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6 REASONS WHY MECHANICAL SEALS FAIL
Dec 20, 2017

                                                           


1.  ALLOWING THE PUMP TO RUN DRY

Allowing your pump to run dry can be very damaging to a
mechanical seal. Under the right conditions, mechanical seals can experience thermal shock and shatter within 30 seconds or less.

  

2. VIBRATION


Pump vibration is caused by pump imbalance, improper alignment, operating the pump too far to the right or left of the BEP (Best Efficiency Point) on the performance curve, etc. Vibration hurts your equipment and can result in damaged seals and shortened seal life.


3. HAMMERING COUPLINGS ONTO THE SHAFT

When it comes to pumps, hammers are not friends! Mechanical seal faces can be very fragile. Pounding couplings onto the shaft will damage the mechanical seal. 


4. OPERATOR ERROR

Skipping initial start-up procedures and installation errors are a big factor when it comes to
mechanical seal failure. Improperly starting the pump can cause the motor to trip and the shaft to twist causing orbital movement, resulting in internal parts contact, seal failure, and shortened bearing life. Improperly installing the mechanical seal will cause damage to elastomers (o-rings or boots), along with a wide variety of other issues, as pictured to the right. Mechanical seals can be very sensitive because the faces are incredibly flat. Even a small amount of dirt or oil, even fingerprints, can cause the faces not to align.


                                                             


5. IMPROPER USE OF, OR COMPLETELY OMITTING MECHANICAL SEAL FLUSH PLANS

It's critical that a mechanical seal flush plan is properly in place. No mechanical seal recommendation is complete without a coordinating flush plan. Be Aware: if no flush plan exists, dewatered product and contaminates can build up, causing excessive heat or erosion on the seal, resulting in shortened seal life


6. ELECTING THE WRONG MECHANI­CAL SEAL OR MATERIALS

Lack of knowledge and information accounts for the majority of
mechani­cal seal installation errors. Consider normal operating conditions, potential for off-design excursions and non-process activities, such as cleaning, steaming, acid and caustic flushes. The picture to the right is an example of poor material choice for an abrasive liquid.


Contact Us:

Shaanxi DaoLin Mechanical & Electrical Co.,Ltd

Room1107, Building B, Sail Times Plaza, Hou Wei Zhai, Wei Yang 

District, 710085, Xi’an  City, Shaanxi Province, China

Tel.:+86(029)84523807-802 Fax: +86(029)84523807-808

Email: sales@inseals.com

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