How to get high quality pipe cap?

What is a 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.


Common Shapes of pipe caps:
Pipe caps are available in various shapes. Having an intense knowledge about the shape of pipe cap would be beneficial for the buyer. Some of the common shapes of pipe caps are: 

  • Round
  • Square
  • Rectangular
  • “U” Shape Cap
  • “I” Shape Cap
  • Hex Cap etc.

Features of pipe caps:
There are several important specifications that the buyer should consider before making bulk purchase of pipe caps. The important specifications that needs to be considered are: 

  • NPT (National Pipe Thread ) size: This feature is applicable for round shaped caps, wherein the object that has to be protected has a male NPT thread.
  • BSP (British Standard Pipe) size: This size option is applicable only for round shaped caps, wherein the object to be capped has a male BSP thread.
  • Diameter: Diameter is an important dimension that is applicable only for round caps and plugs. In case of fittings having straight threads, the most important feature to be considered is the major thread diameter. However, this dimension is not an important consideration when cap, plug or object to be capped has a tapered (NPT or BSP) thread.
  • Shape: The dimension and shape of pipe caps are also very important points to consider. Pipe caps of different shapes have different features. 

Some features are:

  • A.Round Caps: Popular features of round caps are: flange, slotted head, knurled or faceted head, retaining head, and tear tab. A flange is meant for easy removal or additional protection of pipe or tube surfaces. Flanges also help to prevent accidental pushing away of the plug through the opening. Slotted caps can be easily installed or removed with the help of a screwdriver. Knurled or faceted heads are usually designed for threaded caps and plugs only. Knurls or facets offer hassle free installation and removal. Pipe caps provided with a tear-tab or strip are easy to remove.
  • B.Square or Rectangular Cap: For square or rectangular caps, length and width are the most important dimensions to consider. For rectangular caps, the width is the smaller cross sectional dimension, whereas for square caps, the length and breadth are the same dimension.

Types of pipe caps:
Pipe caps come in many different types and the type vary according to the application. However pipe caps also vary depending on their construction features and it is very important for the buyer to know the right type of pipe cap. Based on construction, pipe caps are of the following types:

Threaded Caps:
These caps are female threaded. The thread can be either straight or tapered, also referred as NPT. Generally, caps have a female thread and plugs have a male thread.

Tapered Caps:
These caps have tapered sides, which offers a close fit. Some of these fittings can be used either as a cap or a plug. Tapered caps and plugs are multi-functional and go well with male and female NPT threads, straight tubes and bars; and male straight threads. These fittings have a tapered body to provide a secure and firm friction fit while facilitating easy removal. The tapered caps are designed to provide protection for all internal and external, threaded and non-threaded fittings against damage, dirt or moisture that can occur.

Anti-roll Caps:
These caps are round in shape with a slightly square end. This prevents pipes and tubes from rolling.

Carbon steel end caps
carbon steel cap 1 - How to get high quality pipe cap?
Carbon Steel caps

Carbon steel caps are usually used for protecting the end of pipe and other fittings, so the shape is designed according to the shape of pipe line.

These Carbon steel caps are widely well-known for the utmost output and outstanding results that it gives.

Carbon steel caps manufactured using superior grade raw materials. Carbon steel caps are used for connecting pipes of different diameters and find wide applications in various chemicals, construction industries, paper, cement & ship builders.

Large size end caps

These Large size caps are widely well-known for the utmost output and outstanding results that it gives.

Socket pipe cap

Socket welding pipe cap also known as high pressure pipe cap, forging steel pipe cap, nominal size: 1/4 “- 5”, DN20-DN200, applicable medium: water, steam, oil etc.

Socket pipe cap - How to get high quality pipe cap?

Socket Pipe cap is widely used in nuclear power, chemical, food, pharmaceutical and other industries, the head of pressure vessel is a mechanical element, element is under pressure.

Socket welding pipe cap also known as high pressure pipe cap, forging steel pipe cap, nominal size: 1/4 “- 5”, DN20-DN200, applicable medium: water, steam, oil etc. The socket pipe cap quality directly affects the operation of the pressure vessel. For the forming of tailor-welded before and after the split forming butterfly head welding tests, it is very important.

1,Before forming welding: ensure welding quality (surface testing, pay attention to the welding current, welding method, etc.), the best ray detection. Internal grinding with the base level before stamping. Ray detection after forming. 
2,After the split forming welding: guarantee welding quality (surface testing, pay attention to the welding current, welding method, etc.), radiographic testing. 

