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YANHAO
YANHAO
Flanges · Pipes · Fittings

Pipe Cap

Our company provides All Kinds of Pipe Cap

We provide Pipe Cap products of various standards, such as American standards, European standards, German standards, and Japanese standards. The list of common standards is as follows:

  • ASME/ANSI B16.9、ASME/ANSI B16.11、ASME/ANSI B16.28;
  • JIS B2311, JIS B2312, JIS B2313, JIS B2316
  • ISO 15590
  • EN 10253
  • MSS SP-43, MSS SP-79/83/95
  • API 5L
  • BS 3799
  • Customized Pipe Tee
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cap

Industrial Pipe cap

Made in China Pipe cap, lower price, better quality!

Cap could be ranged from connection types, shape types, material types.

  • by connection types
  • by shape types
  • by Material

Classified by Connection Types

As per the connection mode, Pipe Cap could be classified by Butt Weld, Socket Weld and Threaded.

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Butt Weld Pipe Cap

Description

Permanent connection via full-penetration groove welding between beveled-end pipe and cap (typically with 37.5° bevel per ANSI B16.25). The cap is usually elliptical or hemispherical in shape.

Features

  • Homogeneous metallurgical bond with weld strength ≥95% of base metal
  • Zero internal crevices, preventing microbial growth or corrosion
  • Suitable for radiographic testing (RT), ultrasonic testing (UT), and hydrostatic testing
  • Excellent durability under high-temperature and high-pressure conditions

Applications

High-pressure steam lines (ASME B31.1) | Oil & gas pipelines (ASME B31.3 / B31.4) | Power generation systems | Pressure vessels | Chemical reactors

BW Pipe Cap Dimensions and Weight (ASME B16.9)

NPS (in)OD at Bevel (mm)Sch40 WT (mm)Sch80 WT (mm)Sch160 WT (mm)XXS WT (mm)Length E (mm)Weight Sch40 (kg)Weight Sch80 (kg)
1/2″21.32.773.73—4.55250.090.12
3/4″26.72.873.91—4.83250.110.15
1″33.43.384.55—5.56380.180.26
1-1/2″48.33.685.087.147.62380.350.48
2″60.33.915.548.718.71380.570.75
3″88.95.497.6211.1311.13511.532.12
4″114.36.028.5613.4913.49642.573.65
6″168.37.1110.9718.2618.26896.169.40
8″219.18.1812.7023.0123.0110210.8516.60
10″273.09.2715.0928.5828.5812717.4027.80
12″323.99.5317.4833.3233.3215225.2044.50
14″355.69.5319.0536.53—16531.6059.50
16″406.49.5321.4440.49—17842.5078.90
18″457.29.5323.8344.45—20353.9099.70
20″508.09.5326.1948.26—22966.50122.50
24″609.69.5330.1856.21—26796.70174.90
28″711.29.5332.13——305135.00238.00
30″762.09.5332.54——330154.00271.00
32″812.89.5333.32——356176.00311.00
36″914.49.5334.29——406228.00403.00
40″1016.09.5336.53——457288.00505.00
42″1066.89.5337.59——483317.00560.00
48″1219.29.5340.49——533408.00728.00
  • 管帽

Socket Weld Pipe Cap

Description

Semi-permanent connection achieved by inserting the pipe into the socket of the cap and performing a fillet weld around the outer circumference. Best suited for small-diameter, high-pressure applications.

Features

  • Strong and compact structure suitable for vibration-resistant systems
  • Minimal alignment requirement simplifies installation
  • Allows full bore flow without reducing pipe diameter
  • Welding outside the flow path reduces internal crevice formation

Applications

High-pressure hydraulic systems | Small-bore chemical process lines | Steam distribution systems | Instrumentation lines | Fire protection piping

SW Pipe Cap Dimensions and Weight (ASME B16.9)

Standard: ASME B16.11 – Socket Weld Cap (Class 3000 / 6000 / 9000)

NPS (in)Outside Diameter D (mm)Socket Bore B (mm)Socket Depth J (mm)Cap Length L (mm)Wall Thickness C (mm)
1/8″1610.510.2223.5
1/4″1913.010.4253.9
3/8″2217.410.7254.3
1/2″2821.712.7284.9
3/4″3527.113.0325.5
1″4434.013.6386.4
1-1/4″5742.814.5446.9
1-1/2″6448.615.0517.6
2″7661.216.3608.1
2-1/2″9273.918.0709.0
3″10889.119.27910.2
4″140115.721.69511.7
  • 螺纹管帽

Threaded Elbows

Description

Non-welded closure that screws onto the externally threaded pipe end using tapered threads (NPT or BSPT), providing a mechanical seal often aided by thread sealant or tape.

