We received an order about lap joint stub end.The customer order is as follows: 3″ Sch 40 Grade 316 stub end type B dimensions to ASTM A403.The specification is stub end type B.
Types of MSS SP-43 lap joint stub end:
In the MSS SP-43 standard,the stub end divided into type A and type B.
Type A-Type “A” stub ends are for use with standard lap joint flanges.The lap thickness on the stub end is greater than or equal to,the nominal thickness of the pipe wall.Also,type “A” has its outside corner radius to receive lap joint flanges.The inside corner is square.The lap generally has a machined serrated face.
Type B- Type “B” stub ends are for use with standard slip-on flanges acting as lap joint flanges.The lap thickness on these stub ends is greater than or equal to,the nominal thickness of the pipe wall.Also,Type “B” has an outside corner radius small enough to receive slip-on flanges that are being used as the backup flange.The inside corner is square. The lap generally has a machined serrated face.
As shown in the drawing standard below:
MSS SP-43 lap joint stub end Type A and Type B drawing
Lap joint stub ends type A or B dimensions:
| Norminal Pipe Size | (OD) | (G) | Length(J) | Radius(A) |
SCH 40S |
||||||||
| short | long | A | B | (ID) | Wall thickness(T) | Lap thickness(t) | Approx.Height | ||||||
| 0.5 | 0.84 | 1.375 | 2 | 3 | 0.125 | 0.031 | 0.622 | 0.109 | 0.109 | 0.19 | |||
| 0.75 | 1.05 | 1.688 | 2 | 3 | 0.125 | 0.031 | 0.842 | 0.113 | 0.113 | 0.26 | |||
| 1 | 1.315 | 2 | 2 | 4 | 0.125 | 0.031 | 1.049 | 0.133 | 0.133 | 0.38 | |||
| 1.25 | 1.66 | 2.5 | 2 | 4 | 0.188 | 0.031 | 1.38 | 0.14 | 0.14 | 0.55 | |||
| 1.5 | 1.9 | 2.875 | 2 | 4 | 0.25 | 0.031 | 1.61 | 0.145 | 0.145 | 0.96 | |||
| 2 | 2.375 | 3.625 | 2.5 | 6 | 0.313 | 0.031 | 2.067 | 0.154 | 0.154 | 1.35 | |||
| 2.5 | 2.875 | 4.125 | 2.5 | 6 | 0.313 | 0.031 | 2.469 | 0.203 | 0.203 | 1.77 | |||
It is obvious that the main difference of the type A and type B is the corner radius,the corner radius of type B is extremely small.
ASTM A403 Grade 316 MSS SP-43 lap joint stub end Type B finished in Haihao Group
The MSS SP-43 stub ends have passed our customer’s quality inspection,and our customer said the products used well.If you want to know more about steel pipes,pipe fittings and flanges products,please contact us email:sales@haihaogroup.com
