First Mining Drc-Zambia Sep/Oct 2017 FMDRC-Zambia Sep Oct | Page 45
around the brake ring surface and getting into
·
POWDER COATED for PH range of
assurance for adequate coverage of water in
the upper seal. e lower seal has an enhanced 4.5-8.5. Designed for industrial dust windy conditions. Caution: if freezing
design due to changes in the geometry of the suppression. Dust mixes with water conditions are to occur then plan for a method
parts and a Te on impregnated spacer.
and forms a caustic paste on exterior to drain water from all above ground pipe, stand
of sprinkler. Polyester powder pipes and risers.
Big Gun material options coating increases life of sprinkler and e mining environment is notoriously unkind minimizes pitting corrosion. Coating Control valves for irrigation systems
to certain materials. It's important to make is in the ow path as well as on all Proper air and water control are essential to an
careful considerations to select the right exterior surfaces. Same construction efficient irrigation system. Improper hydraulic
sprinkler dependent on site water and as anodized Big Gun; a polyester design of your irrigation system can lead to
particulate chemistry. powder coating is then applied inside pressure uctuations and water hammer, which
and out to improve corrosion can damage pumps, break pipes, and decrease
resistance.
Nelson Big Gun material options include
ow efficiency. For a functional, efficient system
anodized, powder coated or stainless steel.
·
STANDARD for PH range of 4.5-8.5.
Big Gun is made from aluminum,
·
that you can depend on, install Nelson control
·
STAINLESS STEEL for PH range of
valves.
0-14. Designed for use with sodium
yellow and red brass, 18-8 stainless hydroxide, sulfuric acid and sodium steel, and engineering-grade plastics; cyanide solutions used in mining Series control valve directly beneath the Big
seals and o-rings are buna-nitrite heap leach and process waters. Big Gun. e Big Gun / valve combo incorporates
rubber. Gun is made from 316 series stainless automatic drains, which are very important.
steel; all plastics, o-rings, and seal Experience has shown us that corrosive water
ere are many bene ts to installing an 800
ANODIZED for PH range of 4.5-8.5. materials have been chosen to be becomes much more corrosive when it becomes
Designed for industrial dust c o mp at i b l e w i t h m i n i n g a n d stagnant (loses all oxygen). e automatic drain
suppression applications where industrial process uids.
allows the water to empty out of the Big Guns
mildly corrosive water remains
aer each operation.
infrequently stagnant in the Big Gun Mounting considerations during shutdown. All aluminum Mounting design must always consider thrust e Nelson 800 Series control valve has low
components have been class 1 brass force and drive arm action as well as wind friction loss. It also has a straight through
color anodized; anodizing adds a distortion. One basic spacing rule of thumb is to design which minimizes turbulence in the ow
thicker aluminum oxide layer than have 100% overlap of the spray pattern. For path. Angle or weir valves turn the water
occurs naturally. example a sprinkler that throws 100 (30.5m) through 90° even though the valve inlet and exit
radius would be spaced not more than 100 are in line. ese valves create turbulence in the
(30.5m) apart. Doing this will give some ow path which can reduce the radius of throw.
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Sep - Oct 2017
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