Body Flanges: Pressure Rating ANSI Class 150-2500

Component Specifications

Definition

Body flanges are precision-machined interface components in control valve systems that provide a bolted connection between the valve body and adjacent piping. They feature standardized bolt patterns, gasket surfaces, and pressure ratings to ensure leak-proof sealing under varying operational conditions including temperature fluctuations, pressure differentials, and fluid dynamics. These flanges serve as both structural supports and sealing interfaces in industrial fluid handling systems.

Working Principle

Body flanges create a sealed interface through compressive force applied by bolts, which compresses a gasket between mating surfaces to prevent fluid leakage. The flange faces are machined to specific surface finishes (typically Ra 3.2-6.3 μm) to optimize gasket compression and sealing effectiveness while maintaining alignment and structural integrity under operational stresses.

Materials

Common materials include ASTM A105 carbon steel, ASTM A182 F304/F316 stainless steel, duplex stainless steels (2205), and alloy steels (A350 LF2). Material selection depends on service conditions: pressure rating (Class 150-2500), temperature range (-196°C to 538°C), and fluid compatibility (corrosive/erosive media).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	Raised face (RF), Ring-type joint (RTJ), Flat face (FF)
Surface Finish	125-250 AARH (3.2-6.3 μm Ra)
Pressure Rating	ANSI Class 150-2500
Temperature Range	-196°C to 538°C (material dependent)
Bolt Circle Diameter	As per ASME B16.5 standards
Dimensional Standard	ASME B16.5, EN 1092-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ASME B16.5, EN 1092-1, API 6D, ISO 7005-1

Parent Products

This component is used in the following industrial products

Control Valve Body

The main structural housing of a control valve that contains and supports the internal flow control components.

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Engineering Analysis

Risks & Mitigation

Gasket blowout under pressure surges
Stress corrosion cracking in chloride environments
Bolt fatigue from thermal cycling
Misalignment causing uneven gasket compression

FMEA Triads

Trigger: Improper bolt torque sequence or insufficient preload
Failure: Uneven gasket compression leading to leakage paths
Mitigation: Implement calibrated torque wrench procedures with cross-pattern tightening sequence; use strain-controlled bolting methods for critical services

Trigger: Thermal cycling exceeding material expansion coefficients
Failure: Flange warping or bolt relaxation causing joint integrity loss
Mitigation: Specify materials with matched thermal expansion; incorporate flexible gasket designs; implement regular thermal cycle monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.8 mm on bolt circle diameter, ±0.4 mm on bolt hole spacing, flatness within 0.1 mm across sealing surface

Test Method

Hydrostatic testing per API 598 (1.5x rated pressure), helium leak testing for critical services, liquid penetrant examination per ASME V Article 6

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Body Flanges

Manufacturer profiles associated with Body Flanges.

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Frequently Asked Questions

What are the main differences between RF and RTJ flange faces?

RF (Raised Face) flanges have a raised sealing surface with serrations for gasket compression, suitable for most applications. RTJ (Ring-Type Joint) flanges have a groove for metal ring gaskets, providing superior sealing for high-pressure/temperature services (typically above Class 900).

How do I select the correct flange material for corrosive service?

Material selection requires evaluating fluid composition, temperature, pressure, and corrosion mechanisms. Stainless steel (316/316L) resists general corrosion, duplex steels handle chloride stress corrosion, and alloy coatings protect against specific chemical attacks. Always consult NACE MR0175 for sour service applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Body Flanges