Skip to content
Sand Dredge Operator (Spider No. 2)

Sand Dredge Operator (Spider No. 2)
3. Dredge Startup 4. Mining 5. Dredge Shutdown 6. End of shift Activities 7. Non-Routine Activities, Emergency/Unusual Situations
1. 3. Dredge Startup
Remove window guards
Enter operators compartment
Can remove life-jacket
Get in seat
Check diary/log
Check alarm/warnings Priority 2
take necessary action Priority 2
Start oil cooler pump
Start service water pump Priority 2
Start cutter pump
allow time delay during starting sequence to limit peak power demand
Do not start cutter if oil temperature is below 80 degrees
Check cutter system charge pressure Priority 2
Minimum 250 psi - maximum 400 psi
start system hydraulic pump and wait for normal starting pressure
allow time delay during starting sequence to limit peak power demand
start jet pump (if needed)
allow time delay during starting sequence to limit peak power demand
turn on controls
This activates the controls on operator's chair
check all instruments
log on to plant computer
lower ladder
swing dredge port to starboard to check cable slack
Failure to do this could get swing cables caught in cutter
turn cutter on (forward)
contact plant prior to pumping fresh water Priority 2
enable the dc drive
Check operation of maximizer Priority 2
Check indicator light on dash Priority 2
Check vacuum change Priority 2
Look for air bubbles Priority 2
throttle the underwater pump up to priming speed slowly Priority 2
Contact plant operator to tell them fresh water is coming Priority 2
throttle underwater pump up to operating speed
lower ladder to mining face
Notify plant operator that you are sending material Priority 2
2. 4. Mining
establish instrument baseline readings ON WATER (flow, vacuum and discharge pressure) Priority 2
Check cutter pressure
approximately 1500 psi
Check for vacuum Priority 2
should be above water vacuum
Check for discharge pressure Priority 2
above water base line
set auto flow control Priority 2
normally at 19
based on pipe size, density of material, pipe length, distance
start starboard swing winch
adjust swing speed to maximize cutter pressure, swing pressure or vacuum Priority 2
get to end of swing and change direction
adjust swing speed to maintain vacuum Priority 2
this is a clean up pass
may return quicker than mining pass
continuously monitor instruments Priority 3
get to the end of swing and stop
advance a few feet or lower ladder
refer to mine plan
repeat cycle
Inspect oil filter bypass gages Priority 2
Filtration return filter, ladder swing return filter, cutter return filter, cutter charge filter
maintain communications with plant personnel Priority 2
Lack of communication is a factor in a large number of injuries and fatalities
monitor plant computer (CSR) Priority 2
monitor production rate/flow Priority 2
Monitor TOTAL TONS PER HOUR Priority 2
Monitor concrete sand: tons per hour Priority 2
Monitor mason sand: tons per hour Priority 2
Monitor specialized sand: tons per hour Priority 2
monitor for proper operation of tanks Priority 2
clean cutter head as needed
a rise in vacuum without a rise in production would indicate a plugging condition (suction mouth)
use jet pump only when needed for the following conditions:
if you cannot maintain maximum vacuum
to help clean cutter
use water cannon on deck to cut the bank above water
Never operate if not needed (conserve energy costs)
water direction must be manually selected with switch on dash
3. 5. Dredge Shutdown
Swing dredge to port side of cut
raise ladder to fresh water
pump water to clear materials from pipeline (approximately 15 minutes)
Observe instruments for return to baseline readings
flow, vacuum and discharge pressure
notify plant operator dredge is shutting down Priority 2
throttle down underwater pump to zero
disable underwater pump
Shut cutter direction off
shut jet pump down
raise ladder to safety chain
tighten up swing cables
shut down system hydraulics
shut cutter hydraulic pump down
shut oil cooling pump off
turn off controls
log off of plant computer
