Carbon steel pipe cap is also known as head cap which is used to weld or install on the male thread of end of pipes for blocking the pipelines. It has same function as plug and blind flange.

Steel pipelines includes pipes, fittings, flanges, gaskets, valves, bolts and nuts. It is important to select proper piping material to ensure system safety and durability at appropriate cost.

We can produce pipe fittings & flanges in customized size as per customer required. Usually stock the dimensions in accordance with standards of ASME B16.9, B16.5, B16.11 & BS3799.  Our goods are good for waterproof the connections to avoid leakage, and laso can work high pressure and temperature situation.

Main Functions

Closing and Sealing: The primary function is to permanently or temporarily close the open end of a pipeline to ensure the integrity and tightness of the piping system. This is crucial for pipelines conveying liquid or gaseous media, and can effectively prevent leakage.

Safety: Closing off the end of a pipe prevents foreign objects from entering the interior of the pipe and protects equipment and fluids from contamination. In some cases, it can also prevent accidental contact with hazardous media in the pipeline.

Pressure Testing: When a piping system is being tested for water or air pressure, the cap is used to enclose the piping so that the inside of the system can withstand the test pressure.

Future Expansion: Some piping systems are designed to allow for future expansion connections, which are closed with a cap and then removed and connected to the new piping when needed.

Types of Carbon Steel Pipe Cap

• Carbon Steel Butt Weld Cap
• Stainless Steel Socket Weld Cap
• Carbon Steel Threaded Pipe Cap

ASME B16.9 End Cap Dimensions

ANSI / ASME B16.9 Standard 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) and thickness Schedule 10, 20, 30, STD, 40, 60, XS, 80, 100,120,140,160, XXS.

Buttwelding Cap Drawing

ASME B16.11 Socket Weld Cap Dimensions

ANSI / ASME B16.11 Standard covers ratings, dimensions, tolerances, marking and material requirements for socket-welding and threaded forged fittings. These fittings are designated as Class 2000, 3000, and 6000 for threaded pipe fittings and Class 3000, 6000, and 9000 for socket weld fittings. B16.11 is to be used in conjunction with equipment described in other volumes of the ASME B16 series of standards as well as with other ASME standards, such as the Boiler and Pressure Vessel Code and the B31 Piping Codes.

Socket Weld Cap Drawing

DN	NPS	B	C						J	K
			3000		6000		9000			3000	6000	9000
			ave	min	ave	min	ave	min
6	1/8	10.9	3.18	3.18	3.96	3.43			9.5	4.8	6.4
8	1/4	14.3	3.78	3.3	4.6	4.01			9.5	4.8	6.4
10	3/8	17.7	4.01	3.5	5.03	4.37			9.5	4.8	6.4
15	1/2	21.9	4.67	4.09	5.97	5.18	9.53	8.18	9.5	6.4	7.9	11.2
20	3/4	27.3	4.9	4.27	6.96	6.04	9.78	8.56	12.5	6.4	7.9	12.7
25	1	34	5.69	4.98	7.92	6.93	11.38	9.96	12.5	9.6	11.2	14.2
32	1 1/4	42.8	6.07	5.28	7.92	6.93	12.14	10.62	12.5	9.6	11.2	14.2
40	1 1/2	48.9	6.35	5.54	8.92	7.8	12.7	11.12	12.5	11.2	12.7	15.7
50	2	61.2	6.93	6.04	10.92	9.5	13.84	12.12	16	12.7	15.7	19
65	2 1/2	73.9	8.76	7.62					16	15.7	19
80	3	89.9	9.52	8.3					16	19	22.4
100	4	115.5	10.69	9.35					19	22.4	28.4

