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  • Users: scythe13
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  1. scythe13

    Gaseous fire suppression system for electronics warehouse?

    I am involved in a project about choosing the best fire suppression system for an electronics warehouse The warehouse area is 1000 Sq M. and the maximum warehouse height is 7.3 M and it's normally occupied. Because the electronics devices stored in that warehouse are of high value, the client...
  2. scythe13

    Spacing of In-rack sprinklers?

    I am involved in a project to design sprinkler system for a warehouse. I have attached the layout of racks. The commodity class is I, II and III and the rack types are double-row without solid shelves. I know that to specify the in-rack sprinkler arrangement I can use Table 16.3.1.1 (from...
  3. scythe13

    Using ireducing elbow 1x1/2 nstead of elbow 1" + reducing coupling 1x1/2 in sprinkler system

    Hi, I am involved in a sprinkler installation project. Currently we are installing sprinklers in the rooms, the pipes size is 1" and the sprinklers are installed above false ceilings, however the client wants the false ceiling height to be as low as possible. As far as I know, to attach a...
  4. scythe13

    HVAC system selection

    Hi, I am working on a project to evaluate the HVAC system for a 21 storey residential building. I have attached a typical floor plan which involves Fan Coils layout. As you can see there are no mechanical ventilation system to furnish fresh air is considered. Do you think according to ASHRAE...
  5. scythe13

    The cost effective way for energy submetering?

    Hi, Because heat meters are so expensive, what are the alternative ways to calculate the energy consumption of fan coils? -consider the pipe distribution is horizontal, so by knowing the flow and supply and return temperature I can estimate the energy consumption. -The flow in fan coils are...
  6. scythe13

    Sizing sprinklers cross main

    Hi, I have attached a sprinkler layout from NFPA 13. Can you tell me why the size of cross main after 10 branches has changed from 2-1/2" to 3"? I think in hydraulic calculation, the criteria in sizing main branch is keeping the velocity and pressure in an appropriate range, so the number...
  7. scythe13

    Combined AHU and Fan Coil system for a zone?

    Hi, I have seen in some buildings for a zone there are fan coils as well as AHU system. My question is what percent each system (fan coil and AHU)shares the cooling/heating load of the zone. How do you size fan coil and AHU? Thanks
  8. scythe13

    False Ceiling installation to use ESFR sprinklers?

    Hi, I am performing a basic design for a warehouse (with sloped roof), the dimensions are as follows: Ware House Dimension – Length and Width: 120m x 80m Apex. Height: 19 m Eave Height: 14 m Height Of racks: 12m Type of Racks: 3 rows, the racks are open As it's clear because of ceiling...
  9. scythe13

    Silencer Location? Before or After Fan

    Hi, What are the parameters to select silencer location (before or after fan)? For a commercial building project, there are several AHUs and as I have provided in the attached drawings in some AHUs, silencer is located before the fans and in the other cases it's located after the fans...Can...
  10. scythe13

    What's UL Listed Pressure?

    I'm looking over a fire pump catalog. There is a column that e.g. for a 300 gpm fire pump shows "87-139" UL Listed Pressure (PSI). Do you know what is 87-139? Hereunder is the link for the datasheet: http://www.naffco.com/product.php?prod_id=600&groups_id=252
  11. scythe13

    Pump selection for a hydrant system?

    hi, I'm trying to select a pump for the hydrant valves of a warehouse. The warehouse is 170m x 114m x 14m, and the fire area is 208600 square feet. Presumably, it's Type I construction, and by using "TABLE A-III-A-1", the fire flow equals 5000gpm. Because the area is fully sprinkler protected...
  12. scythe13

    How to determine number of alarm check valves?

    For a warehouse with the dimensions of 170mx117mx12m, a wet pipe sprinkler system must be provided. In NFPA-13, section 5-2 states maximum floor area for a storage to be protected by one sprinkler riser shall be 3716m2 So, in this warehouse at least 6 risers must be installed: floor area...
  13. scythe13

    How to calculate the flow requirement of an ESFR system?

    I have chosen ESFR-25 sprinklers for a warehouse, and I considered the number of activated sprinklers to be 12, and the min gpm of each sprinkler to be 158. So, the required flow is 12x158=1896 gpm So, can I choose a 2000 gpm pump? And what's more, is it a good idea to propose two pumps, one...
  14. scythe13

    How to zone area for fire sprinkler layout?

    There is a warehouse (170mx117m x 12m) with class I goods. I want to know how to zone the area? And also to calculate the required fire pump flow, Do I must consider the pipe volume of whole zones or each zone separately?

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