Butterfly head is widely used, so the welding head is quite important for butterfly, so at the time of welding head welding technique is very important.

Stainless steel caps

Stainless steel caps are usually used for protecting the end of pipe and other fittings, so the shape is disigned according to the shape of pipe line.

Standard (Norm)
  • Pipe Dimension
  • Pipe Material(Grade)
  • Chemical Composition
  • Mechanical Properties
  • Technology Flow chart
  • Range of Applications
Material Grades:

Also known as “marine grade” stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.

  • 304/304L Stainless Steel
  • 316/316L Stainless Steel
  • 310S Stainless Steel
  • 317L Stainless Steel
  • 321/321H Stainless Steel
  • 410 Stainless Steel
  • Duplex 2205 (UNS S31803)
Vessel heads

Vessel heads: DISHED PLATES, HEADS, TORISPHERICAL HEADS, CAPS.

End cap size data

end cap design - How to get high quality pipe cap?

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

Pipe caps are widely well-known for the utmost output and outstanding results that it gives.

  • Out diameter: 1/2″-60″ DN15-DN1500 
  • Wall Thickness: sch10-80s
  • Pressure: SCH5 to SCH160v
  • Max. wall thickness: 200mm

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

Pipe caps DIN 28011 drawing - How to get high quality pipe cap?
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

The weight of pipe cap 

公称通径
inch
公称通径
DN
外径
D
SCH5s
壁 厚
SCH10s
壁 厚
SCH10
壁 厚
SCH20
壁 厚
SCH30
壁 厚
SCH40s
壁 厚
STD
壁 厚
SCH40
壁 厚
1/8″ 6 10.3 1.24 1.73 1.73 1.73
1/4″ 8 13.7 1.65 2.24 2.24 2.24
3/8″ 10 17.1 1.65 2.31 2.31 2.31
1/2″ 15 21.3 1.65 2.11 2.77 2.77 2.77
3/4″ 20 26.7 1.65 2.11 2.87 2.87 2.87
1″ 25 33.4 1.65 2.77 3.38 3.38 3.38
11/4″ 32 42.2 1.65 2.77 3.56 3.56 3.56
11/2″ 40 48.3 1.65 2.77 3.68 3.68 3.68
2″ 50 60.3 1.65 2.77 3.91 3.91 3.91
21/2″ 65 73.0 2.11 3.05 5.16 5.16 5.16
3″ 80 88.9 2.11 3.05 5.49 5.49 5.49
31/2″ 90 101.6 2.11 3.05 5.74 5.74 5.74
4″ 100 114.3 2.11 3.05 6.02 6.02 6.02
5″ 125 141.3 2.77 3.40 6.55 6.55 6.55
6″ 150 168.3 2.77 3.40 7.11 7.11 7.11
8″ 200 219.1 2.77 3.76 6.35 7.04 8.18 8.18 8.18
10″ 250 273.1 3.40 4.19 6.35 7.80 9.27 9.27 9.27
12″ 300 323.9 3.96 4.57 6.35 8.83 9.53 9.53 10.31
14″ 350 355.6 3.96 4.78 6.35 7.92 9.53 9.53 11.13
16″ 400 406.4 4.19 4.78 6.35 7.92 9.53 9.53 12.70
18″ 450 457.2 4.19 4.78 6.35 7.92 11.13 9.53 14.27
20″ 500 508.0 4.78 5.54 6.35 9.53 12.70 9.53 15.09
22″ 550 558.8 4.78 5.54 6.35 9.53 12.70 9.53
24″ 600 609.6 5.54 6.35 6.35 9.53 14.27 9.53 17.48
26″ 650 660.4 7.92 12.70 9.53
28″ 700 711.2 7.92 12.70 15.88 9.53
30″ 750 762.0 6.35 7.92 7.92 12.70 15.88 9.53
32″ 800 812.8 7.92 12.70 15.88 9.53 17.48
34″ 850 863.6 7.92 12.70 15.88 9.53 17.48
36″ 900 914.4 7.92 12.70 15.88 9.53 19.05
38″ 950 965.2 9.53
40″ 1000 1016.0 9.53
42″ 1050 1066.8 9.53
44″ 1100 1117.6 9.53
46″ 1150 1168.4 9.53
48″ 1200 1219.2 9.53

What is the use of pipe cap?

