Fire Investigation in commercial kitchens - Introduction to the series

Series Introduction

This is the introductory article of a series on a better understanding of fires in commercial kitchens systems. In the coming months we will be adding this series with different themes, a fire investigator to know when the investigation requires large kitchen fire.

Exhaust System

Fires of commercial cooking appliances are an important part of the problem of fires in the United States. According to NFPA statistics, on average, instead of 11 100 fires in eating and drinkingStructures. The origin of half of these fires in the kitchen - the place of appliances that produce heat.

The application of the principles of fire investigation in commercial kitchens requires an understanding of:

the operation of commercial kitchen such as kitchen utensils are related to each other the production of fat deposits flammable how these clusters influence on the spread of fire expectations of refractory installation work theMaintenance of the exhaust system and operation of fire protection system

Stages of a kitchen grease fire

Food preparation requires heat, fueled by methane gas, in many cases. Cooking food results in the production of vapors acids, which sucked in the exhaust system by a fan. These fats flammable quickly condense in the exhaust system, accumulating a lot of fuel over time and delayed the ability of the exhaust gas and smoke alarmsOperating as intended. Kitchen malfunction, human error or excess fat causes inflammation of the oils and creating lasting flare-ups (uncontrolled incineration). It can burn incident heat (flame) of the first uncontrolled enough energy to light up the fat deposits on filters and hood, which spread.

After ignition occurs inside the hood area, several factors will determine whether the burn continues, and the intensity of uncontrolled,including:

Continue the heat of combustion is not controlled by the first device on Area near the device cap The failure of the sprinkler system as required Accumulation of fat inside the exhaust system Actions (or inaction) by the kitchen staff

Under normal conditions, the movement of air through the fan, provided that all the oxygen needed to keep burning. This air movement has encouraged the fire till now in the pipeline. The radiant heat from a firein the channel often heated building materials, the spread of fire from the exhaust system and into the building. When the fire reached the fan, the heat from the fusion of droplets aluminum fan on flammable roofing materials, turning these areas.

This distribution is the "typical" of a heavy accumulation of damage to the kitchen fire. Of course there are a number of other variables.

Almost all these possibilities of proper design, installation can be prevented andMaintenance of fire and building codes standards. But, in a nutshell, many commercial systems kitchen exhaust are not installed or maintained by the Fire Code.

Phil Ackland

Fire Investigation in commercial kitchens - Introduction to the series

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Introduction to the basics of camshafts - Purpose and

We have engines and combustion, pass through to speak to your current vehicle. It is essentially the fuel into the combustion chamber, a small explosion triggers the candle is contained in the chamber, and leaves the resulting exhaust gas. The entrance to the departure of the fuel and the exhaust air can be controlled much of camshafts. Below I will explain what they are and describe how they do their jobs.

Camshafts described

Exhaust System

A camshaft is a rodThe cams are seated. The cams (sometimes known as Lapps) are oblong, with a clear end protruding out the auction. As the rod rotates, the cams. The protruding end of each lobe is what ultimately they can do their work.

Understanding of their work

First, to better understand the role of the camshaft, let the 4-step process that happens inside your car to check the combustion chamber. If the intake phase begins, there is a bulb at the top of the chamber.The piston goes down, the intake valve opens and the room fills with air-fuel mixture. Then begins the compression and the piston rises, compressing the air-fuel mixture in the chamber.

The power stroke begins when the piston reaches the top of the chamber. At the top is a candle. The candle lights the compressed air-fuel mixture, resulting in explosion. The strength of the 'explosion pushes the piston toward the bottom of the chamber. How's it going down the drainOpens the exhaust stroke begins. The piston rises and forces the exhaust gases from the combustion chamber.

The description above the 4-stroke engine goes through the process is needed to fully appreciate the work of the camshafts. I said that the intake valve open during the intake stroke. How it works, expresses a fuel injection valve in the fuel chamber. The intake valve opens, the result of the cams on the camshaft. As the rod rotates, the protruding end of the elongated campressed against the tip of the intake valve. How it works, it forces the valve downward and creates an opening into the combustion chamber for fuel.

You will remember that the exhaust valve opens to increase the power piston from the exhaust, which is after the power stroke. This is done in the same way as with the intake camshaft. An exhaust camshaft and a cam turns on the elongated rod pushes on the tip of the exhaust valve. This creates an opening inthe chamber through which gases are expelled.

This process occurs hundreds of times per minute, while you're away. The entire system is designed around impeccable timing. While the engines to attract more attention from consumers, would not work properly without the camshafts.

Introduction to the basics of camshafts - Purpose and

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