Mechanical seal technical manual

Nevertheless, if the mechanical seals are not operated within their intended purpose or handled inexpertly by untrained personnel, they may cause risks. The user has to check what effects a failure of the mechanical seal might have and what safety measures have to be taken to prevent personal injury or damage to the environment.

The pump has to be put up in such a way that seal leakage can be led off. The pump has to be disposed properly to avoid any injury caused by spurting product in the event of a seal failure. The EagleBurgmann BT mechanical seals must be operated, maintained or repaired by authorized, trained and instructed personnel only. In principle, any work to be done on the mechanical seal is permitted when the seal is neither operating nor pressurized. The responsibilities for the respective jobs to be done have to be determined clearly and observed to prevent unclear competencies from the point of safety.

If the user needs this requirement, please contact our offices to check if the working parameters are included in the range of application of our products. In this case the user should contact our offices to verify the compatibility of the materials. This could result in a seal shorter life time and in the risk of a sudden seal failure, dangerous for people and environment.

If the seal has to be operated under different condiwww. NU - FN. NU - FH. NU - RN3. NU - RN6. KU - RN3. KU - RN6. NB - RN3. NB - RN. KB RN3. KU - C KB - C It is important to avoid a dry running of the seal.

The media to be sealed should not damage the mechanical seal chemically corrosion, embrittlement nor physically erosion, abrasion. The seals also fit to be used as multiple mechanical seals in a tandem arrangement together with a quench supply or as double mechanical seals together with a fluid barrier system.

Seal design, manufacture tolerances, operating conditions, quality of the machine, etc. In fact, compared to other dynamic sealing systems, a mechanical seal has a smaller leakage. A possibly increased leakage www. The leakage can be liquid or gaseous, depending on the aggressiveness of the medium to be sealed. The medium may splash out if the seal fails.

Personal injury may be prevented by the user providing for splash protection and wearing safety glasses. The user has to take care of proper disposal of the leakage. Leakage of the mechanical seal at the outboard side has to be drained and disposed properly. Components which may get in contact with the leakage have to be corrosion-resistant or have to be properly protected. The warning indications and notes on the packing must be observed.

Do not damage or lose parts supplied Check if consignment is complete delivery note. A preservation of the EagleBurgmann BT mechanical seals is not necessary. Do not use anticorrosive. Sliding materials and elastomers are subject to material-specific and time-based alterations distortion, aging which might reduce the full efficiency of the seals.

This may be avoided by observing the storage instruction. Damages caused by improper storage may not be claimed on the EagleBurgmann BT company concerning their warranty. Store the mechanical seals in their original packing, lying on a flat sur1 For storage of elastomers parts, following International Norm ISO www.

The run-out tolerances depend on the shaft rotation speed. Exceeding the above values, the seal life decreases and fluid leakages can occur. The seal should remain packed until the assembly; operations have to be done in dust-free surroundings. Cleanness must be as well observed for the different pump components, as chips and blasting traces can damage the seal irreparably.

Should any seeger seats, locks for keys or sharp-edged seats be present on the shaft, the use of pushers or mounting sleeves is required, thus avoiding to compromise the secondary seals integrity cuts on bellows or o-rings.

For installation, the assembly drawing of the mechanical seal working length and the related dimensions has to be available. At this point: - Unpack the seal and check seal face, seat and elastomer bellows for possible damages.

In case of severe assembly, to reduce the seal friction, sprinkle the seat www. Oil or grease as assembly agent has to be avoided absolutely. Keep the shaft wet if the distance to slide the seal is rather long. Seal surfaces must be clean and dry. Do never force during installation. Absolutely avoid the seal is having impacts or shocks. If by accident the seal drops to the ground, its integrity must be verified and eventually replace the seal with a new one.

Never put EPDM elastomers in contact with mineral oils or greases. For any problem or anomaly, please contact our technical department for the proper explanations and information.

Following the above instructions helps to avoid damages to the sealing system and subsequent leakage. The EagleBurgmann BT mechanical seals types RN, FN, and FH, driven by a conical spring, have dependent direction of rotation, therefore it must be ensured that, looking toward the seal face, the shaft direction of rotation and the winding direction of the conical www. To prevent damage of the sliding faces from dry running, the buffer space must be carefully vented.

Now the seal is ready for operation. The mechanical seal constantly has to be wetted by the product in its liquid form, especially when the pump is started or stopped. The need for a fluid film between the faces presents a design challenge — allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself.

This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces. The gap between the faces on a typical seal is as little as 1 micron — 75 times narrower than a human hair.

This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces the fluid film acts to push them apart. Without the pressure pushing them apart the two seal faces would be in full contact, this is known as dry running and would lead to rapid seal failure.

Without the process pressure and the force of the springs pushing the faces together the seal faces would separate too far, and allow fluid to leak out. Mechanical seal engineering focuses on increasing the longevity of the primary seal faces by ensuring a high quality of lubricating fluid, and by selecting appropriate seal face materials for the process being pumped.

When we talk about leakage we are referring to visible leakage of the seal. This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other.

By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free.

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Other sections. Catalog excerpts. Mechanical Seal Products Open the catalog to page 1. Open the catalog to page 2. Open the catalog to page 3. Open the catalog to page 4. When we talk about leakage we are referring to visible leakage of the seal.

This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other. By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free.

What we can say, however, is that unlike gland packing, the amount of leakage on a mechanical seal should be so low as to be visually undetectable. A recent case study indicated - Upgrading from packing reduces water usage and operating costs. Skip to main content. Enter your keywords. What is a Mechanical seal? Home Resources Academy. Basics of fluid pump sealing A mechanical seal is simply a method of containing fluid within a vessel typically pumps, mixers, etc.