A234 WPB Large-Diameter Pipe Caps for Pipeline and Boiler Protection

ASTM A234 WPB large-diameter pipe caps are high-performance carbon steel fittings designed to seal the ends of large-diameter pipes, ensuring robust corrosion resistance and protection for pipelines and boiler systems. These caps are critical for boiler pipeline protection and erosion/corrosion resistance in industries such as petrochemical, power generation, chemical processing, and oil and gas.

Compliant with ASME/ANSI B16.9 and ASTM A234 standards, A234 WPB pipe caps are available in sizes up to 72″ (DN1800) and various wall thicknesses (e.g., SCH 40, SCH 80, up to 200 mm). Made from carbon steel (A234 WPB), they offer excellent strength and weldability, with surface treatments like Fusion Bonded Epoxy (FBE), 3LPE, or galvanizing to enhance durability in corrosive environments.

A234 WPB pipe caps undergo rigorous testing, including chemical analysis (A234 WPB: C ≤0.30%, Mn 0.29–1.06%, Si ≥0.10%), tensile testing (YS ≥240 MPa, TS ≥415 MPa), hydrostatic testing (up to 9.8 MPa), and nondestructive methods (radiographic, ultrasonic, PMI). With a density of ~7.85 g/cm³ and suitability for temperatures up to 450°C, these caps excel in high-pressure piping applications like boilers, refineries, and chemical plants.

The butt-welded design ensures secure sealing, making A234 WPB large-diameter pipe caps ideal for protecting pipe ends in harsh, corrosive settings, such as offshore platforms, power generation facilities, and petrochemical systems.

We offer all SA234 WPB Pipe Caps at really low prices with prompt and efficient delivery. Our Carbon Steel ASTM A234 WPB Cap range can meet all your size and grade requirements & ready for immediate despatch. These onsite facilities for CS A234 WPB Cap enable us to offer a large range of testing to suit exact customer requirements and to export all Cap ASTM A234 WPB with 100% weld radiography, without impacting on our short lead-times.

The pipe end cap helps protect the end of the pipes of various shapes, and its main purpose is to make the connections waterproof. The ASTM A234 WPB Pipe End Cap can be used to close the ends of hydraulic or pneumatic pipes and tubes. The ASTM A234 WPB Cap is mostly made of carbon steel with a minimum yield strength of 240MPa and minimum tensile strength of 585MPa, which helps the pipe fit to work in a high stress environment. We are one of the top manufacturers of A234 WPB Pipe Cap where A234 WPB is the standard determination for fittings of fashioned carbon steel and alloy steel for direct and high-temperature services. In addition, we have a vast stock of SA 234 Gr WPB SCH 80 Caps which can find its application in various industries.

A234 WPB Large-Diameter Pipe Cap Specifications
Specification	Details
Standards	ASME/ANSI B16.9, ASTM A234
Type	Butt-Welded, Seamless, Welded
Material	Carbon Steel (A234 WPB: C ≤0.30%, Mn 0.29–1.06%, Si ≥0.10%)
Size Range	1/2″ to 72″ (DN15–DN1800)
Wall Thickness	SCH 10, SCH 40, SCH 80, up to 200 mm
Manufacturing	Butt-Welded, Seamless, Welded Fabrication
Surface Treatment	FBE, 3LPE, Galvanizing
Testing	Chemical Analysis (C ≤0.30%, Mn 0.29–1.06%), Tensile (YS ≥240 MPa, TS ≥415 MPa), Hydrostatic (≥9.8 MPa), Radiographic, Ultrasonic, PMI
Operating Conditions	Pressure: ≥9.8 MPa, Temperature: Up to 450°C
Certifications	EN 10204/3.1, ISO 9001, ASME U-Stamp, Third-Party Inspection

