 10S had been created and afterwards other S sizes followed later. When dealing with circlips, one thing must be noted: The size of the ring and the size of the circlip pliers must always be coordinated. With a straight tip, you can guide the locking ring directly to the corresponding groove. AddThis use cookies for handling links to social media. If roll is to support covered pipe, the O.D. However stainless steel pipe can also be available in other schedules. Schedule Standard (STD) is identical to SCH 40S, and 40S is identical to 40 for NPS 1/8 to NPS 10, inclusive. A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. Engineering Videos As the pipe schedule changes, the ID of the pipe changes. For plumbing works, pipe size is referred to as nominal pipe size (NPS) whose metric equivalent is the nominal diameter (DN) and conform to the International Standards Organization (ISO). 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. In plumbing pipe size is referred to as nominal pipe size - NPS, or "Nominal Pipe Size". We procure significant quantities of materials from Indian carbon steel pipe mills and overseas manufacturers of stainless steel pipes. Pipe ID = 12.75 inches 2 x 0.406 inches = 11.94 inches, or. The pipe ID is given A typical wall thickness tolerance is 12.5%. The term NB (nominal bore) is also frequently used interchangeably with NPS. Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. A pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow liquids and gases (), slurries, powders and masses of small solids. If your protocol is a sub-study of an existing study, please include a brief description of the parent study, the current status of the parent study, and how the sub-study will fit with the parent study. : 4, BIT Chawl, Sandhurst Road Station Mumbai : 400 009, Carbon Steel Pipes & Stainless Steel Seamless Pipes, Fittings, Flanges and Bars Manufacturers, Call Us +918928722715 | +919167989294 | Email Us -, Carbon Steel (CS) Pipes Price List Jindal, ISMT, China, Stainless Steel 304 Seamless Pipes Price List, Stainless Steel 304L Seamless Pipes Price List, Stainless Steel 321/321H Seamless Pipes Price List, Stainless Steel 316/316L Seamless Pipes Price List, Stainless Steel 310/310S Seamless Pipes Price List, Stainless Steel 317L Seamless Pipes Price List, Duplex Pipes Price List UNS S32205/2205/1.4462, Carbon Steel Seamless Pipe Dimensions, ANSI B36.10, Stainless Steel Pipe Dimensions, ANSI B36.19, Mild Steel Pipes Dimensions IS 1239, IS 3589, IS 4923, Click Here to Read About Manufacturing Process of Seamless Pipes, ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing, Stainless Steel 310S Pipes in Guwahati (1.4845, UNS S31008), Mild Steel Flanges Manufacturers (MS Flanges), Seamless Pipe Suppliers in Coimbatore, Tamil Nadu, Super Duplex Steels (UNS S32760 / UNS S32750), Swage Nipple and Bull Plugs MSS SP-95, BS 3799, Click Here For Steel Seamless & Welded Pipes Price List 17 December 2018, Difference Between Seamless and Welded Pipes, We Sell Round Bars at Best Prices in India Updated Price List, materials and grades of forged pipe fittings, Black and Hot-dipped Zinc-coated Steel Pipes Seamless, Seamless Carbon Steel for High Temperature Service, Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes, Seamless Carbon Steel Boiler Tubes for High Pressure, Seamless Cold-drawn Intermediate Alloy Steel Heat-Exchanger and Condenser Tubes, Seamless Medium-carbon Steel Boiler and Superheater Tubes, Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger Tubes, Seamless Carbon and Alloy Steel for Mechanical Tubing, Seamless Cold-drawn Carbon Steel Feedwater Heater Tubes, For seamless ferritic alloy-steel pipe for high-temperature service, Seamless Steel Tubes for Elevated Temperature, St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36. NB (nominal bore) is also frequently used interchangeably with NPS. Steel pipe superior performance, relatively dense metal. Other controllable characteristics include length, coating material, and end finish. OD is the outside diameter of the pipe and is fixed for a given size. Circlip pliers with angled tips of 45 or 90 degrees enable the assembly and disassembly of circlips in difficult spaces, and they also make it easier to see into the work area because your hand and the pliers are positioned next to and not above one another. Given our extensive network for sourcing the best quality goods at most competitive prices, we are a preferred seller of steel products for various turnkey project in India and Worldwide. Outside diameter (OD) is the outside diameter of the pipe and is fixed for a given size. Updated July 10, 2018. We are a pioneer in the stainless steel pipes, carbon steel pipes and alloy steel pipes manufacturing and processing industry. Sizes smaller than 1/8 inch are occasionally used for compressed air, while sizes larger than 2 inches are uncommon, due to the use of alternative methods of joining that are used with these larger sizes. Specifies the Seamless steel tubes used for Mechanical and Automobile. For a given schedule number, the OD increases with NPS while the wall thickness either stays constant or increases. We don't collect information from our users. or Sch.) Weldability strong, high compression capability. There is greater ability to