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3Stainless Steel Pipe, Fittings& FlangesStainless Steel Pipe, Fittings & Flanges3Photography courtesy of Outokumpu, Arcelor, Atlas Steels and New Zealand Tube Mills.

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Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesStainless Steel Pipe, Fittings & FlangesA stainless steel pipe system is the product of choice for carrying corrosive or sanitary fluids,slurries and gases, particularly where high pressures, high temperatures or corrosiveenvironments are involved. Due to stainless steel’s aesthetic properties, stainless steel pipe isalso used in architectural applications.Stainless steel pipe can be generally defined as a heavy wall thickness tubing, with dimensions asspecified by the American National Standards Institute (ANSI). Pipe dimensions are specified by outsidediameter – indicated by the NPS (imperial) or DN (metric) designator and sometimes confusingly referredto as the ‘nominal bore’ – and wall thickness, reflected in the schedule number. ASME B36.19M coversthese dimensions.Stainless steel pipe and fittings are supplied in the annealed condition to facilitate fabrication and ensurebest corrosion resistance. Atlas Steels can also supply stainless steel pipe with an abrasive polishedexternal finish suitable for architectural applications.Welded PipeWelded stainless steel pipe is manufactured from 2B or HRAP stainless steel strip – formed to shape,longitudinally welded and annealed.Large size pipe is fabricated from plate.All welds are made without the addition of filler metal, except for very large diameters.Standard welded pipe is in nominal lengths of 6.0 or 6.1 metres.Manufacturing specification: ASTM A312M – AusteniticASTM A358M – Austenitic (large diameter)ASTM A790M – DuplexSeamless PipeSeamless stainless steel pipe is produced from hollow billets, which are pierced then usually cold drawnuntil they reach the final desired pipe size, then annealed.Standard seamless pipe is supplied in nominal lengths of 6.1 metres to DN 150 (NPS 6) and above this inrandom lengths.Manufacturing specification: ASTM A312M – AusteniticASTM A790M – DuplexStainless steel piping systems can be joined by butt welding and, in the heavier 40S and 80Sschedules, by threaded connections.The complete piping system is made possible using complementary fittings and flanges. These arespecified by the same DN or NPS designator and schedule numbering system as for pipe.October 2016Page 3 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesButt Welding Pipe FittingsA piping system using butt welding fittings has many inherent advantages over other forms. Welding a fitting to the pipe means that it is permanently leak proof The continuous metal structure formed between pipe and fitting adds strength to the system Smooth inner surface and gradual direction changes reduce pressure losses and turbulence andminimise the action of corrosion and erosion A welded system utilizes a minimum of spaceAtlas Steels Supply Butt Welding Fittings in the following forms Elbows 45o and 90o – long radius is standard; short radius is also available Return bends 180o – long radius is standard; short radius is also available Reducers – concentric and eccentric Tees – equal and reducing Caps Stub ends – Type B, to MSS SP-43Butt welding fittings can be supplied in either seamless or welded construction and are covered byspecification ASTM A403M (or ASTM A815M for Duplex grades) and ASME B16.9.Screwed and Socket Weld FittingsPiping systems can be connected using screwed fittings – BSP threaded (“150lb”) low pressure fittingsand NPT threaded (class 3000) high pressure fittings in Grade 316.Socket weld fittings are used in high pressure piping systems and are available in grade 316L to suitschedule 80S wall thickness piping.Manufacturing specification: ASTM A182M (Class 3000 NPT and socket weld) andASME B16.11ISO 4144 (BSP dimensions)Pipe FlangesA flange is a ring of steel (forged, cut from plate, or rolled) designed to connect sections of pipe, or to joinpipe to a pressure vessel, valve, pump or other integral flanged assembly.Flanges are joined to each other by bolting, and are joined to the piping system by welding or threading(or loose when stub ends are used).The basic types of flanges are: Slip-onBlindWeld neckThreadedOctober 2016 Socket weldLap jointOrificePage 4 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesForged stainless steel flanges are designed to the following common pressure ratings:Classes 150, 300, 600, 900, 1500 and 2500. Standard sealing face is Raised Face (RF).Manufacturing specification: ASTM A182M and ASME B16.5.