Abbreviated as ‘Pipe Spec”, piping specification is a prepared document listing the specification for the pipes and its components for a specific service. Prepared during the design phase of the project, it also lists additional requirements regarding materials that go beyond the standards.
To be more specific, a pipe spec gives definition and instruction to the following:
- Design – minimum requirements for thermal expansion, allowance rates, and the like.
- Procurement – here we see the list of material requirements that go beyond allowed standards, like heat treatment.
- Fabrication – includes instruction on how the materials should be fabricated, welded, and installed on the piping system. This also talks about painting and cleaning processes.
- Engineering – description on how the designs are to be prepared and how the plant layout should be.
The Piping Specification document is not only used during the construction phase, but is also beneficial for repairs and maintenance works. As the pipe spec has all the information regarding a specific section of the piping system, it is used as a key reference for any changes done on the system.
One thing to note about the pipe spec document is that it is made specifically for a certain section of the plant or building. This means the information on one pipe spec may not apply to another section, making it important to specify which section the pipe spec is for.
Similar to pipe class, pipe specs also use short codes and numbers to provide as much detailed information as it can. Understanding how to read a pipe spec is important for optimal use of the document.
For example, on the Process and Instrument Diagram, the quoted line is 12-FW-1014-1CS1P. This can be deciphered as follows:
- 12 – The line’s nominal pipe size.
- FW – Refers to the contents of the pipe, also known as the service code. For this example, FW stands for Fire Water.
- 1014 – This is the pipeline number, a unique set of numbers allocated to a specific section or run of pipe. This information is placed during the design stage.
- 1CS1P -This is the short-hand reference into the piping specification document for the pipe specification number. It is unique to that document, with the first number normally referring to the system’s pressure rating.
Once the pipe spec number is located, you can then go to the specific page on the document to get the necessary information.
Hope this article helps you understand pipe class and pipe specifications better. If you have any thoughts, feel free to comment down below!