Testing flow in narrow pipes (think: industrial boilers, chemical reactors, or HVAC ducts under 10cm diameter) demands custom pneumatic probes—standard sizes just won’t fit without disrupting flow. But how do you translate your needs into specs manufacturers can act on? Here’s a step-by-step guide.

Start with the pipe’s critical dimensions:

· Inner diameter (ID): The probe’s tip must be ≤30% of the pipe ID to avoid turbulence. For a 6cm pipe, cap the tip at 1.8cm.

· Bend radius: If the pipe has elbows, calculate the minimum bend radius (e.g., 2x ID for 90° turns) to ensure the probe can reach the test section without scraping.

· Insertion depth: Specify how far the probe needs to extend from the pipe wall—center-stream measurements often require full insertion, but avoid touching the opposite side.

Material matters more than you think:

· For corrosive fluids (acids, seawater), request 316L stainless steel or Hastelloy.

· High-temperature pipes (>200°C) need Inconel tips to resist warping.

· Plastic (PEEK) works for low-pressure, non-corrosive scenarios (e.g., food-grade pipes) and cuts cost by 40%.

Clarify measurement goals:

· Single parameter (e.g., static pressure only) simplifies design.

· Multi-parameter (total pressure + temperature) adds complexity but reduces the number of probes needed.

· Note the flow speed range (e.g., 0.5–10 m/s) to ensure the probe’s frequency response matches.

Don’t skip installation details:

· Threaded vs. flanged mounts: Threaded works for temporary tests; flanged for permanent setups.

· Sealing requirements: Food or pharmaceutical pipes need FDA-approved gaskets (e.g., silicone).

Pro tip: Share a 3D model of your pipe (even a rough sketch) with manufacturers. It avoids miscommunications about bends or obstructions.

Struggling with specs? Drop your pipe ID and fluid type in the comments, and we’ll help draft a sample request.