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What is a class 3000 Union
Socket Weld Union
Threaded Union
Different from couplings, unions are more easily installed and dismantled by having three single parts combined together: nut, cloud head and flat connection. With the different type of end connection, there are two mail kinds of unions which are socket weld union and threaded union. Even though it is a kind of forged steel fittings , the standard for it is MSS SP-83, not ASME B16.11. Also dislike the pressure ratings in ASME B16.11, unions only have one pressure rating class 3000. That is why all unions are class 3000 union. Some times you may see class 6000 union, technically there are the same generalduty.
Specification of MSS SP-83 Class 3000 Union
Despite the difference in connection end, class 3000 union no matter it is socket weld or threaded union , it can basically be applied in the same material grade and within the same size range.
They are widely used in oil and gas /pipeline/power Industries/chemical industries because they are very convenient to install and remove.
Size Range | 1/8" – 3" / DN6 - DN80 |
Pressure Rating | Class 3000 |
Standard | MSS SP-83 |
Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317, 347, 904L，1.4404, 1.4437. |
Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
Application | Oil and Gas /Pipeline/Power Industries/Chemical Industries |
Dimensions of MSS SP-83 Union
As we mentioned above ,there are two different types of class 3000 union, below are the detailed dimension information about them.
MSS SP-83 Threaded Union
NPS | A(Pipe End) | C(Wall) | D1(Water Way Bore) | D2(Water Way Bore) | F(Male Flange) | G(Nut) | H(Threads) | J(Bearing) | L(Length) | N |
1/8″ | 14.7 | 2.41 | 8.43 | 6.43 | 3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
1/4″ | 19 | 3.02 | 11.13 | 9.45 | 3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
3/8″ | 22.9 | 3.2 | 14.27 | 13.51 | 3.43 | 3.43 | 14 | 1.37 | 46 | 55.9 |
1/2″ | 27.7 | 3.73 | 17.86 | 17.07 | 3.68 | 3.68 | 14 | 1.5 | 49 | 58.4 |
3/4″ | 33.5 | 3.91 | 23.01 | 21.39 | 4.06 | 4.06 | 11 | 1.68 | 56.9 | 66 |
1″ | 41.4 | 4.55 | 28.98 | 27.74 | 4.57 | 4.45 | 11 | 1.85 | 62 | 78.7 |
1-1/4″ | 50.5 | 4.85 | 37.69 | 35.36 | 5.33 | 5.21 | 11 | 2.13 | 71.1 | 94 |
1-1/2″ | 57.2 | 5.08 | 43.54 | 41.2 | 5.84 | 5.59 | 10 | 2.31 | 76.5 | 111.8 |
2″ | 70.1 | 5.54 | 55.58 | 52.12 | 6.6 | 6.35 | 10 | 2.69 | 86.1 | 132.1 |
2-1/2″ | 85.3 | 7.01 | 66.27 | 64.31 | 7.49 | 7.11 | 8 | 3.07 | 102.4 | 149.9 |
3″ | 102.4 | 7.62 | 88.25 | 77.27 | 8.26 | 8 | 8 | 3.53 | 109 | 175.3 |
MSS SP-83 Socket Weld Union
Nom. Pipe size | Pipe | Socket | Socket | Water | Laying | Male | Nut | Thrds. | Beaning | Depth | Length | Clear | |
Min. | Min. | Min. | Min. | Min. | Min. | Min. | |||||||
(mm) | (inch) | A | B | C | D | E | F | G | H | J | K | L | N |
6 | 1/8 | 21.8 | 11.18 | 3.18 | 7.59 | 22.4 | 3.18 | 3.18 | 16 | 1.24 | 9.7 | 41.4 | 50.8 |
10.67 | 6.07 | 19.1 | |||||||||||
8 | 1/4 | 21.8 | 14.61 | 3.3 | 10.01 | 22.4 | 3.18 | 3.18 | 16 | 1.24 | 9.7 | 41.4 | 50.8 |
