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What is threaded half coupling? A threaded half coupling means a steel coupling which only has one thread end, another end of the coupling should be butt welding end. The thread end could be NPT or BSP standard thread. The butt welding end could be a plain end or a bevel end. it could be the connection between a pipe of male thread end and a pipe of no thread end. When installing this coupling in site, the ends should be in correct direction. Standard: ASME B16.11 ,Class3000/Class600, BS EN10241 Material: Available in a complete range of Carbon Steels, Stainless Steels, Alloy Steels and Non-ferrous metals certified to ASTM, ASME, and Military standards. Sizes: 1/8”- 12” in Class 3000 and 1/8”- 8”in Class 6000 Also available in 1/8 – 8” in 150 # and 1/8”- 4” in Class 9000 and in special lengths Threads: American National Standard Taper Pipe Threads NPT (ANSI/ASME B1.20.1-1983) Also available in other thread forms: NPTF, NPSC, BSPT, BSPP and in any combination. Left hand threads available upon request. MATERIALS:  Stainless Steel Threaded Half Coupling – SS Threaded Half Coupling  ASTM A182 F304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L Duplex Stainless Steel Threaded Half Coupling – Duplex SS Threaded Half Coupling ASTM / ASME A/SA 182 UNS F 44, F 45, F51, F 53, F 55, F 60, F 61. Carbon Steel Threaded Half Coupling – CS Threaded Half Coupling ASTMA 105/A694/ Gr. F42/46/52/56/60/65/70 Low Temperature Carbon Steel Threaded Half Coupling  – LTCS Threaded Half Coupling A350 LF3/A350 LF2 Alloy Steel Threaded Half Coupling – AS Threaded Half Coupling ASTM / ASME A/SA 182  F1/F5/F9/F11/F22/F91 Nickel Alloy Threaded Half Coupling  : Standard: ASTM / ASME SB 564 / 160 / 472. UNS 10276 (HASTELLOY C 276 Forged Elbow) UNS 2200 (NICKEL 200 Forged Elbow ),  UNS 2201 (NICKEL 201 Forged Elbow ),  UNS 4400 (MONEL 400 Forged Elbow ),  UNS 8020 (ALLOY 20 Forged Elbow ) UNS 8825 INCONEL 825 Forged Elbow ),  UNS 6600 (INCONEL 600 Forged Elbow ),  UNS 6601 (INCONEL 601 Forged Elbow),  UNS 6625 (INCONEL 625 Forged Elbow), Copper Alloy Threaded Half Coupling ASTM / ASME SB 61 / 62 / 151 / 152. C 70600 (CU -NI- 90/10) – Cupro Nickel Forged Elbow  C 71500 (CU -NI- 70/30) – Copper Nickel Forged Elbow  UNS NO. C 92200, UNS NO. C 83600, UNS NO.  UNS NO C 10100, C 10200, C 10300, C 10800, C 12000, C 12200 DIMENSIONS OF ASME B16.11 THREADED HALF COUPLING Dimensions threaded Half couplings – NPS 1/2 to 4 – 3000 LBS – ASME B16.11NPS End to EndOutside DiameterMinimum Length of ThreadADBJ1/2482810.913.63/4513512.713.91604414.717.31¼675717181½796417.818.4286761919.22½929223.628.9310810825.930.5412114027.733 Dimensions threaded Half couplings – NPS 1/2 to 4 – 6000 LBS – ASME B16.11 NPS End to EndOutside DiameterMinimum Length of ThreadADBJ1/2483810.913.63/4514412.713.91605714.717.31¼676417181½797617.818.4286921919.22½9210823.628.9310812725.930.5412115927.733

