Yes, black iron pipes can be used for transporting certain types of water, but there is a very important distinction: they are never used for potable (drinking) water.
Understanding Black Iron Pipe Use with Water
Black iron pipe is a type of steel pipe that is typically used for transporting natural gas or propane. However, as the reference indicates, it can also be found transporting water in some applications.
A key characteristic of black iron pipe is its susceptibility to corrosion:
- Black iron pipes can still rust.
This rusting is the primary reason for its limitation, especially concerning water meant for consumption.
The Critical Issue: Potable Water Safety
While black iron pipes may be used for non-potable water systems (like hydronic heating or irrigation where water quality for drinking is not a concern), they are strictly avoided for drinking water supplies.
According to the provided information:
- Even though they are still sometimes used to transport water, they are never used for potable water as the corrosion in the metal will mix rust with drinking water.
This means that over time, rust particles and other corrosion byproducts from the pipe material will leach into the water flowing through it.
Why Rust is a Problem for Drinking Water
The presence of rust in drinking water can lead to several issues:
- Water Quality: It can cause discoloration (brown or red water) and metallic taste.
- Health Concerns: While iron itself is a necessary mineral, excess amounts or the form of iron present in rust can be undesirable and potentially problematic in high concentrations or over long periods.
- System Issues: Rust particles can build up, potentially clogging filters, aerators, and even pipes themselves.
Summary of Black Iron Pipe & Water Usage
Here's a quick look at the suitability based on water type:
| Feature | Non-Potable Water | Potable (Drinking) Water |
|---|---|---|
| Suitability | Sometimes used | NEVER USED |
| Reasoning | Corrosion acceptable | Corrosion contaminates |
| Rust Potential | High | High |
| Water Quality | Not critical | Critical |
In conclusion, while black iron pipes might be encountered in older systems transporting non-potable water or used in specific industrial/heating applications, their tendency to rust makes them unsuitable and unsafe for any system delivering water intended for drinking or cooking. Modern plumbing codes and practices universally prohibit their use for potable water supply lines.
