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  1. Vusal Quliyev

    Hydronic System - Routing - Prevent Air Trap

    Dear HVAC Experts, As you know there are some rules about hydronic heating systems routing(i.e. Fan Coil Unit system) in order to prevent air trap in the system which will lead heating capacity reduction. I prepared one example and need your thought about this situation: - High rise building. -...
  2. Vusal Quliyev

    AHU selection report with psychrometric

    Dear HVAC Experts, Do you know any software to prepare report with Psychrometric chart for the AHU unit selected based on our requirements. - Cooling Coil + Reheat Coil (Dehumidifing) - Heat Recovery Preheat + DX Heating - Mixing AHU with Cooling - Heating AHU with Humidifier Thanks for...
  3. Vusal Quliyev

    PICV as On Off valve - FCU valve

    Dear experts, I was wondering about mechanical charecteristics (Q and deltaP) of picv valve at low deltaP situations (below min deltaP requirment of picv.) As you know at datasheets it is talking about deltaP over 10kPa only, however i was wonderful what will hapen if we provide 5kPa for...
  4. Vusal Quliyev

    Noncomformity between NFPA and Sprinkler Catalogue

    Dear Experts, I am confused about maximum coverage distance of sidewall sprinkler when we put two sidewall sprinkler at the opposite walls(throw): - As per NFPA section 8.9 and 8.7 maximum throw distance of single extended coverage sidewall sprinkler is 4.3 m (see photo below) - at the...
  5. Vusal Quliyev

    Seismic Expansion Joint for Branch FF Pipes

    Dear Experts, I was wondered if there is any requirement about minimum / maximum which size of branch pipe it is required to apply seismic expansion joint at the dilatation part of buildings. Is there any reference about this topic in the NFPA? [dazed] Thanks.
  6. Vusal Quliyev

    Boiler Room at basement

    Dear Experts, I was wondering if there is any restriction to put boiler room at the basement level. (below grade) Boilers are natural gas type. There is mall located at above levels. Please refer international standards: IBC, NFPA or similar.
  7. Vusal Quliyev

    Duct Construction Standard - Pressure over 2500 Pa (10 inch Wg)

    Dear Experts, As you know SMACNA gives recommendation about construction standards only for upto 2500 Pa (10 inc Wg). It is really strange that there is no any information about Duct construction standard with the static pressure over 2500 Pa (10 inch Wg). And i search internet and could not...
  8. Vusal Quliyev

    Pressure for Class III Stand Pipe - NFPA

    Dear Experts, there is big confusing at the NFPA 14 to understand. It is stated that for Class I: maximum allowed pressure - 175 psi (12.1 bar) minimum allowed pressure - 100 psi (6.9 bar) It is stated that for Class II: maximum allowed pressure - 100 psi (6.9 bar) minimum allowed pressure -...
  9. Vusal Quliyev

    NFPA / IBC Requirement - Fusible Link Fire Damper

    Dear Experts, I was wondering about NFPA and IBC requirement about Fire Dampers. Please consider inputs as: - Building is High Rise Building - There is Stairwell Pressurization considered. - No any smoke exhaust considered at Fire zone. - There are 2 Ventilation shaft one for exhaust and one...
  10. Vusal Quliyev

    Fire Pump sizing

    Dear Experts, There is confusing topic about NFPA 14 and NFPA 20 to discuss with you: If we have Fire Pump serving to header and this header serves to Class I stand pipe system, Class II stand Pipe System and Sprinkler system. (3 pipe coming from pump room). Can we consider this system as...
  11. Vusal Quliyev

    Vent Pipe at Kitchen Drainage

    Dear Experts, we have 4 commercial kitchen located near to each other. My question is, what is international standards requirement (IPC or equivalent) for venting systems at kitchen drainages. I mean do we need to add vent pipe for kitchen drain if there is no any water closet connected to...
  12. Vusal Quliyev

    Smoke Exhaust Rate at corridor for High Rise Building - Residence

    Dear Friend, I received one high rise Residence project to check. There is stairway pressurization system and corridor exhaust system applied by designer. There is lift lobby located between corridor and stairway. No any pressurization considered at lobby. Building consist of 33 level and...
  13. Vusal Quliyev

    NFPA Wet alarm valve and Riser Check Valve

    Dear Experts, I was looking for standard at NFPA about when to use Wet Alarm Valve and Riser Check Valve. When we need to use Wet Alarm Valve and when we can use Riser Check Valve and we can use none of them. Thanks.
  14. Vusal Quliyev

    Smoke exhaust at Mall with 15 m height (NFPA and ASHRAE)

    Dear FF experts, I am searching standard for Smoke Exhaust at Mall with just 15 m height. There are just 3 levels in the project. Is NFPA or ASHRAE states that Smoke exhaust is necessary at corridors? Please help. Thanks.

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