Piping installation must be checked before the stainless steel pipe fittings, pipe fittings and support, preparation of the materials. Including the quantity, material, processing quality, as well as internal anti-corrosion lining and cleaning quality. The valve, especially the safety valve are subject to unpick and wash, such as inspection, testing, adjust the qualified. To install the scene to conduct a survey at the same time, to clear up the location of the pipe laying, if a bracket parts and various construction conditions. Such as wear wall, the roof of the hole with and without good, hoisting tools and scaffold preparation, etc. For the installation site has transport inflammable, explosive medium line and belongs to the fire area construction, must make relevant safety measures, go through the formalities when hot. In piping installation and maintenance, in addition to the design location specified on drawing, also should consider the following points, make the pipe laying more reasonable: When the stainless steel pipe has a variety of line height is arranged on the pipe rack. General heat pipe road, a small diameter pipe, should be no corrosive medium in the pipeline and gas pipeline laying in upper part, and the high pressure pipe fittings and stainless steel need to check the piping should be equipped in the position of easy to check and repair. When horizontal arrangement, usually large pipes, stainless steel pipe fittings at room temperature and the weight is bigger, stronger vibration line should be located in or close to a wall bracket stigma. The relative distance between pipe and stainless steel pipe fittings, shall be installed in order to facilitate maintenance. Heat preservation and valves and other something for easy setting for the principle. General line highlights (such as bone, non-standard flange, the outer wall, outside wall insulation layer, is apart from the wall or column about the gap, about 100 mm: highlights of clearance between stainless steel pipe fittings can be in 40 ~ 90 millimeter, installation of two valves, side by side clearance between the wheel rim should people in 100 mm.

What is threaded pipe cap Threaded pipe cap is the threaded pipe fittings designed to be the ends of a piping. it is used to block off the end of a piping system by placing the cap over the open pipe. It is commonly made from the steel plate, in standard ANSI/ASME B16.9,the cap is butt welding ends, it is welded with the open pipe. ASME B16.11 / BS3799 Threaded Pipe CapSizeClassRangeDimensionSpecification1/4″ to 4″2000, 3000, 6000, 9000Elbow, Tee, Nipple, Coupling, Plug, Socket, Bushing, Union, Welding Outlets, Socket Weld Outlets, Threaded OutletsANSI B 16.11ASTM A 182 END PREPARATION BEVELED END SQUARE END FLANGED END GROOVED END Nickel Alloy Threaded Pipe Cap ASTM / ASME SB 336 UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276) Copper Alloy Steel Threaded Pipe Cap ASTM / ASME SB 111 UNS NO.C 10100 , C 10200 , C 10300 , C 10800 , C 12000, C 12200, C 70600 , C 71500 ASTM / ASME SB 466 UNS NO.C 70600 ( CU -NI- 90/10) , C 71500 ( CU -NI- 70/30) Stainless Steel Threaded Pipe Cap ASTM / ASME SA 403 GR WP “S” / “W” / ” WX” 304 , 304L, 304H, 304N, 304LN, 309, 310H, 316, 316H, 317, 317L, 321, 321H, 347, 347 H Duplex Steel Threaded Pipe Cap ASTM / ASME SA 815 UNS NO.S 31803, S 32205, S 32550, S 32750, S 32760 Carbon Steel Threaded Pipe Cap ASTM / ASME A 234 WPB, WPC ASTM / ASME A 860 WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70 Alloy Steel Threaded Pipe Cap ASTM / ASME A 234 WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 23, WP 91 Types : Forged Elbow, Forged Tee, Forged Reducer, Forged Return Bends, Forged Stub-Ends, Forged Cap, Forged Collar, Forged Cross, Forged Insert etc. Threaded End Caps Size : 1/2” NB TO 24” NB. ( 1/8″ to 4″ class 3000 & 6000 threaded ) Class 3000 1/81/43/81/23/411 1/41 1/222 1/234B3/43/47/81 1/81 3/81 3/42 1/42 1/233 5/84 1/45 1/2D15/16111 1/41 7/161 5/81 3/41 3/41 7/82 3/82 9/162 11/16 Class 6000 1/81/43/81/23/411 1/41 1/222 1/234B7/811 1/41 1/21 3/42 1/42 1/233 5/84 1/456 1/4D11 1/1611 5/161 1/21 11/161 13/161 7/822 1/22 11/162 15/16