Comparison of A234 WPB Pipe Caps with Other Fittings
Feature	A234 WPB Pipe Cap	ASME B16.9 Stainless Steel Cap	Fond Bombé (Dished Head)
Material	Carbon Steel (A234 WPB)	Stainless Steel (304, 316L, 1.4541, 1.4571)	Carbon Steel (HII, P265GH), Stainless Steel (304, 316L), Alloy Steel (15Mo3, 13CrMo44)
Standard	ASME/ANSI B16.9, ASTM A234	ASME/ANSI B16.9, ASTM A403	DIN 28011, DIN 28013, ASME UG-32, EN 13445
Function	Seals large-diameter pipe ends, protects against corrosion	Seals pipe ends, protects against corrosion	Seals pressure vessels, versatile designs
Corrosion Resistance	Good (with coatings like FBE, 3LPE)	Excellent (inherent stainless steel properties)	Excellent (stainless steel), Good (carbon steel with coatings)
Erosion Resistance	Good (static application)	Good (static application)	Excellent (hemispherical), Good (elliptical, torispherical)
Applications	Pipelines, boilers, petrochemical	Pipelines, boilers, petrochemical	Pressure vessels, boilers, petrochemical
Temperature Range	Up to 450°C	Up to 870°C	Up to 450°C (carbon steel), 870°C (stainless steel)
Cost	Moderate	Higher	Varies (hemispherical: high; torispherical: low)
Key Advantage	Cost-effective for large-diameter pipes	Superior corrosion resistance	Versatile designs for vessels

Key Benefits

Corrosion Resistance

Enhanced with FBE, 3LPE, or galvanizing for harsh environments.

High-Pressure Sealing

Butt-welded design for pressures ≥9.8 MPa.

Large-Diameter Compatibility

Available up to 72″ for large pipelines.

Temperature Performance

Suitable for temperatures up to 450°C.

Weldability

Seamless integration with piping systems.

Cost-Effective

Economical carbon steel for large-diameter applications.

Search A234 WPB Large-Diameter Pipe Caps by These Terms

A curated list of long-tail keywords for A234 WPB large-diameter pipe caps, covering standards, materials, and industrial applications.

Standards and Specifications

• A234 WPB pipe cap specifications
• ASME B16.9 A234 WPB pipe cap standards
• Large-diameter pipe cap dimensions
• A234 WPB pipe cap tolerances

Material and Type

• Carbon steel A234 WPB pipe cap
• Butt-welded A234 WPB pipe cap
• Seamless A234 WPB pipe cap
• Welded large-diameter pipe cap

Industrial Applications

• A234 WPB pipe cap for boiler pipeline protection
• Large-diameter pipe cap for pipelines
• A234 WPB pipe cap for refinery systems
• High-pressure A234 WPB pipe cap for boilers

Petrochemical Applications

• A234 WPB pipe cap for oil and gas
• Large-diameter pipe cap for petrochemical systems
• Corrosion-resistant A234 WPB pipe cap
• A234 WPB pipe cap for gas processing

Chemical Processing

• A234 WPB pipe cap for chemical plants
• Large-diameter pipe cap for corrosive fluids
• High-pressure A234 WPB pipe cap for reactors
• A234 WPB pipe cap for chemical processing

Specialty Applications

• A234 WPB pipe cap for offshore platforms
• Large-diameter pipe cap for power generation
• A234 WPB pipe cap for water treatment
• Pipe cap for pulp and paper industry

Note: A234 WPB large-diameter pipe caps are designed for corrosion-resistant, high-pressure sealing in pipelines and industrial systems. Contact a certified supplier for detailed specifications.

A234 WPB large-diameter pipe caps are used to seal pipe ends, providing corrosion resistance and protection for pipelines in boiler pipeline protection, petrochemical, power generation, and chemical processing systems.

A234 WPB pipe caps (carbon steel) are cost-effective with good corrosion resistance when coated (FBE, 3LPE), while stainless steel caps (304, 316L) offer superior inherent corrosion resistance and higher temperature tolerance (up to 870°C).

A234 WPB pipe caps are made from carbon steel (C ≤0.30%, Mn 0.29–1.06%, Si ≥0.10%), with coatings like FBE, 3LPE, or galvanizing for corrosion resistance.

A234 WPB pipe caps are produced via: - Butt-Welded Fabrication: For secure sealing.
- Seamless Process: For smaller sizes.
- Welded Fabrication: For large diameters.
These ensure corrosion resistance and structural integrity.

Key benefits include: - Corrosion Resistance: Enhanced with coatings.
- High-Pressure Sealing: Butt-welded for ≥9.8 MPa.
- Large-Diameter Compatibility: Up to 72″.
- Cost-Effective: Economical carbon steel.

