Vessel heads

ANSI B16.9 covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made butt-welding fittings in sizes NPS 1/2 through 48 (DN 15 through 1200).

We manufacture a wide range of vessel heads to works standards, both for construction purposes and as dished vessel heads in the form of torispherical heads, elliptical heads and caps for pressure applications.

DISDHED PLATES
HEADS
TORISPHERICAL HEADS
VESSEL HEADS d

And if a central hole is needed for connections, this can also be provided.

lifting and handling of a Pressure vessel

Vessels used to store liquids at low pressure are normally fitted with flat end sections. This is the cheapest way of enclosing the end of a vessel. For storage of fluids at higher pressures, the ends are normally domed to reduce mechanical stresses.

A number of different domed head designs are used.

DISDHED PLATES
Item Description
Standards works standards
Measurements Ø 21.3-610.0mm, thickness 3.0-10.0mm
Materials S 235
Certifications 2.2
For pressures over 10 bar, ellipsoidal heads are often used. In cross-section, the head resembles an ellipse, its radius varying continuously. This results in a smooth transition between the dome and the cylindrical part of the vessel. Ellipsodial heads are deeper than comparable torispherical heads.
HEADS
Item Description
Standards DIN 10253-1
Measurements Ø 21.3-406.4mm, thickness 3.0-8.0mm
Materials S 235
Certifications 2.2
TORISPHERICAL HEADS
Item Description
Standards DIN 28011
Measurements Ø 21.3-610.0mm, thickness 3.0-10.0mm
Materials S 235, P265GH, 16Mo3
Certifications 2.2 / 3.1 / 3.2
CAPS
Item Description
Standards EN 10253-2 (Typ A/B)
Measurements Ø 21.3-610.0mm, thickness 2.0-30.0mm
Materials S 235, P265G, 16Mo, 313CrMo4-5, 10CrMo9-10;
P355 N/NH/NL1/NL2 WPB; WP11; WP22
Certifications 3.1 / 3.2

Deep Drawing method of end caps

One of the most common manufacturing methods for caps, where plate is cut out in a circle and formed by deep drawing.

Deep drawing is the manufacturing process of forming sheet metal stock, called blanks, into geometrical or irregular shapes that are more than half their diameters in depth. Deep drawing involves stretching the metal blank around a plug and then moving it into a moulding cutter called a die.

A drawing press can be used for forming sheet metal into different shapes and the finished shape depends on the final position that the blanks are pushed down in. The metal used in deep drawing must be malleable as well as resistant to stress and tension damage.

How to get high quality pipe cap?

Pipe cap acts as protective device and are designed to protect pipe ends of various shapes. The main purpose of using pipe caps is to waterproof the connections. They are also used to close the the ends of hydraulic or pneumatic pipes and tubes. They are used in the plumbing apparatus of domestic, commercial and industrial water supply lines, machinery and processing equipment etc. They are also fitted on water pump lines with the sole purpose of removing air blocks. Pipe caps are highly demanded as an important category of pipe fittings. If a solvent-weld cap is used to provide for a future connection point, several inches of pipe must be left before the cap; when the cap is cut off for the future connection, enough pipe must remain to allow a new fitting to be glued onto it.

How to connect pipeline with pipe cap?

Pipe Cap is directly welded to die at the end of the pipeline; at the end of the pipeline can also welding flange, then with a blind flange to death, when necessary can open the blind flange, pipeline check inside. The conventional cap holder with pressure pressing made by thick wall; forging; by spinning large diameter. The need for maintenance or even after the connecting line, with blind, not later, with a pipe cap. With the blind plate has the possibility of leakage, there is a long time, and screw rust died, as useless, the heat pipe is not very easy to heat insulation.

SURFACE TREATMENT:

  • Transparent oil, rust-proof black oil or hot galvanized.
  • Special design available All the production process are made according to ISO9001:2000 strictly.
  • Based on different materials, pipe caps include carbon steel cap, stainless steel cap, and alloy steel cap etc.
  • Depending on their construction, pipe caps contain threaded cap, tapered cap and anti-roll cap etc.

