[플랜트교육] Weldolet 용접 방법 쉬운 이해~!!! (5분 순삭)

Olet® : 미국 보니 포지(Bonney Forge) 등록상표
Manufacture Code
ASME B16.9 Factory-Made Wrought Buttwelding Fittings&
ASME B16.25 Butt Welding Ends
Installation Code
ASME B31.1 Power Piping
ASME B31.3 Process Piping
ASME B31.4 Pipeline Transportation Systems for Liquids and Slurries
ASME B31.8 Gas Transmission and Distribution Piping Systems
PIPE BRANCH FITTINGS
Pipe branch fittings are used to create integrally reinforced connections from a run pipe (header pipe) to an outlet pipe, at 45 or 90 degrees, alternatively to connections made with buttweld tees, reinforcing pads and saddles. This type of forged fittings are otherwise called “branch connections”, or “branch fittings”, or “pipe branch outlet fittings” or, simply, “Olets”.
Outlet fittings are forged products with high strength and clear cost advantages over conventional pipe branching techniques.
How are they installed? Quite easily: on one side, the fittings (example a Weldolet) is fixed onto the run pipe with a full penetration groove weld and, on the other side, welded (or screwed) on the branch pipe. Of course, the header pipe shall be properly cut in the proximity of the area where the pipe needs to be branched.
The use of branch fittings instead of conventional fittings (buttweld tee, reinforcing pads and saddles) has the following advantages (example Weldolet):
Just 2 welds are needed, instead of 3 (less work and weld inspections)
Accelerated installation time
Less space is required, making the piping system design more flexible
The flow is fully unrestricted, due to the funnel design
Reinforced branch connections are manufactured in a wide range of sizes (to accommodate most size on size or reducing connections), types/designs, connection types (buttweld, socket weld, threaded), and in a wide range of forged steel materials:
carbon steel (ASTM A105 for high-temperature, A350 LF2/LF3 for low-temperature)
alloy steel (ASTM A182 Grades F5, F9, F11, F22)
stainless steel (ASTM A182 F304, F316, and other SS grades)
nickel alloys (Inconel, Monel, Incoloy, etc).
The MSS-SP 97 specification covers the dimensions, the finishing, the tolerances, the testing methods and procedures, the marking, the material grades, and the minimum tensile strength requirements for 90-degrees integrally reinforced forged branch outlet fittings (welded and threaded). The connection resulting from using branch fittings complies to ASME B31.1 and ASME B31.3 power and process piping codes.
The types of ends of an outlet fitting shall comply to ASME B16.25 (buttweld ends), or ASME B16.11 (socket weld and threaded ends).
What is Weldolet
Weldolet is the most common among all pipe olet. It is ideal for high pressure weight application, and is welded onto the outlet of the run pipe. The end are bevelled to facilitate this process, and therefore the weldolet is consider a butt weld fitting.
Weldolet is a branch butt weld connection fitting that is adhered to outlet pipe to minimizes stress concentrations. And it provides overall reinforcement.Normally it has the same or a higher schedule than the run pipe schedule, and offers a variety of forged material grades, such as ASTM A105, A350, A182 etc.
Differences between Weldolet, Sockolet, Threadolet
The mainly differences are the connection surface, weldolet ends in plain or beveled to weld on the the branch pipe, sockolet ends in socket type that to insert branch pipe. Threadolet is insert branch pipe and with screw connection. So they have different advantages:
Weldolet: Compatible with higher pressure and simple connection, cost lower. Thickness in SCH STD, SCH XS, SCH 160 to SCH XXS.
Sockolet: Compatible with higher pressure but cost is higher. Pressure ratings in 3000#, 6000#.
Threadolet: Easy to replace and maintain, cost is higher. Pressure ratings in 3000#, 6000#.
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