A234 WPB pipe caps range from 1/2″ to 72″ (DN15–DN1800), with wall thicknesses up to 200 mm (SCH 10, SCH 40, SCH 80), suitable for large-diameter pipeline applications.

Quality is ensured through: - Chemical Analysis: Verifies composition (C ≤0.30%, Mn 0.29–1.06%).
- Tensile Testing: Confirms strength (YS ≥240 MPa, TS ≥415 MPa).
- Hydrostatic Testing: Verifies pressure integrity (≥9.8 MPa).
- Nondestructive Testing: Radiographic, ultrasonic, PMI.
These ensure corrosion resistance and durability.

Weight is calculated using: Weight (kg) = [π * (D²/4) * t * ρ * SF / 1000], where D is the diameter, t is wall thickness, ρ is density (~7.85 g/cm³ for A234 WPB), and SF is the shape factor (~0.8 for pipe caps).

Applications include: - Power Generation: Boiler pipeline protection.
- Petrochemical: Oil and gas pipeline sealing.
- Chemical Processing: Corrosive fluid pipelines.
- Offshore Platforms: Seawater-resistant pipelines.
These benefit from corrosion resistance.

Welding requirements include: - Preheating: 100-150°C for walls >10mm.
- Filler Materials: AWS A5.1 E7018 for carbon steel.
- Post-Weld Heat Treatment: Stress relief at 600-650°C.
These ensure welds for boiler pipeline protection.

Types of End Caps

By Connection Method

Butt Weld End Caps

Standards: ASME B16.9 and ASME B16.25

Description: Designed for butt welding to pipe end, providing permanent and strong connection.

Excellent strength
High pressure/temperature suitable
Permanent leak-proof seal

Socket Weld End Caps

Standards: ASME B16.11

Description: Fit into socket of pipe fitting and welded in place.

Easier installation
Small diameter pipes (NPS 2 and below)
Cost-effective solution

Threaded End Caps

Thread Types: NPT and BSP configurations

Description: Feature internal or external threads for screwing onto threaded pipe ends.

Easy installation and removal
No welding required
Reusable design

By Shape Configuration

Round Caps

Features: Flange, slotted head, knurled or faceted head options

Flange design for easy removal
Slotted head for screwdriver use
Tear tab for quick removal

Square/Rectangular Caps

Considerations: Length and width dimensions are critical

Square: Equal length and width
Rectangular: Width is smaller dimension
Custom configurations available

Hemispherical Caps

Design: Dome-shaped for optimal pressure distribution

Superior strength under pressure
Smooth flow characteristics
High-pressure applications

What is the ASTM A234?

ASTM A234 specification details for chemical composition, tensile properties, and fitting designations for wrought carbon and alloy steel piping fittings.

The chemical composition of wrought carbon and alloy steel fittings under ASTM A234 must conform to the requirements listed in Table 1. All values are maximum unless otherwise indicated, and an ellipsis (...) indicates no requirement. The table includes grades such as WPB, WPC, WP1, WP11, WP12, WP22, WP5, WP9, WPR, WP91, and WP911, each with specific compositional limits for elements like carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, nickel, copper, and others like vanadium, columbium, nitrogen, aluminum, titanium, zirconium, boron, and tungsten.

Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc. ASTM A403 Standard specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications.

