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  1. SteveWag

    Grit pumping

    The vertical loop, vented at the top, presents a constant head situation to the pump. The vent at the top can just be an upended tee. Grit pumps are normally open or recessed impellor pumps. and they work best if there is some minimum head available. Steve
  2. SteveWag

    Intrinsic barrier and wiring separation

    I have designed sewerage pumping facilities, and constructed and installed pump/level systems for 40+ years. Everything but the pump POWER cables cables should be intrinsically safe.Cable seals are a pain both to install and to deal with during maintenance. IS barriers and downstream wiring...
  3. SteveWag

    Sizing a booster pump for gas chlorination

    Sorry about being so late. With vacuum "ejectors" it is not unusual to see 3 to 5 times the input pressure as the output. Be conservative about headloss in small piping, sometimes there are many more fittings that you expect. I have used mostly turbine pumps if I felt the calcs were trustworthy...
  4. SteveWag

    Miami Beach, Champlain Towers South apartment building collapse, Part 02

    Thanks "spinspecdrt", I had not noticed that. Steve
  5. SteveWag

    Miami Beach, Champlain Towers South apartment building collapse

    I see on sheet 96 of 336 (the mixed up plan sets) shows three area drains (referred to as “DD”, Deck Drains?) are indicated in the sloped area surrounding the pool. And the pool is a simple rectangle, no stairs shown. But on later sheets the drains don’t show. The 2018 report indicates that the...
  6. SteveWag

    C900 Pipe Burst

    I worked on an existing 4500 PVC foot sewer force main laid parallel (in the same trench) to a gravity sewer line. Very low pressure at the pump discharge. The line design (Plans) showed fittings around the gravity manholes. Very low pressure at the pump discharge. Failures were monthly, some...
  7. SteveWag

    SCH 80 PVC Blower supply line

    I have seen sunlight damaged PVC above the water line, and have always used metallic (preferably SS) until about 12-inches below the water level. For EQ tanks that are sometimes empty I used all SS. Steve
  8. SteveWag

    about coupling nuts

    The thread form is completely different. The thread form of a M20 bar is straight and Metric dimensioned while the FNPT is tapered and NPT threads are inch. As to diameters, well M20 is M20 while NPT, or pipe diameters, are wildly different. Steve
  9. SteveWag

    Air solubility in water

    Assuming that both ends are underwater and the apex of the syphon is not higher than about 23-25 feet above the source, put a line size tee with the side outlet facing upward at the high point, add about 1-foot of pipe with a cap. At the very top, connect a 3/8 or ½-inch hose leading to a small...
  10. SteveWag

    Propane Cylinder Orientation

    Depends on what you want, liquid or gas feed, and then how the tank is internally piped. 16.4 oz, vertical with the valve at the top. Steve
  11. SteveWag

    Gorman-Rupp S8D1-E275 in Series?

    With the second pump 100 feet higher than the first, and the check after the second, the pipe connecting the first to the second will contain a high vacuum. Two things come to mind, first, the need for a 2-3 inch vacuum/air valve prior to the second pump so as not to expose the pump body to a...
  12. SteveWag

    Gorman-Rupp S8D1-E275 in Series?

    Do not fall into the trap of locating the second pump to far up the gradient, it should be well below, so that the first pump sees a lot of inlet pressure. I have started the low pump first and then after 5-10 sec., started the second. I have seen it done many ways, but I have only used one...
  13. SteveWag

    Gorman-Rupp S8D1-E275 in Series?

    Weird timing, as of 4:30 last evening I was handed a G-R drawing of two submersibles in series (two sets actually).They are sewage, 100 GPM at 95’ each pump or 100 GPM at 190’ per set. They are across the line starting, with one wet and one dry. They have been installed for 14 years and we have...
  14. SteveWag

    Queries on combination air valves

    The title suggests a “combination” air valve. These typically have a large float and a large vent, with the float rising (or falling) with water level. BUT, the large float may seal the large orifice and say there if air accumulates and the pressure is constant or higher. It is held shut by...
  15. SteveWag

    Cast Iron Specifications

    If you are working with Gray Cast made in the 1960’s it will be the same OD as todays AWWA specified Ductile Cast. If you were working with cast pipe made in the 1920’s then you may have pipe cast in a sand mold. For this you would measure the circumference and calculate the OD. You would then...
  16. SteveWag

    submersible pump and piping corrosion

    Most of my work is in central PA, much of it in the soft coal areas. I have encountered this situation many times. SS pump and plastic drop pipe solves the problem every time. 3-inch could be HDPE or better, grove-lock w/ set-screws PCV with SS adapters (CERTA-LOK® DROP PIPE). Steve
  17. SteveWag

    Fruits Waste Grinding/Pulverizing

    You said this is for a membrane reactor, I think. JWC has a 3 mm screen and a washer assembly that includes a grinder prior to the washer. I just started one last week and it works very very well on Domestic Sewage. The existing, NOT JWC, removes a tremendous amount of fecal material. (We...
  18. SteveWag

    Pipe/pumping question

    Google "small diameter variable grade sewer design" and read over the design guides. You are essentially carrying waste. Keep the velocity above 2.5 fps. There will be talk about “grinder pumps” you may (?) ignore the grinder aspect, your choice. BTW, depending upon individual flows, residential...
  19. SteveWag

    Pump Selection: low flow, high head, and highly abrasive

    Vertical mount? Use belt drives, alignment is a bitch. Steve
  20. SteveWag

    Pump Selection: low flow, high head, and highly abrasive

    Try; www.moyno.com and www.netzschusa.com/ Both positive and low shear, metering flow and very high head. Steve

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