Oversizing stand pipe

[scrapdaddy]

I read somewhere that if one has a 1" bulkhead that the standpipe should be upsized to a 1 &1/4 inch pipe for proper flow. Not sure how this would help. Any insite as to if this is correct???

 

[Brew12]

I read somewhere that if one has a 1" bulkhead that the standpipe should be upsized to a 1 &1/4 inch pipe for proper flow. Not sure how this would help. Any insite as to if this is correct???

This is correct in that it is the typical recommendation.

As to why? Let me quote dursostandpipes.com

To Oversize or Not to Oversize
With 1 inch and smaller bulkheads the standpipe's PVC diameter needs to be larger than the bulkhead to work correctly. I get a lot of e-mail questions on why this is. Honestly, I’m not sure. Typically if you use 1 inch PVC pipe on a 1 inch bulkhead you get poor results. (Some exceptions with smaller low flow tanks.) Take my word on it and use 1¼ inch PVC pipe. For large tanks with 1.5 inch bulkheads and large return pumps however, there does not seem to be any need to oversize the standpipe for larger bulkheads. Bulkheads 1.5 inches and larger can use PVC pipe & fittings that match the size of the bulkhead. (I consider tanks in the 350 gallon and up good candidates for 1.5 inch bulkheads).

 

[scrapdaddy]

This is correct in that it is the typical recommendation.

As to why? Let me quote dursostandpipes.com

To Oversize or Not to Oversize
With 1 inch and smaller bulkheads the standpipe's PVC diameter needs to be larger than the bulkhead to work correctly. I get a lot of e-mail questions on why this is. Honestly, I’m not sure. Typically if you use 1 inch PVC pipe on a 1 inch bulkhead you get poor results. (Some exceptions with smaller low flow tanks.) Take my word on it and use 1¼ inch PVC pipe. For large tanks with 1.5 inch bulkheads and large return pumps however, there does not seem to be any need to oversize the standpipe for larger bulkheads. Bulkheads 1.5 inches and larger can use PVC pipe & fittings that match the size of the bulkhead. (I consider tanks in the 350 gallon and up good candidates for 1.5 inch bulkheads).

Thanks, is that just for the durso ya think?? I am going with a stockman due to space issues in my overflow box. Who knows, but I guess it cant hur tho so back to the hardware store I go.

Thanks again for the response!

 

[Brew12]

Thanks, is that just for the durso ya think?? I am going with a stockman due to space issues in my overflow box. Who knows, but I guess it cant hur tho so back to the hardware store I go.

Thanks again for the response!

I do think it works the same. The only real difference between a Durso and a Stockman is how the water/air mix is controlled.