Threaded Cap Drawing

Threaded Pipe Cap Dimensions

DN	NPS	P		D		G		L5	L2
		3000	6000	3000	6000	3000	6000
6	1/8	19	–	16	22	4.8	–	6.4	6.7
8	1/4	25	27	19	25	4.8	6.4	8.1	10.2
10	3/8	25	27	22	32	4.8	6.4	9.1	10.4
15	1/2	32	33	28	38	6.4	7.9	10.9	13.6
20	3/4	37	38	35	44	6.4	7.9	12.7	13.9
25	1	41	43	44	57	9.7	11.2	14.7	17.3
32	1 1/4	44	46	57	64	9.7	11.2	17	18
40	1 1/2	44	48	64	76	11.2	12.7	17.8	18.4
50	2	48	51	76	92	12.7	15.7	19	19.2
65	2 1/2	60	64	92	108	15.7	19	23.6	28.9
80	3	65	68	108	127	19	22.4	25.9	30.5
100	4	68	75	140	159	22.4	28.4	27.7	33

Forged Carbon Steel Cap

Forged carbon steel fittings caps are made from steel rod by forging, there are two connection types that socket weld and threaded.

The orignal material material grades :

ASTM A105

ASTM A350 LF2 / LF3

A694 F42, F46, F50, F52, F56, F60, F65, F70.

The surface coating can be hot dip galvanized and cold galvanized,  the hot dip galvanizing have long life but not pretty, while cold galvanizing oppositly.

Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo	Cu	N	V
ASTM A105	0.35	0.6-1.05	0.035	0.04	0.1-0.35	0.4	0.3	0.12	0.4	–	0.08
A350 LF2	0.3	0.6-1.35	0.035	0.04	0.15-0.30	0.4	0.3	0.12	0.4	0.02	0.08
A350 LF3	0.2	0.9	0.035	0.04	0.2-0.35	3.3-3.7	0.3	0.12	0.4	0.02	0.03
A694 F42	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F46	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F50	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F52	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F56	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F60	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F65	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–
A694 F70	0.3	1.6	0.025	0.025	0.15-0.35	–	–	–	–	–	–

Mechnical Properties

Grade	Y.S (Mpa)	T.S (Mpa)	EL (%)
ASTM A105	250	485	22
A350 LF2	205	415-585	22
A350 LF3	250	485-655	22
A694 F42	290	415	20
A694 F46	315	415	20
A694 F50	345	440	20
A694 F52	360	455	20
A694 F56	385	470	20
A694 F60	415	515	20
A694 F65	450	530	20
A694 F70	485	565	18

Carbon Steel Buttwelding Cap

Carbon steel butt weld pipe caps are made from steel plate. It connects steel pipe by welding and the diameter size of pipe cap is larger than forged steel cap.

There are many grades such as ：

ASTM A234 WPB / WPC

WPL6 / 3 / 9

A860 WPHY 42 / 46 / 52 / 60 / 65 /70.

Usually we use coating of primer and galvaning on buttweld cap against rust. The primer could be normal, FBE, EPOXY RESIN, while the galvaning is hot dip type.

Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo	Cu	Ti	V
A234 WPB	0.3	0.29-1.06	0.05	0.058	0.1 min	0.4	0.4	0.15	0.4	–	0.08
A234 WPC	0.35	0.29-1.06	0.05	0.058	0.1 min	0.4	0.4	0.15	0.4	–	0.08
A420 WPL6	0.3	0.5-1.35	0.035	0.04	0.15-0.4	0.4	0.3	0.12	0.4	–	0.08
A420 WPL3	0.2	0.31-0.64	0.05	0.05	0.13-0.37	3.2-3.8	–	–	–	–	–
A420 WPL9	0.2	0.4-1.06	0.03	0.03	–	1.6-2.24	–	–	0.75-1.25	–	–
A860 WPHY42	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1
A860 WPHY46	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1
A860 WPHY52	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1
A860 WPHY60	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1
A860 WPHY65	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1
A860 WPHY70	0.2	1-1.45	0.03	0.01	0.15-0.4	0.5	0.3	0.25	0.35	0.05	0.1

