Flex-Pression Ltd. 3" x 13' Cryogenic Transfer Hose – LNG-300 Connections

What pressure, flow and temperature is it rated for?

The listing does not provide pressure, flow, or temperature ratings for this hose assembly. Ask the seller for the maximum working pressure, burst pressure rating, and temperature range (-320°F to ambient is typical for LNG/cryogenic hoses, but must be confirmed). Flow capacity on a 3" I.D. hose depends on differential pressure and fluid properties, but operational ratings are what matter for safe service.

What gases is it compatible with, and has it been oxygen cleaned?

This hose was prepared for oxygen service—cleaned, degreased, capped, and bagged per Chart Industries specification, reference No. 191699. The LNG-300 connection standard and corrugated stainless construction are compatible with LNG, liquid nitrogen, liquid argon, and other cryogenic fluids. Oxygen cleaning means it meets CGA G-4.1 standards for oxygen service, but re-use with oxygen after exposure to hydrocarbons or other contaminants would require re-cleaning.

What materials are the wetted parts?

The hose features a stainless steel corrugated core with braided reinforcement, and the LNG-300 couplings are described as brass/SS connections with a 30° cone seal and Teflon gasket groove. The listing does not specify the exact stainless alloy (304L, 316L, or 321 are common for cryogenic service) or confirm whether coupling bodies are brass, stainless, or a combination—ask the seller for material certifications if this matters for your fluid compatibility or pressure class.

What should I inspect before putting it into service?

Verify the dust caps are intact and the interior remains clean if you're relying on the oxygen-service preparation; any contamination voids that work. Flex the hose gently and inspect the corrugated core through the braid for kinks, flat spots, or damage from storage or handling—cryogenic hoses lose flexibility and develop leak paths when kinked. Check both LNG-300 coupling faces for dings, scratches, or distortion on the 30° sealing cone, inspect Teflon gasket grooves, and confirm threads are clean and undamaged. Pressure-test to your system's working pressure with an inert gas before introducing cryogenic fluid.