ASTM A420 WPL6 Pipe End Caps | ASME B16.9 Butt Weld Caps
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ASTM A420 WPL6 pipe end caps are low-temperature carbon steel butt weld fittings manufactured according to ASME B16.9 dimensional standards. These fittings are designed to close the end of piping systems and are commonly used in low temperature service environments such as LNG plants, oil and gas pipelines, and cryogenic processing systems.
A420 WPL6 end caps are produced from wrought carbon steel materials with controlled chemical composition and mechanical properties to ensure adequate strength and toughness at sub-zero temperatures. The material specification ASTM A420 WPL6 requires Charpy V-notch impact testing, making it suitable for piping systems operating at temperatures down to approximately −46°C (−50°F).
ASME B16.9 pipe caps are typically manufactured by hot forming or cold forming processes using seamless or welded pipe as the raw material. After forming, the fittings undergo heat treatment and inspection to meet the requirements of ASTM A420 and ASME dimensional standards
ASTM A420 WL6 caps is matching with A333 Gr 6 Pipe,and A350 LF2 Flanges,and A350 LF2 forged fittings in the pipeline connection.
ASTM A420/A420M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service. ASTM A420 WPL6 Grade is associated with ASTM A420 for pipe fittings manufactured of Wrought Carbon Steel. WPL6 is a normalized grade of carbon steel that has been Charpy Impact tested at -50 degree F for use in low temperature service.
Astm A420 specification
Material and Manufacture:
The raw material for A420 WPL6 fittings shall be fully killed steel,
A420 WPL6 Pipe fittings Heat Treatment
All A420 WPL6 fittings shall be furnished in the normalized, normalized and tempered, annealed, or quenched and tempered condition
A420 WPL6 Pipe fittings Inspection
Pipe fittings manufactured to ASTM A420 shall take the following tests or inspections: dimensional inspection, visual examination, hydrostatic test(when required), chemical analysis, tensile test, impact test, radiographic test(RT).
ASTM A420 WPL6 Pipe Cap Specification
| Item | Specification |
|---|---|
| Product | Butt Weld Pipe End Cap |
| Material | ASTM A420 WPL6 |
| Standard | ASME B16.9 |
| Type | Seamless / Welded |
| Size Range | NPS 1/2″ – 48″ |
| Wall Thickness | SCH 10 – SCH XXS |
| Temperature Service | Low Temperature |
ASTM A420 WPL6 CAPS Chemical Composition
| C | Mn | P | S | Si | Ni | Cr | Mo | Cu | Cb | V |
|---|---|---|---|---|---|---|---|---|---|---|
| ≤0.30 | 0.50~1.05 | ≤0.035 | ≤0.040 | 0.15~0.40 | ≤0.40 | ≤0.30 | ≤0.12 | ≤0.40 | ≤0.02 | ≤0.08 |
*All values are in % unit.
ASTM A420 WPL6 mechanical property
| Tensile Strength, min. | Yield Strength, min. | Elongation (2 in.), min. | |||
|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | Longitudinal, % | Transverse, % |
| 60~95 | 415~655 | 35 | 240 | 30 | 16.5 |
*All properties shall be measured at room temperature.
ASTM A420 WPL6 Charpy Impact Requirements
| Size of Specimen | A* | B* | ||
|---|---|---|---|---|
| mm | ft·lbf | J | ft·lbf | J |
| 10 by 10.0 | 13 | 17.6 | 10 | 13.6 |
| 10 by 7.5 | 10 | 13.6 | 8 | 10.8 |
| 10 by 5.0 | 7 | 9.5 | 5 | 7.0 |
| 10 by 2.5 | 4 | 5.4 | 3 | 4.1 |
*A – Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens).
*B – Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set).
*The impact test temperature shall be -50°F[-45°C] for ASTM A420 Gr. WPL6.
Typical Applications
ASTM A420 WPL6 pipe end caps are widely used in industrial piping systems including:
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LNG processing plants
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Cryogenic pipelines
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Oil and gas transportation systems
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Petrochemical plants
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Offshore platforms
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Low temperature pressure vessels
These fittings are often used together with ASTM A420 WPL6 elbows, tees, reducers, ASTM A333 Gr.6 pipes, and ASTM A350 LF2 flanges in low temperature pipeline assemblies.
How to order our ASTM A420 WPL6 CAPS?
Example#1,
LTCS ASTM A420 WPL6 CAPS, SCH STD, 24 Inch, BW Ends, B16.9
Related Butt Weld Fittings
Other fittings manufactured according to ASTM A420 WPL6 and ASME B16.9 include:
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ASTM A420 WPL6 Butt Weld Tees
-
ASTM A420 WPL6 Eccentric Reducers
