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Hydraulic torque wrenches are a staple within the fastening of business bolting applications.

These wrenches are essential to achieve high torque outputs (higher than 600 ft. lbs.) on a fastener. Manual clicker wrenches capable of reaching one thousand ft. lbs. do exist, however they are brutally difficult to use. Power instruments are simpler on the assembler and lead to higher accuracy and repeatability.

Since hydraulic instruments have a high torque output, they should be powered by a hydraulic pump. This pump or “power pack” relays high-pressure hydraulic force via a hydraulic hose with the intention to produce the goal torque output.

If calibrated correctly, the hydraulic pump will allow the user to change the torque setting accurately. Hydraulic pumps might be powered by either pneumatic (air-pushed) or electric power.

Hydraulic torque tools can have a minimal torque of 100 ft. lbs. and a most torque of a hundred and twenty,000 ft. lbs. Each the minimal and maximum torque rely on the capacity and measurement of the hydraulic equipment. Hydraulic torque wrenches are particularly helpful on massive bolts (1-inch diameter or larger). Within the sections beneath, we’ll clarify how hydraulic torque wrenches work, starting with the pumps that energy them and working outward to the instruments themselves.

A normal pump can generate up to 10,000 PSI, and assist you to adjust the torque setting on the hydraulic wrench. Most pumps work with all major software brands.

Pumps are either electric or air-pushed, although you’ll typically see pneumatic hydraulic pumps utilized in hydrocarbon processing. Utilizing an electric pump for some bolting applications may require you to get a “Hot Work Permit,” as a result of electricity.

For all hydraulic torque wrenches, a hose connects the hydraulic pump to the hydraulic wrench itself. The hose connections (or couplers) are set up so that you simply cannot hook up the hose incorrectly — the male/female attachments require the right match with a purpose to connect (see picture above). Subsequently, connecting the hose to the pump is intuitive and easy.

After you energy up the pump, you’ll adjust the pressure to match the correlated target torque value on the calibration sheet. The hose connected to the hydraulic software on what’s called the uni-swivel. Logically, the uni-swivel can handle up to 10,000 PSI.

IMPORTANT NOTE: Hydraulic hoses SHALL (i.e. must) be rated for a four:1 hydraulic pressure, which means rated for 40,000 psi.

There are setting to advance or retract. Advance will fill the piston with hydraulic fluid, which then advances the piston to push on the drive pawls. The drive pawls rotate, which causes the nut to rotate.

ANOTHER IMPORTANT NOTE: Careabsolutely examine a hydraulic hose for damage or holes before use. If pressurized liquid were to escape via a hole, the stream that might result would be capable of causing extreme injury (think: lost fingers or deep cuts).

Low profile hydraulic wrenches include parts: A powerhead and a link. The link makes low profiles distinctive because every set of links fit over a specific size of nut. You possibly can change the link by pulling the link pin, then sticking on a otherwise sized link.

Low profile wrenches go upward from 2,000 ft. lbs. to 4000, 8000, sixteen,000, and so on. You want a link for each wrench of that size, that means you would possibly want multiple links for a 2,000 ft. lb. version, multiple links for the 4,000 ft. lb. model, and so on. Links for various model tools are not interchangeable.

As you may guess from the name, Low Profiles are completely awesome when dealing with low clearance issues. The reaction level for a low profile is correct up against the subsequent adjacent nut. The low-profile wrench would be the assembler’s favorite hydraulic instrument because it is less complicated to make use of than a square drive.

Hydraulic Torque Wrench Safety

With the high-pressure fluid and very powerful mechanical response arms, there’s nice potential for injury with improper hydraulic equipment wrench use. Hex Technology recommends any site that uses hydraulic tools first undergo safe use and operation training.

Always depressurize the hydraulic hose previous to use. Store hydraulic hoses in a circle wrapped finish to finish, and don’t screw the ends on one side together. As mentioned above, if you see any steel braiding bins, cracks, burns or kinks, don’t use that hose.

The other major safety concern for all hydraulic torque wrenches is pinch factors resulting from reaction points. You know enough physics to know that for each action, there’s an equal and opposite reaction. In bolting, this means that if an assembler is applying one thousand ft. lbs. to a bolt, the reaction arm is applying that very same quantity of force to the adjacent nut. You don’t want any part of your body caught between these items of metal.

There are main types of hydraulic tool designs out there: Those with holding pawls and those without holding pawls. A holding pawl permits the tool to ratchet without utilizing the “wind up” on the fastener. The holding pawl will get certain up on the fastener sooner or later, and while the tool will ratchet, it will be hard to take off the flange.

When this happens: DO NOT take a hammer to the tool. Instead, energy up the instrument through the hydraulic pump then depress the holding pawl, and the hydraulic software will release.

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