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Stainless steel pipe fittings design: Stainless steel pipe fittings design personnel should decide the matter is very much, and every problem needs to be rich Knowledge and experience, in the full study to make decisions one by one. Items should be determined to have: stainless steel pipe material; Diameter of stainless steel pipe; Wall thickness of stainless steel pipe; The stainless steel pipe installation in what position, drawn from what place, The stainless steel piping layout and arrangement; The branch of the stainless steel pipe and confluence practices; The form and position of stainless steel pipe joint, The position and form of support bracket, We use specifications and types of valves, the installation position, The lubrication and hydraulic control system, the practice of stainless steel pipe fittings; stainless steel pipe thermal expansion compensation, Cold insulation and heat insulation practices; Drainage and gas practice, The liner. To determine the above matters, and then according to the stainless steel pipe flow chart, the actual design of the stainless steel pipe fittings. Conditions to meet the requirements of the decision Meet the conditions of use; Meet the requirements of the current standards, codes and procedures; Meet the performance of the device; The operation is convenient, no obstacle, It does not affect the safety; The maintenance and use of barrier free; The spare parts maintenance and repair without obstacles If there is no mandatory force parts; I have no easy to cause the leak; The increase will not cause vibration, and resonance phenomenon; Fault does not occur during start and stop and parking; Do not use to buy materials; Without the use of hard materials; Meet economy, equipment and so on. The above conditions must be fully satisfied.

What is socket weld flange? Socket welding flange, a popular type of pipe flange, was initially developed for use on small-sized high- pressure piping. The fabrication of this type of flange is similar to that of a slip-on flange. However, the internal pocket of a socket weld flange allows for a smooth bore and better fluid flow. When provided with an internal weld, the static strength of this flange is equal to slip-on flange, but the fatigue strength is 50% greater than double welding slip-on flanges. Smooth bore conditions in such a flange can easily be attained without having to bevel the flange face and, after welding, to reface the socket weld flange as would be required with slip-on flanges. For this reason, the internally welded flange is popular in chemical process piping. Materials used: Stainless Steel: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L Duplex Steel:  ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61 Alloy Steel: ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 Carbon Steel:  ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70 Key Features: The recess on the inside diameter of the socket weld flange allows for a good fit of the pipe allowing for a smooth flow of liquid. Socket welding flanges work well for smaller sizes and higher pressure temperature conditions. They are similar to slip-on flanges, but must specify the schedule of the pipe where they will be used for with socket welds. Uses of socket weld flanges: They are ideal for small diameter applications. They are used for high pressure applications. Socket weld flanges have an internal recess on the inside diameter which allow for a smoot flow of the process fluid. They create a smooth bore with the proper welding and grinding. Standards, Dimensions & Weight ASME/ANSI B16.5 Class 150 SW ASME/ANSI B16.5 Class 300 SW ASME/ANSI B16.5 Class 600 SW ASME/ANSI B16.5 Class 1500 SW The socket weld flange is generally applied on pipes with smaller sizes but high pressure. These pipe flanges are attached by inserting the pipe into the socket end and applying fillet weld around the top. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe. Slip on Pipe flanges with a hub has published specifications that range from 1/2 inch to 24 inch. Socket Weld flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for socket weld pipe flanges, the standard height is 1/16 inch for socket weld pipe flanges less than 400#. For socket weld pipe flanges of 400# and up, the standard socket weld pipe flange raised face height is 1/4 inch. Product name : socket weld flange A Socket Weld Flange is similar to a Slip On Flange, however Socket Weld Flanges have an internal recess on the inside diameter to allow for a smoother flow of the process fluid. This creates a smooth bore with the proper welding and grinding. However a Socket Weld Flange can be more expensive than a Slip On Flange due to the more intricate machining. Socket Weld Flanges were initially developed for use on smaller sizes of pipe at higher pressure ratings. Size ½” (15 NB) to 48″ (1200NB)Class  150#, 300#,400 #,600#,900#, 1500# & 2500 # MaterialGrade Stainless Steel  ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L  Duplex Steel   ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61  Alloy Steel ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91  Carbon Steel ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70In FormSORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etcSpecializeAs per drawing Value Added Services» CNC Machining  » Customized FlangesStandard » ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 » DIN :  DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673 » B.S : BS4504 , BS4504, BS1560, BS10

