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This topic has been archived. This means that you cannot reply to this topic. I am being told that pipe class refers to the maximum internal pressure a pipe can safely sustain while pipe schedule refers to the thickness of pipe. But how are they independentthe thickness of pipe will determine how much internal pressure it can sustain. Isn't it? A 4" Carbon steel pipe of Schedule 40 should have a unique class or it can have different class?
Posted 27 August - AM Thickness is determined by formulae given in respective code. Posted 27 August - AM Ayan: There are various misunderstandings and misconceptions regarding the classification of piping — and most of these originate primarily because some engineers simply don't employ their common sense. Some would like to pretend that there is an almighty, all-powerful agency somewhere that dictates what a pipe is, will be, and shall be by established and enforced "laws", codes, or "standards".
No such animal exists. You are being told the wrong information if you are told "pipe class refers to the maximum internal pressure a pipe can safely sustain". In most cases, the flanges are the weakest point - and this should be the guiding design factor with regards to allowable pressure in that specific piping class ification. A pipe class is a document normally prepared by an operating or engineering company for use within its confines and which contains the definition of pipe and all related components that are to be used under a specific pressure, temperature condition — including sometimes the service they are in.
A typical definition contains the material specification, type, rating, and dimensional data. A certain pipe schedule is often established for certain services. This is dictated by the classification, based on the need and the application. A pipe schedule to be used and serves as the basic specification for the pipe thickness and dimensions. You should know that the hoop stress equation is what determines the pipe thickness, so you shouldn't be asking whether the pipe thickness determines the allowable working pressure.
The most popular schedule, by far, is Sign In Need an account? Register now! I've forgotten my password. Remember me This is not recommended for shared computers.Having trouble viewing on YouTube? Click here to view on Wistia. This new standard included considerations to the inherent strength advantage of ductile iron over its cast iron predecessor. Pipe and Foundry. To determine the appropriate wall thickness, the ability of the manufacturers to produce a consistent pipe wall of a given pipe diameter was weighted as the most important factor.
Primarily, the hoop stress equation was employed to govern wall thickness based on internal pressure. Pipe wall deflection references the ability of the pipe to move from a circularcross-section to an oval configuration under a given stress level generated by the applicable external loads. Also, the more flexible linings available today, such as ceramic epoxy, are capable of handling greater wall deflections, but again, the design is maintained for the most conservative case using cement lined pipe.
Based on the parameters discussed above, the member companies agreed to set a standard of thickness for ductile iron pipe as Class 1 — Class 6. In addition to the established wall thickness design, there were also additional considerations given to the wall thickness which included a 0. The casting tolerance would account for any minor deviations in wall thickness during the manufacture.
The service allowance was included to help mitigate any minor corrosion that may take place in cast iron pipe. Industry experts knew that the design of the stronger ductile iron pipe was extremely conservative and believed that the pipe could be consistently manufactured with a thinner wall. However, many of the folks involved in this decision questioned whether a class 0 pipe would be accepted by end users.
InDIPRA member companies decided to include a pressure class rating system for the following two reasons:. To understand what class of pipe you should specify, you must understand that ductile iron pipe is a flexible conduit unlike its cast iron predecessors.
Because it is a flexible conduit, as is PVC, HDPE and steel conduits, the pipe can deform and re-form to its original shape as forces are applied to, and removed from, the pipe wall.
Two factors to consider when deciding what wall thickness, and therefore correlating pressure or thickness class, for your specific need:. Ductile iron pipe is the only material that considers external loading when determining the wall thickness needed for a specific pipe diameter. All others simply rely on the internal pressure of the fluid.
This tool has many other useful design calculators as well as access to technical information. By utilizing the PE, you can easily input design criteria such as pipe diameter, maximum internal pressure, depth of cover, wheel load and the weight of the soil. Once you input this information, it will yield results that tell you exactly what thickness of pipe and the correlating class of pipe that your application requires.
It will also let you know if the internal pressure or external loading bending stress govern the design. So, if you ask for pipe that is CL50 or better for any of those sizes, you will get pipe that, at its lowest pressure rating, is rated for a minimum PSI.
