A hartford loop is an arrangement of piping between a steam boilers header. In addition to the installation of hartford loop to prevent total boiler water loss from a leak in the condensate piping, the wet condensate return line a steam. A hartford loop is an arrangement of piping between a steam boilers header and its gravityreturn piping. Try teaching that to someone whos been installing steam systems for more then ten years, is like teaching a 10 year old dog to jump through a ring of fire. The general society of mechanics and tradesmen of the city of new york 31,266 views. There were no lowwater operational cutoffs associated with the boiler and its operation. Dec 28, 2016 brief walk through on the hartford loop. It was called the hartford loop after the city central to the insurance industry. Wet return main vent water line hartford loop air water air air air air air steam boiler fires. A proper hartford loop is taken off the equalizing line of the boiler piping with its center 2.
Boiler manuals and wiring diagrams for columbia boiler co. They comprise cookies that are required for technical purposes, and without which the website functionality could not be guaranteed. Hydronic heating boilers description series piping diagram pdf piping diagram dwg genesis one boiler primary, secondary hydronic heating system gb 300 2500 aoshg61080 aoshg61080 genesis two boilers primary, secondary hydronic heating system gb 300 2500 aoshg61081 aoshg61081 genesis three boilers. Determine the ambient air conditions in the boiler area and determine current fresh air supply e. Hartford loop is simply an upsidedown u added to the boiler return that prevents the water from running out of the boiler even if there is a leak in the wet return lines. Introduction to boiler control systems ced engineering. The minimum pipe size for connecting the boiler is 1. Figure 1 shows what the hartford loop looks like in action. This article gives a definition of the hartford loop used on steam heating systems, explains why the hartford loop is necessary to protect against steam boiler damage, and gives a bit of the history of the development of the hartford loop. Jun 15, 2007 the hartford steam boiler insurance and inspection company was, at the time, one of americas larger insurers of steam boilers. The hartford loop was a evaluation to steam heating that saved countless lives. Draining of the boiler can also happen if a leak occurs in the steam supply lines that is larger than the makeup water supply could replace. Hartford loop piping arrangement and wet return are required for steam boilers. Jan, 2009 looking for hartford loop piping diagram for steam boiler answered by a verified plumber we use cookies to give you the best possible experience on our website.
The header should slope towards the equalizing loop. A hartford loop is an arrangement of piping between a steam boiler s header and its gravityreturn piping. The hartford loop on steam boilers definition, function. Surface level rises slightly because the steam bubbles. Correct piping for the hartford loop back into the equalizer on a steam boiler. We call this pipe the equalizer because it balances the pressure between the boiler s steam outlet and condensatereturn inlet.
I guess they think, just because its recommened doesnt mean i have to. A pressure balancing arrangement that prevents the boiler pressure from forcing boiler water into the return lines is called a. Dec 11, 2017 the diagram above is showing the boiler parts which are mandatory for the design and operation of steam boiler. Volume 1, steam boilers steam, heating hot water, and. Perhaps thats the loop hole that allows it to pass inspection. Hoffman specialty basic steam heating system xylem applied. Equip all boilers in gravity return systems with hartford loop as shown in figure 6a and 6b page 10. The shortest possible nipple and an immediate elbow turn the loop down to meet the wet return, forming a water seal. We call this pipe the equalizer because it balances the pressure between the boilers steam outlet and condensatereturn inlet. Near boiler piping kits for peerless series 6364 gasfired steam. Steam production when heat is added to water, its temperature rises at a rate of 0.
Electric cr 16290kw 208v drawings pdf drawings for the electric boiler model cr 16290kw 208v in pdf format. These boilers are welded from thick steel plates that are up to 35 mm thick, making pressures of 30 bar and more possible. Operations and maintenance manual superior boiler works. Looking for hartford loop piping diagram for steam boiler. Dan holohan the lost art of steam heating duration. View and download slantfin gg100h installation and operating instructions manual online. The gifford loop does the same thing and adds better performance. The hartford loop used on steam heating systems, definition, functions, inspection, installation, repair.