(Flanges over NPS24/DN 600 to ASME B16.47, API 60S or BS 3293)Plate stainless steel flanges are forged or cut and machined from plate – Table ‘D’, Table ‘E’, etc.Manufacturing specification: AS2129Waterworks flanges to AS4087 and PN16 flanges to EN 1092-1 are also available subject to enquiry.Types and Applications of FlangesSlip-on flanges – the flange is slipped over the pipe and then welded both inside and outside to providesufficient strength and prevent leakage. Slip-on flanges are also used as loose back-up flanges whenType B stub ends are used.Blind flanges – this is a flange without a centre bore, used to shut off a piping system or vessel opening.Weld neck flanges – designed to be joined to a piping system by butt welding. They are relativelyexpensive due to the weld neck, but are preferred for high-stress applications.Lap joint flanges – this is again similar to a slip-on flange, but has a radius at the intersection of thecentre bore and the flange face to accommodate a Type A lap joint stub end. Lap joint flanges and TypeA stub ends are not commonly stocked in Australia.October 2016Page 5 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesStainless Steel Pipe – Welded & Seamless – ASTM A312M / ASTM A790MGrades: 304/304L, 316/316L, 2205Stainless steel pipe is available in a wide range of sizes in welded and seamless construction, ex-stock oron indent.NominalPipe Size Wall Thickness (mm)DNNPSOutsideDiameter(mm)6⅛8Sch 5SWT(mm)Sch 10SSch 40SSch t(kg/m)Stainless steel pipe nominal dimensions listed in the table are based on ASTM A312M and ASME B36.19M.These dimensions are nominal – substantial tolerances apply – refer to Atlas Steels TechNote 12 and the ASTMand ASME standards for details.For other wall thicknesses and larger sizes consult ASME B36.10M; stainless steel pipe may be available tothese carbon steel pipe sizes.October 2016Page 6 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesWelded Butt Welding Fittings – ASTM A403M & ASME B16.9Product range and theoretical weights (kg)Schedule 10SSchedule 40S900Elbow450ElbowEqualteeStubend typeBEnd cap900Elbow450ElbowEqualteeStubend typeBEnd : Butt welding fittings are usually supplied as dual certified 304/304L or 316/316LOctober 2016Page 7 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesWelded Butt Welding Fittings – ASTM A403M & ASME B16.9Product range and theoretical weights (kg)Schedule 10SSchedule 6.7036.7087.54Grades: Butt Welding Fittings are usually supplied as dual certified 304/304L or 316/316LOctober 2016Page 8 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesSeamless Butt Welding Fittings – ASTM A403M & ASME B16.9Product range and theoretical weights (kg)Schedule 10SDN00Schedule 40S00Schedule 80S090 Elbow45 ElbowEqual tee90 Elbow45 ElbowEqual tee90 Elbow450 ElbowEqual s Butt Welding Fittings – ASTM A403 & ASME B16.9Product range and theoretical weights (kg)Schedule 10SSchedule 40SSchedule 086.746.7418.8210.1210.1225.31 Austenitic grades specified to ASTM A403MDuplex grades specified to ASTM A815MButtwelding fittings are usually supplied as dual certified 304/304L or 316/316LDuplex grades 2205 and 2507 are also available in certain sizes.October 2016Page 9 – Section 3www.atlassteels.com.au

Atlas Steels – Product Reference ManualSection 3 – Stainless Steel Pipe, Fittings & FlangesStainless Steel Butt Welding Fittings – DimensionsButt Welding Fittings to ASME B16.9ElbowsNominal 2203254305356406457508559610Stub EndsCapsLongReducersNote 71521521