I believe that when many people hear the word “pipe caps” for the first time will be tiny one leng. What is the pipe cap? What did it look like? What is the use? But for the mechanical workers this pipe cap is more common than the. In fact, the pipe cap is also called plug, head, pipe cap, bulkhead, the name of good let people understand. The pipe fittings are welded on the pipe end or are arranged on the outer thread of the pipe end to cover the pipe. Used to close the pipeline, the same role with the pipe blocking the same.
Blind in the form of a close, but the blind is blocked can be removed, and the welded pipe cap is not removable. The pipe cap includes the design of convex pipe cap, cone shell, reducer, flat cover and tight mouth.
The convex pipe cap includes a hemispherical, oval disc pipe cap, pipe cap and spherical pipe cap. From the stress angle convex pipe cap from the hemispherical pipe cap is not good, but from look on the manufacturing difficulty, has good manufacturing. And pipe cap from the use of classified material generally can be divided into several common copper pipe cap, iron pipe, stainless steel pipe cap, plastic pipe cap, pipe cap!
The pipe cap on the market are very much, because the industry is also very much, at present in many petrochemical, nuclear power, machinery, medical equipment, chemical fertilizer, shipbuilding, waterproofing treatment, pipe, water heating, solar water heaters and other industry need use to pipe cap!
pipe cap according to the classification of the pressure for about seventeen, and American Standard pipe pressure rating is the same, sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, SCH100, sch120, sch140, sch160, XXS. The most commonly used is two kinds of STD and XS. pipe cap in the construction industry not very common, necessary pipe cap just in the end of the pipe for closed pipeline, and the blind plate uses basically the same is blind plate installed can be disassembled, but pipe cap can not disassembled, pipe cap is welded on the top of the pipe, and the blind plate in the form of very close to.
Above is the pipe cap of general use, actually a little attention point can see pipe cap can be divided into many types, so can not be generalized and pipe cap with the head on the literal meaning almost, in fact distinguish is not small: head for devices to a container under the (vertical) equipment part or left and right ends (horizontal) pipe cap are generally outside diameter, pipe caps can be screwed directly in the pipe, does not need other pipe fittings. So use pipe cap introduced today is here.

Delivery requirment:
  • Marking: Yaang, material grade, standard, specification, heat no.
  • Surface Treatment: Bright annealed, polished outside and inside surface.
  • Package: knitting strip bundle, wooden box or steel box
  • Mill test certificate: according to EN 10204 3.2
  • Inspection: Third party inspection, or by clints
Production process of pipe cap: pressing stereotype
One of the most common manufacturing methods for pipe caps, where plate is cut out in a circle and formed by deep drawing.
Pressing stereotype 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. Pressing stereotype involves stretching the metal blank around a plug and then moving it into a moulding cutter called a die.

pressing stereotype 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 pressing stereotype must be malleable as well as resistant to stress and tension damage.

From: www.yaang.com

Source: China Pipe Cap Manufacturer – Yaang pipe fitting Industry Co., Limited (www.ugsteelmill.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@ugsteelmill.com

Please notice that you might be interested in the other technical articles we’ve published:

  • Tips for selecting expansion joints

  • What is the difference between a steel pipe and a steel tube?

  • Engineering Specification for Pressure Test of Piping System

  • How to choose a valve and valve end connection type

  • How to test pipe fitting?

  • Manufacturing process of cold rolled steel pipe

  • Development trend of high pressure pipe fittings

  • How to get high quality flanges

  • How to get high quality pipe fittings

  • How to get high quality bellow expansion joints

  • How to get high quality alloy steel pipes

  • HOW TO GET HIGH QUALITY STEEL PIPES

  • WHAT IS THE DIFFERENCE BETWEEN LATERAL TEE AND TRUE WYE

  • WHAT ARE OUTLET PIPE FITTINGS

  • What are pipe caps

  • WHEN TO USE A SPECTACLE BLIND FLANGE

  • HOW TO GET HIGH QUALITY BOILER TUBES

References:

  • https://www.yaang.com/what-is-the-use-of-pipe-cap.html
  • https://www.yaang.com/what-is-threaded-pipe-cap.html
  • https://www.yaang.com/how-to-connect-pipeline-with-pipe-cap.html
  • http://www.pipingstudy.com/cap.html

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