Flange Body: Bolt Hole Quantity 4 to 48 holes

Component Specifications

Definition

The flange body is the primary structural element of a forged steel flange, designed to provide a secure, leak-proof connection between piping components. It features a flat, machined face for gasket sealing, bolt holes for assembly, and a central bore matching the pipe diameter. Manufactured through hot forging processes, it exhibits superior mechanical properties including high strength, toughness, and resistance to fatigue and impact, making it suitable for critical applications in petrochemical, power generation, and heavy industrial systems.

Working Principle

The flange body works by creating a bolted, gasketed joint between two piping components. When bolts are tightened through the flange's holes, compressive force is applied, squeezing the gasket between the mating faces to form a pressure-tight seal. The forged steel construction ensures the body withstands internal fluid pressure, external loads, and thermal expansion without deformation, maintaining joint integrity under operational stresses.

Materials

ASTM A105 (Carbon Steel), ASTM A182 F304/F316 (Stainless Steel), ASTM A350 LF2 (Low-Temperature Carbon Steel), with optional coatings like galvanizing or epoxy for corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ)
Size Range	1/2 inch to 24 inches NPS
Surface Finish	125 to 250 microinches for gasket seating
Pressure Rating	Class 150 to Class 2500
Temperature Range	-29°C to 538°C depending on material grade
Bolt Hole Quantity	4 to 48 holes
Bolt Circle Diameter	As per ASME B16.5 standards

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, ASME B16.47, ISO 7005-1, DIN 2633

Parent Products

This component is used in the following industrial products

Forged Steel Flange

Forged steel ring with bolt holes for connecting pipes, valves, or equipment in industrial piping systems.

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Engineering Analysis

Risks & Mitigation

Leakage due to improper gasket seating or bolt torque
Corrosion in aggressive chemical environments
Fatigue failure from cyclic pressure or thermal stresses
Misalignment causing uneven load distribution

FMEA Triads

Trigger: Insufficient bolt torque or uneven tightening
Failure: Gasket compression loss leading to leakage
Mitigation: Use calibrated torque wrenches and follow cross-tightening patterns as per ASME PCC-1 guidelines.

Trigger: Exposure to corrosive fluids without protective coatings
Failure: Material degradation and pitting, reducing pressure integrity
Mitigation: Select corrosion-resistant materials (e.g., stainless steel) or apply protective coatings; implement regular inspection schedules.

Trigger: Thermal cycling causing expansion/contraction stresses
Failure: Fatigue cracking at bolt holes or weld necks
Mitigation: Design with adequate flexibility in piping layout; use expansion joints; ensure proper material selection for temperature range.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Bolt hole diameter ±0.8 mm, bolt circle diameter ±1.6 mm, face flatness within 0.05 mm per ASME B16.5

Test Method

Hydrostatic pressure testing at 1.5 times rated pressure for 10 minutes; non-destructive testing (NDT) such as ultrasonic or magnetic particle inspection for critical applications.

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Flange Body

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Longan Flange

Zhejiang, CN

Also makes: Pressure Vessel, Forged Steel Flange

Listed on the company's own website · profile compiled by CNFX from public sources

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the advantage of a forged steel flange body over a cast one?

Forged steel flange bodies offer superior strength, ductility, and resistance to impact and fatigue compared to cast flanges, making them ideal for high-pressure, high-temperature, and critical service applications.

How do I select the correct pressure class for a flange body?

Select based on the maximum operating pressure and temperature of your system, referencing ASME B16.5 standards. Common classes include 150, 300, 600, 900, 1500, and 2500, with higher numbers indicating greater pressure capacity.

Can flange bodies be used with different pipe materials?

Yes, but material compatibility must be considered to avoid galvanic corrosion. For example, a carbon steel flange body can connect to stainless steel pipes using appropriate gaskets and bolts, but insulation kits may be needed in corrosive environments.

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.

Flange Body