minimum design & construction standards - Martin County, Florida

Joints for ductile iron pipe shall conform to the latest standard of ANSI/AWWA C111/A21.11
for rubber gasket joints and ANSI/AWWA C115/A21.15 for threaded flanges.
Cement-lined ductile iron pipe shall conform to the latest standards of ANSI/AWWA
C104/A21.4
DIP shall be required in the following circumstances:
a) Water main 24 inches in diameter and larger.
b) Within 10 feet horizontally of sewage facilities or pipes.
c) Within 15 feet of buildings, canals or lakes.
d) Crossings under sewage or storm pipes in accordance with Item 4
of this Section.
e) Crossings over sewage or storm pipes in accordance with Item 4
of this Section.
f) Carrier pipe for jack and bores (restrained joints).
g) Aerial crossings.
h) DIP may be mandated by the Department in any instance of off-site or on-site
construction where future abuse to the line is possible due to location or
circumstances, extensive length under pavement, or in private property away
from County rights-of-way.
7. Water Main - Size
The Water Main (WM) shall be sized by the Developer's Engineer as required and as
approved by the Department. The minimum size of WM shall normally be six (6”) inches.
Four inch (4") mains may be proposed for non-fire lines serving discrete areas where
additional development will not occur (i.e. cul-de-sacs). The Engineer may be required to
demonstrate the adequacy of such sizing.
Where fire flow is provided, all fire hydrants shall be placed on 8 inch (8”) minimum sized
water mains or 6 inch (6”) minimum sized water mains where the mains are looped.
Delivered flows should meet maximum day plus fire flow requirements as mandated by the
County and Florida D.E.P. The residual pressure under fire flow conditions shall not be
less than 20 psi.
8. Valves and Fittings
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