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  1. sider

    Threaded Flange on 6" Pipe

    Hi all, we have a project requirement for screwed flange on 6" piping. How usual is this solution and what problems can be expected? The pipe will be located 3 m above the ground. The current issue I foresee is that during the screwing of the flange, it would be hard to match the hole's...
  2. sider

    High hydraulic separator inlet velocities

    Hi all, would need some advice on the low-loss header application. Currently, I am designing a chilled water test ramp with rented equipment. The chilled water system will be with the primary-secondary pumping arrangement. When the load comes online, I have sufficient liters of water as per the...
  3. sider

    Rate of absolute humidity increase in space

    Hi all, I could use some advice regarding the issue of increased humidity in the building. I am currently on a project that is being built with a dew point of the outside air of 23.2°C (x=18g/kg). The space is cooled by the perimeter CRAC units which also have to cool and dehumidify outside air...
  4. sider

    Draining of heat exhanger

    In one of the CHW projects, I had to deal with a cooling unit heat exchanger whose IN/OUT connections were located in the middle of its overall height. After the hydro test, the heat exchanger could not be drained properly, as shown in the picture, as the lower part of it would be flooded since...
  5. sider

    Galvanizing piping after welding

    We have a requirement from the customer to install a chilled water system with galvanized steel, and such that we first have to weld and connect steel piping and after the hot works have been done, dismantle the piping and take it for galvanization, after which the installation should be...
  6. sider

    Lithium Ion Batteries Exhaust Ventilation

    Does anybody have experience with the design of exhaust ventilation for off-gas event for lithium-ion batteries? I have a few questions regarding FM Loss Prevention Data Sheets and NFPA 855. 1. In NFPA 855 4.9.3, the mechanical ventilation rate is defined to be not less than 5.1 l/s/m2. Could...
  7. sider

    Off-Gas Mechanical Ventilation for Lithium-Ion Batteries

    Does anybody have experience with the design of exhaust ventilation for off-gas event for lithium-ion batteries? I have a few questions regarding FM Loss Prevention Data Sheets and NFPA 855. 1. In NFPA 855 4.9.3, the mechanical ventilation rate is defined to be not less than 5.1 l/s/m2. Could...
  8. sider

    Refrigeration fittings applicable Standards

    Is there any standard in Europe/America that could be applied to copper fittings, particularly bends for refrigeration purposes? From my understanding there is EN 12 735-1 for hard drawn rounds of copper piping I am using when defining requirements for new constructions, however, I couldn't...
  9. sider

    How to stop piping corrosion

    Hi all, I work in the modular construction industry, where we sometimes have a chilled water system incorporated into the design. Before construction, we treat the piping with a corrosion inhibitor which is water soluble. There was a requirement by a customer to do the flushing of piping before...
  10. sider

    Calculation of Hold Time for Novec

    Novec when released has an effect in confined spaces in terms of overpressure and underpressure which is resolved with pressure relief dampers (which open on certain pressure in both negative and positive directions and relieve the space from structural damage. I have a question how would you...
  11. sider

    Anchor points in piping

    Hi all, could use some advice on anchor point topic. From my understanding, when an expansion joint is installed in the piping system, it must be located between 2 anchor points ( we are talking about a straight line of CHW piping, 40 m long, the difference between installation and working...
  12. sider

    Flammable Gasses Detection

    Indirectly related to NFPA, could somebody give a little insight on how the first responders react to lithium battery storage fire and possible thermal runaway? If there is no deflagration venting and exhaust ventilation, and if the primary fire suppression system is a total flooding agent, how...
  13. sider

    VESDA/Smoke detector false alarm

    Hi all, I have a mechanical background and don't have much experience with fire detection. I hope somebody here could give some clarification regarding this issue. Is it possible or have you maybe encountered a situation that refrigerant discharge containing refrigerant and oil mixture that...
  14. sider

    Leak pressure testing EN 378-2

    Can somebody clarify a little setting of a pressure testing based on standard EN 378-2? So, currently the heat pump units (R410A) we need to test have HP switch set on 40 bars, and safety valve on 41,5 bar (+- 3% opening, so possibly it is opened on 40,2 and 42,7 bar respectively). We are...

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