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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End connections of fittings are required to comply with pipe ends, either socket weld to plain end, or NPT & BSP screwed end. Combined connection such as socket weld x threaded can be customized upon request.

Carbon Steel & LTCS Forged Fittings

Specification

ASTM A105 & A694 and A350 are the specification of these fittings. These are manufactured by the metal forging process.

Standard

Forged steel fittings are made in accordance with ASME B16.11, MSS-SP-79\83\95\97, and BS3799 standards. Forged pipe fittings are used to build connection, between nominal bore schedule pipe and pipelines.

Ordering

When you are purchasing forged steel fittings, you need to know some details, such as size, pressure rating, material, type and end connection. There is no need to specify seamless/welded construction, because they are forged. Seamless and welded type are applied to butt weld fittings.

Process

Forged Fittings Manufacturing Process

From the name we can know that is Forging. This process of forging, heats carbon steel that is placed between dies, which molds the heated piece of steel into its desired shape. This shape is then bored and machined into a forged steel fitting.

Material

Forged pipe fittings are typically available in two materials: carbon steel (ASTM A105 material spec), and stainless steel SS316 (ASTM A182 material spec). The surface of carbon steel A105 forged pipe fittings may be further reinforced against corrosion through galvanizing. This is an optional add-on which customers may include at an additional cost.

Marking & Packing

To make sure there is no damage during transit, we pack them into cartons and wooden cases. All carbon steel forged fittings are marked with logo, size, grade and heat No. We also can do customized marking as customer’s request.

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Types of Carbon Steel Pipe Reducer

Carbon Steel Concentric Reducer

Concentric Reducer

The concentric reducer is made with both inlet and outlet on a common center line. Compare with eccentric type, it is less costly to manufacture adaptable to most piping installations.

Carbon Steel Eccentric Reducer

Eccentric Reducer

The eccentric reducer has the reducing outlet end off center. In contrast with concentric reducer, that can be hung or suspended flush against a flat ceiling or wall.

Specification for ASTM A234 Pipe Fittings

Specification: ASTM A234 / ASME SA234

Size: 1/2″, 1″, 2″, 3″, 4″, 6″, 8″, 10″, 12″, 16″, 20″, 24″ to 60″

Schedule: Sch 20, STD, Sch 40, XS, Sch 80, Sch 160, XXS

End: Plain or Bevel

Type: Seamless and Welded Pipe Reducer

Material & Grades

ASTM A234 WPB Concentric Reducer

A420 WPL6 Eccentric Reducer

A860 WPHY 42/46/52/56/60/65/70 Pipe Reducer

Butt Weld Reducer Weight Chart

The weight chart is available in concentric and eccentric reducer which based on the ASME / ANSI B16.9 . The weight for the size more than DN1200 (NPS 48) is calculated on the basis of thickness 9.53mm.

What is Buttweld Pipe Reducer?

Steel pipe reducer is used in piping system to change the diameter of pipe. ANSI / ASME B16.9 Butt weld pipe reducer is an pipe connector or pipe joint that reduces the size of pipe from larger diameter to smaller. The reduction in size is mainly equal to the average smaller and larger pipe diameter. It comes in two types that Concentric Reducer and Eccentric Reducer. The Concentric Pipe Reducer is used in vertical piping system. The Eccentric Pipe Reducer is used in horizontal piping system.

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A pipe tee is also called triplet,three way and “T” pieces and it can be used to either combine or split a fluid flow. There are two types that equal tee and reducing tee.

Equal Tee vs Reducing Tee

Reducing Tee vs Equal Tee

Equal tee has same inlet and outlet sizes, but reducing tees has the one or two ends different in dimension. Due to this, that makes the tee fittings with the capacity to control the volume when required.

Equal Tee Weight Chart

The weight unit is kg/pcs. It covers all types of equal tee, such as socket weld, threaded and butt weld.

How Many Types of Carbon Steel Pipe Tee?

Socket Weld Tee

Socket weld tees have a recess for the pipe to slip into, after which a back weld is applied to hold the pipe in the fittings. These fittings are formed by either upset forging or drop forging method.

