NACE RP & SP Difference

Where is the classification coming from? Is it the file name or a header in the document? Do you have a NACE represetative in your area? Are these original documents or some copies from somewhere..

Why are you confused when the content is the same? Seems the only difference is SP and RP. Relax and get in contact with NACE via their website. They should be able to help you very quick. www.nace.org

The change I observed in the header of the document.RP 0472 is too old (2000 edition) and SP 0472 is (2010 edition)?When this change came?Is it a typing mistake or NACE purposely changed?Any idea?

Looks like its a revision then. So it could well have been a typo or it is something like Standard Process compared to Revised Process (only it is the other way around)

In order to find out I would ask NACE.

RP was replaced by SP in 2008

From http://www.techstreet.com/standards/nace/rp0472_2005?product_id=1262466

I don't know why people don't make statements about differences like this. I often spend ages trying to figure out what the difference is between two components (electronic) with similar names but one letter changed in the suffix.

Previous to RP 0472 was QP 0472 and next to SP 0472 will be TP 0472. My guess.

NACE publishes three classes of standards: Standard Practice, Standard Test Method, and Standard Material Requirements. Until 2006, NACE published Standard Recommended Practices, known by the acronym "RP." The word "recommended" was removed because of frequent misunderstandings of its meaning, and that type of standard became simply "standard practice." All of these are standards; they simply have different purposes, and the extra words are used to clarify those purposes. we call them: SP, TM, MR. Standard Practice: Methods of selection, design, installation, or operation of a material or system when corrosion is a factor. This class of standard may provide details of construction of a corrosion-control system; methods of treating the surface of materials to reduce requirements for using corrosion-control devices; criteria for the proper operation and maintenance of a corrosion-control system; methods for the proper use of corrosion-control techniques; procedures for increasing the effectiveness, safety, and economic benefits of an installation or system; procedures for proper use of an installed corrosion-control system to prevent its deterioration; or other practices requiring a description of techniques or control parameters for a system. Test Method: Tests related to corrosion prevention and control. This class of standard may give the method of conducting tests of any type to ascertain the characteristics of a material, design, or operation. TMs shall not include acceptance or performance criteria. These criteria may be covered in SPs or MRs. Material Requirements: Standards that define the necessary or recommended characteristics of a material when corrosion is a factor in the selection, application, and maintenance of the material. This class of standard may include chemical composition of the material, its mechanical properties, its physical properties, material selection, and other aspects of its manufacture and application. Good luck