North American 8773 Braided Flexible Connections

Transcription

1 Combustion North American 8773 Braided Flexible Connections Bulletin Flexible braided hoses for gas, oil, steam, compressed air and oxygen service are ideal for applications requiring a high degree of flexibility with tightness and protection against bursting. hey are used in piping systems to neutralize problems caused by vibration, thermal expansion, piping alignment and to accommodate motion hoses are selected for use to accommodate angular, axial, offset, radial and random motions. Braided hoses are not to be compressed or stretched, select a hose long enough to allow proper flexing when accommodating axial movements. hey are capable of handling high working pressures. he maximum working pressure is determined by the service temperature. Standard 8773 flexible hoses are for use up to 750 degree F temperature service H (High emp Hoses), are available for use up to 1000 degree F temperature service. here are various end types available, including nipple, flange, lap joint (floating) flange and welded pipe ends. All combinations of end types and lengths are available to be custom ordered to meet any application.

2 SPECIFICAIONS 8773 braided flexible connectors are available in ½" through 1" nominal pipe sizes. Standard sizes " through 1" can be ordered with flanged ends. Screwed ends can be ordered up to 8". Bulletin Page temperature 8773-H version have 304 stainless steel end connections C oxygen service hoses also have 304 stainless steel ends and are factory degreased and cleaned for use with oxygen. Materials of Construction olled and butt-welded, corrugated 31 stainless steel tubing incased in a 304 Stainless steel braid. he standard 8773 have carbon steel end connections and the high End ypes Various end types are available. All end types may not be available in all sizes: ype (½", ¾" and 1" sizes only) NP Male Nipple with Intergral Hex Nut ype (1¼" size and larger) Welded NP Male Nipple ype (" size and larger) aised Face Slip-on Pipe End ANSI Class 150 Drilling ype A (" size and larger) Welded Plate Flange Flat Face ANSI Class 150 Drilling ype F (" size and larger) Lap Joint (floating) with Stub End Flange, ANSI Class 150 Drilling ype W Welded Pipe End with 37½" Degree Bevel ype M (DIN 50 thru DIN 300) PN 16 aised Face Metric Flange

3 EMPEAUE and PESSUE AINGS Bulletin Page (Standard), -50 to 750 F 8773-H (High temp), -50 to 1000 F 8773-C (cleaned for oxygen), -50 to 750 F Common piping practice and industry Piping Standards must be observed when selecting a flexible hose assembly. An 8773 hose assembly has a maximum allowable pressure lower than the actual hose rating. Pressure ratings are limited by the various end connection types used. able 1 lists maximum allowable pressure-temperature ratings for carbon steel and 304 SS ANSI flanges (see table 1). Note that pressure ratings decrease as temperature rises. he hose pressure-temperature ratings are higher than the 8773 hose assembly maximum usable pressure (see table ). he hose pressure ratings vary with pipe size and are for the hose maximum working pressure in PSIG at 70F. Contact factory for the availability of hoses with hose ends for higher pressure-temperature ratings. he pressure reducing factor table can be used to determine hose maximum pressure rating at elevated temperatures (see table 3). able Maximum usuable Pressure- emperature ating PSIG. emp. Material F SS Steel -0 to able Hose Pressure NPS ating PSIG ½" 1310 ¾" 915 1" 645 1¼" 545 1½' 560 " 450 ½" 570 3" 450 4" 85 6" 40 8" 17 10" 10 1" 00 able 3 Pressure educing Factors for Hose. emp. Material F SS Steel

