# Presentation: 395985

## CURENT DREDGING INDUSTRY TECHNOLOGIES PERTAINING TO PIPELINE TRANSPORT

## METHODOLOGY

- The System of Principles, Practices, and Procedures Employed by a Discipline

## “WE” MEANS THE INDUSTRY

## BENEFICIAL USESOF DREDGED MATERIAL

- Coastal Restoration
- Wetland Creation
- Barrier Island Restoration
- Beach Nourishment
- Bird Island Development
- Maritime Forest/Chenier Ridge Development
- Sub-tidal Habitat Enhancement
- Development
- Roadway Base Creation
- Marinas/Residential Communities
- Industrial Waterside Facilities

## BENEFICIAL USES PLACEMENT

- Placement Modes
- Confined Placement
- Simi-confined placement
- Open Water Placement
- Placement Measures
- Use of Existing Emergent Land Features
- Earthen Dikes
- Rock Enclosures
- Geotubes
- Access Channels

## SOURCES OF MATERIAL IN COASTAL LOUISIANA

- Dedicated Borrow
- Mississippi River
- Offshore -  Gulf of Mexico
- Interior Bay/Lake Bottoms
- Channel Maintenance Materials

## DREDGED MATERIALS TYPES

- Consistency
- Sand
- Silt
- Clay
- Disposition
- Virgin Material
- Maintenance Material
- Dredge-ability
- Silts and Clays
- Unconsolidated – “Fluff”
- Consolidated – “True Bottom”
- Sands
- Loose
- Hard Packed

## SEDIMENT HANDLING LOGISTICS

- Ingress route planning/execution
- Materials single-handling
- Direct Pump Via Pipeline
- Pump Power-Boosters
- Pipeline Acquisition/Assembly/Maintenance
- Spread Material as Fill Advances
- Materials Re-handling
- Excavation / Stockpile
- Excavate and Deliver With Large Pipeline
- Excavate and Deliver With Hoppers
- Excavate and Deliver With Scows
- Re-Slurry and Discharge Into Final Area

## MECHANICAL GRAB

## HOPPER DREDGES

**HOPPER DREDGES**

## PIPELINE DREDGES

## PARTS OF THE PIPELINE SYSTEM

- Suction
- Pumps
- Pipeline

## SUCTION

- Dustpan
- Cutter < 75’
- Open Suction -  Deep Digging

## PUMPS

- Long Line = High PSI
- Large Discharge Diameter = High Horsepower

## PIPELINE

- Near the Dredge

## PIPELINE

- Fixed
- Access Canal
- Install
- Roll
- Wear

## PIPELINE 

- Near The Discharge
- Flexibility
- Plastic
- Spray

## Slide 18

## Slide 19

## Slide 20

## Slide 21

## PRODUCTION FACTORS

## GRAIN SIZE

- 200 Micron Sand – 15 fps

## PIPELINE DIAMETER

- Psi/Ft of Line
-  Head Loss/Foot of Line Goes Down as Pipeline Diameter Increases.
- 30” Pipe – 100%
- 24” Pipe – 129 %
- 36” Pipe – 81%
- Hp/Ft of Line
- Horsepower/Foot of Line Goes Up as Pipeline Diameter Increases.
- 30” Pipe – 100%
- 24” Pipe – 64 %
- 36” Pipe – 144%

## PIPELINE LENGTH

- For a Fixed Psi, Discharge Distance Varies With Pipeline Diameter
- 30” Pipe – 100%
- 24” Pipe – 78 %
- 36” Pipe – 124%

## HORSEPOWER

- For a Fixed HP, Discharge Distance Varies With Pipeline Diameter
- 30” Pipe – 100%
- 24” Pipe – 156%
- 36” Pipe – 69%

## MATERIAL IN PIPELINE

- Horsepower Left Over After Pumping Water, Can Pump Sand

## OPERATIONAL FACTORS

- Face
- Twice the Size of the Cutter
- Minimize Dredge Travel
- Fill
- Access to Pipeline and Boosters
- Fuel
- Repairs
- Roll Pipe
- Weather
- Currents
- Low Tide

## Slide 29

## PLAQUEMINES PARRISH POSSIBILITIES

## Slide 31

## Slide 32

## COST FACTORS

- Dredge			20,000’
- Boosters			20,000’
- Pipeline Installation		Marsh
- Wear (4 Quadrants)		12 MCY
- Fill				Spread

## HAUL

- Dredge
- Unloader			20,000’
- Pipeline Installation		Marsh
- Transport			30 Miles
- Fill				Spread

## INDUSTRY PERFORMANCE HISTORY

| 1969 | I-10 Sorrento to LaPlace | 60,000’ P/L |
| --- | --- | --- |
|  | Dredge & 2 Boosters | 21,000 Cy/Day |
| 1972 | Hwy 3127 Killona to Boutte | 31,000’ P/L |
|  | Dredge & 1 Booster | 21,000 Cy/Day |
| 1978 | Larose – Lafitte Hwy | 42,000’ P/L |
|  | Dredge & 1 Booster | 23,000 Cy/Day |
| 1979 | Poydras – Reggio Hwy 46 | 60,000’ P/L |
|  | Dredge & 2 Boosters | 16,000 Cy/Day |
| 2002 | Holly Beach | 38,000’ P/L |
|  | Dredge & 1 Booster | 18,000 Cy/Day |
|  |  |  |

## SUMMARY

- Dredge Type Dependant On:
- Working Conditions
- Material Type / Dredge-ability
- Dredging Quantity
- Conveyance Distance
- Placement Mode
- Bid Competitiveness Dependant On:
- Well Defined Existing Conditions
- Long Lead Times / Contract Durations
- Clear Measurement & Payment Criteria
- Industry Interest Will Be a Function of Size and Frequency of Available Work