Since Product is dirty, ECS is not proper selection.
My recommendation will be
Double Seal in Tandem (Inboard Seal Hard Face combination) with Plan 53 (You may choose between A'B or C in which you are comfortable)
API has given general guideline for providing flushing in different conditions.
You will have to evaluate and decide which API Plan is best suited for your requirement.
My choices are as bellow
1. I prefer API PLAN 13 over PLAN 11.
In case of Plan 11 flushing liquid impinges on the seal...
In Plan 53 A compatible barrier fluid is used. the barrier fluid is to be selected by user.
the reason why Plan 53 A will help is - the inboard seal will get lubrication from barrier fluid, instead of process fluid.
In Plan 52 , liquid between the Inboard seal faces are process liquid. In the beginning till proper bedding in of the faces take place there is a chance of seal leakage. After sometime normally it reduces.
I suggest instead of Plan 52 if you go for Plan 53 A, you may not face similar problem.
It is possible to solve your problem by providing a double seal.
Do you have enough space oto mount a double seal.between inboard seal and vessel cavity long throat bush can be given to reduce temperature in seal area.
I suggest that please provide shaft diameter and axial space available.
1. You can go for Natural Draft Air Cooler.
2. Since Temperature is only 50 deg C, Barrier fluid temperature may not go above 70 deg C. if it is acceptable to you , it is not necessary to go for barrier fluid cooling.
3. Plan 76 is normally recommended for volatile liquid, therefore it should...
In all Mechanical Seals one part will be stationary and other part will be rotating.
Stationary Seals are the Mechanical Seals in which Springs are Stationary.
Rotating Seals are the Mechanical Seals in which Springs are stationary.
I am not able to upload the sketch, therefore request you...
I see that Mechanical Seal is rotating seal (Spring is rotating)
Stationary Seals perform better when there is vibration.
I see there is bearing in the cartridge. Therefore vibration should not matter much as bearing will control run out.
My opinion is
First you change the API Plan to...
Please find enclosed comparison of API Plan 53 A, Plan 53 B and Plan 53 C.
In API Plans A and B barrier fluid pressure is maintained at about 2 kg/cm 2 above maximum vessel pressure. Due to this outboard seal is subjected to maximum pressure during stand still as well running condition...
