How do you prevent wet stacking?

Additional Conditions:

Increase the load to meet or exceed 30 percent of the nameplate rating.
Maintain the minimum exhaust temperature as recommended by the engine manufacturer.
Undertake load bank testing for a total of 2 hours continuous loading as follows: Load at 25 percent of nameplate for 30 minutes.

Is wet stacking normal for a standby generator?

Wet stacking is a serious condition affecting diesel generators that operate for extended periods at light load. It can be avoided by proper generator selection, and by properly performing routine generator testing.

What does wet stacking look like?

The most easily identifiable sign of wet stacking is the black, thick liquid oozing from the exhaust system (could be the manifold, turbocharger, or exhaust pipes).

Is it OK to run generator without load?

As a result, generators follow a rule of internal combustion engines – they must have a certain load attached to them in order to operate properly. Running generators on low or no load can have a range of results that can lead to problems, from inefficient running to serious damage or even complete failure.

What is stack in generator?

Wet stacking is a condition in diesel engines in which unburned fuel passes on into the exhaust system. The word “stacking” comes from the term “stack” for exhaust pipe or chimney stack. In diesel generators, it is usually because the diesel engine is running at only a small percentage of its rated output.

How often should a generator be load bank tested?

Testing these emergency power supplies should include monthly half-hour-long tests, but they should also undergo tests that last up to four hours once every 36 months.

What causes Wet stacking in a diesel engine?

When a diesel engine is operated on light loads, it will not attain its correct operating temperature. When the diesel engine runs below its designed operating temperature for extended periods, unburned fuel is exhausted and noticed as wetness in the exhaust system, hence the phrase “wet stacking.”.

What does Wet stacking mean in fire protection?

The National Fire Protection Association (NFPA), in the 1996 edition of their NFPA 110 Code for Emergency and Standby Power Systems, refers to wet stacking as a field term indicating the presence of unburned fuel or carbon, or both, in the exhaust system.

What are the bad effects of Wet stacking?

One of the bad effects of wet stacking is that when unburned fuel is removed from the combustion chamber, it builds up in the exhaust system and fouls injectors while at the same time leading to the buildup of carbon on the exhaust pipes, turbo charger and exhaust valves.

Which is more important stack temperature or exhaust temperature?

The results shows that out of three variables i.e. turbine exhaust temperature, stack temperature and ambient temperature, the most dominating factor of increasing the overall efficiency of the combine cycle power plant is the stack temperature.

What happens to hot gas in Wet stacking?

The piston pushes hot gas out of the cylinder, through the exhaust valve, and into the exhaust system. Some of the exhaust gas is intercepted by the turbocharger in order to drive the compression of the intake air so the cycle can start over. So what happens in wet stacking?

How is the presence of Wet stacking determined?

The later 1999 edition suggests a more quantitative method for determining the presence of wet stacking, by measuring the exhaust gas temperature (which is explained later in this information sheet).

How do you prevent wet stacking?