API 6A Flanges Suppliers

Product Specification Levels (PSL) in API 6A flanges define the technical and quality requirements for materials, testing, and documentation based on the intended application’s severity. They are critical in oil & gas to ensure performance, traceability, and safety.

Here’s a breakdown:

1. PSL 1: Basic level — minimum testing and documentation. Suitable for less critical services.
2. PSL 2: Includes all PSL 1 requirements + additional chemical analysis, NDE (non-destructive testing), and mechanical tests.
3. PSL 3 & PSL 3G: Advanced levels — for high-risk operations like deep wells or sour service; require full traceability, full-length NDE, hardness testing, and impact testing.
4. PSL 4: Most stringent level, typically used in critical offshore or high-pressure HPHT environments.

Choosing the correct PSL is vital to ensure long-term reliability of flanged connections under extreme pressure and temperature variations.

API 6A flanges are designed for high-pressure wellhead and Xmas tree equipment, and their selection depends on operating pressure, temperature, and service conditions.

The available pressure ratings (classes) under API 6A are:

• 2,000 psi
• 3,000 psi
• 5,000 psi
• 10,000 psi
• 15,000 psi
• 20,000 psi

Selection Criteria:

• Well depth & pressure zones: Deeper wells or HPHT conditions typically require 10K, 15K, or 20K flanges.
• Application area: For choke & kill manifolds, blowout preventers (BOPs), and subsea Christmas trees, higher pressure ratings are mandatory.
• Safety factors: Always chosen based on required design pressure + safety margins.

API 6A strictly regulates these pressure classes, ensuring flanges are matched correctly with other equipment such as valves and connectors.

API 6A flanges are manufactured using strictly controlled material grades, defined by Material Class Codes such as AA, BB, DD, EE, and so on. These classes indicate mechanical strength, corrosion resistance, and NACE compliance.

Here are the commonly used material classes:

1. AA / BB – Carbon Steel (non-sour service, general use)
2. CC / DD – Low Alloy Steel (for higher strength or moderate sour service)
3. EE / FF – Corrosion-resistant alloys (CRA) for H2S environments (NACE MR0175)
4. HH – High Nickel-based alloys like Inconel or CRA cladding for extreme sour service

These materials are tested to meet:

• API 6A hardness limits
• Impact testing requirements
• NDE and heat treatment standards

Nutech offers full traceability and documentation for all materials, compliant with PSL levels and application requirements.

API 6A flanges are engineered for use in high-pressure, high-risk environments typically found in upstream oil & gas operations. Their robust design, PSL classifications, and sealing types make them suitable for:

Primary Applications:

1. Wellhead Assemblies – connecting casing heads, tubing spools, and hangers
2. Christmas Tree Systems – for flow control at the surface
3. Blowout Preventers (BOP) – as part of pressure control equipment
4. Choke & Kill Manifolds – where accurate pressure control is required
5. Mudline Suspension Systems
6. Subsea Equipment – like subsea trees and control modules

These flanges are selected for their sealing integrity under cyclic pressure, corrosion resistance, and API 6A standardization, which ensures interoperability across OEM components.

In critical zones like offshore rigs, desert fields, and sour service reservoirs, API 6A flanges are essential for system safety and performance.

We are a trusted manufacturer and global exporter of high-performance API 6A flanges, catering to the stringent requirements of the oil & gas, drilling, and offshore sectors across continents.

Key Export Destinations Include:

• United Arab Emirates (UAE)
• Saudi Arabia
• Oman
• Qatar
• Kuwait
• USA
• Canada
• Mexico
• Brazil
• United Kingdom (UK)
• Germany
• Italy
• Indonesia
• Malaysia
• Vietnam
• Nigeria
• South Africa

With on-time delivery, PSL-certified documentation, and tailored packaging, Nutech ensures its API 6A flanges meet global project specifications for both onshore and offshore installations.