Features

  • Quick installation and removal without special tools
  • Ideal for low-pressure or non-permanent closures
  • Reusable in temporary or testing systems
  • No heat input or welding required—reducing fire hazard during installation

Applications

Low-pressure air or water piping | Instrumentation lines | Plumbing & HVAC systems | Pipe pressure testing and capping | Temporary service lines

TH Pipe Cap Dimensions and Weight (ASME B16.9)

Standard: ASME B16.11 – Threaded Cap (Class 3000 / 6000 / 9000)

NPS (in)Outside Diameter D (mm)Thread Bore B (NPT)Thread Length (mm)Cap Length L (mm)Wall Thickness C (mm)
1/8″16NPT 1/86.4223.5
1/4″19NPT 1/46.4253.9
3/8″22NPT 3/88.1254.3
1/2″28NPT 1/29.1284.9
3/4″35NPT 3/410.9325.5
1″44NPT 113.6386.4
1-1/4″57NPT 1-1/417.3446.9
1-1/2″64NPT 1-1/218.0517.6
2″76NPT 219.0608.1
2-1/2″92NPT 2-1/222.4709.0
3″108NPT 325.97910.2
4″140NPT 431.59511.7

Classified by Shape types

Pipe caps can be categorized by shape into three main types: hemispherical caps, elliptical caps, and flat/dished caps. Hemispherical caps offer the highest pressure-bearing capacity due to their deepest curve and most uniform load distribution. Elliptical caps are the most common standard caps in piping systems, though weaker than hemispherical caps but cheaper. Flat/dished caps, however, are suitable for low-pressure or temporary containment scenarios due to their ease of manufacture and lowest cost.

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Hemispherical Cap

The depth of the hemispherical head’s curve is equal to the pipe radius. This evenly distributes stress, achieving the highest design pressure rating for a given wall thickness. Applicable standards include ASME VIII Division 1 and EN 13445.

Hemispherical heads are manufactured using a pot-forging or hot spinning process. The hot-formed head surface is typically sandblasted or shot-blasted to enhance the adhesion of the anti-corrosion coating. Available materials include ASTM A105 carbon steel, ASTM A182 F304/316 stainless steel, or high-temperature alloys.

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Elliptical Cap

The ellipsoidal head has a major-to-minor axis ratio of approximately 2:1, and its depth is approximately one-quarter the pipe diameter. Its pressure-carrying capacity is 80–90% that of a hemispherical head, while material consumption is reduced by 25–30%. The dimensions and tolerances of this type of head strictly adhere to ASME B16.9 (butt-weld fittings) and EN 10253-2 (welded fittings).

The production process typically involves step-by-step deep drawing or hydrostatic forming, followed by annealing. After stamping, welding procedures are certified to ASME Section IX and tested for compatibility with NACE MR0175.

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Flat/Dished Cap

Flat-bottom or concave heads offer a simple planar structure and low manufacturing cost, but their pressure resistance is only 20–40% of that of ellipsoidal heads. Their dimensions are often designed based on EN 1092-1 (slip-on flanges) or ASME B16.5 (pipe flanges and flange accessories).

After shearing or laser cutting, these plates are cold-bent or stamped, and can be electrophoretically coated or epoxy-painted for enhanced corrosion resistance. Because their pressure ratings are typically limited to PN 10–PN 16 or Class 150, they are often used for quick-sealing solutions in building plumbing, HVAC terminals, pipe purging, and temporary sealing.

Classified by Material Types

According to the valve body material, it has stainless steel, carbon steel and alloy steel elbow.

Stainless Steel pipe cap

Material Characteristics: Iron-based alloys with ≥10.5% chromium, forming a self-repairing passive oxide layer. Subtypes vary by crystal structure (austenitic, ferritic, etc.) and alloying elements (Ni, Mo, N) for enhanced corrosion/heat resistance.

