2 replies to this topic

[ahyong]

Dear All,

 

As mentioned in the title, this sparing philosophy thing has been confusing me a lot. For pumps 3 x 50% means that 2w+1s and both pumps functioning at 100% capacity each instead of 50%, am I right?

Now for utility boiler which is 2x50% and max capa 85000 each. Can someone please whether the total output is 85000 or 170000? I already asked few people around and their reply are confusing.

Any help will be much appreciated!~

[fallah]

ahyong,

 

In 3*50% pumps one pump is considered as spare and the other two pumps work based on parallel pumps rules; i.e the total capacity is normally lower than 2*each pump's rated capacity (for identical pumps). This matter should be considered in selecting parallel pumps to handle the required design flowrate.

 

2*50% utility boilers is another story and their total output would be twice of the one boiler capacity i.e. total required capacity. Obviously in this case mostly because of much more equipment size and cost, there is no spare boiler in the equipment arrangement...

[ahyong]

ahyong,

 

In 3*50% pumps one pump is considered as spare and the other two pumps work based on parallel pumps rules; i.e the total capacity is normally lower than 2*each pump's rated capacity (for identical pumps). This matter should be considered in selecting parallel pumps to handle the required design flowrate.

 

2*50% utility boilers is another story and their total output would be twice of the one boiler capacity i.e. total required capacity. Obviously in this case mostly because of much more equipment size and cost, there is no spare boiler in the equipment arrangement...

Fallah,

 

Thanks a lot for the clear explanation!!