There are many more gas-related risks in a home than people are aware of. Usually, these risks are common knowledge but not always.
Using gas-fueled heaters and heating systems puts pollutants into the air in your home. Pollutants such as:
Particulate matter and
Volatile organic compounds.
However, those amounts are rarely tracked in a home.
There is a risk of your heating system leaking, leading to carbon monoxide poisoning.
Poorly maintained, damaged, or overheated gas appliances, as well as your heating system, can explode.
Natural gas is highly combustible so if you ever suspect a leak you should leave the area immediately, make sure you do not flip any electrical switches or use a cell phone.
If you smell the familiar smell of rotten eggs you may have a gas leak. That. the scent is not naturally occurring in natural gas. Natural has no scent at all. That scent is added to help people to smell the gas in case there is a leak. While natural gas indoors poses a risk the two million miles of gas piping underneath our homes pose an even larger risk. Never dig in your yard without calling professional gas fitters north shore for information about how to handle the situation. Should you ever notice dirt moving or blowing up from the ground without wind or bubbling water or hear a hiss, leave the area immediately and have someone well away from the area call 911.
Anything fueled by natural gas can pose a risk:
Hot water heaters
just to name a few.
Burning gas generates lots of particulate-filled vapor which leads to mold, bacteria, and mildew which acts as a transport vehicle to put these volatile compounds into our lungs. When cooking with gas, if you breathe in the cooking fumes, you are in inhaling all the chemicals mentioned above. If you dry your clothes in a gas dryer it still has these chemicals clinging to the fabric when you wear those clothes. This is a major risk for those with asthma or any other immune compromising illnesses. Occasionally check the flame on gas-filled appliances and heaters. The flame should be blue and steady. If the flame is showing yellow or leaning more to one side, you should check for leaks. You may have a crack or corrosion that is leaking natural gas. There is more to natural gas than most people know or think about. But now you are more aware and possibly more educated about the risks.
Gas fittings and equipment are intended for use on pipelines of transportation and supply systems, as well as the distribution of blue fuel. With the help of these devices and mechanisms, the supply is switched on and off, the amount, direction, or pressure of the gas flow is changed. All fittings are characterized by the following main parameters:
nominal (conditional) pressure;
nominal diameter (nominal bore).
The first characteristic is understood as the maximum pressure at a temperature of 20 ° C, which ensures long-term service of various connections of fittings (equipment) and the pipeline. The nominal size (DN or DN) is understood as a characteristic used in pipeline systems, networks as a parameter of the parts to be connected.
According to their purpose, fittings for gas systems are divided into the following types:
Shut-off valves – for periodic shutdowns of equipment and instruments, as well as individual sections of the gas pipeline from its other parts. In this capacity, valves, taps, and latches are used.
Regulating – to change and maintain pressure within the specified limits. It includes dampers, gate valves, and the like.
Safety – used to prevent the gas pressure from rising above the permissible value. This is a relief safety valve.
Shut-off and emergency – for quick automatic shutdown of various gas appliances, devices, as well as pipelines, where the specified mode of their operation is violated. For example, a safety shut-off valve.
Reverse acting – prevents the gas flow from moving in the opposite direction.
Condensate drain – automatically removes the condensate that accumulates in condensate traps and lower points of pipelines.
Ways of connecting gas devices and fittings
There are the following connection methods:
With flanges – used for fittings with a nominal bore of more than 50 mm. Connection to a tank or pipeline is made using flanges. The main advantage is the possibility of multiple installations and dismantling, as well as great strength, reliability, and applicability for a very wide range of passages and pressures. Disadvantages: large weight and dimensions, over time, the possibility of loosening the tightening with a subsequent loss of tightness is not excluded.
Coupling connection – for equipment with a passage of 65 mm or less. The connection is carried out using couplings with an internal thread, using a hex key.
Tsapkovoe with external thread. A device (for example, a tap) is screwed directly into the body of another device or device by means of a thread.
By welding – rarely used non-separable type of connection. Advantages – reliable and complete tightness, minimum maintenance. The disadvantages include the increased complexity of replacement and installation of fittings.
Nipple – connection to a container or pipeline is made using a nipple.
Fitting – using a fitting.
Coupling – the outlet and inlet pipes are connected to the pipeline flanges by means of studs with nuts located along with the equipment or valve body.
Gas shut-off valves – main characteristics
Gas shut-off valves are the most common equipment for gas systems, among which valves are most often used. They are widely used to shut off the gas flow in pipelines with nominal (nominal) bore diameters of 50-2000 mm, where the working pressure is 0.1-20 MPa. In the valve, the passage is closed by moving the locking device in a direction that is perpendicular to the axis of the gas flow. According to the device of constipation, this equipment is divided into:
Wedge gates – with a wedge gate, which has sealing surfaces at a certain angle relative to each other. They can be with a hinged valve, which consists of 2 discs, and a solid (wedge).
Parallel – the valve consists of 2 discs or halves, between which there is a spacer wedge.
The advantages of gate valves over the rest of the valves:
low resistance to flow in the fully open position;
lack of turns of the gas environment;
relatively small face-to-face length;
ease of maintenance;
the ability to supply gas in any direction.
Taps and valves are fittings used to quickly connect or disconnect an apparatus, device, or pipeline, as well as regulate the flow of blue fuel through a gas pipeline. The shutter shape is distinguished:
Advantages of taps and valves: multi-purpose, low height and length, can provide a full passage of gas.
Damper – this valve is referred to as shut-off and control equipment, with the help of which the gas flow rate is regulated and its supply in the pipeline is stopped. It consists of a body (usually steel or cast iron), a shut-off body, which is a disc, a drive shaft, and sealing elements. Valves are used in a wide range of temperatures and pressures of the working medium (if the requirements for the tightness of the locking body are not high). They are produced in series for pipelines with a nominal bore of 50-2400 mm and more. Dampers advantages:
low metal consumption and weight;
small face-to-face length;
the number of elements is minimal;
The listed advantages are obviously the more, the higher the nominal diameter.
Criteria for the correct selection of equipment for gas systems
When choosing fittings for gas systems, one should take into account the chemical and physical properties of the materials used in their manufacture. Natural gas does not affect any ferrous metals in any way, due to which equipment for gas systems can be cast iron and steel. Cast iron fittings have lower mechanical properties than steel fittings and, therefore, can be used at gas pressures that do not exceed 1.6 MPa.
Under the existing norms of the limiting level of hydrogen sulfide content (per 100 m3 of gas – 2 g), blue fuel has practically no effect on copper alloys. In this regard, fittings intended for internal household gas equipment and networks can be made of copper alloys. Valves that are particularly robust must be used with stainless steel insert O-rings.