Is there any limitation or minimum length of Half bracelet Anode?
FYI, we have one calculation that shows 180 mm of the anode length. The thickness of the anode (Aluminium Alloy) is 55 mm for 24" pipeline OD + 5.5 mm AE coating.
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
Seems very very light weight.
If its not fresh water, something's wrong. Can you post your calcs?
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
It might be a bit short versus anode suppliers' standard anode sizes for 24-inch pipe. Try getting the designer to reiterate the design to fit your nominated supplier's standard half shell length if possible. It's only a short line and there is scope for optimisation of the design dependent upon what standard you use. For example, ISO 15589-2 will give you a lower coating breakdown factor. Conversely, it wouldn't allow the optimistic anode capacity at 40 deg C either. If you can buy standard, even if it's more alloy than you need, it may still work out cheaper. Try asking anode suppliers.
Actually the total pipeline length is about 50 km, only the first 2 km have spacing every 7 joints, the remaining spacing is every 10 joints with the same anode length. I think this spacing is already maximum, or is it possible to make the spacing become every 15 or 20 joints to make the anode dimension longer?
PLEASE READ the DNV code I gave you.,
SEE section 5.4.1, 5.6.1, 5.6.9
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
The answer should be in the applicable CP design standard! Anode spacing can be verified by an attenuation calculation. Take your pipeline design and the CP design standard and work through it. It's not so difficult.
Thanks Big Inch, actually our CP spec is still based on DNV RP B401 1993, and not yet using DNV RP F103. Quite old you know, but our Principal Eng still prefer this one, don't know why. Based on our spec also, the spacing is limited to 10 joints max, thats why we got such short anode.
I think I'll just give excess mass to the anode to get the minimum length that can be fabricated.
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)
hope you mean like, "in the sand", rather than someplace dark and dirty.
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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)