Install window guards
Make necessary entries in diary/log
allow service water pump to continue operating
pump is left running to allow flushing of vacuum, depth and discharge sensors
Exit operators compartment
Wear life jacket and hard hat
4. 6. End of shift Activities
Begin on starboard side
Check for slip/trip hazards Priority 3
Check for icing in the winter months (use calcium/propane torch if necessary) Priority 3
Check all handrails Priority 2
loose cables
broken, bent uprights
openings are chained off
toe boards in place
Check service water pump and jet pump Priority 3
packing
suction
physical damage
U-bolts along the ladder
Check electrical room
Check air conditioning/heating system Priority 2
Check static oil tanks Priority 2
look at oil canisters mounted on ladder Priority 2
oil levels
color of oil
Check hydraulic room Priority 2
check for hydraulic leaks Priority 3
check hydraulic oil levels Priority 2
Use site glass
look for oil level between high and low marks
Add oil if needed
ISO 32 OR ISO 45 AS NEEDED
check filter indicator Priority 2
should be in the green with unit not running
drain water from air compressor tank Priority 2
visually examine pump motors for damage, missing bolts
visually inspect hydraulic hoses, valves Priority 2
Obtain grease gun
grease trunion pins (starboard and port) Priority 2
check keeper bolt Priority 2
grease packing gland and two bearings on service water pump Priority 2
grease two bearings on jet pump
Check stern winch
Check for leaks
Check wire rope for bird nesting Priority 2
Check winch mounting nuts/bolts
If loose, re-tighten or replace with Grade 5 or better nuts/bolts
Check and grease fair leads Priority 2
inspect port side deck
Check all handrails Priority 2
loose cables
broken, bent uprights
openings are chained off
toe boards in place
Check for slip/trip hazards Priority 3
grease upper ladder hoist sheave Priority 2
climb steps to ladder at bow of dredge Priority 2
Use 3-point contact Priority 2
travel down port side of ladder to cutter Priority 3
Use 3-point contact Priority 3
check oil lines for leaks Priority 2
check water lines for leaks and bulges Priority 2
check swing cables for broken wires and flattening
check for missing/loose nuts/bolts
check suction pipe for physical damage, nuts/bolts in place
check port-side swing block for wear
grease port side swing block Priority 2
Grease lower travel sheave block Priority 2
check cutter gear for leaks, loose/missing bolts Priority 2
check cutter tubes for leaks, loose/missing bolts Priority 2
travel back up starboard side of ladder
Use 3-point contact Priority 3
check starboard swing block for wear
grease starboard swing block Priority 2
check starboard swing cable for broken wires, flattening
Check suction pipe for physical damage, nuts/bolts in place Priority 2
inspect bolts on maximizer (loose, missing) Priority 2
Check lift chains and lifting eyes on hoist block (upper and lower) Priority 3
check sheaves for wear Priority 2
check for loose/bent connectors Priority 2
Check ladder winch
Check for leaks
Check wire rope Priority 3
Check winch mounting nuts/bolts Priority 3
If loose, re-tighten or replace with Grade 5 or better nuts/bolts
Check shackle dead end of cable Priority 3
check pin tightness/beckett Priority 3
Ensure clean out lid is in place and tight on suction side of dredge pump Priority 2
examine vacuum sensors for physical damage
flush vacuum and depth sensors Priority 2
open both valves Priority 2
ensure both valves are closed after flushing sensors Priority 2
examine underwater pump Priority 3
check for missing nuts/bolts Priority 3
check for oil leaks Priority 3
shaft seals
hose
drain plug
check for holes in pump shell Priority 3
check pump packing and adjust if necessary Priority 2
Check 90-degree elbow for wear/holes Priority 2
Check the spool piece behind the 90-degree elbow for wear/holes Priority 2
examine torque tubes Priority 2
check shim packs Priority 2
check taper locks Priority 2
check for paint wear Priority 2
check for water leaks and cracks Priority 3
