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  1. Sahkah

    Oil fired condensing boilers

    Hello, Are there a reliable oil-fired condensing boilers out there in the market, whether in Canada or the US? The boiler will be installed to serve an office building; its capacity will be around 150 kW. What are the advantages and disadvantages of such type of boilers? Appreciate your help...
  2. Sahkah

    Testing small diameter plumbing piping

    Thank you all for your responses! The pipe material is copper, it is 45 yrs old and leaking at different locations. No definite reason behind the leaking except aging.
  3. Sahkah

    Testing small diameter plumbing piping

    Hello, would like to ask what would be the best test to evaluate pipe thickness and conditions for small diameter plumbing piping, i.e. 1.25" and smaller? I know that ultrasonic testing is usually used but read that it might not be reliable for small pipe sizes? Can you please advise? Thanks!
  4. Sahkah

    Protecting Variable speed pumps with low flow by-pass line

    Thank you all for your inputs .
  5. Sahkah

    Protecting Variable speed pumps with low flow by-pass line

    Hello experts, Couple of constant speed pumps ,used in a heating system, are being replaced with new VFD pumps and so are the accompanied three-way valves converted into 2 way valves; my question is, is the existing low flow by-pass line need to be kept to protect the new pumps from critical low...
  6. Sahkah

    Chemical feed pot installation

    please how to tell whether open or closed?
  7. Sahkah

    Chemical feed pot installation

    Hello, Where would a chemical feeding pot be installed on the main water entrance line to the building: downstream or upstream the meter ? Thank you[glasses]
  8. Sahkah

    Converting Glycol hydronic system into water system

    Good day, Wanted your help in identifying the consequences of converting a heating system from using glycol (35%Ethylene glycol mix) as a working fluid into using water . The old system (using glycol) used to incorporate a steam/glycol heat exchanger , pumps ,the piping distribution system and...
  9. Sahkah

    Chiller leaking refrigerant

    Thanks for your help[thumbsup2]
  10. Sahkah

    Chiller leaking refrigerant

    The chiller has been already decommissioned and no longer in use . My questions, as per my above post, are about the general thoughts of what caused such a release , ways of avoiding leakages/releases in chillers and, understanding how would the refrigerant get saturated in the chiller oil...
  11. Sahkah

    Chiller leaking refrigerant

    Hello, In an office building , my company manages , a water cooled chiller has totally leaked ~250 kg of refrigerant (R134A)over its years of installation despite annual maintenance; what are your general thoughts of what caused such a big refrigerant loss and what would be the best approach...
  12. Sahkah

    VFD pumps control in hydronic system

    Hello, for a hydronic system consisting of two condensing boilers , of dual return, utilizing variable speed pumping primary and secondary circuits , what would control the pumps speed whether on the primary or the secondary circuits? also would it be more efficient for the systems to have the...
  13. Sahkah

    The requirement for standpipe and a fire pump for a 3 storey office building

    Hello, I appreciate your help on the following issue regarding the requirement for a booster fire pump and/or a standpipe. The building , built in the seventies in Toronto , Canada , is an office building , 3 storey and a basement (group D by the NBC) , it has both the basement and first floor...
  14. Sahkah

    Cooling tower exhaust separation distance from intake air

    Hello all, Appreciate your advise on avoiding air intake contamination from a nearby cooling tower exhaust. The intake , combined with exhaust, air louver for a building mechanical room is located within 10 m of the cooling tower exhaust (located on the roof). What would be your recommendation...
  15. Sahkah

    Steam control valve sizing

    Hello all , For a steam/50% glycol heat exchanger , the steam inlet to the heat exchanger is divided into two inlet lines : one line @1/3 of the total capacity and the other line is @ 2/3 of the total capacity . The total capacity of the heat exchanger is 10,531,300 btu/hr (10531.3 MBH) and the...

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