Mechnical Properties

Grade	Y.S (Mpa)	T.S (Mpa)	EL (%)
A234 WPB	240	415-655	22
A234 WPC	275	485-655	22
A420 WPL6	240	415-655	22
A420 WPL3	250	450-620	22
A420 WPL9	315	435-610	20
A860 WPHY42	290	415	20
A860 WPHY46	315	415	20
A860 WPHY52	360	455	20
A860 WPHY60	415	515	20
A860 WPHY65	450	530	20
A860 WPHY70	485	565	18

Areas of Application

Carbon Steel Pipe Caps are widely used in industry due to their cost-effectiveness, moderate strength and good weldability:

Oil & Gas: Used for end closure of piping systems, such as temporary plugging, permanent end closure or pressure testing.

Chemical and petrochemical: piping systems conveying all kinds of chemicals need reliable seals to prevent leakage.

Power: Water, steam and fuel piping in power plants.

Building and Structural: End caps used to enclose piping or as structural support in construction projects.

WATER TREATMENT: Water supply and drainage systems, sewage treatment plants, etc.

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Galvanized pipe cap fittings are used in most applications with the exception of underground lines, they have the ability to protect against corrosion and salt. But they should not be used with gas application.

We take steel pipe cap to act as protective device to close off end of pipe and stop the flow of fluids.

What is Galvanized Steel Pipe?

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We have abundant stock of stainless steel threaded pipe fittings, such as 3 inch Threaded Cap, 1 inch BSP Coupling and SS 316 90 Degree Threaded Elbow.

Threaded Cap Definition

They are a pipe fittings that cover the pipe end to block off the pipeline by thread.Usually suitable for serving small diameter pipes which below 4 inch. The main characteristic are Beautiful Appearance and Good Mechanical Properties.

3 Threaded Pipe Cap Dimensions

3 Threaded Pipe Cap Dimensions

Standard: ASME B16.11, BS3799, GB/T14626

Diameter: 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″, 3″, 4″

Pressure Ratings: 3000LB, 6000LB

Thread Type: NPT, BSPP, BSPT, PT, PF

Surface: Anti-rust Oil and Galvanized

Threaded Pipe Cap Weight

Threaded Pipe Cap Weight

Material Grades of 4 NPT Pipe Cap

Alloy Steel Threaded Cap

ASTM A182 F1, F5, F9, F11, F12, F22, F91

Duplex Steel Threaded Cap

ASTM A182 F51, F53, F55, F56, F57

Carbon Steel Threaded Cap

ASTM A105, A694 F52, F60, F65, F70, A350 LF2, LF3

Stainless Steel Threaded Cap

ASTM A182 F304/304L/F304H, F316/316L, F310, F317, F321, F309

NPT Threaded Pipe Fittings

NPT Threaded Pipe Fittings

Package of Stainless Steel Threaded Fittings

We marked all Stainless Steel Threaded Fittings with Grade, Lot No, Size, Standard and Pressure. The workers sleeved 3 inch NPT Threaded Cap SS 316 into plastic bag individually, put all of them into cartons and wooden cases, then bundled package with nylon rope.

Clear labels are tagged on the outside of the package for easy identification of the quantity and product. Great care is taken during operation and transportation.

Inspection of Threaded Cap

Visual the surface of threaded cap body. Such as dents, die marks, porosity, undercuts.

Check the marking. Such as size, material code, grade, thickness, heat no.

Measure dimensions. Such as outside diameter, wall thickness, height from end to end.

Test the chemical composition of stainless steel threaded caps.

Test the thread by go/no gauge 

Benefits of Stainless Steel

• Corrosion resistance
• Aesthetic appearance
• Easy of fabrication
• Impact resistance
• Long term value
• Sustainability

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We are a top quality manufacturer of large diameter steel pipe fittings and export seamless pipe cap 20″ x 8mm ASTM A234 WPB ASME B16.9 to Singapore.

