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How To Identify Correct Thread Size For Pipe?

National Pipe Threads (NPT)

The physical dimensions of a Pipe are referred by the size of die, but standards of plumbing industry vary from the actual size and proportion of the Pipe. You should be conscious in the measuring of the pipe because mostly it can misguide you to choose the wrong material pipe. The “pipe thread size” as shown in column 3 is based on the inside of the pipe and measure on the value in the table. You must measure the outside diameter of each pipe for the actual identification of the size of the pipe. For example, there is an outside diameter of 3/4″ NPT pipe thread is 1.050 inches. Threads per inch (TPI) are defined for each thread size. There are 14 threads per inch in the 3/4″ NPT pipe thread. For definite classification of the thread, there is need of both the TPI (threads per inch) and OD (outside diameter) of the thread because several sizes have the same TPI.

Male threads: The significant portion of the thread should be measured from the outside diameter at “A”; in column 1 or 2 of chart find figure nearest this dimension. Your nominal pipe thread size will be the dimension in column 3

Female Threads: Top diameter of thread at “B” should be measured; In column 1 or 2 of chart find figure nearest this dimension. Your nominal pipe thread size will be the dimension in column 3

The American National Standard for pipe has specified all pipe thread types used in plumbing as accredited by the American National Standards Institute (ANSI).
NPT pipe thread is tapered threads. For general purposes usage, these are the most common threads. NPT threads are designed at an angle of 60-degree thread angle in the NPT threads, and they are used for joining and sealing the pipe. The tapered thread is 3/4″ over one foot of length. At the end of the pipe tapered threads are deeper and the further they are from the end of the pipe and are increasingly shallower.

The pipe is only allowed by the taper on the pipe to screw inside the fitting until it is forced to stop because of the taper. The ANSI standard specifies the distance the pipe can be screwed into the fitting. The threads may have slight spaces between the pipe and fitting after tightening with a wrench due to which a leak can be caused so for ensured about the gaps being all filled a pipe sealant must be used. Threads are also tapered by the Dry-seal thread (NPTF). When the usage is such that the pipe sealing compounds may malfunction due to higher heat or pressure than standard NPT threads can withstand at that point, NPTF threads are used.

When tightened with a wrench the threads are designed to mechanically seal, that allows crushing the threads. The joining of pipe and fitting without sealants is allowed by it. If sealants such as PTFE tape or suitable pipe joint compounds are used, then the NPT and NPTF threads can be interchanged. None of the other thread standards are fully interchangeable (GHT, NST, BSPT, NPSI, etc.). “FPT” or “FIP” can be the designation for Female NPT threads and “MPT” or “MIP” can be the designation for male NPT threads. There are straight threads in National Standard Free-Fitting Straight Mechanical Pipe Threads (NPSM) which are only used for joining.

There is need of a washer or gasket to seal this type of threaded connection. The usage of these three thread types is also very common in the plumbing industry. There are coarse threads in the Garden Hose Thread (GHT) and the Fire Hose Thread (NST). A gasket or washer is used to make t and is used mainly for attaching (joining) hoses to valves quickly, without the usage of a wrench. There is a 55-degree thread angle in the British Standard Taper Pipe Thread (BSPT) (NPT are 60 degrees), and it has a standard thread for joining steel pipes which are its international usage.

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The work of a plumber is to repair, re-install, and maintain the pipes and pipelines of drainage systems that lead to your appliances and other fixtures. Plumbers are appointed for both residential and commercial purposes some on the basis of needs and some on contract basis. The role of plumber is to fix drainage pipes and performing satisfactory pipe fixtures. A plumber should be skill full and highly trained to delivery satisfactory service for their customers and to fix their issues completely.


Satisfactory manual dexterity is one of the most essential physical requirements a plumber should have. As a plumber needs to carry heavy holds he must have the capability to hold heavy objects firmly and steadily. Holding objects may include tools and piece of pipe. A skilled plumber should know how to smartly manipulate his fingers and arms and how to synchronize his both arms. He should a clear vision and a good eye sight so that he could easily detect problems and can analyze the condition perfectly.


A plumber should know some of the basic mathematical functions as he always needs to take calculations and measurements. It is preferred that a plumber should be aware of basic geometrical and algebraic knowledge to make its calculation even precise. Requirement gathering is another very important factor that a plumber should be good at. Communicating with people and understanding their issue correctly is one of the most important ability a plumber should posses and he should know how to deal and interact with the customer.


A plumber should be good at analyzing and encountering the exact problem. After detection he should make precise calculation and reasoning that how he will solve the issues. What principles he will be going to adopt and how much time he will be going consume. There are various factors on which a plumbers reasoning should depend.


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How CPVC Works and Why It Fails

cpvc pipesChlorinated Polyvinyl chloride (CPVC) is one of the most commonly used manufacturing element for pipes and relative accessory. CPVC relative production includes water pipes, sprinklers, heat transfer application etc.

In comparison with metal piping products CPVC products are cost efficient and user friendly in terms of installation. The thermoplastic (CPVC) was originally invented in 1970s. Since birth CPVC has been enhancing its popularity & adoption in commercial & residential buildings. Over the past few years not only has its growth but piping failures causing damage have also increased. Proper understanding of material & Implementation methods including pipes & fitting is a must known for each consumer in order to prevent or recover these numerous damages.

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Domestic Pluming and Efficient Heating Systems

If you were looking for some information about domestic plumbing but do not have the mood to read a very detailed and time consuming article, then let me tell you that you are at a very right place as here you will be able to explore and discover some facts and figures about domestic plumbing all encapsulated in just an info-graphic that requires less time and is very easy to understand.

This Info-graphic that we have shared with you down below will help you understand about effective heating systems. One thing that must be paid due attention towards is that one should inspect his residence’s heating and plumbing system on regular basis because it saves one from having to face some unwanted situations. This frequent checkup on the plumbing system plays a very important role in saving you from having to get some very expensive repairs done. In return you will be able to save much of your money by not having to spend it on repairs that you would be preventing from doing this regular checkup, therefore this becomes very mandatory that you never take it easy, rather it is something that you must always be doing and should also teach others to do the same so that they too can help themselves from saving from having to face situations as mentioned above.

The other thing that this check would do for you is that you will be able to have an idea as to which plumbing area or part needs some immediate fixtures and the other thing that you will be able to do by following the above mentioned practice is that you can keep your plumbing system up to date.

Plumbing happens to be something very complex and as we all know that it is one of the most basic needs of ours in this modern day and age, therefore should never be heedless of the fact that plumbing be always free from all potential break ups.

Find the Info-graphic below and get an insight of the above mentioned factors.

T-Plumbing-InfographicsIf you further wish to enhance your knowledge of plumbing then we suggest that you keep visiting us on constant basis as we are updating some very useful information.



Mostly Commonly Used Pipes Worldwide

Steel pipes and fittings are used in all around the world for different purposes and applications. There are two kinds of Steel Pipes which are most common worldwide. Those two types are: 

  1. Carbon Steel Pipes
  2. Stainless Steel Pipes. 

Carbon steel pipes are also used for the plumbing purposes by different mechanical contractors and home builders. To make the pipes strong and perform better, pipe companies use material with such a composition that the pipes don’t get on rust quickly so that they could last longer. Steel pipes are used for drinking water supply as well as for water flow in the sea. 

Pan China manufactures steel Pipes and fittings with a special quality thread on it known as Rolled thread. The threading on the Pipe is done in such a way that the life of the pipe last longer and it strongly get connected with other pipes and create a strong joint between them.



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