What is MSS SP-83 standard?
Forged carbon and stainless steel pipe unions, socket welding, and threaded ends must meet the criteria of MSS-SP-83 in terms of dimensions, finish, tolerances, testing, marking, material, and minimum performance.
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There is no mention of unions in the B16.11 standard. MSS SP-83 is the relevant industry standard for pipe unions made of forging and bar stock. According to MSS sp-83 union, socket weld ends.
This Standard Practice specifies minimum performance standards for forged carbon steel, alloy steel, titanium, nickel alloy, and stainless steel.
MSS sp-83 standard active pipe connection fitting called a threaded union has the advantage of being simple to construct and remove. It is generally applicable for connecting pipelines of various sizes and meters and valves to pipelines. A complete union should typically include three components: a male end, a female end, and a nut.
Socket weld and threaded union are listed in the MSS SP-83 manufacturing standard which covers essential dimensions, finishes, tolerances, testing, marking
What finishes, tolerances, testing specified for mss-sp-83 union?
This Standard Practice sets specifications for the position of the socks’ bottoms to ensure constructed union homogeneity. To create a level surface against which to weld, MSS-sp-83 union threaded must face ends at a right angle to the axis. The socket must be counterbored or machined to ensure uniform depth and circularity.
It is advised that the connecting pipe is drawn approximately 0.06 inches away from the bottom of the union socket bore before welding to reduce the likelihood of cracking the filet welds.
Surfaces must be finished with a workmanlike appearance and be devoid of sharp burrs.
- Concentricity: For all diameters, the socket must be concentric with the canal bore within plus or minus 0.03 inches.
- Axis Coincidence: The most incredible allowable difference in the alignment of one threaded pipe end of the constructed
union to the axis of the opposing threaded pipe end should not be more remarkable than O. 19 in. in 1 foot.
Forging solid steel, followed by heat treatment and dimensionally accurate machining, is used to create forged pipe fittings. Larger piping systems often employ buttweld pipe fittings in accordance with MSS sp-83 standard union.
MSS SP-83 standard applies for class 3000 / cl 6000 union in various materials such as carbon steel, alloy steel, stainless steel, and nickel alloys
Which are the materials which comes under mss-sp-83 socket weld union manufacturing specification?
Forged carbon and stainless steel pipe unions, socket welding, and threaded ends must meet the criteria of MSS-sp-83 threaded union in terms of dimensions, finish, tolerances, testing, marking, material, and minimum performance.
Several types of unions include socket weld, threaded, male x female, socket weld x female, butt weld, and lug nut.
ASTM A105, ASTM A182, F304, F316, F304L, F316L, and A182 F5/F9/F11/F22/F91 are among the most popular materials of MSS-sp-83 socket weld union. For tiny-size pipes and plumbing systems, socket weld and threaded fittings are typically employed (generally below 4 inches in diameter for Class 3000 and below 2 inches for fittings in class 6000 and 9000). Forging solid steel, followed by heat treatment and dimensionally accurate machining, is used to create forged pipe fittings.
The criteria covered by this Standard for ASME B16.11 standard include tolerances, ratings, dimensions, labeling, and material specifications.
The specification includes specifications for threaded forged fittings and criteria for socket welding. For socket-weld end fittings, the SS 310 Socket weld Union fittings are categorized as Class 3000, 6000, and 9000.