Oil & Gas Non-Metallics 2016International conference on polymer material selection, qualification and use in oilfield and gas engineering applicationsDate: 12/12/2016 – 12/14/2016Venue: Radisson Blu Portman Hotel, London, United KingdomPlease note ! All dates are subject to changes.The 2nd AMI international conference on Oil & Gas Non-Metallics 2016 will take place in London. There will be a Welcome Cocktail Reception and accompanying exhibition on the first evening followed by a 2-day technical programme. AMI’s Oil & Gas Non-Metallics 2016 offers a technical forum for oil and gas operators, engineers, contractors and material and equipment suppliers to debate the use of non-metallic materials in critical applications.  Event news: Website: http://www.amiplastics.com/events/Organizers

Control measures to prevent corrosion of outer wall and inner wall of stainless steel pipe fittings and components (a) minimum requirements and procedures for the prevention of corrosion and corrosion on the outer wall and inner wall ofstainless steel pipe fittings and components, and is suitable for new pipeline projects and existing pipeline systems. (b) the corrosion of the outer wall and inner wall shall be controlled according to the conditions of the pipeline system, combined with the bad environment of the system, and the corrosion control requirements and procedures specified in this chapter. In order to effectively reduce the corrosion, some corrosion control methods need to be used in the use of judgment. In certain circumstances, the provisions in this chapter are allowed to deviate, as long as the company has proved to be able to achieve the purpose of this chapter. (c) corrosion control requirements and procedures, in many cases require additional measures. Therefore, each operating company should be another program, in order to supplement the requirements of this chapter. Various procedures, including the design, installation and maintenance of cathodic protection systems, must be trained or experienced by the corrosion control methods to prepare, or under the guidance of. The NACE standard RP-01-69, or underground metal pipeline external corrosion under water control system recommended standards, can be used as the preparation and maintenance of cathodic protection monitoring system program guidance, to supplement the requirements. (d) anti personnel should be equipped with necessary equipment and instruments in order to carry out the work. (E) anticorrosion insulation team and the inspector shall give proper guidance, and equipped with the necessary equipment, so as to coat and pipe testing and component. Buried line or water pipe external corrosion control. (a) for the underground or underwater stainless steel pipe system, should be for each component in the system to provide the control of external corrosion on unless operating companies can by experiment, investigation, or experience that the laying of pipelines in the application area, there is no injurious corrosive environment. Within 12 months after the installation of the pipeline system, operating companies to deal with underground or underwater for electrical inspection, if the electrical examination results indicate the presence of corrosive conditions, the pipeline system should be installed and cathodic protection. If you do not install the pipeline cathodic protection system should not exceed 5 years, an electrical inspection, if the test results indicate the presence of corrosive conditions, the system should be installed for cathodic protection. (b) new device (including new pumping stations, storage tanks and the oil depot, existing pipeline system change the line, replacement, or rebuilding project) underground or underwater stainless steel pipe fittings and components of the external corrosion control should be the effective anti-corrosion and insulation layer supplemented by cathodic protection complete. The stray current, is Yingfu with suitable drainage device. The selection of material, consideration should be given to the auxiliary anticorrosion measures type and environmental conditions. (c) for offshore pipeline system, should pay special attention to the external corrosion control “splash” stainless steel pipe fittings. (d) if you can not achieve the provisions on the underground stainless steel pipe fittings and other underground structures endpoint minimum distance of 12 inches, but it has well corrosion control measures, the distance can be reduced.

The so-called “drum” is not fit to die, bulge phenomenon strip stainless steel arc tube. Causes: (1) the outer mould under pressure, no pressure in the end, the circular arc surface and on the surface of the horseshoe mold to strip out flat uplift. (2) two track horseshoe cross, so that can not be completely pressed into the mould. It emerged in the arc bulge. The solution: (1) increase the pressing force of stainless steel pipe fittings. (2) structure to shorten the length of the horseshoe, or shorten the length of the structure of central core, the horseshoe trajectory will not overlap. The 6 outer arc “straighten” and disposal method. The so-called “straighten” refers to the two parts of straight section in flanking arc phenomenon. Causes: (1) the outer mould under pressure without pressure to mould and tightly, so in its two flanking office, pipe flat. (2) because of the activity of cross path horseshoe, the pressure caused by the positioner can. Disposal measures: (1) increase the pressing force of stainless steel pipe fittings. (2) structure to shorten the length of the horseshoe, or shorten the length of the structure of central core, the horseshoe trajectory will not overlap.