check intermediate bearings and seals Priority 2
examine swing cable fair leads (port and starboard side) Priority 2
check for wear Priority 2
check for rotation Priority 2
grease swing cable fair leads until you have a show of grease Priority 2
Examine discharge pipe along the ladder Priority 2
Check for wear
Check for leaks Priority 2
Check for clamp bolts
Examine swing winches Priority 2
Check for leaks
Check wire rope for bird nesting Priority 2
Check winch mounting nuts/bolts
If loose, re-tighten or replace with Grade 5 or better nuts/bolts
Check Lufkin gear box Priority 2
Check for leaks Priority 2
Check coupling Priority 2
Check oil level Priority 2
oil should be visible in site glass
Should look like oil - not milk (milky color indicates water in oil)
Check mounting nuts/bolts Priority 2
Check manual temperature gage Priority 2
Check pressure gage
should be at zero
Check wiring on electronic temperature gage Priority 2
Check dc drive motor Priority 2
check mounting nuts/bolts Priority 2
If loose, re-tighten or replace with Grade 5 or better nuts/bolts
check temperature
should be warm at all times
check bolts in coupling between gear box and motor Priority 2
check for unusual odors (burnt smell) Priority 2
Check dc blower motor Priority 2
check mounting nuts/bolts
If loose, re-tighten or replace with Grade 5 or better nuts/bolts
Complete "dredge daily lubrication and maintenance report
fill out log book/diary for shift
shut service pump off
close all windows
lock all doors
Board the boat
no smoking on the boat
use 3-point contact Priority 3
pump off rain water
ensure oar/paddle is on boat
check fire extinguisher
when using small boat, return fire extinguisher to locker
5. 7. Non-Routine Activities, Emergency/Unusual Situations
Maintain communications with plant personnel (follow posted instructions for contacting company personnel and regulatory agencies) Priority 3
Be prepared to provide information such as who is injured, location of victim, hazards in the area, extent of injuries (provide location if call is placed to 911 from dredge phone, plant phone or cell)
NOTE: 2nd work boat to be used as a rescue vehicle if necessary
Medical and fire emergencies Priority 3
Call 911 Priority 3
Be prepared to provide information such as who is injured, location of victim, hazards in the area, extent of injuries (provide location if call is placed to 911 from dredge phone, plant phone or cell)
NOTE: 2nd work boat to be used as a rescue vehicle if necessary
Location of first aid supplies Priority 3
Located on dredge in the electrical room, at plants, office
Untitled
Weather conditions
Lightening
Run material at a lighter load
Stay in the operator's cab Priority 3
Shut down when/if instructed
Snow/icing
Wear PPE Priority 3
Maintain 3-point contact Priority 3
Clear decks
Man overboard Priority 3
Know the location of the life preserver Priority 3
Throw the preserver to the victim Priority 3
Plugged discharge line (when in full production load) Priority 3
Caused by sloughing of material, cave-in
Raise ladder up to pump fresh water Priority 3
These steps will unplug the discharge 90% of the time
Speed dredge pump up to maximum rpm's Priority 3
Open up maximizer valve Priority 3
Observe instruments (discharge pressure, vacuum gage, and flow rate) Priority 3
Feel for cavitations Priority 3
Look for drop in tail line pressure Priority 3
Look for increase in flow rate Priority 3
Contact supervisor if plugged line persists Priority 3
Plugged discharge line (Power Failure or any interruption in the dredging process) Priority 3
Could be a rupture in the pipe line
These steps will unplug the discharge 90% of the time
Wait for power to come back on Priority 3
Restart dredge Priority 3
Rise ladder to fresh water Priority 3
Slowly increase underwater pump rpm Priority 3
Maintain a lower rpm Priority 3
Maintain discharge pressure at 30 psi Priority 3
Check flow gage for increase Priority 3
If you observe an increase in flow gage, bring rpm's up slowly to increase pressure/flow Priority 3
Repeat until line is clear Priority 3