Lap join stub end

The Lap joint stub end is the fittings that are used in place of welded flanges when the support of rotating back up flanges is required.

LAP接头也命名为存根末端和Vanstone Flared Laps，它用于代替所需旋转凸缘的焊接法兰。

• Minimum lap thickness shall not be less than nominal wall thickness.
• Contact faces of stub ends shall have a concentric serration or spiral according to the purchaser's requirements.
• These lengths and radius apply for schedule 40s or thinner stainless steel pipes.
• Radius of fillet B is only effective to MSS SP-43 lap joint stub ends.

Lap Joints are consisted of three series.

Nominal Pipe Size	外径 at Bevel	Length	Radius of Fillet		膝盖的直径
			A	B
NPS	D	L	R		G
1/2 3/4 1	21.3 26.7 33.4	51 51 51	3.0 3.0 3.0	0.8 0.8 0.8	35 43 51
11/4 11/2 2	42.2 48.3 60.3	51 51 64	5.0 6.0 8.0	0.8 0.8 0.8	64 73 9.2
21/2 3 31/2	73.0 88.9 101.6	64 64 76	8.0 10.0 10.0	0.8 0.8 0.8	106. 127 140
4 5 6	114.3 141.3 168.3	76 76 89	11.0 11.0 13.0	0.8 1.6 1.6	157 185 218.
8 10 12	219.1. 273.0 323.8	102. 127 152	13.0 13.0 13.0	1.6 1.6 1.6	270 324. 381
14 16 18	355.6 406.4 457.0	152 152 152	13.0 13.0 13.0	1.6 1.6 1.6	413 470 533
20 22 24	508.0 559.0 610.0	152 152 152	13.0 13.0 13.0	1.6 - 1.6	584. 641 692

• Type A & B Stub Ends are made similar to forging pipe fittings such as elbows and tees.
• C型存根末端通过定制尺寸进行。

LAP关节中的好处

The use of lap joint stub ends has these two advantages:

Reduces the overall cost of the flanged joint

通常，圈子接头凸缘比短元端和管道的材料较低，从而节省了用于凸缘接头的高级材料的总重量。

例子：

For an SS316 pipe, instead of using a full 316 welding neck flange, a combination of an SS316 stub end and a carbon steel lap joint flange would do the same exact job, but the total weight of SS316 material would be lower, and the cost as well.

基本上，存根末端允许最小化不锈钢，双工和镍合金管道中的高档材料的重量，节省成本。当然，直径和法兰的班级越大，储蓄越高！

Facilitates the installation of the flange

The lap joint flange can be rotated on the pipe and simplify the alignment of the bolt holes of the mating flanges

It shall be noted that stud ends are becoming popular also in high-pressure applications (whereas they were used for low-pressure applications only in the past).

有三种不同类型的短末端，型A，B和C。型存根末端被加工，以适合标准的搭接连接法兰

We offer stub ends at highly competitive prices.

LAP关节末端– The ‘mated’ pair to a Lap Joint Flange. Stub Ends are Fittings used in place of welded flanges where rotating back up flanges are desired. Stub Ends are typically manufactured by two methods, Type A & Type B and are available in two standard lengths , long (ANSI) or short (MSS) pattern.

Features:

• Thermal stability
• 机械强度高
• Long functional life

Manufacturing standards of stub end:

• ASTM ASME A / SA 403
• MSS SP43和SP75 ANSI B16。9.
• ANSI B16. 28 ASTM A815 ASTM B363 B366
• DIN2605 DIN2615 DIN2616 DIN2617
• GB12459GB13401
• JIS2313

Specifications:

• 等级：ASME / ASTM SA / A234
• 材料：
• Stainless Steel,316/316L Stainless Steel, 304/304L Stainless Steel and Chrome-moly
• Carbon steel

技术规格：

• Thicknesses are based on ASME B16.48 specifications or the products can be manufactured to customer specifications.
• Standard surface finish is 125-250 RMS serrated finish.
• 其他饰面可应要求提供。
• c/w a standard shop primer on carbon steel products for rust inhibitor purposes.
• Size: Available in all sizes and thickness

Usage:

Petroleum, Chemical, Power, Gas, Metallurgy, Ship-building, Construction, ect.

Using stub ends allows sections of the line to be opened for cleaning, inspection, or quick replacement etc, without the need to re-weld.

Specifications:

• 等级：ASME / ASTM SA / A234
• 材质：不锈钢
• Size: Available in all sizes and thickness