Exploding Sockets Revisited

Recently, one of our sockets exploded while loosening a bolt using a HyTorc hydraulic wrench. No one was injured, but we take these incidents seriously, generating a “Near Miss” report and subsequent corrective action.

We discussed exploding sockets in a previous Safety Tip, which you can review in the May 8, 2012 post (see below). Since that post, we purchased TorcUp sockets for all our tool sets, and sprayed them yellow to make sure they were exclusively used with our HyTorc heads. One of these dedicated sockets broke under load. Please comment (below) on additional steps we can take for our corrective action.  We need your experience and expertise.

Additional information: The broken socket was less than a year old.  It was a 1” drive, 1 5/8” 12 point socket under an 8000 PSI load.  We chose TorcUP sockets as they were the middle of the road in pricing of the three vendors we reviewed (one was HyTorc).

All of us face similar safety concerns in our operations. If you would like one of your concerns discussed in this forum, please contact us via Mr. Turbine (click here) and we will start the conversation in our next newsletter. We will not share your contact info but you can also post anonymously.  Mr. Turbine will be happy to give an immediate response if you request it, but of course we must have your correct info.

Proper Manual Lifting

Back pain constitutes about 10% of occupational injuries and is the most common reason to take leave from work.  Each year about $50 billion is spent on treatment in The U.S. alone, making it the third most expensive condition after heart disease and cancer. With this in mind, an ounce of prevention is worth a pound of cure (pun intended). Before lifting an object of unknown weight, perform several trial lifts using gradually increasing effort.  Do not attempt to lift an object that you cannot confidently handle. Always identify the path you will be taking with the load and clear away all obstacles. Use proper gear for every lift. Wear shoes with good traction and solid gripping gloves which will help you to hold the object for a longer period of time.

Avoid standing too far from the load as it might not provide you the needed grip to hold the object properly. Align yourself properly over the load with your feet and shoulders wide apart. This will give you the exact balance needed to hold the load while lifting it. Never bend at the waist and lift an object with your back. Keep your upper body straight and parallel with your lower legs. Grab the item and push up with your legs, not with your back. Never rotate or twist your body while lifting. Keep your head up when handling the load. Look ahead, not down at the load once it has been held securely. Make sure you lift with a slow, steady force. This will help you avoid muscle strains from having to counter an unbalanced load. Take smooth and small strides to avoid muscle strain from overcompensating for shifting loads. For heavier loads, try lifting with your full breath, and tighten your abdominal muscles for added support. For long lifts, such as from floor to shoulder height, consider resting the load mid-way on a table or bench to change your grip on it.  Always use a lifting belt or back brace if preforming multiple lifts. Don’t lift or handle more than you can easily manage. There’s a difference between what people can lift and what they can safely lift. If at all possible, get help.  Lift with a buddy or use a mechanical lifting device such as a crane, chain fall or a jack.

Starting Over

We’re embarrassed. We had our first recordable accident after 909 days (over
500,000 hours). Just when everything was going so right. We had the toolbax safety meeting at start of shift to discuss the day’s hazards. We had the Job Safety Analysis for the task to be performed. We had top management buy-in and a dedicated and experienced Safety Director conducting random on-site inspections. But a mechanic was not wearing gloves when he knew he should have been, and he cut his finger. He may not have a scar on his finger from the incident, but the permanent scar on his soul gives evidence of the depth of the safety culture at TGM.

And we still had an accident. Take heed from our mistake:

Hands are hurt more often than any other part of the body. Your hands are your wage-earners. As talented as your hands are, they can’t think; they are your servants, and it is up to you to think and keep them out of trouble.

Be sure you wear the right kind of gloves for the particular kind of work you are doing. When you wear gloves, you aren’t trusting to luck and you’re not taking unnecessary chances. Wear gloves when you are doing a job that needs them, but not around moving machinery. Time spent in preparing your hands for the job will not only save trouble for you but will probably save time in doing the job.  Refer to your SDS (MSDS) sheets for gloves required for use with certain chemicals.