Chemical Requirements

Grade and Marking Symbol	Carbon	Manganese	Phosphorus, max	Sulfur, max	Silicon	Chromium	Molybdenum	Nickel	Copper	Others
WPB^B,C,D,E,F	0.30 max	0.29–1.06	0.050	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	Vanadium 0.08 max
WPC^C,D,E,F	0.35 max	0.29–1.06	0.050	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	Vanadium 0.08 max
WP1	0.28 max	0.30–0.90	0.045	0.045	0.10–0.50	...	0.44–0.65	...	...	...
WP12 CL1, CL2	0.05–0.20	0.30–0.80	0.045	0.045	0.60 max	0.80–1.25	0.44–0.65	...	...	...
WP11 CL1	0.05–0.15	0.30–0.60	0.030	0.030	0.50–1.00	1.00–1.50	0.44–0.65	...	...	...
WP11 CL2, CL3	0.05–0.20	0.30–0.80	0.040	0.040	0.50–1.00	1.00–1.50	0.44–0.65	...	...	...
WP22 CL1, CL3	0.05–0.15	0.30–0.60	0.040	0.040	0.50 max	1.90–2.60	0.87–1.13	...	...	...
WP5 CL1, CL3	0.15 max	0.30–0.60	0.040	0.030	0.50 max	4.0–6.0	0.44–0.65	...	...	...
WP9 CL1, CL3	0.15 max	0.30–0.60	0.030	0.030	1.00 max	8.0–10.0	0.90–1.10	...	...	...
WPR	0.20 max	0.40–1.06	0.045	0.050	...	...	1.60–2.24	0.75–1.25	...	...
WP91	0.08–0.12	0.30–0.60	0.020	0.010	0.20–0.50	8.0–9.5	0.85–1.05	0.40 max	...	Vanadium 0.18–0.25, Columbium 0.06–0.10, Nitrogen 0.03–0.07, Aluminum 0.02 max, Titanium 0.01 max, Zirconium 0.01 max
WP911	0.09–0.13	0.30–0.60	0.020	0.010	0.10–0.50	8.5–9.5	0.90–1.10	0.40 max	...	Vanadium 0.18–0.25, Columbium 0.060–0.10, Nitrogen 0.04–0.09, Aluminum 0.02 max, Boron 0.0003–0.006, Tungsten 0.90–1.10, Titanium 0.01 max, Zirconium 0.01 max

Notes:
A: Welded construction fittings are supplemented with “W”.
B: Fittings from bar/plate may have 0.35 max carbon.
C: Fittings from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
D: For each 0.01% reduction below carbon max, manganese may increase by 0.06% up to 1.65%.
E: Sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00%.
F: Sum of Chromium and Molybdenum shall not exceed 0.32%.
G: Applies to both heat and product analyses.

Tensile Requirements

The tensile properties of ASTM A234 fittings must meet the requirements in Table 2, specifying minimum tensile and yield strengths, and elongation for various grades. Testing can be longitudinal or transverse, with only the appropriate elongation requirement applying.

Grade and Marking Symbol	Tensile Strength, min ksi [MPa]	Yield Strength, min ksi [MPa]
WPB	60 [415]	35 [240]
WPC, WP11 CL2, WP12 CL2	70 [485]	40 [275]
WP1	55–80 [380–550]	30 [205]
WP11 CL1, WP22 CL1, WP5 CL1, WP9 CL1	60 [415]	30 [205]
WPR	63–88 [435–605]	46 [315]
WP11 CL3, WP22 CL3, WP5 CL3, WP9 CL3	75 [520]	45 [310]
WP91	90 [620]	60 [415]
WP911	90–120 [620–840]	64 [440]
WP12 CL1	60 [415]	32 [220]

Elongation Requirements

Grades	All Grades except WPR, WP91, WP911		WPR		WP91, WP911
	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse
Standard round specimen, min % in 4D	22	14	20	...	20	13
Rectangular specimen, wall thickness ≥ 5/16 in. [7.94 mm], min % in 2 in. [50 mm]	30	20^A	28	...	...	...
Rectangular specimen, wall thickness < 5/16 in. [7.94 mm], min % in 2 in. [50 mm]	^B	^B	^B	...	...	...

Notes:
A: WPB and WPC fittings from plate shall have a minimum elongation of 17%.
B: For each 1/32 in. [0.79 mm] decrease in wall thickness below 5/16 in. [7.94 mm], deduct 1.5% (longitudinal) and 1.0% (transverse).

Wall Thickness, in. [mm]	All Grades except WPR, WP91, WP911		WPR	WP91, WP911
	Longitudinal	Transverse	Longitudinal	Longitudinal
5/16 (0.312) [7.94]	30.0	20.0	28.0	20
9/32 (0.281) [7.14]	28.5	19.0	26.5	19
1/4 (0.250) [6.35]	27.0	18.0	25.0	18
7/32 (0.219) [5.56]	25.5	...	23.5	17
3/16 (0.188) [4.76]	24.0	...	22.0	16
5/32 (0.156) [3.97]	22.5	...	20.5	15
1/8 (0.125) [3.17]	21.0	...	19.0	14
3/32 (0.094) [2.38]	19.5	...	17.5	13
1/16 (0.062) [1.59]	18.0	...	16.0	12

Elongation equations: Longitudinal: E = 48t + 15.00; Transverse: E = 32t + 10.00, where E = elongation in 2 in. or [50 mm], %, and t = thickness, in. [mm].

