Hello,,

I joined this forum looking for some knowledge on different issues.
I am kind of new in the power plant business, I am currently working with a turn key contractor.

I didn't knew where exactly to ask my question so I wil put it here in this thread in case a moderator knows a better place please move it.

During the final works of the power plants where I am involved I have always wondered waht kind of standard exist to mark the flow and the media on piping. We often just print black stickers flow arrows and paint the piping with a RAL code tat we assigned. I want to know if there is a more specific way of doing it.
I just saw a video animation from MAN that showed an ID and flow that I have never seen. I was wondering if sowmone knows.

Thanks in advance

Sorry for my English

Piping.jpg

Hello, A more specific method of labeling is based on ANSI/ASME Codes. Have you heard of ANSI and ASME A13.1 Pipe Labeling standards? This is the proper way to label piping in a power plant or any industrial area.
Pipe labels in the U.S. should conform to ANSI / ASME joint standard A13.1. The most recent update to this code was published in 2007, and introduced a new color scheme. In addition to specifying colors for pipe labels, the code specifies standards for label size and placement.
Pipe labels should indicate both the contents of the pipe and its direction of flow. Arrows at one or both ends indicate flow; the contents are indicated by text and by a standard color scheme.

The current version of the ANSI / ASME code uses a color scheme with six standard color combinations, and four user-defined combinations, as shown in the table to the right. The colors are based on the contents of the pipe; in general, the most hazardous feature of the contents should determine the colors used. For instance, a highly-toxic mixture that was also somewhat combustible would be labeled with black text on an orange background.

Previous editions of the pipe-labeling code used a four-color scheme. The 2007 code applies only to new facilities; new labels in existing facilities should conform to the label scheme already in use to avoid confusion.

Also new to the 2007 edition is the specification of exact colors for pipe labels. Labels should use the safety colors listed in ANSI Z535.1.
Pipe markers should be positioned so that they can be easily seen from the normal angle of approach—for instance, below the centerline of the pipe if the pipe is overhead, and above the centerline if the pipe is below eye level. Labels are required at the following locations:

• Adjacent to all valves and flanges
• Adjacent to all changes of direction
• On both sides of wall or floor penetrations
• At regular intervals on straight runs (50' is the acceptable maximum spacing, but closer spacing might be necessary for visibility.)

I hope this information will steer you in the right direction.
thanks
Regards,
Brian

Attached Images

	ansi color code.gif (10.6 KB, 7 views)
	ASME Power Plant Label.jpg (14.9 KB, 5 views)