A welding joint is a point or edge where two or more pieces of metal or plastic are joined together. They are formed by welding two or more workpieces (metal or plastic) according to a particular geometry. Five types of joints referred to by the American Welding Society: butt, corner, edge, lap, and tee. These configurations may have various configurations at the joint where actual welding can occur. There are four basic joints used in arc welding: •Butt joints •Tee joints •Lap joints •Corner joints Each welding joint has several variations to provide for different needs. Two different types of welds are used when welding these joints. The groove-type weld (butt weld) fills in grooves that are cut on the inside of two pieces of metal that are positioned next to each other. The fillet-type weld fills in space on the outside of pieces of metal that are positioned at an angle to each other. Butt welded joints A Butt Weld is a circumferential butt welded joint, and the most common type of joint employed in the fabrication of welded pipe systems. A butt joint is the most universally used method of joining pipe to itself, fittings, flanges, Valves, and other equipment. This welding technique is widely applied in situations where a quality weld desired, and the weld by X-ray technically should be investigated. When the material to be welded exceeds 3/16″ in thickness, the ends of pipes, fittings and flanges must be chamfered at approximately 37.5°, flared on a small upright side (Root face); in practice we talk about the Welding Bevel. The most used bevels are the “Plain bevel” from wall thicknesses (t) 4 to 22.5 mm, and the “Compound bevel” for wall thicknesses above 22 mm. ASME B16.25 covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and dimensional tolerances). These weld edge preparation requirements are also incorporated into the ASME standards (e.g., B16.9, B16.5, B16.34). During the prefab from a pipe on a elbow e.g., a “Gap” of approx. 3-4 mm should be created, to obtain a proper weld penetration. The images below shows 3 examples Fig.1  A correct preparation and right gap, creates a proper penetration. Fig.2  A narrow gap, may be causes a hollow penetration. Fig.3  A large gap, may be causes a too heavy penetration. Fillet welded joints Fillet welded joints such as tee, lap and corner joints are the most common connection in welded fabrication. In total they probably account for around 70 to 80% of all joints made by arc welding. No edge preparation is needed and assemblies in piping systems are simpler. Therefore, fillet welds are usually cheaper than butt welds. In pipe systems fillet welded joints are generally used for joining pipe to socket joints in sizes NPS 2 and smaller, and in systems where Slip On flanges will be used. The image below illustrates typical fillet welded joints in a Socket Weld pipe system. ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says: In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16″ (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket. The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal, and to allow for differential expansion of the mating elements. The disadvantage of a Socket Weld system is right the expansion gap and the space between the OD of the pipe and the ID of the fitting. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange, fitting or Valve can give corrosion problems. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion. In service applications, where complete weld penetration to the inside of the piping is required, socket welds are not acceptable, and generally butt welds must be made.

Spigot and socket jointing systems are commonly used for low and medium pressure steel pipelines but for potable water systems where an internal epoxy coating is required, the external fillet weld invariably damages the internal lining. The Steel Water Pipe E-Joint overcomes this problem because it includes an air pocket which drastically reduces the heat transfer to the internal surface.

What is flanged joint? A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. A flange joint is a non-permanent, removable method of joining or blanking off steel and plastic pipes. Flange joints consist of a pair of identical discs with a row of attachment holes close to their outer circumference. When two pipes are to be joined, the two discs are placed against each other in such a way that the holes line up. Bolts are then passed through the holes and tensioned, thus pulling the flanges against each other firmly. Flanges are available in a range of designs including slip-on flanges, raised face flanges, and lap joint flanges all of which suit differing pipe system requirements. The flange joint is one of the most convenient and efficient removable pipe joining and blanking systems in common use. Flange joints are suitable for a range of pipe designs, materials, and sizes and are commonplace on systems as perse as large municipal water mains and small high pressure steam lines. Flange joints are quick to assemble and disassemble and may be included on stock pipe lengths or installed in-situ on existing pipe circuits. The flange joint allows for quick and effective connecting of pipe sections and for joining sections of piping to ancillary equipment such as pumps, valves, and metering devices. The wide range of types also means that there is a flange joint suitable for most transported mediums.

Socket weld joint is suitable for any potable water or sewage sludge pipeline. Ideal for all soil types due to complete corrosion protection.

From time to time in different special stainless steel pipe fittings installed will be the actual value compared with the theoretical value and pay attention to the deviation. Special stainless steel pipe fittings, for example, is generally can’t adjust the size of the deviation, balance only by the installation of pipes. At the same time for the part of the pipe hanger and installation location, for example. Need to tilt the installation position to pay attention. According to design of pipeline implementation of cold drawn prestressed data. Before cold drawn, the piping should be as far as possible in the condition of no additional stress. This can be from all stages of the installation process of cross plane measurement data of the comparison to judge. The installation work of the whole stainless steel pipe fittings and pipe insulation is completed, under the conditions of not loosen the spring hanger pipe measuring its actual location. Measure hanger loose again later. To check the position indicated by the constant force spring hanger, it should be consistent with the prescribed cold position. To make cold and hot state position respectively. If piping position, weight, balance and the location of the pipe hanger large deviation occurs, it is necessary to use the measured value of the whole piping system to calculate again. To determine whether to allow a larger deviation, advice when necessary in the installation phase review for the piping system is calculated. Before put into trial shipment is to be a pipe running under the weight of cold measurement, running hot and cold start-up after the measurement. The piping of the cold, hot and cold compared with the theoretical value, the location of the measurement data for analysis of piping system state. Which can be derived under basic load condition, for high stress and complicated components, stress and strain measurements made at the same time, in order to calculate the relay, connection moment and cause of the size of the stress. After a long interval for piping location survey, to provide whether displacement took place in the piping system.