Applications of end caps:

End caps are widely used in various commercial and industrial applications. Industrial applications include:

  • Chemical processing
  • Petroleum
  • Pulp/paper
  • Refining
  • Textile
  • Waste treatment, Marine
  • Utilities/power generation
  • Industrial equipment
  • Automotive
  • Gas compression
  • Distribution industries
  • Industrial plant fluid power systems.

End caps FAQs

Pipe Cap are used for connecting pipes of different diameters and find wide applications in various chemicals, construction industries, paper, cement & ship builders.

Bevelled Ends

The ends of all buttweld fittings are bevelled, exceeding wall thickness 4 mm for austenitic stainless steel, or 5 mm for ferritic stainless steel. The shape of the bevel depending upon the actual wall thickness. This bevelled ends are needed to be able to make a "Butt weld".

Welding Bevel acc.to ASME / ANSI B16.9 and ASME / ANSI B16.28

ASME B16.25 covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and dimensional tolerances).

Our in-hourse R&D team developed bevel ends equipment are good using in thickness 2mm to 20mm pipe fittings, guarantee high efficiency and high quality.

Send us your technical drawings

These weld edge preparation requirements are also incorporated into the ASME standards (e.g., B16.9, B16.5, B16.34).

ASME B16.25 (BUTT WELD ENDS)

ASME B16.25 sets standards for the preparation of the ends of components that need to be welded together.

Cut square or slight chamfer, at manufacturer’s option for :

  • t ≤ 0.19” carbon steel or ferritic alloy steels
  • t ≤ 0.12” austenitic alloy steels

Buttweld Fittings general

A pipe fitting is defined as a part used in a piping system, for changing direction, branching or for change of pipe diameter, and which is mechanically joined to the system.

There are many different types of fittings and they are the same in all sizes and schedules as the pipe.

End cap size data

Pipe Cap are used for connecting pipes of different diameters and find wide applications in various chemicals, construction industries, paper, cement & ship builders

Out diameter High size Wall thickness accord to 'E'
DN NPS E E1 E
15 1/2 25 25 3.73
20 3/4 25 25 3.91
25 1 38 38 4.55
32 11／4 38 38 4.85
40 11／2 38 38 5.08
50 2 38 44 5.54
65 21／2 38 51 7.01
80 3 51 64 7.62
90 31／2 64 76 8.08
100 4 64 76 8.56
125 5 76 89 9.53
150 6 89 102 10.97
200 8 102 127 12.7
250 10 127 152 12.7
300 12 152 178 12.7
350 14 165 191 12.7
400 16 178 203 12.7
450 18 203 229 12.7
500 20 229 254 12.7
550 22 254 254 12.7
600 24 267 305 12.7
650 26 267 　 　
700 28 267 　 　
750 30 267 　 　
800 32 267 　 　
850 34 267 　 　
900 36 267 　 　
950 38 305 　 　
1000 40 305 　 　
1050 42 305 　 　
1100 44 343 　 　
1150 46 343 　 　
1200 48 343 　 　
  • Size range: 1/2 to 56 inches (DN15 to DN1400)
  • Pressure: SCH5 to SCH160v
  • Wall Thickness:sch10, sch20, sch30, std, sch40, sch60, xs, sch80, sch100, sch120, sch140, sch160, xxs, sch5s, sch20s, sch40s, sch80s
  • Max. wall thickness: 200mm
Size range of A234 WPB Large Diameter Pipe Cap
OD ND INCH SCH20 SCH40 SCH80 STD XS
Weight Weight Weight Weight Weight
88.9 80 3 0.66 0.92 0.66 0.92
114.3 100 4 1.17 1.67 1.17 1.67
141.3 125 5 1.91 2.78 1.91 2.78
168.3 150 6 2.9 4.47 2.9 4.47
219.1 200 8 4.09 5.19 8.05 5.19 8.05
273 250 10 6.36 9.15 12.5 9.15 12.5
323.8 300 12 9.08 14.4 26.8 13.2 17.3
355.6 350 14 13.2 18.8 34.5 15.9 20.4
406.4 400 16 16.8 26.7 47.7 20.4 26.3
457.2 450 18 24.8 41.8 67.7 25.9 33.6
508 500 20 32.2 54.9 91.3 32.2 42.7
558.8 550 22 37.7 49.9
609.6 600 24 46.3 93.1 155 46.3 59.5

Based on different materials, pipe caps include carbon steel cap, stainless steel cap, and alloy steel cap etc.

