The induced voltage is determined by the amount of current carried by the power line, the geometric configuration of the pipeline in relation to transmission line, and the length of the pipeline paralleling the transmission line. The highest induced voltage readings are commonly found in the first few joints of a section as it veers away from the power line right of way after having run parallel to the power line for some distance. 
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a) By grabbing for the marking crayon as it rolls on the horizontal surface of the die into the space between the die and the pipe. Avoid injury: Always weld a tray/receptacle for the crayon on the side of the bending machine.
b) When using a hammer wrench a glancing blow of the sledge hammer is a common cause of crushed/broken fingers. Make sure you have the correct size wrench and the wrench is held firmly so it doesn't spring back causing a glancing blow. Make sure the worker swinging the sledge hammer has somewhere solid and comfortable to stand. If you are in a hurry, you are likely to cause an injury. 
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The standard procedure is to place the rear hook first then the forward hook. If the tractor operator lifts the joint free and hasn't finished centering, or roads forward prematurely, when he makes his lift, the pipe joint can rock forward into the headache rack crushing anyone in it's path. The forward hooker must quickly step out of the pinch point and/or get down from the walking deck after placing the forward hook. If he remains in that pinch area on the walking deck between the headache rack and the pipe, he can sustain a severe abdominal crush injury. The procedure that may be required is: Place the forward end/headache rack hook before the rear hook is placed. The forward hooker must be off the walking deck of pipe truck and on the ground before signal is given for boom to center and lift the pipe joint – however this can create a hazard as the boom hand’s attention will be focused over his shoulder instead of forward. 
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Pressure can twist it off and turn it into a lethal projectile. 45's are better, but the safest blow-down is a straight up nipple.
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Repeated tightening / hot-expansion, cold-contraction, has caused bands to break -welding bug will fall and hit you on the head. Don't tighten bands too much - only snugly. Welders must wear a hard hat when inspecting the weld. Expect the bug to fall.
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Pin can come out of upper block and fall and strike operator on the head. Swamp weight bridle can bounce off the load line hook even with safety latch engaged. Cable can break and fall on the operator. Boom can snap from work hardening (particularly long stick booms) aggravated by brittleness due to extreme cold temperatures.
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1) When close to the welding arc, 
2) when buffing, 
3) when grinding, 
4) when drilling, 
5) when using a sledge or ball peen hammer pounding on: hammer wrench, 
6) pipe clamps, 
7) pins, 
8) when in proximity to hoe rock hammer, 9) hydro-ax, 
10) feller buncher, 
11) hydrovac, 
12) when sandblasting, 
13) when power sawing, 
14) when mowing, 
15) when chiseling, 
16) when painting, 
17) when spraying, 
18) when handling chemicals, 
19) when gas cutting, 
20) when using power tools.
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Be sure to wear gloves when 1) handling tie wire, 2) hot patch sticks, 3) banana knife, 4) wire rope, 5) chains for drag bucket, 6) sharp shot-rock after a blast 7) exhaust of compressor, 8) skids 9) when opening sealed cans of welding rod and 10) When air testing, and two inch iron is very hot.
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Filleting gloves or meat cutting steel lined gloves must be worn when handling metal shavings on prep crew.
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Trucker must get up on the tractor to make sure the boom dog is engaged and the boom brake is set to the proper tension. If not, the blocks may drop onto the pavement, the wire rope will be cut by abrasion and the bottom blocks will fall off onto pavement. On public roads the potential for injury to public is high.
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Hook onto another tractor, and pull the winch line out all the way to check the condition on the line. Pull the line in by winching his own tractor (in neutral) back toward the deadman tractor. Turn/cock his own tractor slightly sideways while watching the line on the drum to ensure the incoming line lays snug up against the previous lay. When laying the line on the drum, pull on something hard, to ensure you pull straight and the line lays on the drum correctly. Cocking his tractor slightly allows each lay to lay snug up against the previous lay. The terminal end should be a factory swage, not a stopper knot. Make sure no one is close to the line when it is under tension. Cat tractors with winch lines should have steel wire guard behind the  operator's seat to protect the operator.