What is weld neck flange? A weld neck flange is a type of pipe flange that incorporates a cast-in neck that is welded to the pipe. Unlike a plain flange that is slipped over the pipe prior to being welded into place, a weld neck flange has a spout-like neck that is beveled to match up to the pipe. Once the pipe is beveled to match the weld neck flange, a perfect V shape is created in which a butt weld is placed to connect the two components. The benefit of a weld neck flange is that the welded connection does not interfere with the flow of liquid through the flange. By placing the weld joint at the end of the funnel-like neck of the flange, the pipe is much easier to align to the flange, and a stronger weld is typically possible with this type of flange. The flange’s neck is also perfectly beveled to demonstrate the type of bevel that the welder must place on the pipe before making the connection with the flange. The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design. Product name : weld neck flange A Weld Neck Flange is drilled with the wall thickness of the Flange having equal dimensions to the matching pipe. The lighter the pipe is the larger the bore is in the Weld Neck Flange. And conversely the heavier the pipe is the smaller the bore is in the Weld Neck Flange. Weld Neck Flanges are usually used in high pressure systems and are suitable for cold or hot temperatures. Size 1/2″NB TO 60″NBClass  150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. MaterialGrade Stainless Steel  ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L  Duplex Steel   ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61  Alloy Steel ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91  Carbon Steel ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70In FormSORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etcSpecializeAs per drawing Value Added Services» CNC Machining  » Customized FlangesStandard ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN Flanges Standards, Dimensions & Weight of Welding Neck Flanges ASME/ANSI B16.5 Class 150 WN ASME/ANSI B16.5 Class 300 WN ASME/ANSI B16.5 Class 600 WN ASME/ANSI B16.5 Class 900 WN ASME/ANSI B16.5 Class 1500 WN ASME/ANSI B16.5 Class 2500 WN ASME B16.47 Series A 150 WN ASME B16.47 Series A 300 WN ASME B16.47 Series A 600 WN ASME B16.47 Series A 900 WN ASME B16.47 Series B Class 150 WN ASME B16.47 Series B Class 300 WN ASME B16.47 Series B Class 600 WN ASME B16.47 Series B Class 900 WN

The so-called “duck” is on both sides of the nozzle of the two stainless steel lap joint stub end in chevron wrinkle phenomenon. In the elbow on outer surface, appeared the chevron shaped wrinkle. Cause analysis, (1) stainless steel lap joint stub end pipe joint baiting size is too long, affects is milled down action. (2) the horseshoe cross section geometry size is not appropriate. May be on the surface of the water chestnut long axis of the oval (i.e., horizontal diameter) is less than pipe diameter, short axis (perpendicular to the diameter) is too short, when the upper and lower clamping fixture and laminating, periods of excessive, make the neutral surface of tube wall extrusion and formation of the “duck”. (3) the upper and lower clamping fixture outside the arc diameter stainless steel lap joint stub end diameter, make fluctuation is milled joint clearance is too large, the wall extrusion to form a duck mouth. Disposal method: (1) shorten the socket baiting size. (2) in the long axis and short axis of horseshoe cross section welding, in order to increase the thickness. (3) modification on either side of the tire under the slide guide, guarantee of concentricity and flat Line. Or heating is milled and hammer its profile, in order to adjust to shorten the diameter of the stainless steel lap joint stub end outer arc. wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

