Popular Questions

What is the purpose of a Hartford loop on a steam boiler?

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 the purpose of a hat channel? what is hat channel used for.

What is the purpose of a Hartford loop on a steam boiler?

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.

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

A proper Hartford Loop is taken off the equalizing line of the boiler piping with its center 2″ below the normal water line. The shortest possible nipple and an immediate elbow turn the loop down to meet the wet return, forming a water seal.

What is a Hartford loop in a boiler?

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 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.

Do you need a 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.

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.

What is a spa Hartford loop?

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.

How many psi should boiler have?

In most cases, it should rise to about 20 psi while its heating element operates. That’s optimal at normal temperatures. Pressure changes of a few psi one way or the other can be brought about by atmospheric conditions. Most boilers are safe up to around 30 psi, at which point seals can begin to fail.

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.

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.

What is a steam loop?

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.

How do you clean a steam boiler?

Steam Boilers To clean a steam boiler, use one pound of trisodium phosphate (TSP) for every fifty gallons of water content. Heat the boiler to 180°F; hold at 180°F for two hours. Do not allow the boiler to make steam. After two hours, drain the boiler and fill with fresh makeup water.

Does the filling loop go on the flow or return?

It doesn’t matter where you put it and no, it will not invalidate a warranty. If you look at vaillant ecotec plus Boilers, their built in loop is on the flow. There are thing that are better placed on the flow such as filters and expansion vessels.

What happens if filling loop is left on?

If it’s left on, you can cause irreparable damage to your filling loop boiler. … They can accidentally knock the filling loop valves, which would allow water to flow back into the system, raising the boiler pressure and cause more problems.

How does a boiler filling loop work?

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.

What is a blown down valve?

What Does Blowdown Valve Mean? Blowdown valves are useful in fossil fuel fired boilers for continuous or intermittent use to drain dissolved solids from the boiler water. These valves are fitted on the drain lines of the boilers.

How do you use a steam boiler?

A steam boiler operates through a combustion reaction between fuel and air, which ignites a flame into tubes that are submerged in water. The heat from this combustion is then transferred from the tube to the water in which the tubes are submerged. The water is then evaporated into steam.

What is the minimum dimension to the lowest steam carrying pipe from the boiler water line?

So the lowest steam carrying pipe in the system must be at least 28 inches above the boiler water line. This dimension is called Dimension A. 3.

What type of boiler operates at 12 to 15 psi?

A – Expansion Tank Residential boilers are designed to work at a certain pressure (usually 12 to 15 pounds per square inch – psi).

Which pipe is the lowest pipe in parallel flow gravity return system?

If you have a gravity-return system the lowest, horizontal, steam-carrying pipe has to be a minimum distance above the boiler. In one-pipe steam, that distance is 28 inches. In two-pipe, gravity-return steam, you need a minimum of 30 inches for every pound of pressure in the boiler.

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.

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.

What happens if boiler pressure is too high?

If the boiler pressure is too high, there’s an increased chance of leaks developing in the system. But if boiler pressure is too low, the system won’t work as well. So keeping the correct boiler pressure is important to make sure that your system heats your home efficiently.

Why is my steam boiler pressure high?

Your pressure relief valve is likely discharging steam and/or hot water for one of 2 reasons: The pressure levels inside the boiler are too high. The valve itself has gone bad and needs to be replaced.

What temp should boiler be set at?

Setting the boiler temperature As a rule, setting your heating control to 75 degrees should be sufficient to give you a perfectly warm house, while also allowing your boiler to run as economically as possible. Once this is set, you shouldn’t need to adjust it.

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

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 do I lower the pressure in my steam?

Reducing Steam Pressure A common way of lowering pressure is by throttling down the size of the steam passageway. For the most basic pressure reduction, it is possible to simply use a conventional globe valve in a fixed partly-open position, or by inserting an orifice plate into the flow of steam.

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 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.

What chemicals are used in steam boilers?

  • Oxygen Scavengers – Most common type is 38%, pH < 4. …
  • Boiler Alkalinity Builders – Potassium Hydroxide or Sodium Hydroxide are the most common boiler alkaline products..

How do you maintain steam heat?

  1. Check the steam gauge regularly: Make sure that it’s within the normal range. …
  2. Check the safety valve every month: Located on the top of the boiler, this important valve vents excess pressure if the boiler goes crazy and exceeds safe levels.

Should a filling loop be left connected?

Should the filling loop be connected permanently to the boiler? No. After the system has been filled and pressurised, the service valves must be closed, the system isolated and the flexible hose removed and stored until it is used again.

How do you know if a filling loop is open or closed?

Filling loops can come in different designs and can be detached from the boiler when not in use. With the black levers in this position the valves are OFF/CLOSED. Find the filling loop and check that both ends are securely attached.

What happens if boiler pressure is too low?

If the pressure on your boiler is too low, then your central heating may not work, and if it’s too high, then it will be under too much strain and could also be prevented from working.

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