Short Description

Model No.: ASTM-B381-Titanium-Long-Stub-End

China Titanium Stub End Manufacturer www.steeljrv.com supplies ASTM B381 Titanium Long Stub End.

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Key Specifications / Features

Type: Titanium Long Stub End
Material: Grade 1 (UNS R50250), Grade 2 (UNS R50400), Grade 5 (UNS R56400), Grade 7 (UNS R52400),Grade 9 (UNS R56320), Grade 12 (UNS R53400),etc
Size: 1/2″-48″ (DN15-1200)
WT: SCH5S-SCHXXS
Standard: ASME B16.9/MSS SP-43 type A/B
Type: Short pattern, Long pattern

Chemical Composition % of Titanium Long Stub End

STANDARD CHEMICAL COMPOSITION (weight %, ma√ or range)
Grade UNS N C H Fe O Al V Pd Mo Ni
No
GR 1 R50250 0.03 0.08 0.015 0.2 0.18
GR 2 R50400 0.03 0.08 0.015 0.3 0.25
GR 3 R50550 0.05 0.08 0.015 0.3 0.35
GR 4 R50700 0.05 0.08 0.015 0.5 0.4
GR 5 R56400 0.05 0.08 0.015 0.4 0.2 5.5-6.75 3.5-4.5
GR 7 R52400 0.03 0.08 0.015 0.3 0.25 0.12-0.25
GR 9 R56320 0.03 0.08 0.015 0.25 0.15 2.5-3.5  2.0-3.0 
GR 12 R53400 0.03 0.08 0.015 0.3 0.25 0.2-0.4 0.6-0.9
GR 23 R56401 0.03 0.08 0.0125 0.25 0.13 5.5-6.5 3.5-4.5

Mechanical Properties of Titanium Long Stub End

STANDARD CHEMICAL COMPOSITION (weight %, ma√ or range) MECHANICAL PROPERTIES (min)
Grade UNS Tensile Yield El. Red.
No Mpa Mpa % %
GR 1 R50250 240 138 24 30
GR 2 R50400 345 275 20 30
GR 3 R50550 450 380 18 30
GR 4 R50700 550 483 15 25
GR 5 R56400 895 828 10 25
GR 7 R52400 345 275 20 30
GR 9 R56320 620 483 15 25
GR 12 R53400 483 345 18 25
GR 23 R56401 828 759 10 15

China Titanium Stub End Manufacturer www.steeljrv.com supplies ASTM B381 Titanium Long Stub End.

Dimensions butt welded Stub Ends schedule 10S MSS SP-43 type A/B

stubend dim 4 - ASTM B381 Titanium Long Stub End
NPS OD T G F R
Type A
R
Type B
1/2 21.3 2.11 34.9 50.8 3.05 0.76
3/4 26.7 2.11 42.9 50.8 3.05 0.76
1 33.4 2.77 50.8 50.8 3.05 0.76
42.2 2.77 63.5 50.8 4.83 0.76
48.3 2.77 73 50.8 6.35 0.76
2 60.3 2.77 92.1 63.5 7.87 0.76
73 3.05 104.8 63.5 7.87 0.76
3 88.9 3.05 127 63.5 9.65 0.76
101.6 3.05 139.7 76.2 9.65 0.76
stubend dim 4 - ASTM B381 Titanium Long Stub End
NPS OD T G F R
Type A
R
Type B
4 114.3 3.05 157.2 76.2 11.18 0.76
5 141.3 3.40 185.7 76.2 11.18 1.52
6 168.3 3.40 215.9 88.9 12.7 1.52
8 219.1 3.76 269.9 101.6 12.7 1.52
10 273.1 4.19 323.9 127 12.7 1.52
12 323.9 4.57 381 152.4 12.7 1.52
14 355.6 4.78 412.8 152.4 12.70 1.52
16 406.4 4.78 469.9 152.4 12.7 1.52
18 457.2 4.78 533.4 152.4 12.70 1.52
20 508 5.54 584.2 152.4 12.70 1.52
24 609.6 6.35 692.2 152.4 12.7 1.52

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

DIMENSIONAL TOLERANCES OF STUB ENDS MSS SP-43

Nominal Pipe Size 1/2 up to 2½ 3 to 3½ 4 5 to 8 10 to 18 20 to 24
Outside Diameter at Welding End (OD) 0.8 0.8 0.8 + 1.6
– 0.8
+ 2.29
– 0.76
+ 3.05
– 0.76
Overall Length (F) 1.6 1.6 1.6 1.6 2 2
Outside Diameter of Lap (G) + 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
Thickness of Lap (T) + 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
Fillet Radius of Lap (R) + 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated.