What is slip on flange? The Slip On flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide sufficient strength and prevent leakage. Slip On flanges are all bored slightly larger than the O.D. of the matching pipe, They are preferred over welding neck flanges by many users due to their lower initial cost, but final installation cost is probably not much less than that of the welding neck flange because of the additional welding involved. Slip On flanges or SO flanges are commonly lower in price than weld-neck flanges, and to this effect are a popular choice for our customers. However, customers should bear in mind that this initial cost saving may be diminished by the additional cost of the two fillet welds required for proper installation. Moreover, weld-neck flanges have a higher life expentancy than Slip On flanges under duress. The Slip On flange is positioned so the inserted end of the pipe or fitting is set short of the flange face by the thickness of the pipe wall plus 1/8 of an inch, which thus allows for a fillet weld inside the SO flange equal without doing any damage to the flange face. The back or outside of the Slip On flange or SO flange is also welded with a fillet weld. Slip On Flanges are probably the most common type of flanges in the industry and are ideal for lower pressure applications.  You do not have to specify the pipe schedule when using Slip On flanges due to the fact that its inside diameter is determined by the outside diameter of the pipe.  This outside diameter of the pipe does not change for the different schedules.  This often makes these easier to stock for vendors.  Fabricators also like the fact that these flanges are slightly easier to align than weld neck flanges.  They also are slightly easier to cut pipe to the proper length for.  They can be used for high temperature and pressure applications but are not generally recommended as compared to other types of flanges. Slip On flanges or SO flanges are preferred by some contractors, over the Weld-neck, because of the lower initial cost. However, this may be offset by the added cost of the two fillet welds required for proper installation. The strength of the Slip On flange is ample for it’s rating, but its life under fatigue conditions is considered to be only one-third that of the weld-neck flange. The Slip On flange may be attached to the end of a piece of pipe or to one or more ends of a pipe fitting. The Slip On flange is positioned so the inserted end of the pipe or fitting is set back or short of the flange face by the thickness of the pipe wall plus 1/8 of an inch. This allows for a fillet weld inside the SO flange equal to the thickness of the pipe wall without doing any damage to the flange face. The back or outside of the flange is also welded with a fillet weld. A variation of the Slip On flange also exists. This is the Slip On Reducing Flange. This is simply a larger (say a 14″) Slip On flange blank that, instead of the Center (pipe) hole being cut out (or drilled out) for 14″ pipe it is cut out for a 6″ (or some other size) pipe. The SO Reducing flange is basically used for reducing the line size where space limitations will not allow the length of a weld neck flange and reducer combination. The use of the Slip On Reducing Flange should only be used where the flow direction is from the smaller size into the larger size. A slip on flange is bored so that it does indeed slip onto the pipe so that the end of the pipe is just inside the flange a fraction of an inch from the flange face. The pipe end has been cut square. The flange bolt holes are aligned and the flange face squared to the pipe. Then a fillet weld is run around that end of the pipe to fuse it to the inside of the bore of the flange. Another fillet weld is run around the back end of the flange hub fusing it to the outside of the pipe. This is the most common welding flange. Before the final full fillet welds are made, temporary tack welds are made until alignment is assured. These tacks are easy to cut out so a correction can be made. There are socket-type Slip On flanges where only the outside weld is made. The squared pipe end butts against a lip inside the flange bore. Product name : slip on flanges A Slip On Flange is slightly larger than the outer diameter of the pipe it is to be used with. The pipe is slipped into the Flange prior to welding both inside and outside. High quality Slip on Flanges are ideal for lower pressure applications. The Slip On Flange’s ease of fitting and welding also reduces fabrication costs. Size ½” (15 NB) to 48″ (1200NB)Class  150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. MaterialGrade Stainless Steel  ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L  Duplex Steel   ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61  Alloy Steel ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91  Carbon Steel ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70In FormSORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etcSpecializeAs per drawing Connection TypeRaised Face, Flat Face, Ring Type Joint, Lap-Joint Face, Large Male-Female, Small Male-Female, Large Tongue & Groove, Small Tongue & Groove Standard ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN

What is long weld neck flange? Long weld neck flange(LWN flange) is also call integral flange, it means a welding neck flange has a very long neck. Commonly, the welding neck flange has a tapered neck and a bevel end which is going to butt welding with the matching pipe. But the long weld neck flange, has a straight short pipe as the neck of a long weld neck flange. Uses: LWN flanges are largely used in the petroleum and chemical industries but can also be used in residential and commercial buildings where fluctuating temperatures and high stress are expected, such as a main water or gas source. Long neck steel flanges are used under conditions where line or pipe expansion creates bending or repeated changes in the pipe. Because a long neck flange is used in pressurized applications, the flange may have additional pressure connections and may be referred to as an orifice flange. The flange supports free product flow when bored to match the diameter of the pipe it will receive. Long weld neck flanges are attached using V-shaped welds known as butt welds. Standards: Manufacturers of steel flanges follow specific production standards when designing or machining a flange. Dimensional tolerances and dimensions for long neck orifice flanges are covered in the American Society of Mechanical Engineers section 36 of publication B16. AMSE publication B.16 covers pipes and fittings made of steel, cast iron, cast bronze and wrought copper. Dimensions of Long Weld Neck Flange: The long weld neck flange should be butt welded with the pipes, it means the neck dimensions is same with the matching pipe, same diameter and wall thickness , commonly the long weld has a plain end, not a bevel end for welding . Except the neck, the LWN flange has a same dimensions with the welding neck flange. In addition, there are also the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall” which name is Nozzle . Sealing Face of the Long Weld Neck Flange: The sealing face of the long weld neck flange is same with the weld neck flange, so it could be raised face(RF), flat face(FF) or Ring Type Joint(RTJ) , the long weld neck flange is suitable to be used for the high pressure application. The long weld neck flange could be in many materials, carbon steel ,alloy steel or stainless steel .Hebei haihao group can supply the long weld neck flange as per customers’ requirements. The NW Long Weld Neck Flange is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The NW Long Weld Neck Flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design. NW Long Weld Neck Flange Tube OD sizes: 3/8 to 2 inches Materials: Flange: 304 or 316L stainless steel O-rings: Viton, Buna, & silicone Fasteners: Wingnut, SureSeal, bulkhead & EVAC clamps Vacuum range Elastomer seal: >=1 x 10^-8 Torr – High vacuum EVAC metal seal: >=1 x 10^-11 Torr – UHV Temperature range Viton: -20°C to 200°C Silicone: -50°C to 230°C Buna: -30°C to 110°C EVAC metal seal: -270°C to 150°CProduct name: long weld neck flange Size ½” (15 NB) to 36″ (900NB)Class  150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS MaterialGrade Stainless Steel  ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L  Duplex Steel   ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61  Alloy Steel ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91  Carbon Steel ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70In FormSORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etcSpecializeAs per drawing Value Added Services» CNC Machining  » Customized FlangesStandard » ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 » DIN :  DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673 » B.S : BS4504 , BS4504, BS1560, BS10