Prevent Crushed Fingers

Each year, workers suffer approximately 125,000 injuries that occur when body parts get caught between two objects or entangled with machinery. These hazards are referred to as “pinch points”. If you have ever slammed your finger in a door, you can appreciate the pain associated with this common type of caught/crush injury. The physical forces applied to a body part caught in a pinch point can vary and cause injuries ranging from bruises and cuts to amputated body parts and even death.

To prevent these injuries, look for possible pinch points before you start a task. Take the time to plan out your actions and decide on the necessary steps to work safely. Give your work your full attention. Don’t joke around, daydream, or try to multi-task on the job – most accidents occur when workers are distracted. Read and follow warning signs posted on equipment. If you value all that your hands can do, THINK before you put them in a hazardous spot.

Also, dress appropriately for work with pants and sleeves that are not too long or too loose. Shirts should be fitted or tucked in. Do not wear any kind of jewelry. Tie back long hair and tuck braids and ponytails behind you or into your clothing. Wear the appropriate, well-fitting gloves for your job.

Machinery can pose a hazard with moving parts, conveyors, rollers, and rotating shafts; these are only a few of the vast number of hazards. Never reach into a moving machine. Properly maintain and always use the machine and tool guards provided with your equipment. Don’t reach around, under, or through a guard and always report missing or broken barriers to your supervisor. These guards act as a barrier between the moving parts and your body. Turn equipment off and use lockout/tagout procedures before adjusting, clearing a jam, repairing, or servicing a machine.

Vehicles, powered doors, and forklifts can pose a crush hazard unless they have been blocked or tagged out. Never place your body under or between powered equipment unless it is de-energized. Doors, file drawers, and heavy crates can pinch fingers and toes. Take care where you place your fingers. Test the weight before lifting, carrying, and placing boxes; an awkward or heavy load can slip and pinch your hands or feet. Get help or use tools to move large and/or heavy items.

Take the time to learn about the caught/crush hazards in your workplace so you don’t learn about the consequences first hand (no pun intended).

Surviving Winter Weather

Winter is definitely here across the U.S. Here are some points on surviving the cold that you can tailor to the particular circumstances of your workplace:

Winter Driving

* Keep in mind that while black ice can form anywhere the temperature drops below zero, the condition is more prevalent in some parts of the country than others. Find out about the weather and road hazard patterns in the area you will be traveling.

* Prepare any of your mechanics and subcontractors driving for the possibility of being stranded in bad weather. Remind everyone to carry winter clothing, including boots, gloves, and hats in their vehicles.

* If your mechanics don’t live in the snowbelt, winter driving hazards can be a big concern. You need to emphasize to them the special driving hazards and risks associated with longer hours of darkness and weather such as rainstorms.

Winter Hazards in the Workplace

But it’s not just the road that’s slippery in winter. Loading docks, stairways, equipment yards, parking lots, and other areas of the plant or facility can also become icy.

Adapt safety meetings to the particular fall hazards that are common to your work crew. Do they have to get in and out of vehicles in icy weather? Must they walk along loading ramps to do their jobs? Steps, stairs, ramps, and ladders are all more dangerous in wet or icy weather, especially during the night shift. Remember that moist skin can stick to freezing surfaces. Check your work-site for areas that could be a particular hazard in the cold weather and discuss them in your morning toolbox meetings.

Effects of Darkness

The winter solstice around December 22 is the darkest time of the year. Outdoor workers are likely to be affected most by the increased darkness. But anyone who arrives or departs from work in the dark also needs reminding about special safety concerns, such as increased risk of slips, trips and falls, and personal security risks.

Be cautious using outdoor lighting around utility or construction jobs where flammable gas may accumulate.  It is importance to use light devices designed for decreased sparking.

The long dark winter can create or enhance symptoms of depression in employees, including lethargy, irritability, and forgetfulness. The depression can lead to increased use of alcohol and/or difficulty in relationships, which can further decrease employee productivity and awareness.

Early hours can also lead to dangerous fatigue; talk to the crew about getting enough sleep and coping safely with early shifts.

Make your safety talks address the particular risks cold weather creates on the specific tasks workers perform.