There are two types that seamless and weld. Usually the diameter of pipe fittings is larger than 24 inch, they are weld fittings, otherwise they are most seamless fittings. What are these large diameter fittings? They are 90 degree and 45 degree elbows, long and short radius elbows, equal and reducer tees, concentric and eccentric reducers, steel pipe caps.

ASME B16.9 Cap Dimensions

ASME B16.9 Cap Dimensions

Standard: ASME/ANSI B16.9

Thickness: Sch 10, 20, STD, 40, 80, 100, 120, 140, 160, XXS

Technical: Seamless and Weld Cap

End Type: BE and PE

Surface: Black Primer, Galvanized and PE Coated

Material Grades of Large Diameter Steel Pipe Cap

Stainless Steel: ASTM A403 WP304/304L, WP304H, WP316/316L, WP310, WP317, WP321

Duplex Steel : ASTM A815 UNS S 31803, S 32205, S 32550, S 32750, S 32760

Carbon Steel: ASTM A234 WPB, A860 WPHY 42, 52, 60, 65, 70

Low Temp Carbon Steel: ASTM A420 WPL3,WPL6, WPL9

Alloy Steel: ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91

Steel Pipe Cap Weight

Steel Pipe Cap Weight

20 Inch Steel Pipe Fittings

Package

We marked all ASTM A234 Pipe Fittings with Grade, Lot No, Size, Standard and Schedule Thickness. Our workers painted 20 Inch Steel Pipe Cap with black primer, then packed large diameter steel pipe caps into wooden pallets or cases.

20 Inch Steel Pipe Cap Package

Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. great care is taken during operation and transportation.

Inspection

1. Visual the surface of cap fittings body. Such as dents, die marks, porosity, undercuts etc.
2. Check the marking. Such as size, material code and grade, thickness, heat no.
3. Measure the size of large steel pipe cap. Such as the diameter, thickness, height of end to end.

Advantages

• Good Quality
• Fast Delivery
• Safe Package
• Abundant Stock
• Reasonable Price
• Reliable Shipment

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Large quantity Stainless Steel Pipe Cap are in stocks, they are dimensional accuracy, high quality and cost effective, the dimensions can be customized to meet your needs.

As most stainless steel butt weld fittings, SS 316/316L Pipe cap has advantages of high strength, excellent corrosion resistance, long service life and stable and leak proof joint. It is often used to stop the flow at pipes end or protect pipes when transportation. With great performance in ordinary and corrosive environment, its price is more expensive.

6 Inch Pipe Cap Dimensions

6 Inch Pipe Cap Dimensions

Standard: ASME/ANSI B16.9, B36.19

Thickness: Sch 10S, 20, STD, 40S, 80S, 100, 120, 140, 160, XXS

Technical: Seamless and Weld Cap

End Type: BE and PE

Material Grades of Steel Pipe End Cap

Stainless Steel Cap: ASTM A403 WP304/304L, WP304H, WP316/316L, WP310, WP317, WP321

Duplex Steel Cap: ASTM A815 UNS S 31803, S 32205, S 32550, S 32750, S 32760

Carbon Steel Cap: ASTM A234 WPB, A860 WPHY42, 52, 60, 65, 70

Low Temp Carbon Steel Cap: ASTM A420 WPL3,WPL6, WPL9

Alloy Steel Cap: ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91

Common Types

Types of stainless steel pipe caps are usually categorized according to their manufacturing process and connection method:

Butt Weld Cap:

Characteristics: With a beveled end, connected to the pipe by butt welding to form a strong, seamless connection.

Advantages: high strength, excellent sealing performance, suitable for high pressure, high temperature, low temperature and stress changes in the pipeline system.

Applications: Oil and gas, chemical, electric power, marine engineering and other industries that require high quality and safety of connections.