What is blind flange? A blind flange is a round plate which has all of the relevant blowholes except center hole, and because of this feature the blind flange is usually used to close off the ends of a piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened. Without the blind flange it would be difficult to perform maintenance or repairs on a pipeline. The flow would need to be shut off at the nearest valve, which could be miles away from the repair area. Valves are also very expensive and are prone to sticking. The blind flange is a much more cost efficient way of sealing a pipe. Blind Flanges are commonly used in petrochemical, pipe engineering, public services and water treatment etc. A blind flange (BF) is a piping component for covering or closing the end of a pipe, valve, vessel or tank. When used at the end of a pipe, vessel or tank, it provides an easy open access for further extension of the pipe. Because the blind flange’s sole purpose is to contain the pressure of the pipe, it (and its bolts) are stressed more than any other flange. Blind flanges, abbreviated as BV, are commonly used in any industries that utilize piping. They are available in all face types (RTJ, Raised and Flat Face) at all pressure ratings. A blind can be inserted between two flanges to block flow but this isn’t good practice in most piping. When trying to block flow temporarily in a pipe, the designer should use a spectacle blind instead. A blind flange would be used at the end of a valve to ensure the accidental opening of a valve will not cause an escape of the process fluid. When designing a piping system for expansion, a blind flange can be used to allow for bolting on piping when the expansion is completed. This design allows for expansion or continuation of the pipeline by simply adding onto the final flange. If used on a manifold in dirty service a blind flange can be used by the operations and maintenance staff to clean out or inspect the piping during a shutdown. When placing a blind flange on a vessel man way, consider how it will be removed. It may require the addition of a lifting eye for a crane or a specially designed davit to hold the flange in place after the bolts are removed. Care should be taken in that the davit must be designed to be able to hold the entire weight of the flange. A blind flange is a solid disk used to block off a pipeline or to create a stop. It is machined in the same manner as a regular flange with the mounting holes around the perimeter and the gasket sealing rings machined into the mating surface. The difference is that a blind flange has no opening to allow fluid to pass through. The blind flange can be inserted between two open flanges and used to block off the flow of liquid through a pipeline. Often a blind flange is inserted into a pipeline when a repair is required further up the line. This allows the flanges down stream to be disconnected without fear of losing liquid. Many times this type of blockade is used when adding another line onto an existing pipeline or when a new valve is being added. This blockade is also used to shut down a line when it is no longer needed. Without the blind flange it would be difficult to perform maintenance or repairs on a pipeline. The flow would need to be shut off at the nearest valve, which could be miles away from the repair area. Valves are also very expensive and are prone to sticking. The blind flange is a much more cost efficient way of sealing a pipe.Product name : blind flange A Blind Flange is a Flange which has no bore hole and consequently it is used to close the end of a piping system. The Blind Flange is sometimes machined to accept a pipe of the nominal size to which reduction is being made. The Blind Flange reduction can be either threaded or welded. A Blind Flange also allows easy access to a line once it has been sealed. Size ½” (15 NB) to 48″ (1200NB)Class  150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. MaterialGrade Stainless Steel  ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L  Duplex Steel   ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61  Alloy Steel ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91  Carbon Steel ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70In FormSORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etcSpecializeAs per drawing Connection TypeRaised Face, Flat Face, Ring Type Joint, Lap-Joint Face, Large Male-Female, Small Male-Female, Large Tongue & Groove, Small Tongue & Groove Standard ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN Standards, Dimensions & Weight of Blind Flanges DIN 2527 PN6 Blind Flange DIN 2527 PN10 Blind Flange DIN 2527 PN16 Blind Flange DIN 2527 PN25 Blind Flange DIN 2527 PN40 Blind Flange DIN 2527 PN64 Blind Flange DIN 2527 PN100 Blind Flange EN 1092-1 PN6 Type 05 Blind Flange EN 1092-1 PN10 Type 05 Blind Flange EN 1092-1 PN16 Type 05 Blind Flange

