Mts 85X Damper Manuel d'utilisateur télécharger pdf (Page 21)

Damper System Operation Safety

• Use only dry-pumped nitrogen to precharge nitrogen-charged accumulators.

(Dry-pumped nitrogen can also be labeled “oil pumped” or “dry water

pumped.”) Do not use compressed air or oxygen for precharging: the

temperature increase caused by rapid gas compression can result in highly

explosive conditions when hydraulic fluid is in the presence of oxygen or

compressed air.

• Always follow the recommended bleeding procedures before you remove or

disassemble components that contain pressurized gas. When you bleed a gas

or remove a fitting, hose, or component that contains a gas, remember that

many gases cannot support life. Therefore, as the ratio of released gas to

oxygen increases, so does the potential for suffocation.

• Wear appropriate safety devices to protect your hearing. Escaping air or gas

can create a noise level that can damage your hearing.

• Ensure that all pressurized air or gas is bled out of a pneumatic or gas-

charged device before you start to disassemble it. A thorough understanding

of the assembly and its pressurized areas is necessary before you undertake

any maintenance. Refer to the appropriate product information for the

correct bleeding procedure.

It may not be obvious or intuitive which bolts or fittings are used to restrain

a pressurized area. On some assemblies, you must remove a cover plate to

gain access to the structural bolts. Sometimes, to protect you from a rapid

release of trapped gases, a small port is exposed when you remove this

cover plate. Exposing this port ensures that the gas precharge is fully bled

before disassembly. However, this is not the recommended procedure for

bleeding a pneumatic or gas-charged device, because it can expose you to

the dangers of escaping compressed gas and particulates that are expelled

from the chamber or around the seals. Do not assume that cover plates and

ports are installed in all the critical locations.

Consult MTS when in doubt about the safety or reliability of any system-related

procedure or modification that involves devices that contain any type of

compressed gas.

Check bolt ratings and

torques

To ensure a reliable product, fasteners (such as bolts and tie rods) used in MTS-

manufactured systems are torqued to specific requirements. If a fastener is

loosened or the configuration of a component within the system is modified, refer

to the system and component assembly drawings (located on the System

Documentation CD) to determine the correct fastener, fastener rating, and torque.

Overtorquing or undertorquing a fastener can create a hazardous situation due to

the high forces and pressures present in MTS test systems.

On rare occasions, a fastener can fail even when it is correctly installed. Failure

usually occurs during torquing, but it can occur several days later. Failure of a

fastener can result in a high velocity projectile. Therefore, it is a good practice to

avoid stationing personnel in line with or below assemblies that contain large or

long fasteners.

Practice good

housekeeping

Keep the floors in the work area clean. Hydraulic fluid that is spilled on any type

of floor can result in a dangerous, slippery surface. Do not leave tools, fixtures,

or other items not specific to the test, lying about on the floor, system, or decking.

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Mts 85X Damper Manuel d'utilisateur Page 21

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