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  1. Camell

    Retaining wall: critical section for flexural design

    Thanks guys The critical sections you mention, hokie66, are what I also normally use. The question arises from what the definitions in the BS 8110 code we are working to indicate. As I mentioned, the code specifically refers to the critical section in regards the base and refers one to normal...
  2. Camell

    Retaining wall: critical section for flexural design

    Been looking at the design codes for the design principle relating to the section where design should take place for flexure: While retaining walls are not specifically adressed, the following: Base: On the face of the column/wall Wall: considered to be a slab => use standard cantilever span...
  3. Camell

    Fixture units at 100% certainly of occurrance?

    I am designing an "outfall sewer" for a new mine. The main source of wastewater is the change house with a total no of fixture units of 484 (29 WC-pans, 52 WHB's, 36 Urinals, 49 Shower, 10 Wash machine, 8 Wash Trough) The way I understand the fixture unit design method is that it is based on...
  4. Camell

    Pump plinths

    Thanks, John At this stage my concern is mainly the issue of rebar. From your descrpition, you are definitly in favour of a doweled connection to the RC floor. I am concerned, though, about placing rebar in the plinth itself as this may clash with the anchor bolts for the pump/motor bases. I...
  5. Camell

    Pump plinths

    We are currently installing new pumps in an old treatment plant where a completely new set up pumps (new duty and purpose) is required. The pumps are generally recycling and transfer pumps ( Qmax = 600m3/hr, so relativly small installation)The pumps are to be supplied with their own steel frame...
  6. Camell

    Check valve suitability

    Regarding the performance of check valves on raw water pipelines, various options exist. What are the advantages and disadvantages of the most common types: roller ball, swing, membrane, and spring disk? (I am not considering using control valves in my application) I am considerng using a...
  7. Camell

    Thust blocks and surge

    I though as much, so it will be reasonable to design the ancor blocks for the pipe bridge for the surge condition in the plastic pipe? Done the system curve calc ( to select pump properly) utilised k=0.03mm, k-0.015, k=0.06 as variables and it does not make much of a difference at the duty...
  8. Camell

    Thust blocks and surge

    Thanks. That is the pragmatic approach, and whe i am headed...looking at the individual components of the pipeline on their own merits By maximum flow, I assume you mean duty pont. Yes, this is the surge condition I would be interested in. With regard to the actual surge pressures: Without...
  9. Camell

    Thrust block and surge

    I am busy with the design of a pumped main. Regarding the design of thrust blocks: What is the accepted practice with respect to the pressure considered. I see three alternatives: 1) Normal duty point and flow 2) Pump maximum pressure (potentially zero flow, but not nessarily) 3) Surge...
  10. Camell

    Thrust block and surge

    I am busy with the design of a pumped main. Regarding the design of thrust blocks: What is the accepted practice with respect to the pressure considered. I see three alternatives: 1) Normal duty point and flow 2) Pump maximum pressure (potentially zero flow, but not nessarily) 3) Surge...
  11. Camell

    Thust blocks and surge

    I am busy with the design of a pumped main. Regarding the design of thrust blocks: What is the accepted practice with respect to the pressure considered. I see three alternatives: 1) Normal duty point and flow 2) Pump maximum pressure (potentially zero flow, but not nessarily) 3) Surge...

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