Does anyone know where I can locate a chart for metals to be used in wasterwater. In particular, I want a comparison of 304 versus 316 stainless. I'm look for properties such as corrosion & erosion charicteristic and alternate material. I've searched the internet and haven't found a site...
I have been asked to size a pump pit & pumps for a storm water retention pond. I have been dealing in pressure systems for so long that I've forgotten how to calculate gravity flow. How do I determine of the pumps be able to get inlet flow. The retention pond holds approximately 1.25 million...
Excuse my ignorance but I have a pump question. I have two suppliers of pumps requesting opposite bearings in the pumps. One is suggesting sleeve bearings and the other roller bearings. The pumps are split case horizontal pumps and will run at approximately 900 rpm with 350 hp motors. The...
Thanks. Since I started this, I have inspected 3-18" diameter castings for the bowls on vertical turbine pumps and have found pin holes and cracks. My experience shows pin holes can grow to large air pockets once machining starts. The cracks are poor foundry practices or other damage. My...
Thank metengr. The castings are noted as cast iron ASTM A278-Class 30; ductile iron ASTM At36 Grade 64-14-12, or ASTM A395; Cast Steel ASTM A27 Class 65-35 or A216 Grade WCB.
Stainless Steel impellers are ASTM A743 CA15.
AWWA was somewhat generic in their specification. I was hoping for...
I had posted the below in the Mechanical forum yesterday and have recieved no responses. Any help here?
I am reviewing specs for pump units for a water system. These are city water (potable water) and approx 50 mgd pumps. The casings are specified as DI or CI. Is there a quality standard for...
I am reviewing specs for pump units for a water system. These are city water (potable water) and approx 50 mgd pumps. The casings are specified as DI or CI. Is there a quality standard for porosity and integrity of the casing? This is not a critical application so I don't think that I can...
I am reviewing specs for pump units for a water system. These are city water (potable water) and approx 50 mgd pumps. The casings are specified as DI or CI. Is there a quality standard for porosity and integrity of the casing? This is not a critical application so I don't think that I can...
We have a developer that built an embankment that has failed. Near this embankment, we have a buried 48" pipeline. The line is welded steel carrying municipal water. The question I have been asked is when will the pipe fail due to erosion. I have performed a simple beam analysis using the...
RWF7437: I was thinking a plug would be more expensive that a gate but I will check that out.
CVG: The electical is set up for 900 hp pumps and I'm right on the edge of that. This a plant upgrade so the electrical is existing. I'm afraid any addition head on the system will push me over the...
I'm operating at about 30 psig with a mzximum around 100 psig. This is on a pipe discharg header so the pressure will remain in the 30 to 40 psig normaly.
The service is raw sewage so something like a butterfly is out of the question. I need something with a little more beef than a knife gate. Is there a suggestion on another cheaper valve that would work? This probably is a fabricated valve but I haven't had any luck finding a fabricator that...