14.1 | 8.48 | 19.1 | |||||||||||
10 | 3/8 | 25.9 | 18.03 | 3.51 | 13.28 | 26.9 | 3.43 | 3.43 | 14 | 1.37 | 9.7 | 46 | 55.9 |
17.53 | 11.76 | 20.6 | |||||||||||
15 | 1/2 | 31.2 | 22.23 | 4.09 | 16.56 | 26.9 | 3.68 | 3.68 | 14 | 1.5 | 9.7 | 49 | 58.4 |
21.73 | 15.04 | 20.6 | |||||||||||
20 | 3/4 | 37.1 | 27.56 | 4.27 | 21.69 | 31.8 | 4.06 | 4.06 | 11 | 1.68 | 12.7 | 56.9 | 66 |
27.05 | 20.17 | 25.4 | |||||||||||
25 | 1 | 45.5 | 34.29 | 4.98 | 27.41 | 34.3 | 4.57 | 4.45 | 11 | 1.85 | 12.7 | 62 | 78.7 |
33.78 | 25.88 | 26.2 | |||||||||||
32 | 1.1/4 | 54.9 | 43.05 | 5.28 | 35.81 | 40.6 | 5.33 | 5.21 | 11 | 2.13 | 12.7 | 71.1 | 94 |
42.55 | 34.29 | 32.5 | |||||||||||
40 | 1.1/2 | 61.5 | 49.15 | 5.54 | 41.66 | 42.2 | 5.84 | 5.59 | 10 | 2.31 | 12.7 | 76.5 | 111.8 |
48.64 | 40.13 | 34 | |||||||||||
50 | 2 | 75.2 | 61.62 | 6.05 | 53.26 | 45.5 | 6.6 | 6.35 | 10 | 2.69 | 15.7 | 86.1 | 132.1 |
61.11 | 51.74 | 37.3 | |||||||||||
65 | 2.1/2 | 91.7 | 74.45 | 7.67 | 64.24 | 61.7 | 7.49 | 7.11 | 8 | 3.07 | 15.7 | 102.4 | 149.9 |
73.81 | 61.19 | 52.1 | |||||||||||
80 | 3 | 109.2 | 90.42 | 8.31 | 79.45 | 63.8 | 8.26 | 8 | 8 | 3.53 | 15.7 | 109 | 176 |
89.79 | 76.4 | 53.6 | |||||||||||
Package and Marking of Class 3000 Union
Our products like forged class 3000 union is packaged to make sure that there's no damage throughout transit. Just in case of exports, customary export packaging is completed in wooden boxes or cases. All forged steel union are marked with necessary information like material grade, size and heat No. On requests we can do custom marking on our products.
What is a class 3000 Union
Socket Weld Union
Threaded Union
Different from couplings, unions are more easily installed and dismantled by having three single parts combined together: nut, cloud head and flat connection. With the different type of end connection, there are two mail kinds of unions which are socket weld union and threaded union. Even though it is a kind of forged steel fittings , the standard for it is MSS SP-83, not ASME B16.11. Also dislike the pressure ratings in ASME B16.11, unions only have one pressure rating class 3000. That is why all unions are class 3000 union. Some times you may see class 6000 union, technically there are the same generalduty.
Specification of MSS SP-83 Class 3000 Union
Despite the difference in connection end, class 3000 union no matter it is socket weld or threaded union , it can basically be applied in the same material grade and within the same size range.
They are widely used in oil and gas /pipeline/power Industries/chemical industries because they are very convenient to install and remove.
Size Range | 1/8" – 3" / DN6 - DN80 |
Pressure Rating | Class 3000 |
Standard | MSS SP-83 |
Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317, 347, 904L，1.4404, 1.4437. |
Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
Application | Oil and Gas /Pipeline/Power Industries/Chemical Industries |
Dimensions of MSS SP-83 Union
As we mentioned above ,there are two different types of class 3000 union, below are the detailed dimension information about them.
