U Bend Tube

STAINLESS STEEL U BEND TUBE, STAINLESS STEEL U SHAPED TUBES,HEAT EXHANGER TUBE, SEAMLESS  STAINLESS STEEL U BEND TUBE, ASME SA 213 STAINLESS STEEL U BEND TUBE, EN10216 STAINLESS STEEL U BEND TUBE, HEAT EXCHNAGER TUBING, U BEND TUBING, AUSTENITIC STAINLESS STEEL U BEND TUBING, U BEND TUBES MANUFACTURE IN CHINA



  •  U bend tube is one of components fixed to U bend heat exchangers by flow baffles or tube supports and placed in a shell to control the fluid present in the exterior of the tube assembly. The fluid is guided into the tubes by a head assembly which is fixed to the shell by bolts. Heat exchanger Tube is designed for heat transfer processing for heating, ventilation, cooling, condensation and evaporation of liquids, gases and steams. They are always made with cold finished condition as one of components placed inside the barrel  for fabricating the shell & tube, plate & frame heat exchangers, cooling towers, air & seawater coolers, condensers, evaporators, heaters and re-heaters, etc. 


    Features

    Ideal heat transfer performance: due to the excellent performance of stainless steel material and the use of thin-walled tubes with smooth inner walls to enhance the heat transfer effect.It has a high thermal conductivity and good isothermal.

    High Safety: High temperature steam resistance, corrosion resistance and strong vibration resistance.    

                                                                                                                                                      

    Processing Description

    • All U bend tubes' wall thining at the bend to be <17% of original tube wall thickness.                                                 

    • All U bend tubes' ovality at the bend to be <10% of original tube outside diameter.

    • After bending, solution annealing shall be carried out for those items, bend radius < 5D. The heating shall be done by electric resistance heating in a protective atmosphere and followed by rapid quenching.

    • Scale formed during the heat treatment shall be removed by pickling or polishing inside and outside surfaces.

    • All U bend tubes bends to be supplied with correct leg lengths,cut square and de-burred.

    • After bending, solution annealing and pickling, all U-tube shall be hydro tested.

    • On completion and final inspection, all U-tubes to be tagged with row number and packed in steel structure with plywood


    Industries Applied 
    Nuclear Industry, Chemical Industry 
    Petrochemical industry, Food and Beverages
    HVAC (Heating Ventilation Air Conditioning), refrigeration 
    Power Generation, Petroleum Refineries ,Natural-gas processing


    General Information

    Outside Diameter (OD)
    12.7 - 38.1mm
    Wall Thickness (WT)0.89 - 3.77mm
    Bending  RadiusFrom 1.5 * OD to 1500mm
    Straight Tubes Max. Length(Before  Bending): 35000 mm
    Leg LengthMin 1 Meter, Max. 16500 mm (For Max R=1500mm)
    Initial  LengthMaximum Lengths of 27000mm,Other Size Are Available Upon Agreement.
    Straightness tolerance maxmax. 1,5 mm per 1.0 m
    Radius tolerance +/- 3 mm for R 100 mm; +/- 5 mm for R ≥ 100 mm 
    Tube endsvertically cut to the tube axis,covered with plastic caps
    Heat TreatmentStress Relieved After U - Bending (Bending Area Plus 300MM For Each Leg)
    Packing DetailsVertical separators for eachradius,packing lists are placed on each plywood case for identification
    Heat TreatmentStress Relieved After U - Bending (Bending Area Plus 300MM For Each Leg)