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The mud and suction grabbing at the worker's feet and his forward motion can cause hyper-extension of the knee with resulting serious ligament damage. This results from your foot getting anchored in the mud and your body momentum carrying you forward. Avoid Injury in heavily muddy conditions by carefully planning your route across the R.O.W. and going slowly - don't lunge or rush through the mud - slow down.
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When unhooking a discharge hose from a water pump, the stiff hose once broken free, can spring out of control and the metal coupling can strike the worker in the face causing a serious head injury.
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1) How much current is flowing through the body. 
2) The path of current through the body. 
3) How long the body is in the circuit. Effects can range from a slight tingle to cardiac arrest. There is no exact way to predict the injury at any given amperage.
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A trailer converter dolly, with a frame rigid in the horizontal plane that is towed from two hitches located in a horizontal transverse line on the towing unit, that precludes any rotation in the horizontal plane about the hitch points.
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1) Check wheel hub seals for oil level. 
2) Check rims for cracks near lug nuts. 
3) Check trailer frame for cracks, particularly the back end: beavertail and bolsters.
4) Check tires for integrity. 
5) Check brakes - apply brakes in cab and check for air leaks near axles. 
6) Check that tires, skids & dunnage are chained down and there is no loose mud or debris on deck.
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Because the reach rod will come out of the pipe and hit you in the face or chest.
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Polyester, polyethylene or polypropylene.
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Never park a vehicle close to heavy equipment where you don't have eye contact with the operator. If you can't see the operator's eyes, the operator in his seat can't see you or your vehicle.
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Don’t try to force the articulating ball stud on the side arm into the eye on the C-frame by pushing or leaning with your body, knee or leg against the side arm. The operator will have to tilt and rattle the blade until the ball stud slips in easily. This maneuvering of the blade can cause the pin to be ejected with considerable force. When this has occurred in the past, those untrained workers who were not clear of the side arm swing area ended up with broken legs. The side arm swings out and down, pins you to the ground and crushes your leg. Take the following safety precautions: Standing back, away from the swing area of the side arm, position the ball stud with outstretched hand, ready to step clear if necessary. You can’t manually force the ball stud into the eye on the C-frame. If you don't know what to do stay away - watch and learn. Leave it to the mechanic and his experienced helper.
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Hook a short wire rope sling to the pulling head, then the dozer winch line to the sling. This enables you to use a hoe bucket to hook up the pulling line, and then to attach the sling to a boom load line hook, rather than sending a worker into unsafe ditch.
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When making adjustments by leaning over on the right side of the fuel tank, the mechanic catches the hydraulic lever for the counterweights with his hip engaging the control. As the counterweights come up, his hip successively puts more pressure on the lever. Quickly a point of no return is reached. The more the counterweights come up, the mechanic becomes less able to extract himself. He becomes trapped and is slowly crushed. Safety precautions to take: When a boom hand or a mechanic are setting the brakes on the draw-works winch drums, always de-energize the equipment.
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The cold weather starting fluid, ethyl ether, canisters. Storage and use of these canisters is restricted to temperatures below 160º F. In the summer after shift when the equipment is shut down, temperatures in the engine and battery compartments, without fans running, can easily exceed 160º F. These canisters have been known to explode in the heat, igniting lathe and oily rags stored in a battery compartment. The subsequent fire has burned a hoe to the ground - a total loss.
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The brake is a hydraulically operated disc brake. If the operator bumps the free fall lever getting out of his seat, the load will fall unless the safety latches are set to lock the free fall lever. The brake can be released with the engine stopped or running.
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1) Clothing may be caught on rotating anchor shafts or anchor drive units. 
2) Anchor shaft may bend or buckle. 
3) Using substandard parts creates the risk of fractured metal fragments becoming airborne and injuring an employee. 
4) Trench walls may cave in. 
5) Workers may fall into pump-out sumps. 
6) Anchors may hit underground facilities. 
7) Installation equipment may contact overhead powerlines. 
8) Back injuries from lifting screw anchor components. Safety Precautions to take: