corrosive water pipe
corrosive water pipe
(OP)
Hi,
I have installed galvanize (medium type) pipe in office building. Within 3 months most part of pipe leaking. I cut them apart, found lots of sediment and corrosive cavity inside pipe. Finally, I get water sample and analyze it with result:
- Mg : 14.1 miligram / liter
- Ca : 47.3 miligram / liter
- Cl : 59.4 miligram / liter
- SO4 : 93.9 miligram / liter
- pH : 7.5
Right now We are not sure wheter the problem is on pipe's quality or the polute water causing such damage.
Any idea/ advise about this?
Thanks
I have installed galvanize (medium type) pipe in office building. Within 3 months most part of pipe leaking. I cut them apart, found lots of sediment and corrosive cavity inside pipe. Finally, I get water sample and analyze it with result:
- Mg : 14.1 miligram / liter
- Ca : 47.3 miligram / liter
- Cl : 59.4 miligram / liter
- SO4 : 93.9 miligram / liter
- pH : 7.5
Right now We are not sure wheter the problem is on pipe's quality or the polute water causing such damage.
Any idea/ advise about this?
Thanks





RE: corrosive water pipe
Your descriptions suggests 'all-over' corrosion indicating that galvanized pipe is not compatible with the water. Any weaknesses (poor weld quality) would show accelerated attack, as would pipe next to dissimilar metals such as brass valves.
Can you do any treatment of the water (raise pH to 8.5, add 2 ppm orthophosphate)? Also, verify that dielectric unions weren't omitted.
RE: corrosive water pipe
If you want to look further into the water, you need a complete water analysis.
The water quality parameters that you should obtain for a project are the basic drinking water quality parameters.
Most labs sell a Basic Water Quality Chemistry Package that contains:
pH
Conductivity and
Corrosion Index
Total Dissolved Solids
Total Suspended Solids
Total Coliform
Alkalinity
Iron, Manganese,
Copper,
Sodium
Calcium,
Magnesium ,
Potassium,
Zinc
Nitrate and Nitrite
Chloride,
Sulfate,
Chlorine
Total Hardness
The labs do this complete package for less than $100.
Maybe this old thread will help:
http://www.eng-tips.com/viewthread.cfm?qid=80889
RE: corrosive water pipe
Actually I would like to know which chemical really damage galvanized pipe. and find a device to help reduce its volume so I dont have to pour any chemical.
RE: corrosive water pipe
Suggest you contact a water conditioning expert such as someone from firms such as Betz, Chemtreat, or Nalco for further assistance.
RE: corrosive water pipe
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: corrosive water pipe