Supply Range

Size: 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1 1/2″, 2″, 2 1/2″, 3″, 4″.

Standard: ASME B16.11 & BS3799

Pressure Rating: Class 3000, 6000, 9000

Surface: Anti-rust Oil

Coating: Galvanized Socket Weld Tee

Carbon Steel Threaded Tee

Threaded tees are used in low and high pressure systems. These fittings allow quick construction and frequent disassembly and assembly for repairs.

Supply Range

Size: 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1 1/2″, 2″, 2 1/2″, 3″, 4″.

Standard: ASME B16.11 & BS3799

Pressure Rating: 2000lb, 3000lb, 6000lb

Thread Type: NPT, BSPP, BSPT

Surface: Anti-rust Oil and Galvanized.

Carbon Steel Butt Weld Tee

We made butt weld tees by wrought materials in both seamless and welded construction. Welding the tee fittings to the pipe causes it to be leak-proof, adds strength, utilizes a small amount of space and minimizes the possibility of erosion and corrosion

Supply Range

Standard: ASME B16.9, SH3408, HG/T21635, HG/T21631, SY/T0510

Size: 1/2″, 1″, 2″, 3″, 4″, 6″, 8″, 10″, 12″, 16″, 20″, 24″ to 60″

Schedule: Sch 20, STD, Sch 40, XS, Sch 80, Sch 100, Sch 120, Sch 140, Sch 160, XXS

End: Plain ( PE)  or Bevel (BE)

Surface: Blasting and Painting, PE Coating, Hot Dip Galvanized.

Carbon Steel Grades

Butt Weld Fittings

ASTM A234 WPB Reducing Tee

ASTM A420 WPL6 Equal Tee

A860 WPHY42 Reducing Tee

ASTM A860 WPHY 52 Equal Tee

ASTM A860 WPHY 60 Reducing Tee

ASTM A860 WPHY 65 Equal Tee

Forged Steel Fittings

ASTM A105 Socket Weld Tee

A350 LF2 & LF3 Forged Steel Tee

A694 F52 & F60 Threaded Pipe Tee

694 F65 &  F70  Class 3000LB Screw Tee

The post Carbon Steel Tee appeared first on Quality Manufacturer of Industrial Pipe Fittings.

We have supplied our buttweld fittings to major customers which business in Oil & Gas, Chemical & Petrochemical, Water treatment, Nuclear & Power Plant, Offshore platform & Shipbuilding. Our products are applicable for any kinds of severe operating condition such as high pressure and high temperature or cryogenic condition.

Supply Range of Carbon Steel Pipe Elbow

Standard: ASME B16.9, SH3408, HG/T21635, SY/T0510

Size: NPS 1/2″ to 48″ / DN 15 to 1200

Schedule: Sch 20, 40, STD, 80, 160, XXS

Designation: ASTM / ASME A234, A860, A420

Grade: WPB/C, WPHY 42, 46, 52, 60, 65, 70, WPL 3, 6, 9

Type: Seamless Elbow and Weld Elbow

Manufacturing standards and materials

The manufacturing of carbon steel elbows usually follows international and domestic standards to ensure product quality and interchangeability. The most common standards are:

ASME B16.9: This is the most important factory-made butt-weld pipe fittings standard, which specifies the dimensions, tolerances, markings, etc. of elbows.

ASTM A234: Specifies the material specifications for carbon steel and alloy steel seamless and welded pipe fittings for medium and high temperature services. Among them, the most common carbon steel grade is WPB (Welded Pipe Bending). ASTM A234 WPB means that the elbow is made of carbon steel, formed by processes such as welding or pushing, suitable for medium and high temperature services, and has good mechanical properties and weldability.

Carbon Steel Chemical Properties

The common used carbon steel grades are ASTM A234 WPB and A420 WPL6 For low temperature service.

Classification by Angle:

90 degree elbow: Most commonly used, used to achieve a right-angle turn in the pipe.

45 degree elbow: Used to achieve a 45 degree turn in the pipe.

