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Metal Hose & Braid $8.00 METAL HOSE & BRAID APPLICATION & DESIGN GUIDE SEE FLEXIBLE PIPE LOOP CATALOG 2315 W. HUBBARD ST. • CHICAGO, IL 60612 • 800-533-1024 • 312-738-3588 • FAX 312-421-6327 How to Order Flexicraft Hose Assemblies Please provide the following information, or choose a standard connector (pg. 19 - 21): 1. Size of Hose: Nominal Diameter 2. System Application: Flowing Media, Special Requirements 3. Length of Hose Assembly: Overall (End to End) 4. Type of Hose: Material(s) of Construction, Any Corrosive Conditions 5. Fittings: Size, Type, Alloy Each End 6. Pressure or Vacuum: Internal, External 7. Temperature: Operating, Ambient 8. Movement: Static or Intermittent, Direction, Amount 9. Flow Rate: Liner Considerations 10. Special Testing Requirements: Additional Requests This guide provides additional information on the details of choosing hose for a given application. However, with the above information our engineers can choose a hose right for your needs. Flexicraft has been supplying industry with quality piping products for over 40 years. Our reputation for superior products and technical support sets us apart from our competition. In addition to non-metallic expansion joints, Flexicraft is a supplier of metallic expansion joints, braided hose, expansion loops, pulsation dampeners, and other specialty piping products using bellows technologies. Hosecraft USA is a division of Flexicraft and supplies every type and style of industrial hose. For more information or to order, Contact us at: 800-533-1024 • (312) 738-3588 800-584-4168 • (312) 229-7550 www.flexicraft.com www.hosecraftusa.com or contact the representative in your area - see back cover. www.flexicraft.com 3 Table Of Contents Corrugated Metal Hose .................................... page 5 Selection Criteria .......................................... page 6 Classification of Motions ................................. pages 7-8 Guide to Specification Table Headings ....................... page 9 Max Design Conditions - SB1 & SB2 Braided Metal Hose ........ page 10 Max Design Conditions - SB3 High Pressure Braided Metal Hose .page 11 Max Design Conditions - SU1 Unbraided Metal Hose .......... page 12 Max Design Conditions - BB1 & BB2 Braided Bronze Hose ....... page 13 Live Hose Length - For Degree of Bend ....................... page 14 Live Hose Length - For Offset Motion ......................... page 15 Hose Fitting Dimensions ................................... page 16 Hose Fitting Illustrations .................................... page 17 Installation Instructions .................................... page 18 Standard Flexible Connectors .......................... pages 19-21 Terms and Conditions ..................................... page 22 4 www.flexicraft.com Corrugated Metal Hose Flexible metal hose is a versatile tool for the STANDARD CONSTRUCTION & DESIGN designer which provides connections where rigid connectors are impossible or impractical. It offers A. Inner Corrugated Hose: many advantages, such as strength and corrosion/ Type 304, 321 or 316 Stainless Steel temperature resistance. Metal hose absorbs ther- Bronze mal growth, controls vibration and noise, connects (Optional Material available) misaligned piping, and joins parts of machinery. When unbraided corrugated metal hose is subject- B. Outer Braid: Type 304 Stainless Steel ed to high internal pressure the hose is elongated Bronze beyond its ability to recover. The corrugations are stretched out of shape, and the flexibility of the hose (Optional Material available) is impaired. It is therefore necessary to equip the hose with a device which can flex with the hose and C. End Fittings: See pages 16 and 17. prevent elongation under internal pressure. The outer braid is just such a device. The braid consists of a tubular sheath of metal wires woven in a basket weave fashion. It is made to fit snugly over the hose, and is fastened to the ends of the hose. The braid is designed to be strong enough to withstand elongation for the full pressure rating of the hose. The braid alloy is usually similar to that of the hose with which it is used, but may be different for reasons of strength, corrosion resis- tance, etc. METAL HOSE TERMINOLOGY TYPICAL ASSEMBLY www.flexicraft.com 5 Selection Criteria SIZE MOVEMENT The size of flexible metal hose is expressed as a nominal Flexible metal hose is generally used in four types of diameter. The existing piping will normally dictate the size applications: of the metal hose for a particular application. However, 1. To correct problems of misalignment flow rate, velocity and pressure drop considerations may 2. To provide flexibility in manual handling operations also influence the selection of the hose size. 3. To compensate for intermittent or constant