Ok, were you able to solve this problem?
The pipeline to be chlorinated is 6in diameter and 800 ft long.
The pipeline volume per foot is 3.14 x .25 x .25 x 1 ft x 7.48 gal/ft = 1.47 gallons/ft of pipeline
To disinfect the pipeline we want a 100 mg/L chlorine dosage in contact for 3 hours.
We want to finish the job in less than 8 hours so we will need a slug that is about 40% of the entire volume.
A 40% slug is 800 ft x .4 = 320 ft
The volume of the slug is 320 ft x 1.47 gallons/ft = 470 gallons
The withdrawal rate is 470 gallons/180 min = 2.6 gpm
The amount of 1% sodium hypochlorite needed to make 470 gallons of 100 mg/L solution is
470*100 = x*10000 or 4.7 gallons
Chlorinate the valves and hydrants with a calcium hypochlorite tablet each.
Did you get the correct answer?
Bill
Questions Link
SUBMIT YOUR QUESTION BY CLICKING THE LINK "comments" AT THE BOTTOM OF THE LATEST POST
Sunday, April 28, 2013
Friday, April 26, 2013
Pipeline disinfection by slug method
Pipeline Disinfection Slug Method Description
The slug method of pipeline disinfection requires that a section of new main is highly
chlorinated, then valves are operated and water is slowly removed from the end
of the main causing the “slug” of highly chlorinated water to move along the
newly installed pipeline.
As this slug passes tees, crosses, and hydrants, the adjacent valves are
operated to ensure the disinfection of all appurtenances and branches.
Example Calculation
Using
the slug method chlorinate a 800 ft length of 6 in diameter pipeline. There are 4 fire hydrants and two valves
located on the new section of pipeline.
The chlorination must be completed in less than 8 hours. A 1% sodium hypochlorite solution is used for
this procedure. How much is needed and
describe the process.
I'll give you a couple of days before I reveal the answer.
Bill
Thursday, April 25, 2013
Welcome water operators looking for help
This is a help site for water system operators, supervisors, or other drinking water system professionals looking for some help with your technical questions. I will try to answer your questions or direct you to resources for the information you are seeking.
This site is just getting started so please be patient. I am building the site so as time passes you will find more information.
Thanks for visiting and check back to see how the site has changed.
Bill Lauer
By the way, there is no fee for the information provided on this site. I'll do my best to give accurate, correct answers, but be advised that you must combine this information with local and site-specific circumstances and make your own decision regarding any actions. It is your responsibility to satisfy all regulatory requirements and for any actions you take.
This site is just getting started so please be patient. I am building the site so as time passes you will find more information.
Thanks for visiting and check back to see how the site has changed.
Bill Lauer
By the way, there is no fee for the information provided on this site. I'll do my best to give accurate, correct answers, but be advised that you must combine this information with local and site-specific circumstances and make your own decision regarding any actions. It is your responsibility to satisfy all regulatory requirements and for any actions you take.
Subscribe to:
Posts (Atom)