4 Bulletin Page 4 PEFOMANCE See able A for the shortest recommended overall length (OAL) for each size. his is the minimum length required for the listed maximum vibration, maximum static offset, and minimum bend radii when using any combination of end types. Lengths shorter than what are listed in the following table are not recommended. VELOCIY 8773 braided hose are rated for 150 ft/sec gas (75 ft/ sec liquid) maximum. When the hose is installed in a bent condition, these flow values should be reduced by 50% for a 90 bend, 5% for a 45 bend, and so on, proportional to the angle of bend. In cases where velocity exceeds the above values, hoses with flexible metal liners can be special ordered. he next larger size corrugated hose would be used with the flexible metal liner size equivalent to the mating pipe size. PESSUE DOP Pressure drop through a corrugated metal hose is approximately three times that in comparable size standard steel pipe. able A Minimum Minimum Minimum Minimum Bend adius ecommended ecommended Nominal Bend adius Intermittent OAL (inches) for ½" OAL (inches) for ¼" Braided Hose Hose OD Weight Static Bend Flexing max. vibration or max. vibration or Hose Size (inches) lb per ft (inches) (inches) 1½" static offset ½" static offset ½" ¾" " ¼" ½" " ½" " " " " " " SEVICE 8773 Flexible braided hoses can be used with natural gas, oil, steam, compressed air, and other gases or fluids that are compatible with the materials of construction. Hoses ordered for oxygen service are factory degreased and cleaned for oxygen applications. Special certified hoses can be special ordered for aplications that require conformity to ANSI B31 piping codes. Flanged hoses selected for oxygen service or hoses requiring ANSI B31 conformity must always use end type (fixed raised face flange) end connections flexible hoses are applicable for the majority of combustion systems and when installed and used properly can last many years. Life expectancy will vary by application and is dependent upon variables such as installation technique, temperature, pressure, movement, vibration, cycle count, external damage, fluid type, and the amount of corrosives in the fluid. he corrosion resistance of the 31 SS material must be considered when exposure to "dirty" gases is possible. he products of combustion from fluxed aluminum melters contain water vapors, chlorides and fluorides and are known to attack 31 SS flexes when used in such applications Contact North American for corrosion resistant solutions and availability of alternate materials like Hastelloy C-76 with special Lap Joint 304 stainless steel plate flanges.

5 DIMENSIONS (inches) Bulletin Page 5 SS braid sleeve Standard welded construction B approx. OD L typ. See diagram for end types SS wire braided over corrugated SS flex hose P nom. pipe size K ID of hose nom. G BC F OD End ypes A A A F P 30 bevel E A ype A Fixed Flange Flat Face ype Fixed aised Face (shown dotted) ype M (not shown) 304 SS sch. 40 stub end ype F Lap Joint (Floating) Flange (stub end shown dotted) H dia. J no. of holes equally spaced C P C P C P ype W Butt-weld end ype - hreaded end with hex on ½", ¾", and 1" sizes only ype - hreaded end 1¼" and larger NOMINAL EF. FLANGED END Designation P K B L C A A E A A F F G H J ¼ ¾ ¾ ½ ¾ 1½ ½ ¾ ¾ 1½ ½ 37 8 ¾ / ¾ 1¾ ½ ¼ ¼ ¾ 3 / ¾ ½ ½ ¾ 3 / / / ¾ ½ ¾ 6 1 / 4¾ 3¾ ½ / ¼ / 5½ 3¾ / ¾ ½ 6 1 / 3¾ / ¾ 7 8 1¼ / 7½ 3¾ ¼ 3 1 / ½ / 9½ See next page for 8" to 1" pipe sizes. Z * = Minimum recommended over all length (OAL) see able A on page 4.

6 DIMENSIONS (inches) Bulletin Page 6 A typ. 1¼" typ. OAL Standard welded construction G BC F OD P nom. pipe size E typ. H dia. J no. of holes equally spaced Designation P A E F G H J ½ 11¾ / 14¼ 1 7 / / 17 1 / 1 7 / 8 1 Z * = Over all length (OAL) see able A on page 4.

