Pipe Seals and Sealing: A Guide for Water and Gas Lines
Reliable sealing in pipelines is the key factor that determines the longevity and safety of the entire system. In connections used to transport water, gas or other fluids, a properly selected rubber seal prevents leaks, minimizes pressure loss and extends the service life of the equipment.
The purpose of pipe seals
A seal fills the gap between two surfaces and ensures tightness even under internal pressure. On pipe flanges, couplings and threaded connections, the seal both compensates for mechanical load and absorbs the expansion caused by temperature changes. Three factors are decisive for proper sealing: material, profile shape and degree of compression.
Profile selection for water lines
In drinking water and hot water systems, EPDM rubber is the most widely used solution. This material offers high resistance to ozone, ultraviolet rays and hot water, while also being safe in contact with drinking water. EPDM seals typically remain stable in the range from -40 °C to +120 °C.
You can read more detailed information about the properties of EPDM in our article what is EPDM rubber. Typical profiles used in water lines:
- O-ring (circular cross-section): a universal solution for coupled and threaded connections.
- Flat seal: provides wide surface contact in flange connections.
- Lip profile: a self-sealing shape that creates tighter sealing as pressure increases.
Hot water and steam lines
On high-temperature lines, the heat resistance of EPDM is an advantage. However, if there is a possibility of contact with oil or petroleum products, EPDM is not suitable.
Gas lines and oil-resistant seals
In natural gas, oil and oily environments, NBR (nitrile) rubber is the primary material. NBR has high resistance to hydrocarbons, gasoline and oils. Extensive information about this material is given in our article NBR oil-resistant rubber. Since a leak in gas connections is a safety matter, choosing a certified seal of the correct size is important.
Installation and operation rules
Even if the right material is selected, incorrect installation can cause leaks. Follow these rules:
- Clean the seal groove and contact surfaces of dirt and rust.
- Do not over-compress the seal — this leads to deformation and cracking of the material.
- Select the seal size to match the pipe diameter and groove dimensions.
- During annual inspection, check for signs of hardening or cracks.
NUR KAUÇUK MMC manufactures seals of various profiles for water, gas and industrial pipelines at its own production facility. We can help you choose the size and material that match your project requirements.
If you want to choose a suitable seal solution for your pipelines, explore our products and contact us for technical support.