painting guide for ammonia Pipe

[dolce]

Hi all
Can any one provide me painting guide for ammonia Pipe ?
Thanks

[Brian_UK]

It's the wonder of Google....

http://www.pipelabels.com/iiar-guidelines.html

[US Iceman]

Most of the colors you will find for the piping can be a mixture of many different standards. Some will want all the ammonia piping painted one color since it's considered a hazardous fluid. Some refrigeration companies may have specific colors they use, which are acceptable to the owner also.

All of the pipe should should have the pipe labels like Brian provided a link to, and, the valves should have unique tag numbers for identification by operating personnel.

Another issue is: pipe surface preparation. Paint may not adhere well to the mill scale on the pipe so you need to decide how to clean the piping so that the paint will fully adhere to it. Also make sure the paint thickness is sufficient ("x" mills thick of dry film thickness).

[gwapa]

For pipe surface preparation I recomend to use a paint as a base whith Zn .Normaly these base is ocher.
Then one hand of epoxy pain light color and another dark color
It is just to be sure that the worker cuver very well all the surface of the pipe
Gwapa

[samiam]

Hi,

Also search Pipe Markets - you should find some PDF that you can download for reference.

[brian_chapin]

I've found that a coat of 2-part white expoxy (like Macropoxy HS or equivalent) and a topcoat of High Solids Polyurethane (in your desired color) hold up really well. It's essentially the same painting scheme as many outdoor water towers in the US.

In our case we use a safety orange polyurethane topcoat. It makes damage to the paint easy to spot because the underlying white epoxy shows up really well.

We've used this on condenser piping, compressor discharge, -60f liquid lines and ice machines with great success. It has held up on two ice mahcines for 3 years now and they go through freeze-thaw cycles every 25 minutes.

As always - the time you spend on preparing your surface will greatly affect how long the paint adheres. On the ice machines we used glass-bead blasting. Macropoxy also makes a primer that we've successfully used on pitted/flash-rusted pipe. So far that has held up well too.

[la461]

we have always used:
Discharge-red
intermediate-yellow
high pressure liq- orange
purger foul gas line-orange with black rings every 3'
low side blue
water-green
receiver- white with 4'' orange band
king valve- red and labeled
vent piping-black. We have been using colored jacketing for the low and intermediate insulated lines and tanks. make for a nice looking engine room.