Tubing pressure hoses

Niederdruck-kessel, m. low-pressure boiler, -schlauch, m. low-pressure tubing or hose, niederfallen, v.t. fall down, precipitate, settle. Nieder-frequenzstrom, m. low-frequency current, -gang, m. going down, descent down-stroke (of a piston),... 

CNG dispensing hose uses an impervious inner tube reinforced by a braided over-wrap of stainless steel wire. The inner tube can be teflon or a similar material that is not porous and will not become overly stiff in cold weather. An unusual problem that can occur with high-pressure hose is that if static electricity builds up inside the hose, it may discharge through the hose to the wire reinforcement. When this occurs, a small hole is formed in the inner tube that quickly leads to a leak through the wire reinforcement. Such incidents are rare, but they do occur, caused by the non-conducting properties of the inner tube. There have been no reported incidents of such failures in CNG dispensing hoses. 

The bubble point test is a popular single-point physical integrity test for disc filter membranes based on Eq. (21). A fdter medium is wetted with a liquid, and test gas pressure is slowly raised until a steady stream of bubbles appears from a tube or hose attached to the downstream side of the filter and immersed in water (Fig. 9). The pressure at which the bubbles first appear is recorded as the bubble point and is related to the largest pores in the fdter medium. A pore size can be calculated from Eq. (21) however, it must be realized that the bubble point test does not measure the actual pore size, but only allows correla-... 

Pressure Hoses - Reinforced polytetrafluoroethylene (PTFE) hoses comprised of a PTFE tube and reinforcement, usually in the form of single ply or multi-plies of metal wire braiding, for super atmospheric pressure end uses. 

Weep Test - This is a test to determine the integrity of a high pressure hose. In this procedure (MIL-S-3136, type III and MIL-H-25579) unbraided samples of the tube are pressurized by filling with a specified fuel (70% i-octane + 30% toluene) to a calculated initial pressure. Pressure is incrementally (0.035 MPa) increased until seepage occurs. This pressure is recorded as weep pressure. 

The gas inlet tube e is connected via a pressure hose to a two-way stopcock which connects the system either to an oil-type... 

Since polyamides can meet specification SAE J844 for air-brake hose, coiled tubing is produced for this purpose for use on trucks. Coiled air-brake hose produced from this material has been used on trucks that have traveled over two million miles without a single reported failure. Eligh-pressure hose and fuel lines are also produced from this material. 

For h pour or viscous fluids, particulaily in cold climates, the line from the extractor to the receiver may require a thermally insulated high pressure hose or tubing. The receiver should be placed as close to the extractor as... 

By connecting manometer hoses to both output pressures given by the tube, the pressure difference Ap can be measured directly. The barometric pressure and the fluid temperature are required for the determination of the fluid density. The Pitot-static tube is not a suitable instrument for measuring low velocities. It can be applied in cases where the flow velocity is high... 

Three types of lines are used in fluid power systems pipe (rigid), tubing (semi-rigid), and hoses (flexible). A number of factors are considered when the type of line is selected for a particular application. These factors include the type of fluid, the required system pressure, and the location of the system. For example, heavy pipe might be used for a large, stationary system, but comparatively lightweight tubing must be used in mobile applications. Flexible hose is required in installations where units must be free to move relative to each other. 

If a rubber tube connected to the vacuum source and the system (or manometer) collapses, you ve had it. The system is no longer connected to the vacuum source, and as air from the bleed tube or vapor from the liquid you re distilling fills your distillation setup, the pressure in the system goes up. Occasionally test the vacuum hoses and if they collapse under vacuum, replace them with sturdier hoses that can take it. 

Standard industrial heaters with water or oil have been used extensively with good result. Water-based heaters are available with or without pressurization. With pressurized systems, temperatures up to about 140°C are possible. With pressurized systems, however, special hoses and tubes are necessary, and this will increase the costs for the heating system significantly. 

Elastomeric block polymers of styrene and butadiene or iso-prene and their products of hydrogenation are finding increasing use in a variety of fields.44. Linear and radial block polymers are used extensively in injection molded rubber goods, footwear, pressure sensitive and hot melt adhesives and in mechanical rubber goods such as hose, tubing, cove base, toys, drug sundries, rubber bands, stoppers, erasers, etc. 

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