MSS SP-83 Threaded Union
NPS | A(Pipe End) | C(Wall) | D1(Water Way Bore) | D2(Water Way Bore) | F(Male Flange) | G(Nut) | H(Threads) | J(Bearing) | L(Length) | N |
1/8″ | 14.7 | 2.41 | 8.43 | 6.43 | 3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
1/4″ | 19 | 3.02 | 11.13 | 9.45 | 3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
3/8″ | 22.9 | 3.2 | 14.27 | 13.51 | 3.43 | 3.43 | 14 | 1.37 | 46 | 55.9 |
1/2″ | 27.7 | 3.73 | 17.86 | 17.07 | 3.68 | 3.68 | 14 | 1.5 | 49 | 58.4 |
3/4″ | 33.5 | 3.91 | 23.01 | 21.39 | 4.06 | 4.06 | 11 | 1.68 | 56.9 | 66 |
1″ | 41.4 | 4.55 | 28.98 | 27.74 | 4.57 | 4.45 | 11 | 1.85 | 62 | 78.7 |
1-1/4″ | 50.5 | 4.85 | 37.69 | 35.36 | 5.33 | 5.21 | 11 | 2.13 | 71.1 | 94 |
1-1/2″ | 57.2 | 5.08 | 43.54 | 41.2 | 5.84 | 5.59 | 10 | 2.31 | 76.5 | 111.8 |
2″ | 70.1 | 5.54 | 55.58 | 52.12 | 6.6 | 6.35 | 10 | 2.69 | 86.1 | 132.1 |
2-1/2″ | 85.3 | 7.01 | 66.27 | 64.31 | 7.49 | 7.11 | 8 | 3.07 | 102.4 | 149.9 |
3″ | 102.4 | 7.62 | 88.25 | 77.27 | 8.26 | 8 | 8 | 3.53 | 109 | 175.3 |
MSS SP-83 Socket Weld Union
Nom. Pipe size | Pipe | Socket | Socket | Water | Laying | Male | Nut | Thrds. | Beaning | Depth | Length | Clear | |
Min. | Min. | Min. | Min. | Min. | Min. | Min. | |||||||
(mm) | (inch) | A | B | C | D | E | F | G | H | J | K | L | N |
6 | 1/8 | 21.8 | 11.18 | 3.18 | 7.59 | 22.4 | 3.18 | 3.18 | 16 | 1.24 | 9.7 | 41.4 | 50.8 |
10.67 | 6.07 | 19.1 | |||||||||||
8 | 1/4 | 21.8 | 14.61 | 3.3 | 10.01 | 22.4 | 3.18 | 3.18 | 16 | 1.24 | 9.7 | 41.4 | 50.8 |
14.1 | 8.48 | 19.1 | |||||||||||
10 | 3/8 | 25.9 | 18.03 | 3.51 | 13.28 | 26.9 | 3.43 | 3.43 | 14 | 1.37 | 9.7 | 46 | 55.9 |
17.53 | 11.76 | 20.6 | |||||||||||
15 | 1/2 | 31.2 | 22.23 | 4.09 | 16.56 | 26.9 | 3.68 | 3.68 | 14 | 1.5 | 9.7 | 49 | 58.4 |
21.73 | 15.04 | 20.6 | |||||||||||
20 | 3/4 | 37.1 | 27.56 | 4.27 | 21.69 | 31.8 | 4.06 | 4.06 | 11 | 1.68 | 12.7 | 56.9 | 66 |
27.05 | 20.17 | 25.4 | |||||||||||
25 | 1 | 45.5 | 34.29 | 4.98 | 27.41 | 34.3 | 4.57 | 4.45 | 11 | 1.85 | 12.7 | 62 | 78.7 |
33.78 | 25.88 | 26.2 | |||||||||||
32 | 1.1/4 | 54.9 | 43.05 | 5.28 | 35.81 | 40.6 | 5.33 | 5.21 | 11 | 2.13 | 12.7 | 71.1 | 94 |
42.55 | 34.29 | 32.5 | |||||||||||
40 | 1.1/2 | 61.5 | 49.15 | 5.54 | 41.66 | 42.2 | 5.84 | 5.59 | 10 | 2.31 | 12.7 | 76.5 | 111.8 |
48.64 | 40.13 | 34 | |||||||||||
50 | 2 | 75.2 | 61.62 | 6.05 | 53.26 | 45.5 | 6.6 | 6.35 | 10 | 2.69 | 15.7 | 86.1 | 132.1 |
61.11 | 51.74 | 37.3 | |||||||||||
65 | 2.1/2 | 91.7 | 74.45 | 7.67 | 64.24 | 61.7 | 7.49 | 7.11 | 8 | 3.07 | 15.7 | 102.4 | 149.9 |
73.81 | 61.19 | 52.1 | |||||||||||
80 | 3 | 109.2 | 90.42 | 8.31 | 79.45 | 63.8 | 8.26 | 8 | 8 | 3.53 | 15.7 | 109 | 176 |
89.79 | 76.4 | 53.6 | |||||||||||
Package and Marking of Class 3000 Union
Our products like forged class 3000 union is packaged to make sure that there's no damage throughout transit. Just in case of exports, customary export packaging is completed in wooden boxes or cases. All forged steel union are marked with necessary information like material grade, size and heat No. On requests we can do custom marking on our products.