    Standard

    DesignationSpecification
    ASTM, ASME Standards
    A213/SA213Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
    A269/SA269-15Seamless and welded austenitic stainless steel tubing for general service
    A312/SA312Seamless and welded austenitic stainless steel pipes
    A/789/SA789Seamless and welded ferritic-austenitic stainless steel tubing for general service
    A790/SA790 Seamless and welded ferritic-austenitic stainless steel pipe
    DIN Standards
    DIN 17456General purpose seamless circular stainless steel tubes
    DIN 17458Seamless circular Austenitic stainless steel tube subject to special requirement
    DIN 28180Stainless steel heat exchanger tubes
    DIN 17459Seamless Circular High Temperature Austenitic Stainless Steel Tube Subject To Special Requirement
    European Standards
    EN 10216-5Seamless steel tubes for pressure purposes
    JIS Standard
    JIS G 3459Stainless steel pipes
    JIS G 3463Stainless steel boiler and heat exchanger tubes
    GOST Standards
    GOST 9941Seamless stainless steel tubes, cold and hot finished
    TU 14-3-460Seamless Steel Pipes for Steam Boilers and Pipelines


    Destructive testing
    • Thermal performance test
    • Mechanical test
    • Tensile test
    • Hardness test
    • Pressure test
    • Compression test
    • Leakage test

    Non-destructive testing
    • Pitting corrosion test
    • Micro test
    • Macro test
    • Radiography
    • PMI test
    • Intergranular corrosion test
    • Chemical test

    Typical Material Grades and Chemical Composition

    AusteniticNearest equivalent standardTypical Chemical composition
    ASMEAISI UNSGBENJISCmaxCrNiMoCuOthers
    TP304S304000Cr18Ni91.4301SUS 3040.0818.0–20.08.0–11.0


    TP304LS3040300Cr19Ni101.4307SUS 304L0.03518.0–20.08.0–12.0


    TP304HS3040307Cr19Ni101.4948SUS 304H0.04-0.118.0–20.08.0–11.0


    TP321S321000Cr18Ni10Ti1.4541SUS 3210.0817.0–19.09.0–12.0

    5(C+N)<Ti< 0.7
    TP321HS321001Cr18Ni9Ti1.4878SUS 3210.04-0.117.0–19.09.0–12.0

    4(C+N)<Ti< 0.7
    TP347S34700Cr18Ni11Nb1.455SUS 3470.0817.0–20.09.0–13.0

    10×C<Nb<1
    TP347HS347091Cr19Ni11Nb1.4912SUS 3470.04-0.117.0–19.09.0–13.0

    8×C<Nb<1.10
    TP316S316000Cr17Ni12Mo21.4401SUS 3160.0616.0–18.010.0–14.02

    TP316LS3160300Cr17Ni14Mo21.4404SUS 316L0.0316.0–18.010.0–14.02

    TP316HS3160907Cr17Ni12Mo21.4919SUS 316H0.04-0.116.0–18.011.0–14.02

    TP316 TiS316350Cr18Ni12Mo2Ti1.4571SUS 316Ti0.0316.0–18.010.0–14.02
    N0.015(C+N)<Ti< 0.7
    TP317S317000Cr19Ni13Mo31.4438SUS 317L0.0818.0–20.011.0–15.03

    TP317L3170300Cr19Ni13Mo31.4438SUS 317L0.0318.0–20.011.0–15.03

    TP309SS3090806Cr23Ni131.4833SUS 309S0.822.0–24.012.0–15.0


    TP310S3100020Cr25Ni201.4841SUS 3100.0824.0–26.019.0–22.0


    TP310SS310080Cr25Ni201.4845SUS 310S0.124.00-26.019.00-22.0


    TP310HS31009
    1.4845SUS 310H0.0824.0–26.019.0–22.0


    TP904LN08904015Cr21Ni26SiMo5Cu21.4539SUS 904L0.0219.0 – 23.023.0 – 28.041.0-2.0
    Austenitic Ferritic Steel / Duplex Stainless Steel
    2101S32101
    1.4162DP20.0420.0-23.01.0-3.00.10.1N 0.20
    2205S32205022Cr23Ni5Mo3N1.4462DP20.0321.0-23.04.5-6.53
    N 0.14
    S31803S31803022Cr22Ni5Mo3N1.4462DP20.0321.0-23.04.5-6.52.5
    N 0.08
    2304S32304
    1.4362DP20.03
    3<0.05-0.60.6N 0.2
    2507S32750022Cr25Ni7Mo4N1.441DP20.0324.0-26.06.0-8.030.5N 0.32


    Demension Range