SubtypeStandard & GradeKey AdvantagesApplication Directions
Austenitic (304)ASTM A403 WP304Universal corrosion resistanceFood processing, architecture, chemicals
Austenitic (316)ASTM A403 WP316Superior chloride resistanceMarine, pharmaceutical, coastal plants
Duplex (2205)ASTM A815 UNS S31803High strength, stress corrosion resOffshore, chemical processing
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Carbon Steel pipe cap

Material Characteristics: Primarily composed of iron-carbon alloys (C ≤ 2.1%), with trace elements like Mn, Si. Exhibits good mechanical strength and ductility but limited corrosion resistance. Properties vary by carbon content and heat treatment.

SubtypeStandard & GradeKey AdvantagesApplication Directions
Low-Carbon SteelASTM A234 WPB, WPCCost-effective, high weldabilityWater, oil, gas pipelines (low/medium pressure)
Forged CarbonASTM A105Uniform structure, high strengthFlanged systems, valves, fittings
Low-Temp CarbonASTM A350 LF2Impact resistance (-46°C)Cryogenic storage, LNG systems
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Alloy Steel pipe cap

Material Characteristics: Carbon steel enhanced with elements like Cr, Mo, Ni, V (total alloying ≤10%). Combines high strength, toughness, and temperature resistance through microstructure control (e.g., tempered martensite).

SubtypeStandard & GradeKey AdvantagesApplication Directions
Inconel® (625)ASTM SB564 UNS N06625Extreme oxidation resistanceAerospace, gas turbines, nuclear reactors
Monel® (400)ASTM SB366 UNS N04400Resistance to acids & seawaterMarine engineering, sulfuric acid systems
Hastelloy® (C276)ASTM SB366 UNS N10276Pitting/chloride corrosion resPollution control, chemical reactors
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Material Selection Guide

Environment/ServiceStainless Steel (ASTM A403 WP304/316)Carbon Steel (ASTM A234 WPB)Alloy Steel (ASTM A182 F11/F22)
Corrosive (marine, chemical)Excellent – Austenitic SS (e.g. 304/316) forms a protective Cr-oxide layer, giving outstanding corrosion resistance; typical fittings: ASTM A403 WP304/316. Weldable (be careful of chloride pitting in 304, use 316 for chlorides).Poor – Prone to rust and pitting in wet/chemical environments; requires coatings or cathodic protection. Typical: A234 WPB (coated/painted steel caps).Good – Chrome-Moly steels (e.g. A182 F11/F22) contain Cr/Mo for improved corrosion resistance. Better than plain carbon but less inert than stainless.
High TemperatureGood – Austenitic SS retains strength and ductility at elevated T (suitable up to ~800°C for 304/316L; 321/310S available for higher T). Good oxidation resistance in air.Fair – Ordinary carbon steel softens above ~400–500°C; strength drops and scaling occurs. Used only for moderate heat. Typical: A234 WPB for 200–300°C service.Excellent – Cr-Mo alloy steels (e.g. A182 F11, F22 or A234 WP11/WP22) are designed for high-T/high-P. High creep/rupture strength; Cr/Mo additions greatly improve oxidation resistance.
Low TemperatureExcellent – Austenitic SS stays ductile even at cryogenic temps (tensile strength increases at sub-zero). Low-T grades: 304L/316L (ASTM A403 WPL6/WPL9).Poor – Standard carbon steel becomes brittle at low T, risking fracture. Special low-temp carbon (e.g. ASTM A350 LF2) must be used for cryogenic service.Fair – Ferritic Cr-Mo alloys generally lose toughness in extreme cold. Some low-temp alloy steels (e.g. ASTM A420 WPL3) exist, but often austenitic SS or low-temp carbon steels are preferred.
High PressureGood – Stainless (especially duplex or high-Ni alloys) has good pressure capacity; however, yield strength is typically lower than carbon steel. Common: 316L, duplex 2205 (ASTM A403/A182).Excellent – Very high strength; widely used in HP pipelines and reactors. Typical: A234 WPB caps (from A106 GrB/A105 material) or seamless A106 GrB pipe caps.Excellent – Alloy steels (F11/F22, WP11/WP22) have very high strength and toughness, ideal for very high pressures (e.g. boiler superheater caps, high-pressure steam).
General Industrial UseGood – Chosen when corrosion resistance or hygiene is needed. Common grades (304/316) weld readily (with precautions). Moderate cost.Excellent – Default choice for general piping (cost-effective, readily available). Excellent weldability in low-carbon grades. Very versatile.Good – Used when extra strength, toughness or temperature rating is needed. Many grades available (e.g. F5/F9/F91 for HP steam), but higher cost means not used unless required.
Underground/BuriedGood – Excellent resistance to soil and groundwater corrosion. 304L/316L (A403 WPL6/WPL9) often used for buried lines.Poor – Susceptible to soil moisture corrosion. Requires heavy protective coatings or cathodic protection in pipelines.Fair – More resistant than plain carbon (Cr/Mo offers some protection), but not as inert as stainless. Usually requires coating/cathodic measures in buried service.
Cost-Sensitive ProjectsPoor – Highest material and fabrication cost (especially nickel-containing grades).Excellent – Lowest cost and very common. Simplest fabrication and welding.Poor – Expensive alloy content and heat treatment. Used only when performance merits the cost.