7 ODEING INFOMAION Bulletin Page 7 Ordering Example: Specify pipe size, termperature or oxygen service, both end types, and over all length (OAL) when ordering HF/36 Braided hose, " pipe size, high temp F service, F flange one end, lap joint floating flange one end, OAL = 36" H F / 36 / End ype Braided Hose 8773 Nominal Pipe Size -01 ½" -0 ¾" -1 1" - 1¼" -3 1½" -4 " -5 ½" -6 3" -7 4" -8 6" -9 8" " -1 1" Sevice Option Leave blank for standard 750 F -H High temperature 1500 F -C Oxygen service NP Male nipple withhex nut ½", ¾" and 1" NP Male nipple 1¼" to 8" W Butt-weld pipe end 37½ degree bevel ** aised face slip-on ANSI class 150 drilling A Flat face plate flange ANSI class 150 drilling F* Lap joint (floating) with raised face stub end ANSI class 150 drilling M aised face slip-on PN 16 drilling End ype Welded and ested per ASME Section 9 B31.1 (Certificate supplied with shipment upon request). Leave blank for standard B31.1 Special B31.1 option Overall Length (OAL) in 1" increments Not to be less than the minimum recomended OAL. Examples shown: 10 =10" end to end OAL 30 =30" end to end OAL 144 =144" end to end OAL NP Male nipple withhex nut ½", ¾" and 1" NP Male nipple 1¼" to 8" W Butt-weld pipe end 37½ degree bevel ** aised face slip-on ANSI class 150 drilling A Flat face plate flange ANSI class 150 drilling F* Lap joint (floating) with raised face stub end ANSI class 150 drilling M aised face slip-on PN 16 drilling *he type "F" lap joint floating flange allows one flange end to be rotated to simplify installation and easily align bolt holes with a mating flange without imposing torque on the hose. **When selecting flanged ends for oxygen service or to comply with B31 code conformity applications the raised face flange ype "" option must be specified. DIMENSIONS SHOWN AE SUBJEC O CHANGE. PLEASE OBAIN CEIFIED PINS FOM FIVES NOH AMEICAN COMBUSION, INC. IF SPACE LIMIAIONS O OHE CONSIDEAIONS MAKE EXAC DIMENSION(S) CIICAL. WANING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. he presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., is inherent with any combustion application. Parts of this product may exceed 160F in operation and present a contact hazard. Fives North American Combustion, Inc. urges compliance with National Safety Standards and Insurance Underwriters recommendations, and care in operation.

8 INSALLAION HINS Bulletin Page 8 o obtain maximum service life from metal hose, two IMPOAN installation rules must be kept in mind. 1) Do Not orque A hose is subject to torque by: A) wisting in installation. o minimize possible torque damage to a hose, a union or floating flange should be used at one end of the hose assembly. Where flanges are used, the fixed flange end should be bolted into place before the floating flange end. Where a threaded nipple and a union are used, the nipple end should be threaded into place, and then the union tightened into place using two wrenches. B) wisting on flexure. Always install the hose so that flexing takes place in one plane only, and in the plane of bending. ) Avoid Sharp Bends here are many ways a hose can be subjected to recurring sharp bends as a result of improper installation. A few examples are illustrated below. he minimum centerline bend radius for intermittent flexing should never be less than the values specified in the Performance Specifications Section. ight Way Wrong Way MOION AVEL MOION AVEL AVEL AVEL AVEL IGH WONG

9 MOION Bulletin Page 9 Most industrial applications can be reduced to one of five classes of motion: 1) Angular; ) Axial; 3) Offset; 4) adial; or 5) andom. 1. Angular Motion Motion that occurs when one end of a hose assembly is deflected in a simple bend with the ends not remaining parallel. Angular motion may be incorporated in an installation to accommodate misalignment and vibration only, but must not be used to accommodate expansion that would result in unloading the braid. Angular Motion L E L = 180 L = Live Length (inches) = C L Bend adius (inches) E = Angle of Bend (degrees) = Axial Motion his type of motion occurs when one end of a hose assembly is deflected along its longitudinal axis (compressed or extended). Axial motion is applicable to annular corrugated, unbraided flexible hose only (See 878A expansion joints). Neither braided hose nor helical hose like the 8773 (or 8777 flexible nipples) should be used in axial motion applications (compressed or extended). 3. Offset Motion Motion that occurs when one end of the hose assembly is deflected in a plane perpendicular to the longitudinal axis with the end remaining parallel. Offset is measured in inches of displacement of the free end center line from the fixed end center line. In offset motion applications, the offset should never be greater than one-fourth (5%) of the minimum center line bend radius. Y Offset Motion AN L L L = 6Y + Y L = L + Y L M = 9 + L + 3 L = Hose Live Length (inches) L = Projected Linear Length at Offset (inches) = C L Bend adius (inches) Y = C L Offset, Motion (inches) Y M = C L Maximum Offset for a given L and (inches) NOE: Where offset motion "Y" occurs both sides of C L, the hose live length should be based on total travel or times Y.

