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Thank you all for your input. While we believe that the existing welded steel piping may last another 20-30 years we have decided to go with new D.I.P. that should last 40-50 years. Thanks again!

We can shutdown for days but get risky if forecast weather changes. Pumping rate is around 14 MGD. Header is around 50 feet with 4 pump connections. Cured in place liner not an option as it has a couple 90 bends with limited access. Thanks for your post.

Steel header has butt welds and assumed carbon steel. Thanks for your replies.

Thank you for your replies!

Thank you rconnor for your post. A great idea to try and visually inspect for any existing lining, my operations may not think though - I will suggest it. I agree with you that the future life of this could be quite long and may be worth it as it will provide an estimate $200k savings on the...

We are currently working on rehabilitation of a wastewater pumping station by placing 30 years olds pumps and other upgrades. Existing 24" steel piping header, also 30 years old, has a current wall thickness of over 1/2". The wastewater is typical residential wastewater at 60 degrees with a...

I do not know if there was a interior coating previously installed on the piping. I have talked with several contractors noting the old steel piping was not interiorly coated. I want to confirm with the engineering community along with any other suggestions. Thanks

Sorry, the wastewater is typical residential wastewater at 60 degrees with a maximum operating pressure of 40 psi and velocity of 6 ft/sec. We do not have any original pipe design or pipe information. Were older steel piping interior coated as I,m not sure a comparison would work if coating...

We are currently working on rehabilitation of a wastewater pumping station by placing 30 years olds pumps and other upgrades. Existing 24" steel piping header, also 30 years old, has a current wall thickness of over 1/2". We would prefer to leave the header and not replace it due to operation...

Thanks for your response Bob. I am in total agreement with your reply. Can anybody else provide their input or any documentation requiring a second sample without another flush? Thanks Jim

I am trying to find documentation/clarification on bacteriological testing requirements. According to AWWA Standards, C651-99, Section 5.1, two consecutive setsof acceptable bacteriological samples are required. I am trying to clarify the requirements on the second day samples. It is my...