Notes:

  • Type A for Lap Joint Flanges
  • Type B for Slip On Flanges
  • MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Dimensions Lap Joint Stub Ends schedule STD & XS ASME B16.9

stubend dim 4 - ASTM B381 Titanium Long Stub End

Schedule STD

NPS OD T G F R kg
1/2 21.3 2.77 34.9 76.2 3.18 0.16
3/4 26.7 2.87 42.9 76.2 3.18 0.23
1 33.4 3.38 50.8 101.6 3.18 0.29
42.2 3.56 63.5 101.6 4.76 0.45
48.3 3.68 73 101.6 6.35 0.54
2 60.3 3.91 92.1 152.4 7.94 1
73 5.16 104.8 152.4 7.94 1.5
3 88.9 5.49 127 152.4 9.53 2.1
101.6 5.74 139.7 152.4 9.53 2.5
stubend dim 4 - ASTM B381 Titanium Long Stub End
NPS OD T G F R kg
4 114.3 6.02 157.2 152.4 11.11 3
5 141.3 6.55 185.7 203.2 11.11 5.4
6 168.3 7.11 215.9 203.2 12.70 7.3
8 219.1 8.18 269.9 203.2 12.70 11.6
10 273.1 9.27 323.9 254 12.70 18
12 323.9 9.53 381 254 12.70 21
14 355.6 9.53 412.8 304.8 12.70 28
16 406.4 9.53 469.9 304.8 12.70 34
18 457.2 9.53 533.4 304.8 12.70 39
20 508 9.53 584.2 304.8 12.70 44
24 609.6 9.53 692.2 304.8 12.70 57

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

Schedule XS

NPS OD T G F R kg
1/2 21.3 3.73 34.9 76.2 3.18 0.2
3/4 26.7 3.91 42.9 76.2 3.18 0.3
1 33.4 4.55 50.8 101.6 3.18 0.4
42.2 4.85 63.5 101.6 4.76 0.6
48.3 5.08 73 101.6 6.35 0.7
2 60.3 5.54 92.1 152.4 7.94 1.4
73 7.01 104.8 152.4 7.94 2
3 88.9 7.62 127 152.4 9.53 2.9
101.6 8.08 139.7 152.4 9.53 3.4
stubend dim 4 - ASTM B381 Titanium Long Stub End
NPS OD T G F R kg
4 114.3 8.56 157.2 152.4 11.11 4.1
5 141.3 9.53 185.7 203.2 11.11 7.5
6 168.3 10.97 215.9 203.2 12.70 10
8 219.1 12.70 269.9 203.2 12.70 16
10 273.1 12.70 323.9 254 12.70 24
12 323.9 12.70 381 254 12.70 29
14 355.6 12.70 412.8 304.8 12.70 38
16 406.4 12.70 469.9 304.8 12.70 43
18 457.2 12.70 533.4 304.8 12.70 49
20 508 12.70 584.2 304.8 12.70 63
24 609.6 12.70 692.2 304.8 12.70 76

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

DIMENSIONAL TOLERANCES OF STUB ENDS ASME B16.9

Nominal Pipe Size 1/2 up to 2½ 3 to 3½ 4 5 to 8 10 to 18 20 to 24
Outside Diameter at Welding End (OD) + 1.6
– 0.8
1.6 1.6 + 2.29
– 1.6
+ 4.06
– 3.05
+ 6.35
– 4.83
Overall Length (F) 1.6 1.6 1.6 1.6 2 2
Outside Diameter of Lap (G) + 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
Thickness of Lap (T) + 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
+ 1.52
– 0
Fillet Radius of Lap (R) + 0
– 0.76
+ 0
– 0.76
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
+ 0
– 1.6
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated.