The easiest thing to do is to determine the wall thickness requirement for your application and then refer to a chart like the one below. Given the conservative nature of ductile iron pipe design, which includes a psi surge allowance and a nominal safety factor, no ductile iron pipe manufactured is designed not to withstand at least psi of water pressure. Well, if you add the psi surge allowance and then multiply that by the safety factor, you will see that even CL ductile iron pipe is designed to hold psi.
Not only has the pipe wall of every piece of pipe been designed to a minimum of at least psi, every pipe that is manufactured is tested to a minimum of psi before leaving the foundry. If you ever need assistance with your pipeline design or have any questions, please contact your local sales representative. I am a graduate of Auburn University War Eagle! My time at McWane Ductile has afforded me the opportunity to provide for my family, learn about an interesting industry which I had no prior knowledge of, all while working alongside the best team in the industry.
Away from work, I, along with my wife Jackie and son Logan, enjoy travelling and attending various sporting events.Soil and Minimum Compactions are shown below:. The type of Installation you choose will be based on a combination of factors such as available backfill materials, depth of fill, and required class of pipe. The American Concrete Pipe Association has PipePac software that can be downloaded free of charge by filling out the registration form at the bottom of the page.
This software will help you analyze different Installation Types to help you decide on the most economical choice. The Direct Design is the design of the pipe in the installed condition.
The magnitude and distribution of the loads are determined, and the physical properties necessary to support those loads are calculated. Q: When should I use Direct Design vs. Indirect Design for concrete pipe? Joints are manufactured with various geometries and tolerances, and therefore the best way to determine the radius you can turn is to contact the manufacturer.
There are also education events throughout the year to share knowledge with people working in the buried infrastructure industry. You find these on our website and under the Education tab. Q: How does one arrange for a plant tour? A: Plant tours are available year round for small parties or large delegations.
Chimney Pipe Buying Guide
Contact the American Concrete Pipe Association, or a local concrete pipe producer to arrange for a tour and information sessions. Return to Top. Design How do I calculate the required class of pipe required for my project? What do the classes of pipe represent? What is a D-Load?
Difference Between Pipe Class & Pipe Schedule
What are standard installations and which type would I use for my project? When should I use Direct Design vs. What is the minimum fill height I can bury a concrete pipe? What is the difference between a trench and embankment installation? What is the maximum flow velocity I can design RCP without cavitation?
Does the American Concrete Pipe Association provide any guidance on designing precast box culverts?
How do I size the culvert required for my project? Why is it important to design concrete pipe to the 0. What is the difference between service life and design life?
What is the service life of concrete pipe? Installation How much of a gap am I allowed between joints? What needs to be considered when transporting and unloading concrete pipe? Specification Where can I find standards pertaining to the manufacture, installation, and testing of concrete pipe and box culverts? Inspection What is an acceptable crack width in a concrete pipe?Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.
We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience. Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server.
If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Pipes - Nominal Wall Thickness Nominal wall thickness of seamless and welded carbon and alloy steel pipes Sponsored Links. Tag Search en: nominal wall thikness pipe.
Privacy We don't collect information from our users. Citation This page can be cited as Engineering ToolBox, Pipes - Nominal Wall Thickness. Modify access date. Scientific Online Calculator. Make Shortcut to Home Screen?To fully understand about pipe class and piping specification you must know basics of the piping.How to Read P&ID Drawing - A Complete Tutorial
Pipe covers a very large part of any process plant. If you look at the Oil Exploration platform, Refinery and Petrochemical complex one thing that catches the attention is a complex network of piping. Piping is used to transport various process materials from one equipment to another. But why? Process Plant is a place where a series of activities are performed in particular ordered to convert raw material into a useful product.
Interconnected pipe and pipe components are used to transport raw material, intermediated product and final product to the desired location. The pipe is a straight pressure tight cylindrical hollow, used in the piping system to transport liquid, gas and sometimes solids.
Different types of pipes used in various design conditions, considering technical and commercial parameters. Based on the way pipe manufacturingPipes are mainly classified into two categories seamless and welded. Welded pipes are further classified based on the method of welding. There are two ways to weld pipe 1st is with filler metal and 2nd is without filler metal.
