Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
(OP)
Dear All,
We are in concept development stage of a cooling water tower (fresh water). I am of the opinion that a cooling tower with extended basin to incorporate vertical turbine pumps (about 5 nos of 10,000m3/hr ; 35mts head) would be better. Other view in our group is that perhaps Horizontal pumps would be better because one could avoid the cost associated with Civil/structure for the extended basin.
I am sure those invovlved with the cooling tower/ and associated eqpt selection would have extensively done cost/ convenience/ maintenance/ reliability analysis on vertical vs horzintal pumps selection and associated merits etc.
Request all members to throw ideas, based on their experience, which is a better option. I realize that there aint a yes/no answer to this. Any guidance would be useful.
1) For the basin sludge removal, what kind of filtration recommended. Any specialist vendors's names pls.
2) For the cooling tower water treatment (fresh water) what checmicals are used. Any specialist vendors?
3) For the cooling tower blower, any particular recommendation/ requirements for the blower?
4) Most importantly, what is the expected uniterrupted interval for twoer maintenance works. For e.g. can we expect to operate the tower uniterrupted for 5 years.
Thanks for your replies
Regards
We are in concept development stage of a cooling water tower (fresh water). I am of the opinion that a cooling tower with extended basin to incorporate vertical turbine pumps (about 5 nos of 10,000m3/hr ; 35mts head) would be better. Other view in our group is that perhaps Horizontal pumps would be better because one could avoid the cost associated with Civil/structure for the extended basin.
I am sure those invovlved with the cooling tower/ and associated eqpt selection would have extensively done cost/ convenience/ maintenance/ reliability analysis on vertical vs horzintal pumps selection and associated merits etc.
Request all members to throw ideas, based on their experience, which is a better option. I realize that there aint a yes/no answer to this. Any guidance would be useful.
1) For the basin sludge removal, what kind of filtration recommended. Any specialist vendors's names pls.
2) For the cooling tower water treatment (fresh water) what checmicals are used. Any specialist vendors?
3) For the cooling tower blower, any particular recommendation/ requirements for the blower?
4) Most importantly, what is the expected uniterrupted interval for twoer maintenance works. For e.g. can we expect to operate the tower uniterrupted for 5 years.
Thanks for your replies
Regards





RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
There are no provisions for sludge removal, other than draining the basin and using a small front end loader (Bobcat) to "dig" it out. The basins are often designed with what looks like a boat ramp to allow easy access for cleaning. About 15 years ago, we started sloping the (interior) bottom of the basin to allow the sludge to be more easily pushed to the low spot for removal - this has been well received by maintenance personnel.
Cooling towers have a hard life - the evaporation of water means that a lot of "crud" gets left behind - this tends to make the water corrosive, potentially attacking both reinforced concrete and steel. One year of operation (again, for an electric utility tower), without a maintenance outage would be good.
One company name for water treatment is "Nalco"
http://www.nalco.com/ASP/index.asp
www.SlideRuleEra.net
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
Naresuan University
Phitsanulok
Thailand
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
In my experience I have seen cooling towers taken out of service every two years for inspection and disinfection - I don't know if the disinfecition was a legal requirement to deal with potential for legionella.
Good luck
Irish Al
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
regards
John
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
Jet, thanks for useful info on the vendors and eqpt. What is the capacity of each pump. Is space not a constraint in your plant? I looked at pump catalogue; 6.5mx3.5mx2.5tms (LxWxH). With a side suction side disch. we would have 3.5 mts + suction run + discharge check valve + BV + bend: all this would translate to say 6 mts?. So, rought a 6mx6m is used up in front of the tower. Perhaps this may be ok. I will check.
Is it not true that for horizontal pumps one may have to lfit up the tower to create sufficient water level.
You have a 6 monthly clean? Does that mean that out of the 5 towers, one is a spare, so that you can schedule for maint of one tower while other 4 serve the plant?
JJPellin,
You said "But the cost of the pit will probably exceed the sump savings.." Can you please elaborate what is meant by this.
Regards
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)
RE: Vertical vs Horizontal pumps for cooling tower, and lotsa others :)