Depending on their construction, pipe caps contain threaded cap, tapered cap and anti-roll cap etc.

DIN 2617 Pipe End Cap Dimensions
    WDR      
    3 4 5  
DN d1 s s s h
15 21.3 2 3.2 4 25
20 26.9 2.3 3.2 4 25
25 33.7 2.6 3.2 4 38
32 42.4 2.6 3.6 4 38
40 48.3 2.6 4 5 38
50 60.3 2.9 4.5 5.6 38
65 76.1 2.9 5 7.1 38
80 88.9 3.2 5.6 8 51
100 114.3 3.6 6.3 8.8 64
125 139.7 4 6.3 10 76
150 168.3 4.5 7.1 11 89
200 219.1 6.3 8 12.5 102
250 273 6.3 8.8 14.2 127
300 323.9 7.1 10 16 152
DIN 28011 Pipe End Cap Dimensions

ISO - dimensions

dimensions d1 x s height L weight / kg
21,3 x 2,0 9,0 0,01
26,9 x 2,0 9,0 0,01
33,7 x 2,0 13,0 0,02
42,4 x 2,0 13,0 0,04
48,3 x 2,0 13,5 0,05
60,3 x 2,0 18,5 0,07
76,1 x 2,0 20,5 0,10
88,9 x 2,0 25,0 0,15
114,3 x 2,0 28,0 0,26
114,3 x 3,0 29,0 0,39
139,7 x 3,0 38,5 0,60
168,3 x 3,0 47,5 0,90
219,1 x 3,0 63,5 1,32
273,0 x 3,0 93,0 1,95
323,9 x 3,0 102,0 2,70
355,6 x 3,0 109,0 3,80
406,4 x 3,0 123,0 5,00
457,2 x 3,0 123,0 6,10
508,0 x 3,0 133,0 7,60
Metric dimensions
dimensions d1 x s height L weight / kg
20,0 x 2,0 9,0 0,02
25,0 x 2,0 9,0 0,03
30,0 x 2,0 13,5 0,03
35,0 x 2,0 13,5 0,04
44,0 x 2,0 15,0 0,04
54,0 x 2,0 15,0 0,05
70,0 x 2,0 19,5 0,07
84,0 x 2,0 24,0 0,15
104,0 x 2,0 28,0 0,20
129,0 x 2,0 37,0 0,36
154,0 x 2,0 43,0 0,50
156,0 x 3,0 44,0 0,94
204,0 x 2,0 62,0 0,80
206,0 x 3,0 63,0 1,20
254,0 x 2,0 72,0 1,30
256,0 x 3,0 73,0 1,95
306,0 x 3,0 83,0 2,50

Cap geometry

Out diameter High size Wall thickness accord to 'E'
DN NPS E E1 E
15 1/2 25 25 3.73
20 3/4 25 25 3.91
25 1 38 38 4.55
32 11／4 38 38 4.85
40 11／2 38 38 5.08
50 2 38 44 5.54
65 21／2 38 51 7.01
80 3 51 64 7.62
90 31／2 64 76 8.08
100 4 64 76 8.56
125 5 76 89 9.53
150 6 89 102 10.97
200 8 102 127 12.7
250 10 127 152 12.7
300 12 152 178 12.7
350 14 165 191 12.7
400 16 178 203 12.7
450 18 203 229 12.7
500 20 229 254 12.7
550 22 254 254 12.7
600 24 267 305 12.7
650 26 267 　 　
700 28 267 　 　
750 30 267 　 　
800 32 267 　 　
850 34 267 　 　
900 36 267 　 　
950 38 305 　 　
1000 40 305 　 　
1050 42 305 　 　
1100 44 343 　 　
1150 46 343 　 　
1200 48 343 　 　

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Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.


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