2006 New York Code - Sources Of Water Supply For Sprinkler Systems.

 
    §  27-962  Sources  of  water  supply for sprinkler systems. Sprinkler
  systems shall be provided with water from the following sources. (a) Two
  automatic sources of water supply shall be provided for sprinklers in:
    (1) Buildings classified in occupancy group A.
    (2) Buildings classified in occupancy group C when  the  area  on  one
  floor exceeds twenty thousand square feet.
    (3)  Buildings  classified in occupancy group F-1a when open heads are
  required for stages of unlimited size.
    (b) At least one automatic source of water supply  shall  be  provided
  for sprinklers installed in all occupancy groups, except those listed in
  subdivision  (a)  and  except  as  provided  in  subdivision (c) of this
  section.
    (c) The domestic water supply may be used  to  supply  any  sprinklers
  required  under  section  27-954  of  this  article  when  installed  in
  buildings classified in occupancy groups E, G, H and J, or to supply any
  sprinklers required under subdivision (aa) of said  section,  regardless
  of  occupancy  group  classification, provided that all the requirements
  stated in subdivision e of section 27-962 of this article are met.
    (d) The  domestic  water  supply  may  be  used  to  supply  water  to
  sprinklers  in cooling towers if provision is made to automatically stop
  the use of water through the domestic supply lines and provided that all
  of the requirements stated in subdivision (e) of this section are met.
    (e) When the domestic water is used to supply sprinklers as  permitted
  in  subdivisions  (c)  and  (d)  of  this  section, all of the following
  conditions shall be met:
    (1) The domestic water supply line from the tank or street  supply  is
  at  least the size of the sprinkler line and that the capacity available
  is at least equal to the capacity required for the sprinklers.
    (2) The domestic water supply line from the tank  or  street  has  the
  required pressure as provided in section 27-963 of this article.
    (3)  The  domestic  water supply line is of nonferrous material except
  when the domestic water supply is four inches or over.
    (4)  An  o.s.  and  y.  valve  or  an  approved  valve  having  visual
  indication, sealed open, is installed in the sprinkler supply branch, or
  such  other  valve  arrangement  as  may  be  provided  for in reference
  standard RS 17-2A or RS 17-2B, as applicable.
    (5) The pipe connecting the domestic water supply  and  the  sprinkler
  control  valve is of nonferrous material and not less than twelve inches
  long.
    (6) The number of heads in each fire section does not  exceed  twenty,
  except  that  the number of heads in each fire section may exceed twenty
  in buildings classified in occupancy group J-2 or J-3 not exceeding  six
  stories  or  seventy-five  feet  in  height  and in spaces classified in
  occupancy group J-2 or J-3 in buildings not  exceeding  six  stories  or
  seventy-five  feet  in  height,  and no more than ten heads are supplied
  from any one domestic water riser.
    (7) The connection is made at the supply or riser side of any domestic
  branch control valves.
    (8) In connection with  the  above  conditions,  the  number  of  fire
  sections  having  twenty  or  less  heads  may  be  unlimited;  and  the
  installation of alarms in branches supplying fire sections shall  be  at
  the option of the owner, except that such alarms shall be provided where
  required by reference standard RS 17-2A or RS 17-2B.
    (9) A check valve is installed on the sprinkler supply branch.
    (f) Nonautomatic sprinkler systems shall be provided with:
    (1)  Siamese  connections in accordance with section 27-940 of article
  three of this subchapter.
    (2) Malleable iron fittings approved for sprinkler installations.


    (3) An approved automatic fire  alarm  with  direct  connection  to  a
  central  station  of  an  approved operating fire alarm company shall be
  installed in the area protected by the sprinkler system.
    (g)  There  shall  be  no more than ten sprinkler heads connected to a
  plumbing riser supplying anything other than  sprinkler  heads,  and  no
  more  than  twenty  sprinkler  heads connected to a riser supplying only
  sprinkler heads in any fire section separated  by  two  hour  enclosures
  from adjoining fire sections. The number of sprinkler heads connected to
  a  riser  supplying  only sprinkler heads may exceed twenty in buildings
  classified in occupancy group J-2 or J-3 that do not exceed six  stories
  or  seventy-five  feet in height and in residential spaces classified in
  occupancy group J-2 or J-3 in buildings not  exceeding  six  stories  or
  seventy-five feet in height.
    (h) Standpipe risers may be used to supply water to sprinklers in high
  rise  buildings  classified  in  occupancy  groups  E, G, H and J and in
  existing office buildings, one  hundred  feet  or  more  in  height,  in
  accordance  with  applicable provisions of this subchapter and reference
  standards RS 17-1 and RS 17-2.
    (i) The domestic water supply in  buildings  classified  in  occupancy
  group  J-1  or  J-2  may  be used for sprinklers in corridors, in refuse
  chutes and in other similar areas, as approved by the commissioner.  The
  domestic  water  may  be  supplied  by direct public water connection or
  equipment and  pumps  approved  for  water  supply  in  accordance  with
  reference standard RS-16.