What Additional Substances Are Used for Effective Gasket Sealing?
What Additional Substances Are Used for Effective Gasket Sealing? A gasket is designed to seal two mating surfaces and prevent leakage under pressure, temperature and varying process conditions. In many applications, the gasket alone performs exactly as intended. However, certain operating environments demand additional support to maintain a reliable seal over time. The important question isn’t “Which sealant should I use?”—it’s “Does this application actually need one?” Using the wrong sealing compound, applying excessive sealant or relying on additional materials to compensate for poor installation can create more problems than it solves. Understanding where these products fit into gasket sealing helps improve equipment reliability, reduce maintenance and minimise unexpected downtime. When Should Additional Sealing Substances Be Used? Additional sealing products are usually considered when operating conditions place extra stress on the gasket or sealing surface. Common situations include: High operating temperatures High-pressure systems Slightly worn or imperfect flange surfaces Aggressive chemicals Steam applications Frequent equipment maintenance Corrosive environments For example, a chemical processing plant handling aggressive media may require a chemically compatible sealing compound, while a steam pipeline operating at elevated temperatures may benefit from graphite-based lubricants on fasteners to maintain consistent bolt preload. The choice always depends on the process—not simply on the gasket. Common Substances That Support Gasket Sealing Gasket Sealants Gasket sealants are applied as a thin coating to improve contact between the gasket and flange surfaces. They help compensate for minor surface imperfections but should never replace proper flange preparation or correct gasket selection. They are commonly used in: Pumps Gearboxes Compressors Process pipe flanges Applying more sealant does not create a better seal. In many cases, excessive sealant can squeeze into the process line and contaminate equipment. PTFE Tape PTFE tape is one of the most recognised sealing materials, but it is frequently misunderstood. It is intended for threaded pipe connections—not flat gasket faces. Typical applications include: Instrumentation fittings Threaded valves Pipe threads Pneumatic connections Using PTFE tape on flange gasket surfaces is generally not recommended because the gasket is already designed to provide the sealing function. Anti-Seize Compounds Anti-seize compounds are applied to bolts, studs and fasteners rather than the gasket itself. Their purpose is to: Prevent thread galling Reduce corrosion Improve bolt tightening consistency Simplify future maintenance Uniform bolt loading is one of the most important factors in achieving reliable industrial gasket sealing. Graphite Lubricants Graphite lubricants are commonly selected for high-temperature applications where conventional lubricants may degrade or lose their effectiveness. They are widely used in: Boilers Steam systems Thermal processing equipment High-temperature pipework These lubricants help maintain consistent fastening performance during repeated maintenance cycles. Application-Specific Sealing Compounds Certain industries require specialised sealing products designed for specific operating conditions. Examples include: Food-grade sealing compounds Chemical-resistant sealants Oil and gas sealing compounds Pharmaceutical-approved sealing materials Selecting the correct product requires considering the process media, operating temperature, pressure and gasket material. When Additional Sealants Should NOT Be Used One of the biggest misconceptions in industrial maintenance is that adding more sealant automatically improves sealing performance. In reality, additional sealing compounds may be unnecessary when: Flange faces are clean and undamaged. The correct gasket material has been selected. Bolts are tightened correctly. The manufacturer’s installation recommendations are followed. Modern industrial gaskets, including PTFE, graphite and spiral wound gaskets, are often designed to perform without additional sealants. Common Mistakes That Cause Gasket Failure Many sealing failures occur during installation rather than because of the gasket itself. Some of the most common mistakes include: Applying excessive gasket sealant Mixing incompatible sealing compounds Using PTFE tape on flange faces Reusing compressed gaskets Ignoring damaged flange surfaces Uneven bolt tightening Selecting the wrong gasket material Following recognised installation practices, such as ASME PCC-1 bolt tightening guidelines where applicable, can significantly improve sealing reliability. Choosing the Right Sealing Solution Before selecting any additional sealing substance, ask these questions: What fluid is being sealed? Is the media chemically aggressive? What are the operating temperature and pressure? What gasket material is being used? Is the flange surface in good condition? Will the equipment be dismantled regularly? These answers often determine whether the gasket alone is sufficient or whether supporting sealing materials are beneficial. Sealing Material Best Used For Avoid When Gasket Sealant Minor flange imperfections Good flange surfaces with modern gasket materials PTFE Tape Threaded connections Flat gasket joints Anti-Seize Compound Bolts and fasteners Gasket sealing surfaces Graphite Lubricant High-temperature bolting Low-temperature general applications Frequently Asked Questions Can gasket sealant replace a damaged gasket? No. Sealants are designed to support gasket performance, not compensate for damaged or incorrectly selected gaskets. Is PTFE tape suitable for flange connections? Generally no. PTFE tape is intended for threaded fittings rather than gasket sealing surfaces. Can too much gasket sealant cause leaks? Yes. Excess sealant may interfere with gasket compression or enter the process system. Which industries commonly use additional sealing substances? Chemical processing, oil & gas, food manufacturing, pharmaceutical production, power generation and water treatment frequently use specialised sealing products. How can gasket sealing performance be improved? Selecting the correct gasket material, preparing