What is a Pipe Union? A pipe union is a secure and semi-permanent connection between two pipes. Most pipe unions consist of two pipes connected together via a third piece. All three are threaded to make a firm connection. While unions are similar to couplings, they are generally easier to take apart and allow pipes of different metals to come together safely. This joining method is common in household and commercial pipe systems. At first glance, a pipe coupling and a pipe union seem very similar. They both connect two pipes together using a male and female threading system. The main difference between the systems comes from the actual method of joining. Two coupled pipes screw together directly, one inside the other. To take the pipes apart, every pipe that connects to the coupled pipe needs to turn. In a full pipe system, this would mean the entire system needs to come apart to remove one pipe. With a pipe union, the two pipe ends don’t screw into one another—they each screw into a third piece. When one pipe needs to come apart from the other, the union piece simply screws onto one of the two pipes completely. If both ends of a pipe are attached using a union, the pipe may be removed on its own without unscrewing the other pipes in the system. Pipe Union is a type of fitting equipment designed in such a way to unite two pipes which can be detached without causing any deformation to the pipes. Any kind of small diameter piping connections requiring a positive seal and easy assembly as well as disassembly are made with the help of pipe union. In other words, the pipe unions can disjoint two pipes very easily. They are widely demanded in the pipe fitting market. Materials used: Stainless steel Cast iron Aluminum Nickel Copper Brass Bronze Alloy Plastic Rubber etc. Three parts of pipe union: A nut A female end A male end With the joining of the female and male ends, the nuts are used to provide the necessary pressure to seal the joint. The parts of the pipe union are normally locked together by at least one radial screw or nut with sized cross section. When severe pulling stress is applied onto the pipe union from the outside, the locking screw breaks and removes the two parts of the union, which in turn separates together with the pipes to which they are attached. Under normal conditions elastically stressed sealing objects ensure maintenance of watertightness between the union parts. Types of pipe unions: There are two basic types of pipe unions: Ground Joint Union Flange Union The difference between the two is that the former consists of three pieces while the latter two pieces. Applications of pipe unions: Pipe unions are used in various municipal and industrial applications like as follows: Fire protection Process piping system Water and wastewater etc. Advantages of pipe union: There are various advantages of pipe unions like: To provide a leak-proof disconnection point in any piping system. Used for inserting metering and regulating devices into any plumbing application. Can connect piping system to vessels. Can join two pipes of different size together. Can easily remove the join between two pipes. Easy to install. Economical.

What is threaded union? Threaded union is primarily used for maintenance and installation purposes. It is a screwed joint design and it consists of three interconnected pieces. Two internally threads and a centerpiece that draws the ends together when rotated. SizeClassDimensionSpecification1/4″ to 4″2000, 3000, 6000, 9000ANSI B 16.11 ASTM A 182 ASME SA182 Stainless Steel Threaded Union ASTM / ASME SA A182 F304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L Carbon Steel Threaded Union ASTM/ ASME A 105, ASTM/ ASME A 350 LF 2 Alloy Steel Threaded Union ASTM / ASME A182 F1/ F5/ F9/ F11/ F22/ F91 Nickel Alloy Threaded Union ASTM / ASME SB 336 UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276) Copper Alloy Steel Threaded Union ASTM / ASME SB 111 UNS NO. C 10100 , C 10200 , C 10300 , C 10800 , C 12000, C 12200, C 70600 , C 71500 ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10) , C 71500 ( CU -NI- 70/30) Duplex Steel Threaded Union ASTM A 182 – F 51, F53, F55 S 31803, S 32205, S 32550, S 32750, S 32760 1/8″ to 3 ” class 3000 and 1/2″ to 2″ class 6000Class 3000 1/81/43/81/23/411 1/41 1/222 1/23A1 11/161 11/161 27/3222 5/162 7/162 7/833 1/24 1/24 7/16B1 31/641 31/641 11/161 15/162 3/82 25/323 23/643 23/324 27/645 15/646 5/32C53/6453/6411 3/161 15/321 25/322 7/322 35/643 1/163 9/164 9/32D25/3225/3231/321 3/321 5/321 3/81 45/641 7/82 1/162 3/82 7/16E7/167/167/167/169/169/169/169/1611/167/81F0.4200.5550.6900.8551.0651.3301.6751.9152.4062.9063.535 0.4300.5650.7000.8651.0751.3401.6851.9252.4162.9213.550 Class 6000 1/81/43/81/23/411 1/41 1/22 A1 11/151 27/3222 5/162 7/162 7/833 1/24 1/8B1 31/641 11/161 15/162 3/82 25/323 23/643 23/324 27/645 15/64C53/6411 3/161 15/321 25/322 7/322 35/643 1/163 9/16D25/3231/321 3/321 5/321 3/81 45/641 7/82 1/162 3/8E7/167/167/169/169/169/169/1611/167/8F0.4200.5550.6900.8551.0651.3301.6751.9152.406 0.4300.5650.7000.8651.0751.3401.6851.9252.416Note: “C” dimension is across octagon corners or a diameter as applicable.The 2.1/2″ and 3″ 3000LB and 2″ 6000LB sizes have octagonal male and female ends; the other sizes are round.

