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  1. 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...
  2. 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...
  3. 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...
  4. amazing azza

    Controlled fill QC

    Starting on a new project. A small sugar cane processing plant in sunny Indonesia. We are scheduled to begin earthworks soon. Going to strip the vegetative layer (20 cm) and do a controlled fill with clay up to grade level for the main building. Total height of fill - 1 to 1.5m. I need help with...
  5. amazing azza

    practical advice on differential pressure gauge selection?

    Hi guys, trying to select a pair of diff pressure gauges to monitor - supply pressure at AHU fan, and - static pressure inside a clean room I am looking through the Dwyer offerings and even after eliminating the obvious misfits there are still too many choices and the difference between them...
  6. amazing azza

    crank case heater

    Friends, what is the purpose of the crank case heater exactly? Is it for keeping the oil less viscous in cold weather? Is there other purposes for it? When should it be run? The entire time compressor is off?
  7. amazing azza

    water hammer relief valve

    Friends, can a pressure-relief valve across the discharge and suction piping of a centrifugal pump set be used for water hammer relief? If so, what is the proper way of sizing it? Illustration:
  8. amazing azza

    Recommendations for actuating a 30 kW heater

    Friends, I have an in-duct electrical heater that is part of a dehumidification and cooling system. The cooling coil first brings the air temp down real low, to drop out as much water as possible, and the re-heater then brings it back up to a comfortable level. The AC would run at a fixed...
  9. amazing azza

    proper setup for measuring room pressure

    Friends, I would like to measure air pressure supplied to a clean room (food packaging) for the purposes of adjusting/monitoring ventilation supply fan intensity. The fan is grossly oversized, and the room materials are not particularly strong. One has to be very careful with setting it (via a...
  10. amazing azza

    Mystery pump case connection

    Hello friends, I was wondering, what is this connection on the case of a centrifugal pump intended for? Pressure sensor? Overheating probe?
  11. amazing azza

    Walk-in box control

    Hello friends, as may you know, the canonical method of controlling the compressor on a refrigeration system is by opening and closing the solenoid valve and letting the compressor trip the LP switch. On my system, I find that the pressure switch is making this strategy impossible. The switch is...
  12. amazing azza

    how to store opened BSE oil?

    Hello friends, I have a bit of leftover BSE32 oil. Minimum I could buy was 5L and this was still too much. So now I have some leftover expensive oil. The 5L cost about $200. It says on the bottle to use immediately and not to store. At this price, I can't quite bring myself to throw away the...
  13. amazing azza

    steam retort control

    Hello friends, I have a steam retort where the temperature sensing element is so short that it does not extend out of its bung. (Shell has a weld-on threaded bushing and thermometer screws into there). Now, I have a sneaking suspicion that this will measure the temperature of the shell more so...
  14. amazing azza

    what to do about repairs?

    Hello friends, I have a question about your experience with electronics and sensors with respect to repair? I am finding it very difficult to deal with this... While all are happy to sell, none offers any reasonable repair options. Timelines on the order of 6 months, costs on the order of...
  15. amazing azza

    liquid ring pump noise

    Hello friends, I would like to ask for a second opinion about a sanitary liquid ring pump. This is an Alfa Laval MR185S and it is used for CIP return applications. Compared to a centrifugal pump, it is very loud when it is pumping water. When the water is depleted, the volume is reduced...
  16. amazing azza

    Leak rate

    Hi friends, I've been spending time searching for leaks in my refrigerant lines. I am having a hard time finding some of them. I know there is a leak from nitrogen pressure testing, but I am failing to find it. Is there an acceptable threshold for leakage? If so, what is it? For example, I...
  17. amazing azza

    Determine amount of refrigerant for fresh outdoor unit

    Hello friends, I have a question about an outdoor unit. Usually amount of refrigerant to be weighed in for a new unit is specified on the nameplate, however, in my case it is not (blank). Tried contacting the distributor, but all he could say was fill until 65 psi, not more than 10 kg. Not very...
  18. amazing azza

    Refrigerant piping question

    Hello friends, We are about to start commissioning our HVAC system. However, I just noticed the following refrigerant piping connection that has been made at the outdoor/compressor unit. Will the U-pocket not accumulate an oil plug? (Refrigerant is R407C). Also, does the filter-drier need...
  19. amazing azza

    pressurized deaerator safety valve setting

    Hello friends, I have a pressurized deaerator. Operating pressure 0.2 barg, max allowable operating pressure 2 barg. All instruments and gauges are rated for max 1 barg. Feedwater pumps are also rated up to 120 C (~1 barg). What should the safety valve be set to? I am planning to set it to pop...
  20. amazing azza

    what could cause a pressure gauge to read low?

    Hello friends! I have a deaerator. It is fitted with a 0-1 barg analog dial gauge (wika, not sure of model right now). It is reading low. Digital sensor (4-20mA) reads ~0.22barg, consistent with thermometer reading 105-106 C. But the analog is reading ~0.12barg. What could be the cause? Analog...

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