flange surfaces properly, tightening bolts evenly and using additional sealing products only when required provides the most reliable results. Final Thoughts Reliable gasket sealing is rarely achieved by adding more sealing compounds. It begins with selecting the correct gasket material, understanding the operating conditions and following good installation practices. Additional substances such as gasket sealants, PTFE tape, anti-seize compounds and graphite lubricants each have a specific purpose. When selected correctly, they help improve sealing performance and reduce maintenance. When used incorrectly, they can create unnecessary reliability issues. Rather than treating every application the same, evaluate the process conditions, media compatibility and equipment design before deciding whether additional sealing materials are required. Industrial facilities handling demanding process conditions often benefit from using high-quality industrial gaskets, compatible sealing solutions and correctly selected instrumentation to improve long-term equipment reliability. ADYAA supports industries across Australia with a comprehensive range of industrial sealing products, helping maintenance teams and engineers choose solutions that match their application rather
Flange Sealing Solutions for High-Pressure Pipes: Zero Leakage Strategies
Flange Sealing Solutions for High-Pressure Pipes: Zero Leakage Strategies In high-pressure industrial environments, the weakest link is rarely the pipe itself it is the connection point. When you are moving steam at 100 bar or processing hydrocarbons at extreme temperatures, a standard gasket isn’t just a seal; it is a critical safety barrier. A failed flange seal leads to more than just a hiss of escaping steam. It causes unplanned shutdowns, environmental fines, and safety hazards for personnel. To prevent blowout, engineers must move beyond ‘off-the-shelf’ gaskets and engineer specific Flange Sealing Solutions for High-Pressure Pipes that can withstand the immense forces at play. The Challenge of High Pressure Why do high-pressure seals fail? It usually boils down to three forces fighting against the gasket: Internal Pressure: The fluid tries to push the gasket out of the flange (blowout force). Bolt Stretch: High pressure tries to separate the flange faces, reducing the compression load on the gasket. Thermal Cycling: Rapid heating and cooling cause the metal flanges to expand and contract, often crushing the gasket or leaving it loose. Effective High-Pressure Gaskets must maintain their seal integrity despite these aggressive dynamics. 1. Metallic Gaskets: The Standard for Strength For ASME Class 900 flanges and above, soft gaskets (like rubber or PTFE) are simply not an option. You need metal to hold the pressure. Ring Type Joints (RTJ) This is the gold standard for the oil and gas industry. An RTJ Gasket is a solid metal ring (typically soft iron or stainless steel) that sits inside a groove machined into the flange face. How it works: When bolted down, the harder flange wedges the softer metal ring into the groove, creating a metal-to-metal seal that gets tighter as internal pressure increases. Best For: Extreme pressure (up to 20,000 psi) and high-temperature applications. Spiral Wound Gaskets (SWG) The most versatile high-pressure solution. It consists of a metal winding (usually stainless steel) filled with a soft material like flexible graphite. How it works: The metal winding provides structural strength and blowout resistance, while the graphite filler fills the microscopic imperfections on the flange face to create a seal. The Critical Component: For high pressure, always choose an SWG with an Inner Ring. This ring protects the sealing element from the turbulent flow of the fluid and prevents the gasket from buckling inward. 2. Kammprofile Gaskets: The Problem Solver When you have older flanges with pitted or damaged surfaces, or you need to seal a heat exchanger, the Kammprofile Gasket (or Camprofile) is the superior choice among Flange Sealing Solutions for High-Pressure Pipes. It features a solid metal core with serrated grooves on both sides, covered by a soft facing layer (Graphite or PTFE). The serrations concentrate the bolt load into small areas, creating a massive amount of sealing stress with relatively low bolt torque. This makes them ideal for vintage equipment where you cannot over-torque the bolts without damaging the flange. 3. Installation: Where Most Seals Fail You can buy the most expensive RTJ Gasket on the market, but if it is installed poorly, it will leak. Torque Control: Using a torque wrench is mandatory. Uneven tightening warps the gasket. Flange Condition: High-pressure seals require a specific surface finish. An RTJ groove must be mirror-smooth, while a Spiral Wound gasket needs a specific roughness to ‘bite’ into. Lubrication: Friction on the bolt threads steals torque. Using a high-quality lubricant ensures that the force you apply actually compresses the gasket. The Bottom Line A leak at 10 psi is a nuisance. A leak at 10,000 psi is a catastrophe. Selecting the right Flange Sealing Solutions for High-Pressure Pipes requires balancing the pressure rating, the chemical compatibility, and the mechanical condition of your flanges. Whether it is a robust Ring Type Joint for a wellhead or a precision Kammprofile for a reactor, the goal is always the same: zero emissions, zero downtime. Are your high-pressure connections secure? Don’t guess with gasket selection. Let our sealing experts review your application parameters. Explore ADYAA’s Industrial Sealing Range. Contact us for technical advice on high-pressure gaskets. Recent Posts When to Replace Rupture Discs in Pressure Equipment: A Maintenance Guide When to Replace Rupture Discs in Pressure Equipment: A Maintenance Guide In the world of pressure safety, the rupture disc… Read More → Flange Sealing Solutions for High-Pressure Pipes: Zero Leakage Strategies Flange Sealing Solutions for High-Pressure Pipes: Zero Leakage Strategies In high-pressure industrial environments, the weakest link is rarely the pipe… Read More → How to Select Pressure Relief Valves for Industrial Plants How to Select Pressure Relief Valves for Industrial Plants If a pump fails, production stops. If a control valve fails,… Read More →