use multi-hole dies for diameter sizes that are smaller. O.D. 1. Cookies are only used in the browser to improve user experience. Shouldnt it? For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. Seamless pipe is thought to be able to withstand higher pressure, higher temperatures, higher mechanical stress and a corrosive atmosphere. In vehicle and mechanical engineering, circlips are often used to fix bearings. National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. Excel App. Pipe schedule sets the pipe wall thickness. In plumbing pipe size is referred to as nominal pipe size - NPS, or "Nominal Pipe Size". Dbl. High precision cold drawn products, good surface quality. It is then made into a pipe by stretching the steel out into a seamless tube or forcing the edges together and sealing them with a weld. 3.2 Reducing Fitting Size. NPS 1/8 ~ 4 inch corresponding to DN 6 ~100. With over 250 tons of sale in stainless steel and carbon steel pipes every day, Metallica has emerged as a prominent vendor for many buyers in India and Overseas. Nominal Pipe Size and Schedule collectivelysets the pipe outside diameter (OD) and the wall thickness (and hence the internal diameter (ID) is automatically fixed). Please contact 01254 237 409 for more information. NPS is often incorrectly called National Pipe Size, due to confusion with national pipe thread (NPT). If roll is to support bare pipe, select the size directly from nominal pipe size. Pipes are usually produced by two distinct methods which result in either a welded pipe or a seamless pipe. For retaining rings with straight flanks in the separating slot, we again offer special pliers with a corrugated, non-slip outer surface that ensure that you have the expansion of the external ring under control at all times. a technical knowledge base for all the process piping professionals around the world, Tags: nominal borenominal diameternominal pipe sizeschedule. For example, NPS 14 Sch 40 has an OD of 14 inches (360mm) and a wall thickness of 0.437 inches (11.1mm). Tube is measured in the outside diameter, often supplying the wall thickness allowing the inside diameter to be calculated. Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements. 2016 Edition, Fundamentals of Dimensional Metrology 6th Edition, An Introduction to Measuration and Calibration, Fully Automatic Digital Rockwell Hardness Tester, Testing the Hardness and Durability of Metals (Classic Reprint), A Study of the Relation Between the Brinell Hardness and the Grain Size of Annealed Carbon Steels, On Depth Sensing Indentation of Materials: Mechanical Characterization, Hardness Testing: Principles and Applications First Edition, Fixed Limit Gages (Plugs and Rings) Resources, External ACME Thread General Purpose Size Chart, Internal ACME Thread General Purpose Size Chart, Cylindrical Taper Gages Technical Information, Tap Drill Sizes for Metric M-Profile Screw Threads, Tap Drill Sizes for Unified Inch Screw Threads, USCTI Table 311 - Standard Pipe Dimensions, Straight & Taper - Ground Thread, USCTI Table 303 - Special Fine Pitch Taps, Short Series - Ground, USCTI Table 302A - Optional Neck & Shortened Thread Length Tap, USCTI Table 302 - Standard Tap Dimensions - Ground Thread. Welded seam of steel pipeis the weakest link. The ID of the pipe can be easily calculated, as long as the pipe NPS and schedule are known. of the pipe for which the roll was designed. Formal theory. NPS = Nominal Pipe Size O.D. The taper rate for all NPT threads is 116 (34 inch per foot) measured by the change of diameter (of the pipe thread) over distance. ASME - American Society of Mechanical Engineers A Table of the Most Common Standard Pipe Sizes. DH Stainless and our sister company, DH Press Fit, are leading UK stainless steel tube stockists. Pressure drop (as a general rule, the pressure drop should not normally exceed 0.1 bar/50 m. The term NB (nominal bore) is also frequently used interchangeably with NPS, Standard Pipe Schedules (40, 80, 160, etc..) Related Resources --> Bottom of this webpage. National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. Theres also better control of wall thickness. However, there is a clerical error in the article it seems. DH Stainless stock the widest range of stainless steel piping and tubular products. Nominal Bore (NB) is another equivalent designation of NPS. Data given in based on the NPS Tables given by ANSI B36.10M and includes Pipe wall thickness, outside diameter, nominal diameter. STD has same dimensions as Schedule 30. Engineering Book Store For example, the diameter of the pipe is often modified depending how it will be used. Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. These also include grip rings. Established in 1975, the Metallica Metals Group has its operations spread across major cities in India. Outside Diameter Uniformity of Shape particularly on heavy wall sections and a lack of weld seams and increased structural integrity. Often the type of steel will also have an impact on pipes strength and flexibility. Downloads Nominal diameter of a PE100 pipe is its external diameter, not its internal bore diameter. It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members.. To assemble and disassemble these quickly and safely, KNIPEX offers you a wide range of circlip tools. The wall thickness of the pipe can also be controlled. As discussed above, for a given Nominal Pipe Size (NPS), the pipe Outside Diameter (OD) remains constant. This means that the actualinternal pipe diameter may vary slightly from that quoted above. Today we have a range of wall thicknesses, namely: Stainless steel pipes, due to less risk of failure due to non-corrosive property, permitted the use of pipes with thinner wall thickness. Schedule 40 has same dimensions as STD. Some of our calculators and applications let you save application data to your local computer. