Info

2,000

3/4 - 3" (20')

UNÜtrt WA i bti WUHK lECHNIQUES

2.2.4 Seawater Hydraulic Tools

Using oil hydraulic systems in and around water poses several hazards. Oil leakage results in environmental contamination, poses a fire hazard, and threatens personal safety. The most serious hazard is to the environment. Spilled oil is especially critical when working in ecologically sensitive areas such as estuaries, lakes, or potable water reservoirs. In addition to nor mal equipment downtime, these environmental hazards can prevent completing the mission on schedule.

Many of die disadvantages of oil hydraulic tools can be eliminated by using seawa-ter/water hydraulic tools. Seawater, or freshwater, is an environmentally acceptable alternative to toxic hydraulic oils. Seawater hydraulic tools should be the first choice when working in environmentally sensitive areas.

Vfecotityvt. Temp, for Trlbolut» L-6 & L-1 (Degrees F. v* CenNtaket)

Vfecotityvt. Temp, for Trlbolut» L-6 & L-1 (Degrees F. v* CenNtaket)

1 10 ! poo 1000 10000

19.B 82

Hydraulic Fluid Vbcoefty (Centttokat)

1 10 ! poo 1000 10000

19.B 82

Hydraulic Fluid Vbcoefty (Centttokat)

Figure 2-5

Operate oil-hydraulic tools at the viscosity range. (Shown in the shaded area.)

Seawater hydraulic tools offer the construction diver increased productivity and improved handling. The diver is better able to move about the work site because of decreased hose drag from the single hose, particularly when working in a current. Further, seawater is readily available at the work site eliminating the logistic burden of transporting hazardous hydraulic oil.

The Multi-Function Tool System (MFTS) (Table 2-4) is a seawater hydraulic-powered tool set that provides environmentally safe tools that meet operational needs. The MFTS consists of a diesel-driven power source with two hose reels, a rotary disk tool, a rotary impact wrench, and a handsaw. A hand-held, small hole rock drill is under development.

Each MFTS package includes sufficient spare parts for one operational season and a complete operation and maintenance manual. Built-in commonalty of tool components provides for quick repair with a minimum of spare parts. Each tool is designed so that it can be field repaired in minimum time. The MFTS is designed to be transportable by conventional means such as aircraft, truck, or shipboard.

The seawater hydraulic tools require little field maintenance; unlike oil hydraulic tools, no routine maintenance of the O-rings and seals is required - just a daily freshwater rinse. The impact wrench requires fluid level check of the water soluble oil mixture used to lubricate the impact mechanism. For the bandsaw, spray lubricant applied to the drive chain is necessary at the end of the day.

2.2.4.1 Seawater Hydraulic Power Source. The skid-mounted unit (Figure 26) uses a 41-hp diesel engine coupled to a radial piston pump to supply filtered seawater to the hose reels. A secondary pneumatic system supplies low pressure air to power the seawater lift pump that is used to fill the system reservoir. This gives the system self-priming capabilities but also allows use of pneumatic tools for topside work. From the hose reel, seawater is supplied to the tool through 250 feet of 1/2-inch-diameter thermoplastic hose. Each hose reel provides independent tool flow and pressure controls. Two tools may be operated from the power source simultaneously.

Table 2-4 MFTS Component Description

Component

Flow (gpm)

Pressure (psi)

Weight (lb)

Shipping Total Cube/Weight

Power Source

Max 14

2,000

2,000

64/2,000

Hose Reel

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