10 MOION Bulletin Page adial Motion his type of motion occurs when the center line of a hose assembly is bent in a circular arc. In industrial applications, radial motion is most commonly found in traveling loops. raveling Loops For Maximum Vertical ravel raveling Loops For Short Horizontal ravel AVEL AVEL K K L = 4 + K = K 1 K L = K 1 = For Maximum Horizontal ravel AVEL X K = K SUPPO = otal travel (inches) = C L bend radius (inches) L = Hose live length (inches) K = Loop length (inches) 5. andom Motion Non-predictable motion that occurs from manual handling of an assembly. Loading and unloading hose would generally fall into this category. Abusive handling of hose is an important factor to consider in applications involving random motions. he use of an interlocked guard over the corrugated hose is recommended to protect the hose assembly from rough handling and over-bending adjacent to the fittings. andom Motion he hose length is dependent on the confines of areas and distance to be covered.

11 DO'S and DON'S Bulletin Page 11 DO protect the braided outer covering from damage. DON' COMPESS a flexible connector to make it fit! Installing it under compression stresses corrugated element, slackens braid pressure-restrainer, reduces further compressive movement, and generally results in early failure. DON' FOCE-OAE one end of connector to match bolt holes in mating flange. his sets up residual torque-stress in connector, which causes cracking of corrugations or fitting joint. A flexible, connector absorbs vibration, or slow movement perpendicular to its axis. It is NO capable of withstanding torque. DO consider specifying one end with a ype "F" lap joint floating flange to minimize imposing torque stresses on the hose during installation. DON' SECH connector to fit a gap longer than its factory-furnished length. Stretching places excessive residual stresses on braid and fittings. esult? Early rupture. DO be sure to install it at exact normal free length as supplied. If connector is too long, shorten piping. DON' IMPOSE OQUE on connector when making up fittings and don't use a wrench on the ferrule or on the braid. Where a hex end is provided, use it. If not, use the wrench on the fitting length provided. Always use two wrenches, to keep the hose from being torqued as the joint is made up. DON' let welding sparks hit the braid; they may burn some of the braid strands. Protect braid with nonflammable material in front of it when piping must be welded very close nearby. DON' FAIL O ANCHO. Anchor piping close to flexible connector, at end opposite source of vibration. Anchor flexible metal hose at the piping end, never at the equipment end. If hose is not securely anchored, it will transmit all vibration to the piping system. Not only that, it will often act like a spring and actually amplify the vibrations. Whenever possible, install flexible connector to vibrating equipmentbefore valves, pipe line, fittings so that most vibration is absorbed and isolated instead of being transmitted. DO check for leaks and free movement after installation. DON' BEND HOSE sharply near fittings. Fitting end or flange face must always remain perfectly perpendicular to axis of hose. If piping meets at an angle, install hose with a shallow curve along its entire length, leaving small straight section at each end. his kind of installation generally requires a longer hose. DON' LE HOSE support any weight except its own. Its light wall was designed to contain internal pressure, but not to carry external loads. Extra weight will stress and stretch it. DO use hangers on all adjacent piping. Install hangers before installing hose, to be certain weight of pipe is on hangers. DON' FOCE HOSE into too much lateral offset. his puts it under great strain. Also, it cannot then handle any movement of any kind. Avoid excessive force. DO check the literature and do not exceed maximum permissible offset. DO use proper tools for installation. Only wrench on the proper fitting area of the assembly. CONAC US: Fives North American Combustion, Inc East 71st Street - Cleveland, OH USA el: Fax: fna.sales@fivesgroup.com Copyright Fives - All rights reserved Bul /14