Aalco_Datasheet_St_St_Flanges

abc® Aalco is a registered trademark of Aalco Metals Ltd © Copyright: Aalco Metals Ltd, The Hersham Centre, Hersham Green, Hersham, Surrey KT12 4HP All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions. For more complete details please refer to the relevant specification – Specifications for Stainless Steel are listed on a separate Datasheet. Stainless Steel ANSI Pipe Flanges – A Guide 1. What type of flange is required? These flange types apply to ANSI Pipe Flanges and the other types of flange listed under item 2 below. For more information and a complete table of sizes and dimensions please visit the Down-Loads page of the Aalco web site and select the Tubular Products Databook. (http://www.aalco.co.uk/literature/literature.html#stainless) Type Jointing Method General Description Weld Neck Used in critical applications, this is circumferentially welded into the system at its neck which means that the integrity of the butt-welded area can easily be examined by X-ray radiography. The bores of both pipe and flange match thus reducing turbulence and erosion. Slip On This is slipped over the pipe and then fillet welded. Easy to use in fabricated applications Blind Sometimes called a blanking flange, this is used for blanking off pipelines, valves and pumps and as an inspection cover. abc® Aalco is a registered trademark of Aalco Metals Ltd © Copyright: Aalco Metals Ltd, The Hersham Centre, Hersham Green, Hersham, Surrey KT12 4HP All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions. For more complete details please refer to the relevant specification – Specifications for Stainless Steel are listed on a separate Datasheet. Type Jointing Method General Description Socket Weld This is counter-bored to accept the pipe, which is then fillet welded. The bore of both the pipe and the flange are the same to ensure good flows. Screwed / Threaded This requires no welding and is used to connect other threaded components in low pressure non- critical applications. Lap Joint These are always used with either a stub end or a taft which is butt- welded to the pipe with the flange loose behind it. Thus the stub end or the taft always provides the sealing face. Easily assembled and aligned, it is favoured in low pressure applications. To reduce cost these ‘backing’ flanges can be supplied without a hub and/or made from coated carbon steel. Ring Type Joint This can be employed on Weld Neck, Slip On or Blind Flanges for leak-proof connection at high pressures. The seal is made by a metal ring being compressed into a hexagonal groove on the flange face. abc® Aalco is a registered trademark of Aalco Metals Ltd © Copyright: Aalco Metals Ltd, The Hersham Centre, Hersham Green, Hersham, Surrey KT12 4HP All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions. For more complete details please refer to the relevant specification – Specifications for Stainless Steel are listed on a separate Datasheet. 2. Other types of flange Type General Description Plate or Table (BS10 / EN????) These are produced to suit Nominal Bore / NPS Pipe Sizes. They are produced from bar or plate rather than forgings and are not pressure rated. Blind and Slip-On, flat-faced, types are readily available in grades 304L and 316L in sizes from ½” to 6” as Table D and Table E, with larger sizes and other Tables (thicknesses) made to order. These economical flanges are used for light-duty applications where corrosion resistance is the primary consideration rather than high pressure or temperature. BS4504 / EN1092??? Also referred to as PN Flanges These are not interchangeable with ANSI Flanges They are available readily available in types 304L and 316L with various pressure ratings of which 10 Bar & 16 Bar are the most commonly used. Metric Tru-Bore Please visit the Down-Loads page of the Aalco web site http://www.aalco.co.uk/literature/literature.html#stainless and select the brochure on this product range. Hygienic Please refer to separate Datasheet 3. What size is the flange? This will be the same size as the pipe – Nominal Bore / Nominal Pipe Size, and for Weld Neck Flanges the Schedule Wall Thickness. 4. What grade of stainless steel is required? This will normally be the same as the pipe with the most readily available grades from stock being 304L and 316L. Flanges can be made to order in most Austenitic and Duplex grades. 5. What sort of face should it have? Of the four choices available the most common configurations are: ♦ For ANSI and BS4504 – Raised Face ♦ BS10 - Flat Face. Note that this does not apply to Screwed or Lap Joint Flanges. Face Notes Raised Face To facilitate welding Flat Face Ring Type Joint (RJT) For leak-proof connection at high pressures Tongue & Groove – Small or Large abc® Aalco is a registered trademark of Aalco Metals Ltd © Copyright: Aalco Metals Ltd, The Hersham Centre, Hersham Green, Hersham, Surrey KT12 4HP All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions. For more complete details please refer to the relevant specification – Specifications for Stainless Steel are listed on a separate Datasheet. 6. What finish is required on the face? The finish is given as a surface roughness measured as Arithmetic Average Roundness Height (AARH). The finish requirements are stipulated by the standards, such as ANSI B16.5 and are within the range 125AARH to 500AARH, which is equivalent to 3.2 to 12.5 RA. 7. What is the required pressure rating? (The pressure rating will also determine the dimensions of the flange – Full details can be found in the relevant specification. ) Flange Type ANSI B16.5 lbs BS3293 lbs** ANSI B16.47 Series A MSS SP-44 lbs** ASME B16.47 Series B API 605 lbs** BS4504 BAR Weld Neck 150-2500 150-600 150-900 150-300 2.5-40 Weld Neck Ring Type Joint 300-2500 300-600 300-900 150-300 N/A Slip On 150-1500 150-600 - - 2.5-40 Slip On Ring Type Joint 300-1500 300-600 - - N/A Threaded 150-2500 - - - 6-40 Lap Joint 150-2500 - - - 6-40 Blind 150-2500 - - - 2.5-40 Socket Weld 150-1500 - - - N/A Note: **Flange sizes 26” and above 8. What semi-finished product should the flange made from? Forging A182 Plate ASTM A240 Bar Casting ANSI B16.5 √ √ - - BS3293 / EN??? √ - - - MSS SP-44 √ - - - API 605 √ - - - BS4504 / EN??? √ √ - √ BS10 / EN???? √ √ √ √ Notes: ♦ ASTM A240 plate can be used to manufacture ANSI B16.5 blind flanges, but this is not generally accepted in the UK. ♦ Most small BS10 flanges are normally made from bar as trhis is the most economical manufacturing process. abc® Aalco is a registered trademark of Aalco Metals Ltd © Copyright: Aalco Metals Ltd, The Hersham Centre, Hersham Green, Hersham, Surrey KT12 4HP All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions. For more complete details please refer to the relevant specification – Specifications for Stainless Steel are listed on a separate Datasheet. 9. What markings will be on the flange? All flanges should be permanently marked on the external diameter of the base with: ♦ Pipe Size (NPS / NB) ♦ Pipe Wall Thickness (Schedule) if appropriate ♦ Specification ♦ Grade ♦ Heat Number ♦ Manufacturer’s Name or Symbol This information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company is respect of any action taken by any third party in reliance thereon As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose. Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.