Customized Pipe Cap Process

The following options are for you to customize. If you don’t have a design drawing, you can also consult our engineers and let us help you draw it.

size

Specified pipeline size, including pipe elbow direction angle, thickness, bolt hole diameter, bolt hole distance, etc.

Material

Using specified material suitable for pipeline engineering according to your requirements.

Shape

can be customized with pipe elbow such as Reducing Elbow.

Connection

Butt Weld Elbows, Socket Weld Elbows, Threaded Elbows, etc., which can be selected.

Special Treatment

Special treatments such as surface coatings and anti-corrosion can be made according to your needs.

The customization process for Pipe Cap is generally as follows:

1

requirements
Confirmation

Communicate in detail to determine the requirements for pipe elbow size, material, pressure, connection method, etc.

2

Raw Material Preparation

Cut pipe to dimensions on process card using CNC cutting machines (±1mm tolerance). Remove burrs, scale, and debris from cut ends. Grind pipe ends smooth.

3

Billet Pre-Treatment

Spray internal coating lead powder graphite binder solution 0.2-0.3mm thickness dry in 120C oven for two hours

4

Hot Push Bending

Install mandrel die heat tube via medium-frequency induction to 750±10C hydraulic push at 50-80mms with 300-500t force

5

Post Forming Processing

Cool via air mist mixture control 50-80Cmin rate lathe machine ends ensure wall uniformity bevel 375±25deg

6

Quality Inspection

Check surface defects verify dimensions with calibrated gauges perform 100 percent MT and UT nondestructive testing

7

Surface Treatment

Shot blast using cast steel shot achieve SA25 cleanliness apply epoxy primer and polyurethane topcoat at specified thickness

8

Packaging Storage

Protect ends with plastic caps separate elbows with foam spacers include certificates store in dry ventilated warehouse

Customize it Now
Free Consulting

Image Gallery

Here are various Pipe Cap produced by YANHAO. You can click on the pictures to enlarge them. As a company with 25 years of Pipe Cap production experience, YANHAO supports all types of Pipe Cap production.

Pipe Cap Image Gallery

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  • FAQs About Pipe Cap

    A pipe cap is a pipe fitting used to seal the end of a pipe. It is typically connected to the pipe end through threads or welding (socket welding, butt welding), thereby sealing the pipe opening.

    Its main uses include:

    1. Sealing and Leak Prevention: Prevents leakage of fluids (liquids, gases, etc.) within the pipe, ensuring the tightness of the piping system. Suitable for pipe ends or unused branch ends;
    2. Protecting the pipe opening: Prevents foreign matter (such as dust, debris, and moisture) from entering the pipe during transportation, storage, or downtime, while also protecting the pipe opening from damage and deformation due to collisions and friction;
    3. Temporary or Permanent Sealing: It can be used as a temporary sealing member for a pipe system (such as during maintenance) or for pipe ends that require long-term sealing. Different connection methods are selected based on the operating conditions (e.g., threads for temporary use, welding for permanent use).

    Pipe cap types are divided by connection method: threaded pipe cap, butt weld pipe cap, socket weld pipe cap; by shape: dish-shaped, elliptical, flat cover, hemispherical, conical, etc.; by usage scenario: permanent sealing pipe cap and temporary protective cap, which need to match the pipeline connection method and working conditions.

    The material matches the pipeline. The metal types include stainless steel, carbon steel, and alloy steel. The corresponding material is selected according to the medium (corrosion, temperature) and pressure of the pipeline.