The middle of the lateral tee gives off a branch, lateral tee back surface bend diameter for axb known, the arc radius; R = a, back arc radius R = T + a; Axb branch pipe diameter. I) delimit view: (1) according to the known size in order to draw the elevation and plan; (2) according to the back of the center of the branch (position in A ‘B’ center line overlap) delimit the vertical pipe, and make A branch of elevation, branch of oral sex to bend back arc surface G ‘H’; (3) according to the projection relationship before you make a branch in the lateral tee plan vertical view, a quick rectangular E1, F1, F2FE2. Row graph: 1) lateral tee’s sides is on elevation; (2) the inclined tee back: draw a rectangle width for b, length of back arc DB unbend, namely PI R / 2; According to the actual location of the branch pipe in the back arc, the symmetry line measuring HG curve contour length point H and G; H ‘and the G’ as a parallel lines, and a wide for b ‘, namely complete back arc expansion plan and the opening position and size. (3) branch: as a baseline, take its length is equal to the straight pipe section, and have been in accordance with the vertical view each dot notation M – E2 – F2 – F1 – E1 – M, and through the above each point as a baseline of vertical (parallel) each wire; In each line intercept the actual length of the line segment, linear parts direct attachment; By curve part with a radius of R, G, H and H, point to delimit circle arc, intersection point 0; To zero as the center of the circle, the radius R, GH, lateral tee expansion plan is completed.

What is threaded nipple? Threaded nipple is a length of straight pipe with male threads on both ends. It is one of the most popular category of pipe fittings. It is a connector or a coupling threaded on both ends. threaded nipples are used to allow plumbing to be connected to a water heater or other plumbing. They are used to fit straight end hose or pipe. A combination of threaded nipples are recommended for low-pressure discharge and suction service for various compatible liquids and not for compressible products like air, nitrogen or steam. Both end Threaded Nominal DiameterOutside Diameter DSch40 STD Sch80 XSSch160 XXSL(mm)DNNPS81/413.5○ 60 90 120 150 180103/817.2○ 151/221.3○○203/426.7○○25133.4○○321.1/442.2○○401.1/248.3○○50260.3○○CarbonSA234 WPB, SA234 WPC,SA42 WPL6, SA42 WPL3, WP1. MSS-SP75  WPHY,WPHY 46,WPHY 52,WPHY 56,WPHY 60,WPHY 65, WPHY 70  DIN 1629 St37, RST37.2 St52StainlessASTM/ASME SA403 304,304L ,316, 316L, WP304L, 3 WP316 WP347 (H) ,WP317 (L),WP321. DIN 1.4301, 1.4306, 1.4401, 1.4571  JIS SUS304,SUS304, SUS304L, SUS316, SUS316Alloy ASTM/ASME SA234 WP12, WP11,WP22, WP5, WP9, WP91. ASTM B361 GR.3003-6061,  ASTM B366 UNS N04400,N08800, N08825 N1001-N10276-N10665, WPT2-WPT12. ASTM 182 F1, F5, F6, F7, F9, F11, F12, F22, F51. 16MnR Cr5Mo 12Cr1MoV 10CrMo910 15CrMo 12Cr2Mo1, St45.8OthersCopper, Aluminium,Brass,Titanium, Nickel,Nichrome, Al.Bronze Phosphorous Bronze