Apologies if the comment sounded demeaning, wasnt my intention. I really appreciate all the help. Rundown tank is pressurized and its height is designed to have a max head of 6.5 psig. The overflow line at the top ensures 3% recirculation to keep the oil in the rundown tank at optimum temp. I...
In this case, shouldnt we want the standby to cut in early? The earlier it cuts in, the fast it will build the required pressure. By our data the difference between trip actuation and the pressure recovery was less than 0.4 seconds. Even a 5 PSI increase in cut-in set point could make a...
Standby is motor driven. By our data, the auto-pump start (APS63QA) right at the discharge of the pump normalized 1.5s after actuation. So that is a time of 1.5s for the stand-by to start building pressure. But The LO system should still be designed for 4-6s transient oil supply if standby is...
Please find the P&ID attached.
Both are the same.
Here is the full breakdown of the problem:
We recently experienced a tripping on the main lube oil pump motor. This led to the whole machine tripping within 1.5s while the standby pump recovered the pressure within 1.8s.
So obviously we...
Hello everyone,
I have a specific case that I needed some insight on since I am a relatively new engineer who is still learning.
We conducted a string test to check the response of a lube oil system that consisted of two pumps - 1 main and 1 standby. The main turbine driven pump was manually...
Hello everyone,
We are currently facing an issue in our urea manufacturing plant. We have observed severe external chloride SCC in a carbamate solution tank. Design data is given below, and pictures of the cracks are attached for reference. There are currently two limiting factors:
Although...
Hello,
I just graduated 6 months ago and have started working in a fertilizers plant producing Ammonia for the further end product manufacturing of Urea. We have a vertical VS7 pump with the service of Ammonia and it has a dual (front-to-back) seal from Flowserve (type: QBQW / GSL) with nitrogen...
