Bruce, Thanks for responding.
The primer is solvent based grey, oil based hazard classification - Class 3.
Customer says only one paint ever will be used in the new system, but we've all heard that line before.
Hadn't considered the alcohol flushing system.
Thanks again for your comments. Glenn
-----Original Message-----
From: Bruce Bullough [mailto:bbullough@sebesta.com]
Sent: Tuesday, October 16, 2001 10:38 AM
To: 'PipingDesign@yahoogroups.com'
Subject: RE: [PipingDesign] Paint Pipelines
When you say "primer" what _exactly_ do you mean? Do you mean the solvent base or white- (or other color) pigmented primer paint?
If it's solvent base (water/latex or organic/turpentine - flammables) then the issues will be assuring sufficent velocity, temperature control, and static control (static control limits the velocity). regardless, backflushing is strongly recommended; whether you opt to pig or not, piggable design is also suggested (long radius elbows, etc.). If the line will be used for both latex and flammable solvent, unless the user is willing to scrap out some quantity (due to emulsions, etc.c, forming), pigging or a good alcohol flush capability is also worth consiering (use a tank and a separator, and yu can recycle most of the alcohol several times).
If it's pigmented paint, then consider all the above plus design for periodic disassembly. As the pigment finds the spaces to settle in, it most certanly will, and then it dries, contaminating future "batches" - assuming that this is a higher quality paint. Pigments have a way of having a major effect in very small concentrations. I know of paint mfrs who schedule increasingly dark or "strong" colors in order to reduce the frequency of disassembly for thorough cleaning. A little red pigment can influence 10s of volume changes of lighter paint.
Also, if flammable solvents are transported, be aware of B31.3 (process piping guidelines) and flammable service ratings of devices, even valves.
For the distance, make sure that your pump is designed for the distance and viscosity. You might need a booster pump at some point.
... Bruce D. Bullough ...
Sebesta Blomberg & Associates
2381 Rosegate
Roseville, MN 55113
651-634-7344 (office)
651-634-7400 (FAX)
www.sebesta.com
-----Original Message-----
From: Glenn Dillon [mailto:glenn.dillon@task-consultancy.co.nz]
Sent: Monday, October 15, 2001 3:01 PM
To: <a href="/group/PipingDesign/post?postID=G1W9Nrh9Nlx8whQRsbwsytN08HWRbFD3-T5_OEKZr9kt5F9iSUOPC0Du4zuvO1gga0sMv4cRux5PMsApVQVpPK_EEw">PipingDesign@yahoogroups.com</a>
Subject: [PipingDesign] Paint Pipelines
Forum Members,
I am seeking advice on how to design piping for paint transfer. The application involves pumping primer from bulk tanks to process and back, a distance about 100 metres each way. Assumptions are to use TP 316 or TP 2205 pipe material, flow requires either 1 1/2 or 2 inch bore. Has anyone experience with piping paint over this distance? Are there any pitfalls to watch for, like contamination issues? Is CIP cleaning recommended by back flushing or pig?
I look forward to receiving your comments.
Glenn
Tel, (09) 520 2360
Fax, (09) 520 2363
Email: <a href="/group/PipingDesign/post?postID=2L1UGX0YpblgvTsEJPqURj6Dy4VBooM7kcU-m08vdI4hRPKqf_BQuMZZ9hFomWY1vnack2H7Y5p8-4rZfFUpwlh1Hkpryy4cYw">glenn.dillon@task-consultancy.co.nz</a>
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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Mon Oct 15 22:26:00 2001
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