Adjustable wrenches

Machine screws (or bolts) require special tools. The combination wrench is one type of hand tool used with machine screws. The adjustable wrench is more versatile, allowing the technician to use it with different sizes of machine screws (see Figure 8-20). We may also use pliers, second-class levers, during the combining process. Pliers can be found in various types (see Figure 8-21). Slip joint pliers allow material to be held firmly. Needle nose pliers can hold smaller items. Diagonal pliers (cutters) are actually a shearing tool for wire. 

Accident report form Adjustable wrench Air velocity meter Attachable tags and labels Barrier tape Calculator Camera (35 mm)... 

Do not use defective wrenches, such as open-end and adjustable wrenches with spur jaws or pipe wrenches with dull teeth. 

Adjustable wrenches. Adjustable wrenches (keep a 6-inch and a 10-inch in your tool kit) will help you turn the hexagonal nuts of supply lines and compression fittings. They fill the middle ground between tongue-and-groove pliers and proper pipe wrenches. 

I used to reset relief valves on small-pressure vessels in the natural-gas fields in southern Texas. After adjusting the nut on the valve with a wrench, I would raise the vessel pressure to check whether the valve would relieve at the proper pressure. If not, I would continue to adjust the nut and, by trial and error, find the proper relief-valve setting. This is not a particularly practical method to adjust relief valves on stream on a process unit. It is also illegal to do so. 

Figure 4.20 Goniometer head, with capillary tube holder at top. The tool (right) is an Allen wrench for adjusting arcs and sledges. Photo courtesy of Charles Supper Company.

Other tools you will need for HPLC are fairly standard for a lab with a few exceptions. I keep two of the small open wrenches supplied with an HPLC system or a column for use with compression fittings, 1/4-in, a 5/8-in box wrench, and a 6-in crescent wrench for column work, a file, a Terry tool tubing cutter, a couple of pairs of blunt nose pliers for tube flexing during cutting, a reversible screw driver, a jeweler s screwdriver for phoenix block s screws, a universal Allen wrench set, an adjustable-head dental mirror (for seeing behind boxes to hook up leads), and a stopwatch for timing flow. The key is to lock up your tool kit to prevent tool evaporation. 

On the outlet side, inside the valve, are two nuts that can be adjusted with an alien wrench. The top nut is the locking nut and holds the nut underneath it in place. 

Push the wrench in a little further so that it engages with the pressure adjustment nut... 

When you have the bottom nut positioned at the desired pressure, use the alien wrench to tighten the lock nut against the pressure adjustment nut. 

Wrenches, including adjustable, pipe, end, and socket, must not be used when jaws are sprung to the point that slippage occms. 

Leaks are often located at the cylinder valve or at coupling or connectors. Leaks can be detected with soapy water and can often be remedied by tightening the connection with the proper wrench. You should turn off the pressure while you are making these adjustments. If you cannot stop the leak, then seek some assistance from a more experienced colleague or instructor or from your EHS department. 

Connect the regulator to the cylinder using the proper wrench—don t use pliers. Open the cylinder tank valve and you will see the pressure register on the first stage of the regulator. Now adjust the... 

Never open valves rmtil regulators are drained of gas and pressure-adjusting devices are released. When opening CGCs, point outlets away from people and sources of ignition. Open valves slowly. On valves without hand wheels, use only supplier-recommended wrenches. On valves with hand wheels, never use wrenches. Never hammer a hand wheel to open or close a valve. 

The last cut, which frees the notch wood, is made with the saw held vertically in the mill. Adjust the mill while holding one side of a square against the sawbar and the other side across the slide rails (1). Loosen the angle-head bolts with a wrench (2), adjust the saw to depth (3) and tighten the bolts. Mark the cut and the placement of the guide plank (4). Double-check the plank before nailing or clamping it in place (5). 

Gear wrench. This is a two-headed wrench. One end is a valve wrench for turning valve handles. The other end has adjustable jaws for piping and fittings. 

A 16-inch aluminum adjustable pipe wrench (steel is cheaper but twice as heavy). 

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