movement SYSTEM APPLICATION 4. To absorb vibration In all of these types, careful hose selection, design of The type of media being conveyed is an important consid- the assembly, and installation are important for optimal eration in the selection process. Metal hose is subject to service life. The flexibility of a hose is determined by its corrosion by both the material flowing through it and the mechanical design and the inherent flexibility of its mate- outside environment. For almost all applications, a metal rial. Specific information and data about Flexicraft hose hose can be selected that is resistant to the intended motions are found on subsequent pages. media. Since metal hose is a thin-walled product, it will not have the same total life as heavier walled tube or pipe of the same material. FLOW VELOCITY Where flow is abrasive or velocity is greater than 150 END FITTINGS ft./sec. gas or 75 ft./sec. liquid, a flexible metal liner of fully interlocked hose should be used. When the hose is The many uses of corrugated, flexible metal hose are installed in a bent condition, the allowable velocity should complemented by the comprehensive range of end fit- be reduced 50% for a 90° bend, 25% for a 45° bend. tings that are available. Such end fittings may be male or female pipe threads, unions, flanges, flared tube fit- tings, or other specially designed connectors. End fittings TESTING are attached by welding, silver brazing, soldering, and Leak test and dimensional testing are performed on all mechanical means, depending on the type of hose and hoses shipped. Upon request, mass spectrometer and alloy. Many of these common types of end fittings are liquid penetration testing can be performed. Material test shown on pages 16 and 17. We will make or adapt any reports are available upon request. type fitting to our hose. OTHER CONSIDERATIONS PRESSURE Due to the corrugations, an increased pressure drop can The nominal pressure ratings of flexible metal hose varies be expected with the metal hose. A rule of thumb is the according to type, material and size. Specific pressure pressure drop triples compared to piping. If this is critical ratings for each type of flexible metal hose are found in to your application, additional information can be provided each section of the catalog. Under actual working condi- by the factory. tions, pressure is affected by many other factors such as temperature, pulsating or shock conditions, and bending stresses. Page 9 explains how such factors specifically affect the properties of corrugated metal hose. Also, review the “Temperature Correction Factor Table” on page 9 for adjusting pressure ratings at operating tem- peratures higher that 70° F. TEMPERATURE The physical properties of any material varies with tem- perature. Limits for operating temperature are affected by the working pressure, the type of media being conveyed and the nature of the application. By careful selection of material, it is possible to provide flexible metal hose for a wide range of operating temperatures. The choice of hose type, metal alloy, end fittings and method of fitting attachment determines the temperature limit. 6 www.flexicraft.com Classification Of Motions RANDOM MOTION FORMULA: L = √6RT + T2 Such motion is non-predictable and may occur from the 2 2 manual handling of a hose assembly. Care must be Lp = √L - T taken to prevent over bending of the hose and to avoid external abrading of the wire braid. L = Live Hose Length (inches) Lp = Projected Live Hose Length (inches) ANGULAR MOTION R = Minimum Centerline Bend Radius (inches) This type of motion occurs when one end of a hose T = Offset Motion to one side of assembly is deflected in a simple bend with the ends not Centerline (inches) remaining parallel. (See values on Maximum Design Conditions, page 10.) Note 1: When the offset motion occurs to both sides of the hose centerline, use total travel in the formula; i.e. 2 times “T”. L θ Note 2: The offset distance “T” for constant flexing R should never exceed 25% of the centerline bend radius “R”. Note 3: If the difference between “L” and “Lp” is significant, exercise care at installation to avoid stress on hose and braid at the maximum offset distance. q FORMULA: L = πR 180 L = Live Hose Length (inches) AXIAL MOTION π = 3.1416 This type of motion occurs when there is extension or R = Minimum Centerline Bend compression of the hose along its longitudinal axis. This Radius for constant flexing (inches) motion is restricted to unbraided corrugated hose only q = Angular Deflection (degrees) and is limited to small movements, low pressures such as exhaust gas venting to atmosphere. (See values on Maximum Design Conditions, page 10.) (Bellows Type Expansion Joints and Expansion Loops are specifically designed for this
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