180 degree elbow: Also called a U-shaped elbow or return bend, used to achieve a 180 degree direction change in the pipe, commonly found in heat exchangers and coils.

Other angle elbows: There are also non-standard angle elbows such as 22.5 degrees and 60 degrees, which can be customized according to specific design requirements.

Long Radius Elbow

Fittings that change direction in a piping system are called elbows which available in 90 degree and 45 degree long radius elbow. Both of them has the center line at 1.5 x NPS from elbow end.

Long Radius vs Short Radius

Short Radius Elbow

Short radius elbow almost same as above long radius,  the difference is center line to end is 1 x NPS and available in 90 degree only.

Surface of Carbon Steel Elbow

Painting

Firstly, we do the blasting on the body of elbow, to clean the dirt things. Then paint the primer on the inner and outer side. The mainly purpose is against rust during the shipment.

PE Coating

Clean the steel pipe elbow body and wrap the polyethylene tape on it with adhesive. Usually the thickness of coating is 2mm. They are used in the underground pipeline system.

Galvanizing

Take carbon steel buttweld fittings into a bath of molten zinc. That would get more zinc and make the price is high.

We surfaced carbon steel forged fittings with electrogalvanizing because it is pretty and low cost.

Application Areas

Oil and gas industry: Pipelines for oil and gas transportation, refineries and gas processing plants.

Chemical and petrochemical industry: piping systems for the transport of non-corrosive or slightly corrosive chemicals.

Power industry: water, steam and fuel piping in thermal power plants.

Building and civil engineering: Used in a large number of daily piping projects such as water supply and drainage, fire protection systems, heating, ventilation and air conditioning (HVAC).

Marine and Offshore: Piping for ship interiors and offshore installations.

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Quality leading manufacturer, exporter, supplier Zizi offers ASTM A234 WPB Seamless Concentric Reducer for Thailand, dimensions & weight also be provided. Seamless Pipe Reducers are available in a variety sizes and designed for connection of different ventilation components

A234 WPB Pipe Fittings are butt welding ends, commonly used to be welded with the Steel Pipes of A106, A53,GR.B,or API 5L GR.B material.

Zizi Engineering is one of the prominent stockist of carbon steel seamless pipe fittings and welded pipe fittings.

ASTM A234 WPB Chemical Composition

ASTM A234 WPB Mechanical Property

A234 WPB Concentric Reducer Equivalent Chart

Carbon Steel Concentric Reducer Dimensions

A234 WPB Concentric Reducer Dimensions

Standard: ASME/ANSI B16.9

Size: 3/4″ to 48″

Thickness: Sch 20, STD, 40, XS, Sch 80, 120, 160

Technical: Seamless and Weld Concentric Reducer

Surface:Blasting and Painting, Galvanized, PE Coated.

Grade: ASTM A234 WPB, A860 WPHY42 / 52 / 60 / 65 / 70, ASTM A420 WPL 3 / 6 / 9.

Standard Pipe Reducer Weight Chart

How to Calculate Weight of Concentric Reducer

Calculation Formula: 0.02466 × S ×[ (D+d)/2-S] × H / 1000

S: Wall thickness in mm.

D: Outside diameter of the larger end in mm.

d: Outside diameter of the small end in mm.

H: End to end dimension in mm.

What is the meaning of WPB in ASTM A234?

W=Wrought (Weldable)

P=Related To P Number of Alloy Material

B= Refer to Minimum Yield of Material

ASTM A234 specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction. The material for fittings shall consist of killed steel, forgings, bars, plates, seamless or fusion-welded tubular products with filler metal added.

Carbon Steel Buttweld Fittings

Package of Butt Weld Pipe Fittings

We marked Carbon Steel Buttweld Fittings with Grade, Lot No, Size, Standard and Schedule Thickness. ASTM A234 WPB Concentric Reducer is blasting, painting and marking, then packed into wooden case, bundled wooden cases with nylon rope.

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 of ASTM A234 WPB Concentric Reducer

Schedule 160 Concentric Reducer Inspection

1. Visual the surface if smooth.
2. Check the marking if correct.
3. Measure dimensions if in tolerance.

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