Fire Water Pump Gear Box Overheating
Fire Water Pump Gear Box Overheating
(OP)
When engine driven vertical turbine type fire water pup is shop tested, right angle gear box temperature is found to be 62 deg above ambient for radial bearing and 42 deg above ambient for thrust bearing. Pump is 5000 gpm capacity with head of 132 m. Same temperature is found in similar 4 pumps. Gear box sizing is checked and found meeting power rating, downthrust and speed. What can be the causes? which one is likely to be faulty - gear box or pump?





RE: Fire Water Pump Gear Box Overheating
Is there supposed to be oil circulation or other gearbox cooling??
I get the power to be approx. 600kW so if even a very small percent is released as heat in the G Box it will heat up qite a lot.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Fire Water Pump Gear Box Overheating
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Fire Water Pump Gear Box Overheating
Johnny Pellin
RE: Fire Water Pump Gear Box Overheating
The gear box is provided with cooling coils, water taken from fire water pump discharge. The shop test site ambient temperature is 20 DegC. The actual site maximum temperature is 50 Deg C.
The temperature rise observed during tests is 62 and 42 Deg C. These are above permitted temperature rise of API 610. At site, actual temperature can go as high as 112 Deg C.
The gear box is using spherical roller thrust bearings which requires a minimum downthrust to operate. If pump impeller bottom touches casing, downthrust will be taken by casing and spherical roller bearing will operate without downthrust and can cause hearing heating and failure.
The engine speed is 1825 rpm, for gear box maximum input speed is 3520 rpm. Hence speed is OK. Maximum absorbed power is 615 kW. Engine power rating is 738 kW at 1825 rpm, Gear box rating is 695kW at same speed. Hence power rating is OK.
RE: Fire Water Pump Gear Box Overheating
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Fire Water Pump Gear Box Overheating
RE: Fire Water Pump Gear Box Overheating
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.
RE: Fire Water Pump Gear Box Overheating
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Fire Water Pump Gear Box Overheating
RE: Fire Water Pump Gear Box Overheating
Edited to add: Have you involved the bearing manufacturer with your concerns?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Fire Water Pump Gear Box Overheating
RE: Fire Water Pump Gear Box Overheating
Why will the impeller hit the pump casing if the impeller is set correctly during installation, seems I missed this secondary question along the way as you started out talking about temp. rise of the bearings during test.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Fire Water Pump Gear Box Overheating
Johnny Pellin
RE: Fire Water Pump Gear Box Overheating
Cooling water outlet is on fire water pump discharge elbw.
RE: Fire Water Pump Gear Box Overheating