SAW pipes are further classified as straight seam and spiral seam pipe. Medium diameter straight SAW pipe has single seam whereas large diameter pipe has a two-weld seam.
Piping class or Pipe Class is a document that specifies the type of the components such as a type of pipe, schedule, material, flange ratings, branch types, valve types and valve trim material, gasket and all the other components specific requirements to be used for different fluids under different operating conditions in a plant. Pipe class is developed considering Operating Pressure, temperature and corrosive environment. Pipe class is part of the Piping specification.
Shortcode is used to cover all the information applicable to the given pipe class. This pipe class is also included in the line number so that field construction engineer can easily identify the material required. Check the link for the example of a piping class specification. You can watch this video, where I have explained the above Pipe class in great detail.
Piping Specifications are technical documents that are generated by private companies to address additional requirements applicable to a specific product or application. Piping Components are mechanical elements suitable for joining or assembling into a pressure tight fluid containing piping system.Trying to figure out what kind of piping you need to install your fireplace, stove, or any other hearth appliance can be an intimidating task. In an effort to simplify things for you, we will look at several aspects of the most common types of chimney pipe and explain their uses and applications.
What we have here is a guide to help you, the consumer, become a bit more familiar with chimney pipe. First and foremost, in any installation, you'll want to begin by consulting the owner's manual for your hearth appliance.
Different fireplaces and stoves have varying venting requirements. These requirements involve more than just the kind of pipe you need; it also includes specific information regarding clearances and offsets that must be followed for safe and proper installation. If anything in your manual is unclear or confusing, contact the manufacturer of your appliance directly for clarification. But, if you need further assistance or simply can't get a hold of your manufacturer, feel free to give us a call at or email us at info efireplacestore.
Our NFI certified specialists will be happy to assist you in any way that they can. Class A chimney pipe has many names, often referred to as double-wall chimney pipe, triple-wall chimney pipe, all-fuel pipe, or insulated chimney pipe.
Class A pipe is used to vent high-temperature exhaust released from wood, coal, and oil-burning appliances such as fireplaces, stoves, boilers, and furnaces. Not every venting system requires a Class A pipe, but it is absolutely necessary for use with all wood-burning fireplaces and stoves. Class A chimney pipe is UL-listed, which permits its use with a range of different vent pipe manufactured by other fabricators and an even wider variety of fireplaces, stoves, inserts, and furnaces.
However, it is important to note that you should never mix-and-match different brands of Class A chimney pipe within one chimney system unless specifically allowed by the manufacturer. The different brands of pipe are all distinctly engineered and must be used as a complete system from beginning to end.
Pipe dimension chart (11×17)
If you are looking to extend or redesign your current chimney system, you need to know the make and model of your existing Class A pipe and purchase the same type, if possible. Unfortunately, if your existing make and model of pipe is a discontinued or obsolete brand, you will likely need to rebuild your chimney system from scratch.
Building codes prohibit the use of any adapters not approved by the manufacturer. These adapters are very rare and are usually only offered by a manufacturer to link a very similar discontinued piping system to a currently offered system. When using Class A chimney pipe, it is important to plan or route the vent run wisely to minimize costs and maximize your savings. Class A pipe is usually manufactured with either a stainless steel or galvanized or galvalume outer wall.
When running Class A pipe within a masonry chimney, a chase, an attic, or any enclosure inside the home, it is economically wise to use galvanized pipe. It is highly recommended, if possible, to install your chimney in the interior of your home. Having your chimney system exposed to the outdoors brings with it the risk of a "cold hearth syndrome," which can hinder drafting and produce more creosote.
The need for stainless steel only arises when your pipe will be exposed to the elements. If the galvanized pipe is exposed, it is susceptible to eventual rust and corrosion. This is especially true in coastal areas. If you must use galvanized pipe outside, we urge you to paint your pipe with a high temperature, rust-resistant paint.PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do.
Class numbers are therefore recommended before PN ratings. The piping rating must follow the pressure-temperature rating of the weakest pressure containing item in the system. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro. We don't collect information from our users.
Only emails and answers are saved in our archive.
Cookies are only used in the browser to improve user experience. Some of our calculators and applications let you save application data to your local computer.