The loop was invented by the The Hartford Steam Boiler Insurance and Inspection Company (Where I work – we’re 150 years old!).
Who invented the heat index? what is the heat index right now.

Do all boilers need a Hartford loop?

If the system has a dry return (as most one-pipe steam system do) you still need a Hartford Loop. … There are no return pipes below the boiler water line, so there’s no danger of losing the boiler water should an above-the-water-line return pipe break.

Where is the Hartford loop located?

1. A Hartford Loop is an arrangement of piping between a steam boiler’s header and its gravity-return piping. The end of the header drops vertically below the boiler’s water line and connects into the bottom of the boiler.

How far below the water line is the Hartford loop installed?

A: Generally, it should be two inches below the bottom of the gauge glass, but check the boiler manufacturer’s specs on this. The centerline of the close nipple has to be below the water line, but above the boiler’s crown sheet.

What is a steam loop?

Definition of steam loop : an arrangement of pipes by which water of condensation can be returned to the boiler without a pump or injector as a result of condensation of boiler steam in a loop of two vertical pipes connected by a horizontal one.

What is the purpose of Hartford loop?

The Hartford loop is needed to prevent steam pressure in the condensate return line from forcing the liquid condensate (water) out of the boiler and back into the return piping system – something that could be a serious problem resulting in boiler water loss and boiler damage or destruction.

What is a Hartford loop?

What Is a Hartford Loop? Simply speaking, a Hartford Loop is a configuration of interconnected pipes associated with the gravity condensate return line on a steam boiler, and the point at which that condensation is re-introduced back into the boiler. It exists between the header of the boiler and the gravity return.

What is a Hartford loop in pool plumbing?

The Hartford loop is a loop of air pipe (PVC) that rises from the air line above the highest possible water line of the spa by between 1″ to 4″ and then returns to the air line (see picture), this creates an air trap to stop water travelling along the air line.

What is an equalizer pipe?

Equalizer pipe means a pipe from below the water level in a swimming pool or spa to the body of a skimmer which is designed to automatically prevent air from being drawn into the pump when the water level drops below the skimmer inlet.

What is a loop on a boiler?

A boiler filling loop is a pipe that is used to connect the central heating system to the mains water supply. Filling loops are used to recharge the water pressure in the central heating system if the boiler pressure gets too low.

Why the pipes which have to convey steam from a boiler must have loops?

The pipes which have to convey steam must have loops because when steam passes pipelines got expand means they take extra length that is why they must have loops.

What is a wet return on a steam boiler?

Definition of wet return : a pipeline in a steam heating system for returning water of condensation to the boiler that being located below the waterline of the boiler can contain only water rather than the steam mixed with water which a return pipe located above the waterline may contain.

What is a boiler blowdown valve?

Blowdown valves are commonly used to control the concentration of dissolved solids in the boiler water. The valves are designed and manufactured according to the requirements of the boiler and the industrial application. … The sealing valve is customarily opened first and closed last.

What is Boiler enthalpy?

The definition for boiler calculations, enthalpy is the amount of heat in a fluid and is usually expressed as BTU/lb or kcal/gram. Enthalpy is considered to be 0 at 32°F (0°C) in these cases. From and at 212°F: A term used to qualify the amount of steam produced by a steam boiler (steam generator).

Is steam hotter than boiling water?

Steam is hotter than boiling water because steam gets some extra heat i.e latent heat (the amount of heat require to change its state . In this case change state from liquid to gaseous state known as latent heat of vaporisation without raise in temperature) even both have same temperature.

How hot is steam in Fahrenheit?

Introduction. When water is heated at atmospheric pressure, its temperature rises until it reaches 212°F (100°C), the highest temperature at which water can exist at this pressure.

How does a two pipe steam system work?

In two-pipe steam installations, steam flows from the boiler to the radiators through an inlet pipe. Once the steam condenses it returns to the boiler through a second outlet pipe. You can typically recognise a two-pipe system from the two pipes and lack of steam vent attached to the radiator.

How do you install a hot water loop on a steam boiler?