    Use threaded caps when frequent disassembly and assembly is required (such as maintenance, temporary plugging), low pressure scenarios, or non-permanent sealing; welded caps are suitable for permanent sealing, high pressure, or infrequent disassembly.

    The size matches the nominal diameter (NPS/DN) of the pipe, and the outside diameter (OD) corresponds to the outside diameter of the pipe. The specifications include thread type (such as NPT, BSP) and pressure rating, and follow standards such as ASME and GB.

    Installation: Clean the threads, wrap them with raw tape or apply sealant, and tighten them manually until they fit. Avoid damaging the threads by overtightening. Disassembly: Tighten them with a wrench, loosen them by turning clockwise, and lubricate them if they are rusted.

    For general pressure levels, carbon steel is selected for normal temperature and no corrosion; for high temperature environments, high temperature resistant materials (such as stainless steel and alloys) are selected; for corrosive media, corrosion resistant materials (Hastelloy) are selected; for high pressure, high strength metal materials are required.

    The key differences between pipe caps and end caps lie in their application, structure, and function:
    Pipe caps are primarily used in piping systems to seal pipe ends (such as the ends of straight pipes and unused branches). They come in a variety of shapes (round, tapered, etc.) and sizes that match the pipe diameter. Connection methods are typically threaded, socket welded, or butt welded. They have lower pressure ratings and adhere to pipe fitting standards.
    End caps, on the other hand, are used in closed equipment such as pressure vessels and storage tanks. As end seals, they have more standardized shapes (oval, disc-shaped, hemispherical, etc.) and are larger in size. They must be butt-welded to the equipment housing, withstand high pressures, and adhere to pressure vessel standards (such as GB 150).
    In short, pipe caps are designed for pipes, while end caps are designed for pressure-bearing equipment.

    Select industrial pipe cap materials based on pipeline working conditions, focusing on three key factors:

    Medium characteristics:

    • Corrosive media (acids, alkalis, seawater, etc.) → stainless steel (304/316) or alloy steel;
    • Non-corrosive media (water, steam, etc.) → ordinary carbon steel.

    Pressure level:

    • High pressure (≥10MPa) → alloy steel (chrome-molybdenum steel) or thick-walled stainless steel;
    • Low pressure (≤1MPa) → ordinary carbon steel is acceptable.

    Temperature range:

    • High temperature (≥400℃) → high-temperature resistant alloy steel (12Cr1MoV) or stainless steel (321);
    • Low temperature (≤-20℃) → low-temperature steel (09MnNiD);
    • Room temperature → carbon steel.

    In addition, 304 stainless steel is preferred for clean environments such as food/pharmaceuticals; carbon steel or plastic is preferred when cost is sensitive and working conditions are simple.

    To determine pipe size and select the appropriate cap, follow these steps:

    Confirm the nominal size (NPS): The NPS marked on the pipe (e.g., NPS 1/2, NPS 4) is the basis. The cap’s NPS must match exactly (for example, NPS 2 pipe requires an NPS 2 cap).

    Check the outside diameter (OD): International standards specify fixed outside diameters for NPS (e.g., ASME B36.10, where the OD for NPS 2 is 60.3mm). The inside diameter of the weld cap must precisely match the pipe’s OD to ensure a proper weld fit (refer to ASME B16.9).

    Match the connection parameters:

    • For welded connections, the cap’s wall thickness must conform to the corresponding pressure rating (e.g., Schedule 40, Schedule 80, in accordance with ASME B16.9).
    • For threads, confirm the thread type (e.g., NPT) and size, matching the ASME B16.11 standard.
    • For socket welds, verify the socket diameter and depth according to the standard. Maintain uniform standards: pipe caps must follow the same international standards as the pipelines (such as ASME and ISO systems) to avoid dimensional deviations.

    International standards: ASME B16.9 (general purpose butt weld, NPS 1/2 to 48), ASME B16.11 (threaded/socket weld), ISO 1127 (stainless steel butt weld).
    German DIN 2615, Japanese JIS B2311, etc.

    Chinese standards: GB/T 12459 (general purpose butt weld, DN15 to 2000), GB/T 13401 (large sizes, DN2000 and above), HG/T 21634 (for chemical applications).