Connection mode of high pressure pipeline is the main thread, flange connections and welded connections two. The interface processing shall be made in cold machining, achieve the interface size specification. In general, the lathe bed and cone tube processing lathe, welding method can be used for manual processing interface. High pressure stainless steel pipe fittings’ pipe end of thread on the machining accuracy requirements are higher, meet the requirement of precision and the surface is bright and clean degree to reach more than 75], the tube end sealing cone (20 degrees plus or minus 30 DEG) surface finish to more than 76%], does not allow any scratch, scratch, cavities and other defects. The sealing surface with the center line and the concentric lens gasket sealing line (often called the DK line) to be accurate. Pipe end processing should be carried out to check the thread in the thread angle, tooth shape and so on should meet the requirements. There is no crack or burr on the surface of the thread. The teeth are not complete and minor mechanical damage should not be more than 1/3 circle thread. To reduce the height of thread should not exceed the nominal height of 1/5. Finally by the use of magnetic particle inspection pipe end, not allowed to crack, the cleaning after coated with lubricating oil, it is best to use cover protection, can also be equipped with flanges protection. The processing for the straight pipe end, and cold-formed stainless steel pipe fittings, stainless steel pipe or central heat bend without heat treatment of high pressure pipe and the elbow, the elbow can before the pipe thread lathe. Stainless steel pipe of hot bending to do the overall heat treatment, and the closed pipe (including cold and hot bending) and pipe end processing must be performed after forming, it must be in town bed processing stainless steel pipe end, hit the bed file of pipe end thread is difficult, but doing so can ensure installation quality of the high pressure pipeline.

Reasonable material size determines the role of steel in the process of pressing and deformation. Some deformation characteristics of large diameter high pressure stainless steel pipe fittings: (1) large diameter high pressure stainless steel pipe fittings in the bending of the outer wall of the arc tube: Lane, the inner arc tube wall is compressed, its tensile and compression is not the same, generally bear the difference between three to two times. Tensile rate for 10-11%, the compression rate is 4%, such as phi 406.4 x 40 mm of steel tube tensile rate is 11%, while the compression rate was 2.5%; phi 355.6 x 36 mm pipe tensile rate is 11%, the compression ratio for 2.30% phi 323.9 x 36 mm pipe tensile rate is 10%, compression rate of 2.5%. It shows that the deformation characteristics and other stainless steel tubes are not the same in the pressing process of large diameter high pressure stainless steel pipe fittings. (2) the large diameter and high pressure pressing stainless steel pipe fittings has a larger tensile rate than the small diameter high pressure stainless steel pipe fittings, and the compression ratio is small. For example: Phi 406.4 x 40 mm carbon steel, alloy steel, stainless steel, pipe fittings and phi 355.6 x 36 and phi 323.9 x 36 mm of high pressure stainless steel fittings, although different diameter, different materials, but their tensile rate for 11%, the compression rate is 2.5%. But for small diameter and thick wall pipe stainless steel high pressure pipe fittings, such as Phi 273 x 25 mm, the tensile rate of only 3.5%, compression rate is 2%, such as: Phi 406. X 40 mm stainless steel pipe fittings’ tensile rate is 11%, indeed somewhat difference, the reason is the small caliber, ‘the wall thickness is not easy to stretch. (3) the tensile rate and compression ratio of large diameter high pressure stainless steel pipe fittings are equal to that in hot pressing. Such as phi 406.4 x 40 mm 45 carbon steel, stainless steel pipe fittings and 12CrMoV alloy steel stainless steel pipe fittings, the tensile rate for 11%, compression rate is 2.5%, and phi 355.6 x 25 mm 45 carbon steel, stainless steel pipe fittings and phi 355.6 * of 22.2 mm in 12 Cr-l4oV synthetic steel stainless steel pipe fitting the stretching rate is very close to, 10-11%.