Ask Our Tech Expert: What is the Installation Gap (IG), and Why is it So Important?
At PSI, we believe that precision is the cornerstone of efficiency—and sustainability—in every powder processing system. The Installation Gap (IG) is the small, carefully calibrated space between the spigot heads when installing your BFM® fitting system. Unlike traditional “cut and fit” clamped systems, BFM® fittings offer set-length connectors that deliver consistent, reliable performance. A correct IG not only ensures a dust-tight seal but also minimizes waste, reduces energy consumption, and extends the service life of your equipment, making your operation more sustainable over the long haul.
Why is the Installation Gap So Important?
Understanding the Installation Gap goes beyond simple measurements—it’s about laying the foundation for a resilient and energy-efficient system.
The initial installation of a BFM® fitting system requires more planning than conventional clamped systems. Standard connectors often rely on rough estimations, leaving room for error that can vary from one installer to the next. Tight clamping might cause tearing or restrict product flow, while a loose fit demands frequent adjustment and incurs downtime. In contrast, the BFM® system uses set-length connectors that rely on the correct IG to deliver optimal performance. With the IG precisely calibrated, your installation benefits from a consistent, robust seal that minimizes leaks and ensures that the connector performs flawlessly over the long term.
What Determines the Installation Gap?
Several factors influence the ideal IG:
- Connector Length (CL): The IG is always set slightly shorter than the connector’s overall length.
- Application Needs: A simple rule of thumb for stationary setups with no offset is to deduct 10mm from the connector length. However, if your application involves movement, you’ll need a smaller IG for necessary slack.
Operational Demands: Factors like offsets and movement should always be considered to prevent stress on the fitting during operation.
Always Use the BFM® IG Calculator
To ensure accuracy every time, we strongly recommend using the BFM® IG Calculator. This downloadable app—available on the BFM® fitting website, Google Play, and the Apple App Store—takes the guesswork out of your installation. It even offers guidance on trimming spigot tails when space is limited (we recommend leaving at least 15mm on the tail for proper heat sinking during welding).
Stay tuned for Part 2 of our series, where we’ll dive into measuring and installing your BFM® fittings to achieve the perfect Installation Gap.
