We received a inquiry by a new customer from Australia about SS316 union. The size is DN25 and DN50,the pressure is class 3000.
The type of union is socket weld or threaded. So I attached the specification of SW and THD union for the client’s reference. But the client replied that they need the BW SS316 union. After checked with our engineer, we issued a drawing of BW union for the client.
The client is satisfy for our positive reply, and place the order one month later.
MSS SP-83 Union Specification
MSS SP 83 is the specification for Class 3000 SS316 union. This standard covers size tolerance, marking,material and minimum performance requirements for forged carbon and stainless steel pipe unions, socket-welding and threaded ends.
We produces high pressure forged fittings for connecting pipes or other fittings together in many industrial processes that no leakage can be permitted. And limited by its manufacturer standard, it is more suitable for small diameters application below 4 inch.
Class 3000 SS316 Union have excellent corrosion resistance and high strength so that they are high demanded in chemical industries such as pulp and paper mills. SS316 union is solid and lasting, even in the most demanding circumstances, they can perform well.
| Size: | 1/4″ to 4″ ( DN6 to DN100) |
| Pressure Rating: | Class 3000 |
| Standard: | MSS SP-83 |
| Type: | Socket Weld Union and Threaded Union |
| Carbon Steel | ASTM A105 / A105N, ASTM A350 LF2/LF3, A694 F42 / 46 / 56 / 60 / 65 |
| Alloy Steel | ASTM A182 F11 / F12 / F5 / F9 / F91 / F92 / F22 |
| Stainless Steel | ASTM A182 F304/304L/304H, F316/316L, F310S, F317, F347, F904L |
Package of SS316 Union
Marked socket weld fittings with Size, Pressure, Grade, Standard and Heat No.
Packed SS316 union in carton and wooden cases, then bundled packages with nylon rope.
Stick shipping mark on the outside of the package for easy identification.
Inspection of Class 3000 Union
Visual the surface of SS316 union body.
Check the marking ” DN25 BW Union 3000# SS316 HEAT NO.236″
Measure dimensions of class 3000 union. Such as diameter, thickness, and size of the SS316 union.
CLASS 3000 Threaded Union Dimensions
| Nominal Size | Pipe End | Wall | Bone | Male Flange | Nut | THRD Per Inch | Bearing | Length Assem | Clear Assem Nut | |
| DN | NPS | A min | C min | D | F min | G min | H | J min | L nom | N |
| 6 | 1/8 | 14.7 | 2.4 | 8.4 | 3.2 | 3.2 | 16 | 1.2 | 41.4 | 51 |
| 6.4 | ||||||||||