20171231083805 44338 - ASTM B381 Titanium Long Stub End

Lap Joint Stub End – 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.

Ends/Face lap finishing

The following types of ends may be ordered:

  • Beveled Ends (generally ASME B16.25)
  • Squared Ends
  • Flanged Ends
  • Victaulic Grooves
  • Threaded Ends (Male Only)

ASME B16.25 END WELDING BEVEL

20171231084450 66530 - ASTM B381 Titanium Long Stub End

Stub Ends assembly

Stub ends and lap joint flanges can be assembled following this process:

  • The Lap Flange is slipped over and onto the Stub end Flange.
  • The Stub End Flange is then welded onto a pipe spool, using an approved Welding. Procedure Specification (WPS), by a qualified Welder. The Lap Joint Flange, backing Flange, can revolve around the Stub End, which is now attached to the piping spool.
  • The bolt holes of the Lap Joint Flange can now be orientated and aligned with the bolt holes of a mating Flange of the same ASME designate rating and NPS.

The Lap Joint Flange can be mated to any Flange covered in ASME B16.5, Weld Neck, Slip On, Threaded, Socket Weld, another Lap Joint Flange. It can also be mated to a fabricated plate Flange with compatible, bolting dimensions.

20171231084717 57672 - ASTM B381 Titanium Long Stub End

Why use Stub Ends

COMMERCIAL BENEFITS

Commercial advantages are that the Stub End, will be wetted and it must be made of a grade of material that meets the process design and service conditions of the pipeline. However, the Lap Flange is un-wetted and it can be made of a lower grade of material as long as it meets the mechanical strength requirements of the piping systems.

This means that instead of:
  • Duplex Stub End and a Duplex Lap Joint, you could have Duplex Stub End and Carbon Steel Lap Joint Flange.
  • Or you could have Stainless Steel Stub End and Carbon Steel Lap Joint Flange. There are other bimetallic combinations that result in a flange assembly that is commercially cheaper.

During recent years the price differential between Duplex/Stainless Steel and Carbon Steel has narrowed and this practice on large Projects has become less common, however a cost difference always exists (the higher the NPS and the length of the pipeline / piping system, the higher the saving). On the other hand, the warehousing cost of one single component, i.e. a Weld Neck Flange, requires less shelf space than the cost of warehousing a Lap Joint and a Stub End. End Users and Contractors shall determine the actual convenience of using stub ends, considering all these factors and generally the commercial advantage is still valid and it may suit certain situation, especially in “brownfield” modifications.

INSTALLATION BENEFITS

The loose Flange concept of a Lap Joint, is very beneficial during field installation of piping systems. If two spools are to be mated up in the field, having one Flange that can be rotated is very advantageous when aligning the bolt holes, prior to the introduction of the Stub bolt and the accompanying nuts. The facility of easier orientation and alignment of bolt holes, is of particular use it there is a spool that has to be removed frequently, if positive isolation is a process requirement.

Stub Ends limitations

A Lap Joint consists of two independent components that are not integrated with a weld and like for like in size/pressure class/material it lacks the mechanical strength and capabilities to withstand fatigue, like a one piece Weld Neck Flange or a welded together Slip On or Socket Weld Flanges. In cyclic services, collars EN 1092-1 type 35 PN 16-25-40 are used instead of stub ends (especially to close pumps and compressors). If carefully consideration is given to Process Design condition, the service and the final application, then a Lap Joint Flange mechanical connection are a valid and cheaper method for installing piping systems compared to the use of standard flanges.

How to order a Stub End

The following information shall be provided to order a stub end:

  • NPS
  • Schedule
  • Length (according to norms MSS SP43 / ASME B16.9 / custom)
  • Specs and material grade
  • Ends finish
  • Execution: seamless / welded (wx)

Inspection of Stub End

  • Visual the surface of stub end body. Such as dents, die marks, porosity, undercuts.
  • Check the marking. Such as name, size, schedule, grade, standard and Heat No.
  • Measure the dimensions. Such as outside diameter, thickness, height or length.
  • Test the chemical composition of stub ends.

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