Are R-Pipe Gauges the Same as BSPT?

If you’re involved in working with pipes and threads, you might have encountered the term R-Pipe gauges and wondered how they relate to BSPT gauges. Let’s simplify things and clarify this common question.

What Are R-Pipe Gauges?

R-Pipe gauges are tools designed to measure and inspect pipe threads, ensuring they fit correctly and form a tight seal. The "R" in R-Pipe refers to BSPT (British Standard Pipe Taper), meaning that R-Pipe gauges are essentially the same as BSPT gauges when talking about tapered threads.

The Transition from BS 21-1985 to New Standards

Previously, the industry relied on the BS 21-1985 standard to measure pipe threads. However, this standard has become outdated and has been replaced by modern specifications like ISO 7/2-2000 and BS EN 10226-3:2005. While these newer standards are now widely used, some customers still prefer the older BS 21-1985 specification.

Key Differences Between the Standards

Elimination of System A and System B The old BS 21-1985 standard categorized gauges into System A and System B. These distinctions no longer exist in the newer ISO standards, simplifying the selection process.

Changes in Thread Ring Types Under BS 21-1985, taper or conical thread rings were used to check external threads. The newer ISO standards recommend using parallel thread rings to check both taper threads (e.g., Rc) and parallel threads (e.g., Rp).

This shift impacts the way you check pipe threads, making it important to understand which standard you’re working with.

Here are a few tips to ensure you use the correct gauges:

  • Inform Your Supplier TruThread Europe: Specify the type of gauge and standard you need. This avoids any confusion and ensures you get the right tools.
  • Adopt New Standards: Whenever possible, transition to ISO 7/2-2000 or BS EN 10226-3:2005 for more accurate and reliable measurements.

In short, R-Pipe gauges and BSPT gauges are synonymous when referring to tapered threads. While the BS 21-1985 standard is still in limited use, adopting newer standards can lead to better precision and efficiency. Always confirm your specifications with your supplier to ensure optimal performance in your piping projects.