    In addition to ASME, commonly used international pipe dimension standards include:

    • ISO standards, such as ISO 3183 (Steel Pipe for the Petroleum and Natural Gas Industry), specify the outer diameter, wall thickness, and tolerances of steel pipes and are applicable to most industrial sectors worldwide.
    • EN standards (European standards), such as EN 10216 (Seamless Steel Pipe for Pressure) and EN 10217 (Welded Steel Pipe for Pressure), define dimension series for different steel pipe materials and are widely used in Europe and regions adopting EU standards.
    • API standards, such as API 5L (Line Pipe Specification), specify core dimensions such as outer diameter and wall thickness for oil and natural gas transmission pipelines and are commonly used in the international oil and gas industry.
    • DIN standards (Germany), such as DIN 2448 (Seamless Steel Pipe Dimensions), although partially superseded by EN, are still used in some regions and define the outer diameter and wall thickness ranges for steel pipes.
    • JIS standards (Japan), such as JIS G3452 (Carbon Steel Pipe), specify outer diameter, wall thickness, and other dimensional parameters for Japanese-standard pipes and are applicable to Japanese projects. These standards specify parameters such as outside diameter (OD), wall thickness (Schedule/Sch), and nominal size (NPS) to regulate pipe sizes to match pipe fittings such as pipe caps.

    The cost of pipe caps made of different materials varies significantly, primarily due to raw material price, smelting difficulty, and performance requirements. The cost multipliers generally follow the following scale (based on carbon steel of the same specification):

    • Carbon steel (e.g., A105): 1x (baseline). Highly cost-effective, suitable for general industrial fluids, and the most widely used.
    • 304 stainless steel: Approximately 2-3x. Resistant to general corrosion, but cost is affected by fluctuations in nickel prices.
    • 316 stainless steel: Approximately 3-5x. Contains molybdenum, resistant to salt spray and strong acid corrosion, and 30%-50% more expensive than 304.
    • Alloy steel (e.g., chromium-molybdenum steel): Approximately 4-8x. Resistant to high temperatures and high pressures (e.g., power plants and chemical plants), but expensive due to the high content of alloying elements (chromium and molybdenum).
    • Specialty alloys (Hastelloy, titanium, nickel-based alloys): Approximately 10-50x. Designed for extreme conditions (severe corrosion, high temperatures and high pressures), raw materials are scarce and difficult to process, resulting in extremely high costs. Note: Large sizes (e.g., NPS 24 and above) or special processes (seamless, polished) will magnify differences, and market supply and demand may also affect short-term prices.

    Yes, the choice of cap material directly impacts its corrosion resistance. The chemical composition of the material (especially alloying elements like chromium, nickel, and molybdenum) determines its ability to resist corrosion in media like acids, bases, and salt spray. Carbon steel has poor corrosion resistance, while stainless steel improves its corrosion resistance due to the chromium-containing passive film. Specialty materials like Hastelloy and titanium alloys can withstand extremely corrosive environments.

    Stainless steel (such as 316), duplex steel (such as 2205), Hastelloy alloy, titanium alloy, etc. have good corrosion resistance.

    About YANHAO

    Aerial view of YANHAO Factory
    Aerial view of YANHAO Factory

    YANHAO is a China Flange Manufacturer located in Hebei Province, China. It is one of the few professional Flange suppliers in China.

    We have many years of experience in flange production and have multiple flange production lines. We have sufficient stock of raw materials, rich inventory, fast delivery, and can ship within three days. At the same time, the price is affordable. You are welcome to consult and purchase!

    In addition, we can provide a variety of customized flanges and pipe fittings. Customers can give drawings or samples, and our company will produce them to fit your specific requirements.

    Learn more about YANHAO >>

    Our company was founded in 2000 and has more than 300+ employees, including 85+ middle and senior engineering and technical personnel. Our company has a number of production lines and covers an area of ​​150,000 square meters and a building area of ​​30,000 square meters.

    300+

    Number Of Workers

    85+

    Mid&Senior Engineers

    150,000

    Square Meters of Area

    25+

    Years of Experience

    • Panoramic View of The Factory
      Panoramic view of the factory
    • Elbow bending workshop
      Elbow bending workshop
    • raw material pipe storage
      raw material pipe storage
    • steel pipe storage workshop
      steel pipe storage workshop
    • Carbon steel seamless elbows pushed to the workshop
      seamless elbows pushed workshop
    • Carbon steel elbow shaping workshop
      Carbon steel elbow shaping workshop
    • Carbon steel elbow product storage workshop
      Carbon steel elbow product storage workshop
    • Finished flange waiting workshop
      Finished flange waiting workshop
    • Stainless steel pipe storage workshop
      Stainless steel pipe storage workshop
    • Stainless steel pipe fittings production workshop
      Stainless steel pipe fittings production workshop
    • Flange product storage workshop
      Flange product storage workshop
    • Butt welding pipe production process workshop
      Butt welding pipe fittings production process workshop
    • Elbow and flange product storage workshop
      Elbow and flange product storage workshop
    • Large diameter butt welding elbow bending workshop
      Large diameter butt welding elbow bending workshop
    • product waiting to be shipped packaging
      product waiting to be shipped packaging

