Фланцы являются важными компонентами трубопроводных систем, которые создают герметичные соединения между трубами., клапаны, насосы, и другое оборудование. Однако, flange leakage remains a leading cause of equipment downtime, потеря продукта, and safety hazards across industries such as oil and gas, химическая обработка, производство электроэнергии, и морская техника.

Понимание root causes of flange leakage is critical to preventing failures, ensuring workplace safety, and maintaining system reliability. В этой статье, мы исследуем 7 most common causes of flange leakage, and how to avoid them with proper design, установка, и методы обслуживания.

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1. Improper Gasket Installation

The gasket is the sealing element between two flange faces. Even if the flange and bolts are perfect, a poorly installed gasket can lead to leaks.

Причины:

• Gasket misalignment

• Uneven compression during bolt tightening

• Using the wrong size or material

• Reusing old or damaged gaskets

• Failure to center the gasket on the sealing surface

How to Prevent:

• Always use a new, clean, and correct-sized gasket

• Center the gasket properly between flange faces

• Tighten bolts in a cross (star) шаблон to ensure even compression

• Follow manufacturer torque specifications

Сасафланж supplies a wide range of flange-compatible gaskets, including spiral wound, ПТФЭ, and graphite types for various pressure and temperature conditions.

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2. Insufficient or Uneven Bolt Torque

One of the most frequent causes of flange leaks is incorrect bolt tightening. Both under-tightening and over-tightening can cause sealing issues.

Причины:

• Torque not applied evenly

• Bolts not lubricated properly

• Using incorrect bolt materials

• Torque wrench not calibrated

• Ignoring recommended torque sequence

How to Prevent:

• Использовать lubricated bolts and calibrated torque tools

• Tighten bolts in несколько проходов (30%, 60%, затем 100% of torque)

• Follow the recommended cross-bolt tightening pattern

• Record torque values for traceability

Uneven or low bolt stress causes leaks, especially under thermal cycling. Сасафланж recommends documented bolting procedures for high-integrity flange connections.

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3. Flange Surface Damage

The integrity of a flange connection depends on the condition of the sealing surface. Even minor scratches or corrosion can compromise the seal.

Причины:

• Коррозия, питтинг, or erosion on flange face

• Improper handling or transportation

• Over-torquing or using metal tools near sealing face

• Incompatible gasket material

How to Prevent:

• Inspect flange faces for damage before installation

• Use protective covers during storage and transport

• Use gaskets that match the surface finish and pressure class

• Re-machine or replace damaged flanges as needed

Для критически важных приложений, Сасафланж offers high-precision machined flanges with serrated or smooth finishes according to ASME B16.5 или стандарты DIN.

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4. Misalignment Between Flanges

Flanges must be properly aligned both axially and angularly to create an even seal. Misalignment leads to stress on bolts, distortion of flanges, and gasket damage.

Причины:

• Improper pipe support or anchoring

• Inaccurate pipe cutting or welding

• Misjudged expansion allowances

• Forcing flange connection during assembly

How to Prevent:

• Использовать alignment tools before tightening

• Avoid forcing connections—adjust piping supports instead

• Allow for thermal expansion in piping design

• Verify alignment with feeler gauges or dial indicators

Misalignment not only causes leaks but can also lead to flange cracking over time.

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5. Thermal Cycling and Vibration

Many industrial systems experience temperature fluctuations and mechanical vibrations, which cause movement, loosening of bolts, and loss of gasket compression over time.

Причины:

• High/low temperature cycling

• Thermal expansion of pipe materials

• Вибрация от насосов, компрессоры, or external forces

• Lack of periodic bolt re-torquing

How to Prevent:

• Использовать spring washers или live-loading systems for dynamic bolt load

• Выбирать прокладочные материалы that resist thermal degradation

• Design piping systems with expansion joints или flexible couplings

• Regularly inspect and re-torque bolts during shutdowns

Сасафланж can recommend flange and gasket materials designed to withstand thermal cycling in chemical and high-temperature services.

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6. Using the Wrong Gasket or Flange Material

Each application has specific requirements based on fluid type, давление, температура, и воздействие коррозии. Using incompatible materials can lead to химическая атака, слизняк, or gasket blowout.

Причины:

• Selecting low-grade gaskets for high-pressure service

• Using carbon steel flanges in corrosive environments

• Gasket material not rated for temperature extremes

• Improper flange class for system pressure

How to Prevent:

• Match materials to process media and system conditions

• Consult material compatibility charts or request help from Сасафланж

• Использовать metallic gaskets for high-pressure or high-temperature conditions

• Follow relevant standards such as ASME B16.5 или RU 1092-1

Correct material selection reduces the risk of premature failure and ensures system longevity.

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7. Lack of Maintenance and Inspection

Even the best-installed flange can leak over time without routine inspection and preventive maintenance.

Причины:

• Gasket aging and compression loss

• Ослабление болта из-за вибрации

• Corrosion or chemical attack

• Overlooked early warning signs like slight leakage or discoloration

How to Prevent:

• Implement a scheduled inspection plan

• Monitor for leaks, ржавчина, or gasket extrusion

• Re-torque bolts at defined intervals, especially after startup

• Replace gaskets during shutdowns or maintenance cycles

Flange connections are not “install-and-forget” components. Regular maintenance ensures system integrity.

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Краткое содержание: 7 Causes of Flange Leakage