High pressure power boiler a power boiler operated at pressures exceeding 20. The hartford loop certified commercial property inspectors. For new boiler s installation into an existing system, a twothree year history of fuel billing data would be helpful in the eventual design of the steamgenerating facility. With a hartford loop, the wet return enters the loop at a point 2 in.
They got tired of all the claims that kept coming in so in 1919 they came up with an idea to keep steam boilers from lifting off. Standard steam boiler plant piping diagram author department of veterans affairs, office of acquisition logistics and construction, office of construction and facilities management, office of facilities planning, facilities standards service. The hartford loop a conventional hartford loop has a single purpose. Maybe they get mixed up in that its only recommened. Electric cr 200150kw 380v drawings pdf drawings for the electric boiler model cr 200150kw 380v in pdf format.
Standard hartford loop diagrams generally place the top of the loop 2 inches below the steam boilers water line. The primary component of a hartford loop diagram is the location of a hartford loop top and its distance from the boiler water top. Hence each boiler part plays important role and everyone interested to know more about boilers can learn from this page in the last section. Jun 24, 2014 a hartford loop is an arrangement of piping between a steam boilers header and its gravityreturn piping. The hartford loop was invented in 1919 by the hartford steam boiler inspection and insurance company as a method to help prevent this condition from occurring, and thereby reduce their insurance claims. Triad highly recommends that boiler feed water be treated before it enters the boiler. The minimum pipe size for connecting to a water storage tank is 1. Equalizer line, hartford loop, wet return, drip line roughin on a steam boiler install duration. Hartford loop steam steam condensate condensate air air steam condensate vent closed vent closed water steam steam steam fills radiators until it reaches the radiator vents. Near boiler piping equalizer, header, feed, drain, and hartford loop connections.
We use cookies on our websites to improve your experience as an internet user, and to optimise our online services. Near boiler piping kits for peerless series 6364 gasfired steam boilers. The end of the header drops vertically below the boilers waterline and. Publishes standard specifications for terminology, labeling, testing and production. If feed water temperature is below 140f it also requires an oxygen scavenger. The hartford loop piping should be piped with a wye fitting or close nipple to avoid noises. Piping vertical risers from boiler to header, risers must be minimum of 24 high above water line. Industrial boiler systems can cope with much higher pressures than pressure cookers.
The end of the header drops vertically below the boilers waterline and connects into the bottom of the boiler. Steam boiler diagram with parts for dummys electrical. I dont know how someone can advocate no hartford loop when its in all boiler recommended pipe schematics period. The hartford loop on steam boilers definition, function, safety. British thermal unit btu the british thermal unit is a unit of measure equal to the amount of heat necessary to raise the temperature of one pound of water one degree fahrenheit. View and download boiler manuals and wiring diagrams for columbia boiler co boilers including mph boilers and ct boilers. The end of the header drops vertically below the boiler s waterline and connects into the bottom of the boiler. Definitions definitions astm american society for testing and materials.
A stable, robust design is also essential if a boiler of this type were. Surface level rises slightly because the steam bubbles displace water. Slantfin gg100h installation and operating instructions manual. Dec 08, 2014 dan holohan the lost art of steam heating duration. Heating boiler a boiler operated at pressures not exceeding 1. If a wet return breaks, the water in the boiler will drop down to the height of the loop,but no farther. Boiler circulators must be rated for open loop applications. A steam boiler is a closed vessel, generally made of steel, in which water is heated by some source of heat produced by combustion of fuel and ultimately to generate steam. In a hartford loop, the system return piping connects into the boiler header with a close nipple. As you can see in the illustration, the hartford loop joins the equalizer making a very simple piping system that dramatically reduces the dangers associated with steam boilers. A hartford loop is the cheapest insurance you can buy to back up that lowwater cutoff should a return rupture and water suddenly leave the boiler. What you should know about the hartford loop and gifford loop. Nowadays, your lowwater cutoff should protect the boiler against a sudden loss of water, but if you have a gravityreturn system, you really should also have a hartford loop. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.
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