A: Fill the zone with water by using the two boiler drains. Put a hose on #1 and purge back through #2. Let the boiler steam, and then start the circulator. Use your two ball valves to blend the water through the bypass until your supply temperature reaches 180 degrees F.

What is a flume box?

Flume Boxes A flume box is an internal equalizer on multi-cell cooling towers. The flume box is a wide rectangular connection that spans from the basin of one cell of a multi-cell unit to another. The flume box allows the water level in both basins to remain at a relatively equal state.

How does an equalizing line work?

The equalization line prevents the pressure buildup in the bonnet. There is no connection made between the upstream side and the downstream side, just between the fluid end and the bonnet.

What is the purpose of equalizing line?

The function of the “equalization line” is to vent the (vacuum-leaked) air from the pump casing to the suction tank which is maintained at sub-atmospheric pressure during running and/or before start-up of the pump.

Can I leaving filling loop connected?

Some people find it more convenient to leave the filling loop attached or next to the boiler. This is actually against regulations, as they state your filling loop needs to be disconnected from your boiler when it’s not in use. If it’s left on, you can cause irreparable damage to your filling loop boiler.

Where is boiler filling loop?

The boiler filling loop is a small braided hose with a valve attached. It can be found inside your boiler, and its purpose is to allow you to add additional water to the heating system. Because the volume of your system is fixed, adding more water increases the pressure.

Why does filling loop have 2 valves?

An external filling loop hose is braided with compression fittings on each end. There are also two valves: one to control the water flow (stop valve) and the other to ensure the boiler water doesn’t go back to the mains (double check valve).

How much condensate is produced from steam?

1 kg of condensate at 5 bar g and 159°C produces 0.112 kg of flash steam at atmospheric pressure. This can be illustrated schematically in the table below. The total mass of flash and condensate remains at 1 kg.

How many types of steam are there?

Part one will review three specific types of steam: Utility, Saturated and superheated steam. Utility steam is sometimes called live steam, plant steam, essential steam, generator steam, but it really means utility steam.

Which boiler is best for fluctuating demand of steam?

A.Lancashire boiler is a fire tube boiler.C.Babcock and Wilcox boiler is a water tube boiler.D.all of the above

What is a dry return?

Dry return — The section of return piping located above the water line in the boiler. Wet return — The section of return piping located below the water line in the boiler. … Its purpose is to keep an equal amount of pressure on the return, preventing boiler pressure from forcing water back up the return line.

How do you flush steam wet returns?

A flush valve on a steam system is like a purge valve on a hot water heating system. You install a gate valve on the return line, just before it enters the Hartford Loop. Right before the gate valve, install a tee with a full-size, full-port ball valve. To flush the lines, close the gate valve, and fire the boiler.

What is Scumming valve?

marine. A boiler mounting used to remove scum from the water surface. A shallow dish is positioned at the normal water level and connected to the valve.

Why bottom blowdown is carried out?

Boiler blow down is done to remove carbon deposits and other impurities from the boiler. Blow down of the boiler is done to remove two types of impurities – scum and bottom deposits. This means that blow down is done either for scum or for bottom blow down.

Why deaerator is kept at height?

Why are deaerators placed at height? Deaerators are placed at height to provide sufficient NPSHa (Net Positive Suction Head available) to the boiler feedwater pumps – the boiler feed pumps are typically situated low in the ship for the same reason.

What is a dry steam?

Dry steam, also known as saturated steam, is produced by heating water in a closed chamber. Dry steam is the gaseous form of water that is able to carry heat and can travel around obstacles and reach areas that wet steam cannot.

How much energy does it take to produce 1 kg of steam?

The amount of energy in one kilogram of condensate at saturation temperature at 5 bar g is 671 kJ.

What is the enthalpy of liquid water?

Specific enthalpy of water (hwater) is given by the product of the specific heat capacity of water Cwater and the temperature. At ambient conditions (Pressure 1 bar), water boils at 100℃, and the specific enthalpy of water is 418 KJ/Kg.