Threaded Cap:

Characteristics: Bore with a thread, through the thread with the same threaded pipe connection.

Advantages: no welding, very easy to install and dismantle, suitable for low-pressure, non-hazardous media or the need for frequent dismantling and maintenance occasions.

Applications: general civil piping, some industrial auxiliary piping, instrumentation connections, etc.

Socket Weld Cap:

Features: with socket, pipe inserted into the socket, through the external fillet weld connection.

Advantages: strength higher than the threaded flange, good sealing, suitable for small diameter, medium and high pressure pipelines.

Applications: chemical, pharmaceutical, instrumentation piping, etc., especially in the strict control of leakage occasions.

Steel Pipe Cap Weight

Stainless Steel Buttweld Fittings

Package of 316 Stainless Steel Pipe Cap

Package

We marked all 316 Stainless Steel Buttweld Fittings with Grade, Lot No, Size, Standard and Schedule Thickness. Our workers wrapped 6 Inch Pipe Cap with plastic foam bag, then packed caps into wooden pallets or cases.

Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. great care is taken during operation and transportation.

Inspection

1. Visual the surface of buuweld fittings body. Such as dents, die marks, porosity, undercuts.
2. Check the marking. Such as size, material code, material grade, thickness, heat no.
3. Measure dimensions. Such as outside diameter, wall thickness, height from end to end.
4. Test chemical properties of stainless steel pipe cap.

Advantages 

• Good Quality
• Fast Delivery
• Safe Package
• Abundant Stock
• Reasonable Price
• Reliable Shipment

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Zizi is a manufacturer and supplier of alloy steel weld on pipe end cap, top quality will be guaranteed by our skilled workers and professional technicians.

This fitting is design to use in moderate and high temperature service. Buttweld Pipe Caps are available in a wide range of dimensions and materials that are complied with national and international standards and grades.

Alloy Steel Buttweld Fittings

Why alloy steel A234 WP9 is prevalent for many fittings applications? We are sure it’s their advantage features.

1. Resistant to rust and aqueous media.
2. High tensile strength.
3. Large application range.
4. Long service life.

Weld On Metal Pipe Caps

Weld On Metal Pipe Caps

Stainless Steel Buttweld Cap

ASTM A403 WP304/304L, WP304H, WP316/316L, WP310, WP317, WP321

Duplex Steel BW Cap

ASTM A815 UNS S 31803, S 32205, S 32550, S 32750, S 32760

Carbon Steel End Cap

ASTM A234 WPB, A860 WPHY42, 52, 60, 65, 70

Low Temp Carbon Steel Cap

ASTM A420 WPL3, WPL6, WPL9

Alloy Steel Pipe Cap

ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91

ASME B16.9 Cap Dimensions

ASME B16.9 Cap Dimensions

Standard: ASME/ANSI B16.9

Diameter: DN20 to DN1500/ 3/4″ to 60”

Thickness: Sch 10, 20, STD, 40, 80, 100, 120, 140, 160, XXS

Technical: Seamless and Weld Cap

Surface: Anti-rust Oil, Galvanized, Black Primer.

Pipe Cap Weight Chart

Pipe Cap Weight Chart

Low Alloy Steel Fittings

Package

We marked all A234 WP9 Buttweld Fittings with Grade, Lot No, Size, Standard and Schedule Thickness. Our workers wrapped 6 Inch Weld on Pipe Cap with water-proof material then packed them into wooden cases or pallets.

Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. Great care is taken during operation and transportation.

Inspection

1. Visual the surface of  pipe cap body. Such as dents, die marks, porosity, undercuts.
2. Check the marking. Such as size, material code, grade, thickness, heat no.
3. Measure the dimensions. Such as diameter, thickness, height from end to end.
4. Test the chemical properties of alloy steel pipe fittings.

Advantages

• Good Quality
• Fast Delivery
• Safe Package
• Abundant Stock
• Reasonable Price
• Reliable Shipment

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