Ratermann Manufacturing, Inc. Customer Service 1-800-264-7793 y Fax 1-800-264-7797 y Order Online at Web Store www.rmiorder.com 20A-2 Rev: 3/26/20 Selecting the correct hose can improve your process Selecting the correct hose for a particular application is one key element that is often overlooked. Many hose failures are attributed to a mismatch of hose and application. Armed with a little knowledge, it is not difficult to select the best hose for your customers industrial or specialty gas application . Application Questions To select the correct hose, make the following determinations: • Gas or cryogenic • Type of gas/grade (argon, helium, hydrogen, oxygen, etc.) • Required maximum pressure (psig) • Required maximum flow rate (CFH or CFM) • Length of hose (give yourself extra length) • Fitting configuration (1/4” NPT is standard; other fittings available) • Armor casing (yes or no) • Cleaned, capped and bagged (for oxygen service) • Special configuration – CGA nut, hand tight, check valve, etc. Hoses designed for specialty gas applications should not only provide pressure capacity, but also maintain the purity of gas delivered. For this reason, it is not recommended to use rubber type hoses to supply high purity gas. Permeation is the term used to describe how gas molecules pass through the pores of a hose. When gases escape out of a hose, this is called “effusion.” If permeation levels are high, ambient gases can enter into the gas stream through “diffusion,” thereby adding contaminants. To varying degrees, rubber, PTFE and ETFE hoses all permeate gases. The smaller the gas molecule, the higher the rate of permeation. “All metal” hoses utilize a corrugated inner core that features “zero permeation.” One might conclude that “all metal” hoses are the final answer; however, cost, velocity issues and the application will dictate the best choice. PTFE, PTFE hybrids such as “post sintered,” and ETFE thermoplastic hoses maintain pressure capacity while dramatically reducing permeation. Their flexibility and durability are much more appealing than “all metal” hoses when outfitting a high capacity fill plant. It is important to evaluate the requirements of each application and then select the hose that best fits. Selecting the correct hose can maximize gas purity, reduce the risk of contamination and improve a customer’s process. PTFE – Ratermann Mfg. FP Family of Hoses The most popular high-pressure hose in use. Commonly found in fill plants across the country. Durable, flexible, and economically priced. PTFE “Post Sintered” – Ratermann Mfg. FPT Family of Hoses The “post sintered” process re-bakes the PTFE at a controlled time and temper- ature, increasing the wall thickness and tightening the molecular bond of the PTFE, which dramatically reduces effusion and diffusion. Economically priced, very flexible and works well with most gases. Rigid Metal – Ratermann Mfg. PT Family of Rigid Hoses Economically priced, reduced flexibility, best suited for stationary applications. Rigid hoses will eventually crack as they are bent and flexed. All Metal Corrugated Hose – Ratermann Mfg. FPS Family of Hoses All metal hoses utilize a metal corrugated inner core (typically 316 stainless steel or Monel). Metal hoses feature “zero permeation” or “no gas loss,” which is very important in static gas applications. Metal hose is more costly, and is commonly used with helium and hydrogen. Monel inner core is available for corrosive type gases. Pay close attention to dynamic stress and velocity levels (flow rate) as there are limitations with a metal hose. PTFE Hose Hose Type “FP” and “FPT” There are several choices of materials to consider when selecting a hose: Rubber – Inexpensive, high permeation rates, not recommended for high purity applications. Thermoplastic – Ratermann Mfg. TPL Family of Hoses Durable, economical, flexible and features a low permeation rate. Not recommended for oxygen use. Thermoplastic Hose Hose Type “TPL” High Pressure Pigtail Selection Guide Compatibility Excellent 5 Very Good 4 Good 3 Acceptable 2 Not Acceptable N Call us to Help You with Your Gas Hose Needs! Ratermann Hose Style FP / FPT FPT-60P FPS FPS-45P FPS-C TPL Working Pressure (MAWP) 3000/3600 PSIG 6000 PSIG 4250 PSIG 4500 PSIG 3000 PSIG 2750 PSIG Core or Liner PTFE PTFE 316L S.S. 316L S.S. Monel Polyester Gas Connection 1Acetylene 510 4 5 3 3 3 2 Air 346 5 3 3 3 3 2 Argon 580 5 3 3 3 3 2 1Arsine 660 N N N N 3 N Carbon Dioxide 320 5 3 3 3 3 5 Carbon Monoxide 350 4 4 5 5 3 N Chlorine 660 N N N N 4 N Fluorine 679 N N N N 4 N Freon 12 660 5 4 5 5 5 N Helium 580 4 3 5 5 4 2 Hydrogen 350 3 3 4 4 3 N Methane 350 5 4 5 5 5 N Natural Gas 350 3 5 5 5 3 N Nitrogen 580 5 5 3 3 3 2 Nitrous Oxide 326 5 3 3 3 3 N Oxygen 540 5 3 3 3 4 N All Metal Hose Hose Type “FPS” HIGH PRESSURE PIGTAIL SELECTION GUIDE
