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  1. amazing azza

    deaerator, cold makeup, vacuum

    pierreick, as per above, not sure how much more water can be recirced, but at the current rates the simple mixer is sufficient, there is no issue there. If you bring the recycled water to the opposite side of the tray, the mixing efficiency suffers tremendously. Atmospheric heads use the dip...
  2. amazing azza

    deaerator, cold makeup, vacuum

    georgeverghese, no bubble caps, it's just round trays with smooth lips (I wonder if those would have been better off as a weir...) that overflow. This overflow-waterfall hits the deflector caps (the chimney caps as you called them) which directs the water into the lower tray. Yes, that's...
  3. amazing azza

    deaerator, cold makeup, vacuum

    Thanks for the meaningful replies, lets give it another shot. georgeverghese, yes, indeed, the curtain of water would appear to block the steam going up. It doesn't block it completely, since there is steam coming out of the vent. But it may be able to condense that steam enough to cause vacuum...
  4. amazing azza

    deaerator, cold makeup, vacuum

    Sigh. I didn't want to get into this, but here it goes. The manufacturer is currently bankrupt and out of business. The director is in jail for owing money to the government. This project was one of the last ones built before all of this went down. At the time of commissioning, the better...
  5. amazing azza

    deaerator, cold makeup, vacuum

    A bit of an update. After observing the unit over the past week I can say this: The key to avoiding vacuum is keeping the temperature in the top tray above 100 C. This is much more effectively achieved by recirculation rather than increasing steam flow through the dome inlet. The amount of heat...
  6. amazing azza

    deaerator, cold makeup, vacuum

    georgeverghese, Yes, indeed, on the prewarming. What bothers me is that I do not see a drop in pressure in the deaerator headspace. It appears that the vacuum is not being redistributed evenly through the steam space, but instead is localized to one particular location and it is difficult to...
  7. amazing azza

    deaerator, cold makeup, vacuum

    pierreick, The recirc water is combined with the cold makeup water in order to raise the temperature of the makeup. But the fact that vacuum happens with or without this mixing tells me that the mixing itself is probably not the culprit. hacksaw, thanks When I watch this vacuum hammer happen...
  8. amazing azza

    deaerator, cold makeup, vacuum

    Background. We have a deaerator, as shown in the diagram below. The dome features permanently mounted waterfall trays. The problem with it has been that it cannot receive cold make-up. Shortly after cold makeup water starts flowing, loud implosions are heard coming from the top of the dome, and...
  9. amazing azza

    slab load on pile caps

    hokie66, Wouldn't the slab load transmit though the thin strip of soil to the pile cap? Also, if the grade settles, at extreme case the slab would be supported at two points - the cap (via the soil strip) and somewhere along the settled grade?
  10. amazing azza

    slab load on pile caps

    Hi guys, a question... I have a piled foundation consisting of - pile sets, caps and a grade beam that goes around the perimeter. Inside the sandbox formed by the grade beam, sits the slab. The slab is to be entirely within the grade beam, thus imposing no vertical load on it. There are no...
  11. amazing azza

    Pile driving at the edge of the world

    Hi guys, we are continuing our sugar plant build in sunny Indonesia. We are about to begin work on laying the foundation. Foundation is going to be based on pre-cast, driven, concrete mini-piles. 2 rows of 10x3-pile, and 1 row of 10x2-pile (6m between pile packs lengthwise). Cone penetration...
  12. amazing azza

    Controlled fill QC

    BigH, yeah.. I tried. Sheeps foot is non-existent, not sure why, it'd be perfect for the fill most frequently used around here. Pneumatics are all owned by the government and they don't rent them out. Private asphalt layers use front/back smooth rollers. The smooth vibrating rollers are coming...
  13. amazing azza

    Controlled fill QC

    Thank you for the feedback Ron! How can one generally avoid the work in progress from being soaked by rain? Create a system of drainage ditches and a sump? Maybe cover area with polyethylene sheeting?
  14. amazing azza

    Controlled fill QC

    An update and a question. Stripped the vegetative layer with a dozer, then 30cm more using dozer + excavator. Placed the borrowed soil elsewhere on the property. Underneath removed material could observe traces of a previous fill with gravelly clay and some natural soft black silt. Proceeded to...
  15. amazing azza

    Controlled fill QC

    Yeah, that area has some nice beaches. I have to yet to explore there... I think I know this one
  16. amazing azza

    Controlled fill QC

    Found an excellent video on the subject: CEEN 341 - Lecture 6 In the video, he mentions that the compacting spec is, say, 95% modified proctor, +-3% moisture of optimal. Question: how does one control the moisture? Spray the area with water? Compact more/less such that the proctor peak is in...
  17. amazing azza

    Controlled fill QC

    fattdad, I think I understand. If you look at the graph below, let the black line be the multipoint lab proctor. The field sample is done, and is represented by the orange circle. The proctor curve then shifts along the ZAV line until it meets the field sample (orange curve). The new maximum dry...
  18. amazing azza

    Controlled fill QC

    So much great info. Thank you all! It took me a whole day to digest it :) fattdad, if I understand correctly, you are suggesting to do the lab proctor curve on the fill sample. Then, say, at the end of the day, do a single-point proctor measurement on-site, followed by some sand cones. Then...
  19. amazing azza

    Controlled fill QC

    BigH, thank you very much for the detailed info! I have never been to Dibya Puri, indeed it was before my time. But, I have been to Lawang Sewu (old Dutch railroad depo). I was instructed to only walk on a certain side of the stairs and to touch the railing, or else risk being haunted... What a...
  20. amazing azza

    Controlled fill QC

    Thank you guys for the replies. Well whadayaknow? We are in Semarang, very close to your old stomping ground :) BigH, if you have anyone you would recommend, I'd love a contact. For geotech, we have been going through the local university, but they are not very talkative. Its hard enough to...

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