Fitting Designation for Marking Purposes

Fittings are marked per MSS-SP-25, indicating manufacturer, size, schedule/pressure class, fitting designation, and heat number. Welded fittings include a “W” suffix, and ultrasonic-inspected welds add a “U”.

Grade	Class	Construction	Mandatory Marking
WPB	-	Welded	WPBW^A
WPB	-	Seamless	WPB
WPC	-	Welded	WPCW^A
WPC	-	Seamless	WPC
WP1	-	Welded	WP1W^A
WP1	-	Seamless	WP1
WP12	CL1	Welded	WP12 CL1W^A
WP12	CL1	Seamless	WP12 CL1
WP12	CL2	Welded	WP12 CL2W^A
WP12	CL2	Seamless	WP12 CL2
WP11	CL1	Welded	WP11 CL1W^A
WP11	CL1	Seamless	WP11 CL1
WP11	CL2	Welded	WP11 CL2W^A
WP11	CL2	Seamless	WP11 CL2
WP11	CL3	Welded	WP11 CL3W^A
WP11	CL3	Seamless	WP11 CL3
WP22	CL1	Welded	WP22 CL1W^A
WP22	CL1	Seamless	WP22 CL1
WP22	CL3	Welded	WP22 CL3W^A
WP22	CL3	Seamless	WP22 CL3
WP5	CL1	Welded	WP5 CL1W^A
WP5	CL1	Seamless	WP5 CL1
WP5	CL3	Welded	WP5 CL3W^A
WP5	CL3	Seamless	WP5 CL3
WP9	CL1	Welded	WP9 CL1W^A
WP9	CL1	Seamless	WP9 CL1
WP9	CL3	Welded	WP9 CL3W^A
WP9	CL3	Seamless	WP9 CL3
WPR	-	Welded	WPRW^A
WPR	-	Seamless	WPR
WP91	-	Welded	WP91W^A
WP91	-	Seamless	WP91

Note: A: Add “U” to marking if welds are ultrasonic inspected in lieu of radiography.

A234 WPB Large-Diameter Pipe Cap

A234 WPB Large-Diameter Pipe Cap

A234 WPB Large-Diameter Pipe Caps for Pipeline and Boiler Protection

Key Benefits

Corrosion Resistance

High-Pressure Sealing

Large-Diameter Compatibility

Temperature Performance

Weldability

Cost-Effective

Search A234 WPB Large-Diameter Pipe Caps by These Terms

Standards and Specifications

Material and Type

Industrial Applications

Petrochemical Applications

Chemical Processing

Specialty Applications

What are A234 WPB large-diameter pipe caps used for?

How do A234 WPB pipe caps differ from stainless steel caps?

What material is used in A234 WPB pipe caps?

How are A234 WPB large-diameter pipe caps manufactured?

What are the key benefits of A234 WPB pipe caps?

What size range is available for A234 WPB pipe caps?

How is the quality of A234 WPB pipe caps ensured?

How is the weight of an A234 WPB pipe cap calculated?

What are typical applications for A234 WPB pipe caps?

What are the welding requirements for A234 WPB pipe caps?

Types of End Caps

By Connection Method

Butt Weld End Caps

Socket Weld End Caps

Threaded End Caps

By Shape Configuration

Round Caps

Square/Rectangular Caps

Hemispherical Caps

What is the ASTM A234?

Chemical Requirements

Tensile Requirements

Elongation Requirements

Fitting Designation for Marking Purposes

A234 WPB Large-Diameter Pipe Cap Applications

Oil & Gas

Chemical Processing

Power Generation

Construction

Marine & Shipbuilding

Food & Pharmaceutical

Related products

Elliptical Heads

Torispherical Heads

Fond Bombé

Large-Size Pipe Caps

Pipe caps DIN 2617

ASME/ANSI B16.9 Pipe End Cap