Cold Stress

Workers who are exposed to extreme cold or work in cold environments may be at risk of cold stress. Extreme cold weather is a dangerous situation that can bring on health emergencies in susceptible people, such as those without shelter, outdoor workers, and those who work in an area that is poorly insulated or without heat. What constitutes cold stress and its effects can vary across different areas of the country. In regions relatively unaccustomed to winter weather, near freezing temperatures are considered factors for “cold stress.”

Prolonged exposure to cold, even at temperatures well above freezing, can result in abnormally low body temperature (hypothermia). A body temperature that is too low affects the brain, making the victim unable to think clearly or move well. This makes hypothermia particularly dangerous because a person may not know it is happening and will not be able to do anything about it.

Cold stress is accelerated if a body part is exposed to water. Water conducts heat away from the body faster than air. Local cooling can shut down circulation in the capillaries under the skin, which can result in permanent damage such as chilblains, trench foot or frostbite. These effects can be experienced at temperatures as high as 60 degrees F.

Whenever temperatures drop decidedly below normal and as wind speed increases, heat can more rapidly leave your body. Wear appropriate clothing and protect sensitive areas such as hands, feet and face. Several layers of loose clothing will provide better insulation, especially if you alternate periods of exertion and rest. Wear a cap or rag under your hard hat. Stay in heated locations during work breaks, and limit outside exposure on extremely cold days.

Weather-related conditions may lead to serious health problems. So be prepared to cover up and stay warm.

An Attitude of Safety

Have you ever noticed that people who are successful in life, or are just happy, tend to have a positive attitude? And so it is with safety. Look at it this way–safety rules and procedures are written to protect you from harm. They are not written to make your work life more uncomfortable or inconvenient. After all, safety equipment and training costs your employer additional upfront money.

If you cooperate in safety matters, not only is there a lesser likelihood of you getting hurt, but you will not be doing battle with the people enforcing the safety rules. In addition, you should feel more confident on the job knowing you have a better chance of making it thorough the day without injury. Less fear of injury and the thought of no one on your back has to brighten your day!

We are not perfect. Even the best of us can forget or make errors in judgment. To maximize our safety efforts, we must look out for one another. If someone tells you that you are not working in a safe manner, do not become angry or defensive. They are just looking out for your well-being. If you did not know you were doing something wrong, be thankful your errors were noted before someone got hurt. If you simply forgot or got a little careless, be grateful that someone cares enough to get you back on track. If you see someone doing something unsafe, speak up, but do so diplomatically. Treat others just as you would like to be treated in the same situation.

Remember, attitude affects behavior. If you have a positive attitude, odds are you will exhibit safe behavior. A negative attitude toward safety will only cause conflict, stress and, ultimately, an accident.

This month, TGM celebrates over two calendar years without an OSHA-recordable accident. Please join us in our goal of an accident-free year.

Big Problem = Hot! Hot! Hot!

The current heat wave engulfing the U.S presents big problems for all our employees. Particularly at risk are those who work in high air temperatures and/or high humidity, near radiant heat sources, and/or engage in strenuous physical activities. In other words, conditions typically found on the turbine deck.

When a person works in a hot environment, the body must get rid of excess heat to maintain a stable internal temperature. We do this mainly through circulating blood to the skin and through sweating.  Cooling the body becomes more difficult when the air temperature is close to or warmer than normal body temperature. Blood circulated to the skin cannot lose its heat and sweating becomes the main way the body cools off. But sweating is ineffective in high humidity because the sweat can’t evaporate. In extremely low humidity, sweat may instantly evaporate from the skin, disguising the need to replace that vital water.

If the body cannot get rid of excess heat, the core temperature rises and the heart rate increases. Loss of salts (electrolytes) can impair muscle and brain function. Injury can also result from sweaty palms, fogged-up safety glasses, dizziness, loss of concentration, and burns from hot surfaces or steam.

Excessive heat can cause a range of illnesses, from heat rash and heat cramps to heat exhaustion and heat stroke. Initially, the person begins to lose concentration and has difficulty focusing on a task. He may become irritable or sick, and often loses the desire to drink. The next stage is most often dizziness or even fainting. Heat stroke can result in death and requires immediate medical attention.