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is therefore different from the nominal diameter. Schedule Extra Strong (XS) is identical to SCH 80S, and 80S is identical to 80 for NPS 1/8 to NPS 8, inclusive. Seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. If you click on a link and make a purchase we may receive a small commission. Please read AddThis Privacy for more information. The following chart gives standard pipe schedule or pipes sizes as given by ANSI / ASME B36.10M and API 5L . Plot No. These hold onto the shaft with pure gripping force and are therefore assembled or disassembled with a modified form of circlip pliers for external rings. Outside diameter. "The holding will call into question many other regulations that protect consumers with respect to credit cards, bank accounts, mortgage loans, debt collection, credit reports, and identity theft," tweeted Chris Peterson, a former enforcement attorney at the CFPB who is now a law Hydraulic and pneumatic power system, low-voltage circuit, power steering, fuel circuit, vibration reduction, and such. However with the advancement of industrial age and use of pipes in varying pressure and temperature conditions, these three sizes did not fit all applications. 2022, by Engineers Edge, LLC www.engineersedge.com Last but not least, retaining ring pliers complete the range of circlip pliers from KNIPEX. PE100 can be manufactured in a wide range of pipe diameters from 16mm to 2000mm. For example, when you say 6 pipe, the 6 is the nominal size of that pipe. All Rights Reserved. The terms Nominal Bore (NB)andNominal Diameter (DN) are also frequently used interchangeably with Nominal Pipe Size (NPS). Dimensions in acc. The angle between the taper and the center axis of the pipe is 1 47' 24" (1.7899). There are special forms of circlips on the market. Buy quality Grade Fe 410 MS Pipe at best price, check IS 3589 Gr 410 Seamless Tubes, Gi Welded and ERW Pipe Material Specification and Thickness. Seamless Pipes can be cold-drawn or hot rolled. Nominal Bore (NB) is European Designation equivalent to NPS. You can target the Engineering ToolBox by using AdWords Managed Placements. ANSI - American National Standards Institute The European (ISO) designation equivalent to NPS is DN (diamtre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimetres. However, since theseamless steel pipehas not been welded, it does not have seams, making it equally strong around the entire circumferenceofthepipe. Pipe ID = 324 mm 2 x 10.4 mm = 303.2 mm. Seamless tubes are typically more light weight, and have thinner walls. You see: No matter which pliers are required when installing or removing circlips: With 80 different circlip pliers, KNIPEX always has an answer! In order to give you the best possible orientation, the permissible ring diameters are printed on all circlip pliers from KNIPEX. Our products are exported to over 70 countries across the world, while in India we have supplies to even the remote areas. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The diameter can range from tiny pipes used to make hypodermic needles, to large pipes used to transport gas throughout a city. We don't save this data. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. Please contact 01254 237 409 for more information. Nominal Pipe Size(NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. Nominal Bore Pipe. Nominal pipe size (NPS) is the number that defines the size of the pipe. The Nominal Diameter equals to NPS * 25. 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SDR17 SDR13.6 Min OD Mean Bore Avg Wall Mean Bore Avg Wall Mean Bore Avg Wall; 20: 17 For NPS 5 and larger, the Nominal Diameter (DN) is equal to the NPS multiplied by 25. It can be found in a wide range of applications such as in oil and gas, refinery, nuclear device, petrochemical, chemical, fertilizer, power, automotive, bearing, mechanical and structural, ship building and boiler industries. DH Stainless Ltd The angle between the taper and the center axis of the pipe is 1 47' 24" (1.7899). line sizing calculations. by the pipe NPS minus double the pipe wall thickness (which can be obtained from the pipe schedule). 3. Commonly-used sizes are 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, and 2 inch, appearing on pipes and fittings by most U.S. suppliers. Engineering Calculators If you are considering seamless steel pipes for your next commercial pipe project, please get in touch with us and request a quote. For example, when we say pipe size is 2 NPS, it refers to all the pipes having 2.375-inch (or 60.3mm) as outside diameter irrespective of wall thickness and thus the inside diameter.
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