This author has yet to write their bio.Meanwhile lets just say that we are proud Mike.Lake contributed a whooping 68 entries.
Direct current high voltage testing can be divided into two categories: Proof testing and Controlled Over-Voltage testing. Proof testing qualifies an insulation system to hold a specific voltage. By definition, it is a pass-or-fail evaluation – there is no diagnostic value. Acceptance proof testing is performed on new stator winding as part of in-process and […]
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). […]
A Polarization Index (PI) test is generally performed at the same voltage as the Insulation Resistance (IR) test. Where the IR test is performed for a period of one minute, the PI test is performed over a period of ten minutes. This gives the absorption (polarization) current ample time to decay, and reveals a more […]
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 […]
The Insulation Resistance Test measures the integrity of the generator’s winding insulation, and therefore the likelihood of developing a ground. A test voltage is applied to the generator and the current flow required to maintain that voltage is measured over a period of time (typically one minute). In simplest terms, the less current flow, the […]
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 […]
A confined space does not necessarily mean a small, enclosed space. It could be rather large, such as a ship’s hold, a fuel tank, or a pit. One of the first defining features of a confined space is it’s large enough to allow an employee to enter and perform work. The second defining feature is […]
Your lube oil temperature needs to be lower at startup and shutdown than at full speed. Your turbine’s rotor does not actually ride on the surfaces of its bearings. It rides on a thin film of oil between the rotor and the bearing. At high turbine speeds the rotor hydroplanes across the oil, eliminating contact […]
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 […]
The International Association of Engineering Insurers found that the highest frequency of steam turbine failures worldwide is due to loss of oil pressure. Most of these failures are caused by an unreliable backup system to maintain oil pressure to the bearings should the primary AC-driven lube oil pumps fail. These AC motors are powered by […]
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