Double Extra Heavy (XXH) and Double Extra Strong (XXS) are pipe designations, referring to their wall thickness, often considered equivalent in the pipe industry. The terminology can vary depending on the standards followed. Both types have extremely thick walls for greater pressure handling capacities, making them ideal for high-pressure applications. While presenting improved corrosion resistance, these pipe schedules come with increased weight, posing challenges in installation. They are less commonly in demand and may not be easily available. Additionally, their production involves more material, leading to a relatively higher cost compared to standard pipes. However, specifics can differ by manufacturers, necessitating verification from product specifications.
| Comparison Point | XXH | XXS |
| Meaning | Double Extra Heavy (Denomination can vary depending upon the standards followed) | Double Extra Strong (Denomination can vary depending upon the standards followed) |
| Wall Thickness | Thicker than SCH 160 but not as thick as XXS | Thicker than XXH; the thickest among all schedules |
| Pressure Rating | High pressure rating | Highest pressure rating |
| Common Usage | High-pressure and high-temperature applications | Extremely high-pressure applications |
| Pipe Material | Typically carbon steel or stainless steel | Typically carbon steel or stainless steel |
| Nominal Pipe Size (NPS) | Available in a wide range of sizes | Available in limited sizes |
| Application Industries | Oil and gas, chemical, power plants | Specialized industries requiring extreme pressure |
| Availability | Widely available | Less commonly available |
| Weight | Heavier due to thicker walls | Heaviest due to the thickest walls |
| Cost | Expensive | More expensive than XXH due to thicker walls |
xxh vs xxs pipe video