    Our Production Line

    Our company has 8 pipe fitting production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot-pushing machines, hot-die presses for reducers, cold-extrusion hydraulic presses for tees, forging hammers, vertical lathes, drilling machines, and other process-forming and mechanical processing equipment.

    Among them, the Φ1020 mm large-diameter medium-frequency hydraulic pushing machine, Φ1420 mm large-diameter medium-frequency bending machine, and Φ2438 mm 4,000-ton large hot-die press have an annual production capacity of more than 80,000 tons.

    8

    Pipe Fitting Production Lines

    5

    Flange Production Lines

    80,000 tons

    Annual Production Capacity

    • Elbow Forming Pushing Machine
      Elbow Forming Pushing Machine
    • Automatic Welding Machines
      Automatic Welding Machines
    • Hydraulic Butt Fusion Welding Machine
      Hydraulic Butt Welding Machine
    • Pipe Bending Machine
      Pipe Bending Machine
    • Cold Extrusion Tee Making Machine
      Cold Extrusion Tee Making Machine
    • Flange Lathe Machines
      Flange Lathe Machines
    • Heat treatment furnace
      Heat treatment furnace
    • Pipe Cleaning Shot Blasting Machine
      Pipe Cleaning Shot Blasting Machine
    Production equipment list

    Quality Testing & Certificates

    Our company is also equipped with a full set of physical and chemical testing, including spectrometer direct reading, non-destructive testing, heat treatment, water pressure testing, and other product quality testing equipment, providing a reliable guarantee for the production of high-quality products.

    • Metallographic Analyzer
      Metallographic Analyzer
    • Tensile Testing Machine
      Tensile Testing Machine
    • Thickness measurement
      Thickness measurement
    • Magnetic particle inspection
      Magnetic particle inspection
    • Hardness testing
      Hardness testing
    • Physical and chemical testing
      Physical and chemical testing
    • Impact test
      Impact test
    • Ultrasonic testing
      Ultrasonic testing
    • Low temperature testing
      Low temperature testing
    • Direct-Reading Spectrometer
      Direct-Reading Spectrometer
    Testing equipment list

    Check Our Certificates

  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • GB/T 19001-2016/ISO 9001:2015
    CQM: GB/T 19001-2016/ISO 9001:2015
  • GB/T 45001-2020/ISO 45001:2018
    CQM: GB/T 45001-2020/ISO 45001:2018
  • GB/T 24001-2016/SO 14001:2015
    CQM: GB/T 24001-2016/SO 14001:2015
  • Q/SHS 0001.1-2001 Q/SY 1002.1-2013
    CQM: Q/SHS 0001.1-2001 Q/SY 1002.1-2013
  • FAQs

    Yes, we are a flange pipe fittings manufacturer located in Cangzhou, Hebei, China. Founded in 2000, we cover an area of ​​150,000 square meters, with a building area of ​​30,000 square meters. We currently have more than 300 employees and are a relatively large and powerful Chinese flange manufacturer.

    The company has 8 pipe fittings production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot push machines, reducer hot mold presses, tee cold extrusion hydraulic presses, forging hammers, vertical lathes, drilling machines and other processing and machining equipment. Among them, the φ1020 mm large-diameter medium-frequency hydraulic push machine, φ1420 mm large-diameter medium-frequency bending machine, and φ2438 mm 4,000-ton large-scale hot mold press have an annual production capacity of more than 80,000 tons.

    For standard models, our factory has a large inventory, and the delivery time is usually only a few days. For non-standard parts, we also have a large reserve of raw materials and multiple production lines, which will save one-third of the time compared to other manufacturers and ship them to you as soon as possible.

