traps and shall drain toward tank. Where steel piping is to be anchored,
weld pipe to structural steel member of anchor and patch abraded areas with
protective coating or covering as specified. Fit piping passing through
concrete or masonry construction with sleeves. Each sleeve shall be of
sufficient length to pass through entire thickness of associated structural
member and large enough to provide a minimum clear distance of 15 mm l/2
inch between pipe and sleeve, except where otherwise indicated. Sleeves
through concrete may be 20-gage metal, fiber, or other approved material.
Sleeves shall be located on center with piping and fastened in place.
Space between sleeves and pipe shall be calked and filled with bituminous
plastic cement or mechanical calking units designed for such use.
3.2.2
Installing Dispenser
Install on raised concrete foundation and protect against collision damage.
Provide opening in island for product and electrical risers for each
dispenser. Fill island riser holes with clean sand. Install dispensers in
accordance with manufacturers' instructions and with emergency shut-off
valve breaking point level with island surface.
3.3
PROTECTIVE COATING FOR UNDERGROUND STEEL PIPE
Apply protective coating to valves, fittings, and joints not factory
coated. Piping installed in valve boxes or manholes shall also receive
specified protective coating. Coatings shall consist of thermoplastic
resin conforming to FS L-C-530. Apply pipe joint coatings, valve coatings,
and field repair material as recommended by manufacturer. Finished
thickness of pipe coating system shall be as indicated in TABLE I with a
five percent allowable tolerance.
TABLE I
(Thickness of Coating)
Outside diameter of pipe
Thickness in mm
(mm)
(minimum)
15 to 40
0.5842
40 to 73.15
0.6858
7316.114.30
0.8128
over 114.30
0.9144
TABLE I
(Thickness of Coating)
Outside diameter of pipe
Thickness in mils
(inches)
(minimum)
0.50
to 1.50
23
1.50
to 2.88
27
2.89
to 4.50
32
over
4.50
36
3.3.1
Inspection of Pipe Coatings
Repair damage to protective covering during transit and handling before
installation. After applying field coating and wrapping inspect entire
pipe by an electric holiday detector with impressed current in accordance
with NACE RP0274 using full-ring, spring-type coil electrode. Equip
holiday detector with a bell, buzzer, or other type of audible signal which
sounds when holiday is detected. Repair holidays in protective covering
immediately upon detection. Occasional checks of holiday detector
SECTION 15193N
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