| 8 | 1/4 | 19.1 | 3 | 11.1 | 3.2 | 3.2 | 16 | 1.2 | 41.4 | 51 |
| 9.4 | ||||||||||
| 10 | 3/8 | 22.9 | 3.2 | 14.3 | 3.4 | 3.4 | 14 | 1.4 | 46 | 56 |
| 13.5 | ||||||||||
| 15 | 1/2 | 27.7 | 3.7 | 17.9 | 3.7 | 3.7 | 14 | 1.5 | 49 | 59 |
| 17.1 | ||||||||||
| 20 | 3/4 | 33.5 | 3.9 | 23 | 4.1 | 4.1 | 11 | 1.7 | 56.9 | 66 |
| 21.4 | ||||||||||
| 25 | 1 | 41.4 | 4.5 | 29 | 4.6 | 4.4 | 11 | 1.9 | 62 | 79 |
| 27.7 | ||||||||||
| 32 | 1-1/4 | 50.5 | 4.9 | 37.7 | 5.3 | 5.2 | 10 | 2.1 | 71.1 | 94 |
| 35.4 | ||||||||||
| 40 | 1-1/2 | 57.2 | 5.1 | 43.5 | 5.8 | 5.6 | 10 | 2.3 | 76.5 | 112 |
| 41.2 | ||||||||||
| 50 | 2 | 70.1 | 5.5 | 55.6 | 6.6 | 6.4 | 10 | 2.7 | 86.1 | 132 |
| 52.1 | ||||||||||
| 65 | 2-1/2 | 85.3 | 7 | 66.3 | 7.5 | 7.1 | 8 | 3.1 | 102.4 | 150 |
| 64.3 | ||||||||||
| 80 | 3 | 102.4 | 7.6 | 82.6 | 8.3 | 8 | 8 | 3.5 | 109 | 176 |
| 77.3 | ||||||||||
Threaded SS316 Union Weight in KG
| NOMINAL SZIE | WEIGHT | |
| DN | NPS | 3000 |
| 6 | 1/8 | 0.25 |
| 8 | 1/4 | 0.3 |
| 10 | 3/8 | 0.35 |
| 15 | 1/2 | 0.46 |
| 20 | 3/4 | 0.61 |
| 25 | 1 | 0.85 |
| 32 | 1-1/4 | 1.35 |
| 40 | 1-1/2 | 2.85 |
| 50 | 2 | 4 |
| 65 | 2-1/2 | 4.9 |
| 80 | 3 | 7.1 |
MSS SP 83 Socket Weld Union Dimensions
| DN | NPS | A | B | C | D | E | F | G | H | J | K | L | N |
| 6 | 1/8 | 21.8 | 10.9 | 3.2 | 6.1 | 20.7 | 3.2 | 3.2 | 16 | 1.2 | 9.7 | 41.4 | 51 |
| 8 | 1/4 | 21.8 | 14.3 | 3.3 | 8.5 | 20.7 | 3.2 | 3.2 | 16 | 1.2 | 9.7 | 41.4 | 51 |
| 10 | 3/8 | 25.9 | 17.7 | 3.5 | 11.8 | 23.8 | 3.4 | 3.4 | 14 | 1.4 | 9.7 | 46 | 56 |
| 15 | 1/2 | 31.2 | 21.9 | 4.1 | 15 | 23.8 | 3.7 | 3.7 | 14 | 1.5 | 9.7 | 49 | 59 |
| 20 | 3/4 | 37.1 | 27.3 | 4.3 | 20.2 | 28.6 | 4.1 | 4.1 | 11 | 1.7 | 12.7 | 56.9 | 66 |
| 25 | 1 | 45.5 | 34 | 5 | 25.9 | 30.2 | 4.6 | 4.4 | 11 | 1.9 | 12.7 | 62 | 79 |
| 32 | 1-1/4 | 54.9 | 42.8 | 5.3 | 34.3 | 36.6 | 5.3 | 5.2 | 10 | 2.1 | 12.7 | 71.1 | 94 |
| 40 | 1-1/2 | 61.5 | 48.9 | 5.5 | 40.1 | 38.1 | 5.8 | 5.6 | 10 | 2.3 | 12.7 | 76.5 | 112 |
| 50 | 2 | 75.2 | 61.2 | 6 | 51.7 | 41.4 | 6.6 | 6.4 | 10 | 2.7 | 15.7 | 86.1 | 132 |
| 65 | 2-1/2 | 91.7 | 73.9 | 7.7 | 61.2 | 56.9 | 7.5 | 7.1 | 8 | 3.1 | 15.7 | 102.4 | 150 |
| 80 | 3 | 109.2 | 89.9 | 8.3 | 76.4 | 58.7 | 8.3 | 8 | 8 | 3.5 | 15.7 | 109 | 176 |
Class 3000 SS316 Socket Weld Union Weight Chart in KG
| DN | NPS | 3000 |
| 6 | 1/8 | 0.25 |
| 8 | 1/4 | 0.30 |
| 10 | 3/8 | 0.35 |
| 15 | 1/2 | 0.46 |
| 20 | 3/4 | 0.61 |
| 25 | 1 | 0.85 |
| 32 | 1-1/4 | 1.35 |
| 40 | 1-1/2 | 1.92 |
| 50 | 2 | 2.85 |
| 65 | 2-1/2 | 4.90 |
| 80 | 3 | 7.10 |