    We have our own testing system. Each batch of goods will have a corresponding product certificate and quality inspection report. At the same time, we have ISO9001 product quality certification, classification society certificate, ASNE quality certificate and other international authoritative quality certification certificates. We will never ship out unqualified products. In addition, we support customers to entrust third-party inspection companies for inspection and acceptance.

    Of course, you can provide us with drawings or samples for customization, or you can ask us to design and customize your exclusive flange pipe fittings for you. Learn More>>

    Our products are used in oil, gas, chemical industry, machinery, shipbuilding, aerospace, electricity, pharmaceuticals, construction engineering, water conservancy engineering, and marine engineering. Don’t worry about some special fields with high requirements. We have strong production capacity and rich production experience and can provide you with professional solutions. You can send us your working conditions and we can give you a solution for free.

    Our company can provide you with samples for free, you can contact sales to request samples.

    Of course, you are very welcome to visit our factory. We will also arrange meals and accommodation for you. If you have enough time, we can also take you to visit China’s famous mountains and historical sites, so that you can better understand China and our culture. It will be worthwhile and we look forward to seeing you.

    202404223 1

    Middle Eastern customers visit Yanhao pipe fittings factory

    A company in the Middle East that specializes in providing services for petroleum sent a representative to our Chinese flange factory in April 2024. After a long inspection, the customer…
    Read More Middle Eastern customers visit Yanhao pipe fittings factory

    We are the source manufacturer. If you have the strength, you will get more favorable prices, faster delivery and more guarantees if you purchase directly from us. We will have professional sales staff to track customers’ orders throughout the process, update the order status in real time, and let customers know their order progress and product quality in real time.

    We support payments in over 40 currencies worldwide.

    We have a long-term logistics transportation company that supports sea, land and air transportation to ensure that customers receive the goods on time. At the same time, if customers have a cooperative logistics company, we will still fully cooperate with your logistics company to ensure that customers can receive the goods as soon as possible.

    Having Questions? Contact Now!

    • Tel: +86-133-1307-3735
    • Email Us: sales@yanhaocn.com
    • Whatsapp:  +86 13313073735

    As a leading Chinese flange manufacturer, we are committed to delivering superior-quality pipe flanges at competitive prices.

    Our extensive experience and cutting-edge production technology ensure that our products meet the highest industry standards.

    We pride ourselves on our ability to provide tailored solutions to meet the diverse needs of our clients, ensuring that our flanges are perfectly suited for a wide range of applications.

    Trust us to be your reliable partner for all your flange requirements.

    Service

    • Custom Flanges

    Flange Types

    • Weld Neck Flanges
    • Socket Weld Flanges
    • Slip-On Flanges
    • Lap Joint Flanges
    • Threaded Flanges
    • Blind Flanges

    Flange Materials

    • Stainless Steel Flanges
    • Carbon Steel Flanges
    • Alloy Steel Flanges

    Flange Standards

    • B16.47 Flanges
    • B16.5 Flanges
    • EN Standard Flange

    Quick Links

    • Home
    • About Us
    • Contact
    • Project Cases
    • Resources
    • Blog

    © 2000 - 2025 Hebei Yanhao Pipeline Equipment Co., Ltd.

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    • Home
    • Flanges
      • ASME/ANSI B16.47
        • Series A
          • Class 150 Welding Neck
          • Class 150 Blind Flange
          • Class 300 Welding Neck
          • Class 300 Blind Flange
          • Class 400 Welding Neck
          • Class 400 Blind Flange
          • Class 600 Welding Neck
          • Class 600 Blind Flange
          • Class 900 Welding Neck
          • Class 900 Blind Flange
        • Series B
          • Class 75 Welding Neck
          • Class 75 Blind Flange
          • Class 150 Welding Neck
          • Class 150 Blind Flange
          • Class 300 Welding Neck
          • Class 300 Blind Flange
          • Class 400 Welding Neck
          • Class 400 Blind Flange
          • Class 600 Welding Neck
          • Class 600 Blind Flange
          • Class 900 Welding Neck
          • Class 900 Blind Flange
      • ASME/ANSI B16.5
        • ANSI B16.5 Class 150 Flanges
        • ANSI B16.5 Class 300 Flanges
        • ANSI B16.5 Class 400 Flanges
        • ANSI B16.5 Class 600 Flanges
        • ANSI B16.5 Class 900 Flanges
        • ANSI B16.5 Class 1500 Flanges
        • ANSI B16.5 Class 2500 Flanges
      • Flange types
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