The best way to prevent heat-related illness is to make the work environment cooler by staying in the shade and employing fans and adequate ventilation, or even air conditioning. If it is still hot, employ safe work practices such as enforced work/rest cycles, water breaks, and providing an opportunity for workers to build up a level of tolerance to working in the heat. Be sure to include these prevention steps in worksite training and plans. Remember to refrain from alcohol intake the night prior and coffee during the shift. Alcohol, coffee and some prescription medications are diuretics which increase the rate of fluid loss. If the temperature is soaring and you are not urinating, you are not getting enough fluids.

It’s important to know and look out for the symptoms of heat-related illness in yourself and others. Plan for an emergency and know what to do – acting quickly can save lives!

Beware Exploding Sockets

Beware Exploding Sockets

Hytorc® bolting heads have long been regarded as a safer alternative to hammering on a striking wrench to remove stubborn case bolts.  But even impact sockets can shatter under extreme Hytorc® pressures, sending shrapnel rocketing across the turbine deck.  These explosive failures can cause serious injury or even death.

These failures can be reduced, but not eliminated, by using the correct socket. Impact rated sockets must be used at a minimum.    Old or worn sockets are of particular concern. Ill-fitting sockets do not fit tight on bolt heads.  This changes the stress points from the corners to the flats of the sockets and causes them to fail.  Best practice is to inspect sockets regularly and color code or otherwise identify them for this use. Another check for reliability would be to have the sockets inspected for potential indications of stress using NDE methods.  Hytorc® makes their own sockets and this may give an extra level of confidence.  However, in their safety note, Hytorc® only prohibits the use of altered, heavily used, damaged or chrome sockets.

Any socket can fail, so take steps to mitigate the result.  If possible, shroud the socket with a piece of pipe cut slightly bigger than the diameter of the socket and same height. If the socket fails, the pipe will hold everything inside. TGM is currently investigating a fiber impregnated tape designed to contain the debris. We also recommend tying off the head to prevent it dropping or flying off after a failure.

Be aware of your hydraulic forces.  Sockets are prone to failure when torqued more than twice the specified amount for assembly. Backup wrenches may not be rated for the torque applied.  Limit torque to the capacity of the weakest tool in the application.  Hytorc® publishes charts on their website which convert pump pressure to torque applied for each of their tools.

Finally, protect your personnel.  No one is to be in contact with the head or backup wrenches after initial clamping pressure is applied and until pressure is released. Determine the potential debris path and keep personnel away from the area. You can also use a piece of plywood or metal as a shield.  Face shielding is recommended as PPE for all personnel near the danger zone.

Remember that Hytorc® equipment is dangerous and must only be operated by trained individuals.  Best practice is to have the same person operate both the tool head and the pump.  When this is not possible, the pump operator must be in sight of the tool operator.  Three way communication must be used between them.

Safety Tips

At TGM, our motto is Safety, Quality, Production . . . In That Order! We currently have:

Zero OSHA Recordable Accidents for 528th Consecutive days!

Safety is Turbine Generator Maintenance’s top priority. TGM puts safety above all other considerations and expects that devotion from every TGM employee. Please see our dedicated Safety section of our website for more information on TGM’s Safety Program.

COMMON SENSE AND ACCIDENT PREVENTION

The experts say at least 80% of industrial accidents are caused by unsafe acts on the part of employees–and not by unsafe conditions. Here are a few actions, paired with safety suggestions:

  • Being in a Hurry – Don’t let the concern for completing a job quickly overshadow safety.
  • Taking Chances – Daring behavior or blatant disregard for safe work practices can put the whole work team at risk.
  • Being Preoccupied – If your mind is troubled or distracted, you’re at risk for an accident.
  • Having A Negative Attitude – Being angry or in a bad mood can lead to severe accidents because anger nearly always rules over caution.
  • Failing To Look For Hidden Hazards – Always be alert for changes in the jobsite environment. Hidden hazards include spilled liquids, out-of-place objects, unmarked floor openings, etc.

Awareness of your environment, self-preservation, and concern for your fellow workers are all factors in good common sense. All workers can prevent themselves from getting hurt.