Double mechanical seal plus plan 54 or Double mechanical seal with contact and non-contact face with gas barrier should resolve the problem .
Go to Flowserve Mechanical seal contact....
Hi,
The more common problem of cavitation is because poor succion pressure.
But there are others cavitation problems because of high velocity, eddy in recirculation flows, eddy in over capacity and thermal cavitation.
You have a lot of system characteristics that you can change to improve NPSH...
Hi,
Operate over BEP to more than 120% you have:
1. More power consumption.
2. More NPSHr with cavitation failure risk.
3. Erosion in high velocity zones, Cut water, suction, discharge vanes zone, etc.
3. More radial load with bearing and shaft failure risk.
4. Global vibration levels increase...
It is an issue to make a field test for vertical turbine pump.
HI standars will help, but depends of size of pump you have.
A complete vibration test, an internal inspection of bearings and wear ring impeller are also required.
Hi, as your photos, you are using Chesterton 155 cartridge Mechanical Seal,
http://www.chesterton.com/ES/Products/Pages/Product.aspx?ProductLine=MSD&Category=Cartridge Seals&ModelID=155&DocumentType=Product Brochure
Seal faces are missing in your picture so im asumming they destroyed one each...
Calculation of Axial Thrusts depend of
Impeller type and details,
Impeller dimensions,
TDH, GE,
Ns,
A good calculation method is made in ANSI/HI 1.3-2000,
You can aprox for open impeller
