Fusible plugs article about fusible plugs by the free. Outsidefireside made in the usa, manufactured by stellar industrial technologies more info. Stainless steel swagelok tube fitting, fusible tube. Little confidence is now placed in this contrivance. To put off the fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit and thus avoids the explosion which may. The fusible plug from the authors 1911 45 hp case, cut in half lengthwise to show the fusible material and its apparent change in composition from one end to the other. Creep is a word used to define the appearance of fusible alloy extrusion as it protrudes out beyond the body. Plugin protective devices all powrway iii plugin units are designed with the safety of the installer and user as the key criteria.
Globe technologies is the industryleading manufacturer of fusible valves, specifically designed to handle pneumatic applications. Fuse plug is applicable where heat could initiate fire or an explosive chemical reaction. A fusible plug is a threaded metal cylinder usually of bronze, brass or gunmetal, with a tapered hole drilled completely through its length. Technical bulletin fusible plug pressure rating mueller. Piping material used in the discharge line of a pressure relief device or fusible plug shall be the same as required for refrigerants. Hello,im safety engineer and im working on an offshore project. The initial use of the fusible plug was as a safety precaution against low water.
The fusible plug is a piece of metal or alloy stopping an aperture in some part of the boiler which is directly exposed to the fire, and of such a composition as to melt at a temperature lower than that at which the pressure of the steam would become dangerous. You can also choose from equal, reducing fusible plug, as well as from welding, male, and female fusible plug, and whether fusible plug is casting, or forged. Fusible fittings warning fusible fittings contain an eutectic alloy plug. Panel is equipped with an explosion switch to indicate the activation of a fusible plug. Boiler room log books, fusible plugs and accessories. Busway, fusible for help with bus plug 200a 600v class h 34w from eaton also known as. Here you will find listings of fusible plug, fusible plug manufacturers, fusible plug suppliers and exporters. The following features are standard for both fusible and circuit breaker type plugin units. Fusible plug loop technology posted in refining, hydrocarbons, oil, and gas. The working of a fusible plug is not 100% foolproof. The heritage railway association has used its best endeavours to ensure that the content of this document is accurate, complete and suitable for its. When the plug is under pressure, the alloy can begin to creep as the temperature approaches the alloys plastic range. Any updates you make will overwrite existing information. Fusible plug definition of fusible plug by the free.
The fusible boiler plug in its usual form consists of a brass or bronze casing with external pipe thread, filled from end to end with a fusible metal. Corrosion resistant construction and available in brass or stainless steel fusible plugs are limited to be used in applications where the service pressure does not exceed 500 psig 3,440 kpa. There could be several cases, because of which, the metal sealant may become oxidized, and this might result in increasing its melting point. Vented pressure relief valve assemblies for use in conjunction with 650 externalstyle relief. Ratchet the trigger until resistance is felt and note the amber led coming on to indicate that cooling has begun. The manufacture, inspection and fitting of fusible plugs are safety critical tasks. Elsie manufacturing has a three week lead time for the. Fusible plug manufacturers, fusible plug suppliers, exporters. After this light goes out, move the lever into the most forward position. A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel.
A fusible plug is used in closed vessels, such as air conditioning systems, as a safety precaution against predetermined, high temperatures. Swagelok products and services are delivered locally through a network of more than 200 authorized sales and service centers that support. They are constructed of bronze or brass with a tapered hole drilled lengthwise through the plug. The initial use of the fusible plug was as a safety precaution against low water levels in steam engine boilers, but later. Fusible plugs are installed between the fireside of either the plate, flue or tube of the boiler and below the water level.
Fuse plug alloy metal melts or yields at the rated temperature. Records should be kept of the action taken at each washout and by whom. If the fitting is exposed to temperatures at or above this melting point, the eutectic alloy plug will melt and the pressure inside the fitting will be released to atmosphere. Fireside fusible plug model 28403 conforms to asme standards, with maximum pressure of 250 lbs. Please enter or update the user part number and a comment optional. Only those trained, deemed competent and authorised should be responsible for the inspection of fusible plugs and plug holes, and refitting of fusible plugs. Fusible plugs are thermally operated nonreclosing pressure relief devices to function by the yielding or melting of the fusible alloy.
One end of the plug is attached to the tirehot gases while the other is in contact with water. The fusible plugs protect the turbo coupling against damage due to thermal overload. Fusible plug pressure rating mueller refrigeration. Once installed, the thermal fuse plug requires no attention. A wide variety of fusible plug options are available to you, such as hexagon. Special temperatures available for use in air line or pipe thread applications. All fusible plugs are tested in accordance to ul 207, section 16. They are used as safety equipment with the aim to take a fire and automatically activate all the. Standard leaded fusible plugs our standard bronze fusible plugs are available in a range of standard sizes and oversize threads.
A fusible panel can be manually or automatically activated to operate the delugefoam fire suppression system and to remove the air supply from the shut down panel. Fusible plug article about fusible plug by the free. The standard provides an exception to this requirement to permit the use of type f buttweld pipe for vent systems discharging to atmosphere. An investigation of fusible tin boiler plugs nist page. Fusible plugs are used on some boilers to provide added protection against low water. That is the reason the reliability of this device is always put to test as a last resort. This dasma technical data sheet provides information for the selection, installation and. And, if any such thing happens, the plug would fail to respond. Eaton itap364, fusible, disconnect switches, busway. Plug in tool and put the lever in the center position. These listed manufacturing companies are providing high quality fusible plug at affordable prices. Fusible links are a vital part of a fire protection program.
I would like to have some informations concerning the technology of the fusible plug loop used in our platfotm. Note that the fusible tin still has a metallic luster at the waterside top, while the fireside bottom of the plug is dull, suggesting heavy oxidization. A fusible plug, also known as a threaded fusible plug, is one such device commonly used in steam engines. Fusible plug synonyms, fusible plug pronunciation, fusible plug translation, english dictionary definition of fusible plug. A fusible plug having an operating temperature of 90 95c comprising a metal blank sealed with an alloy characterized. Powrway iii bus plugs have extended ground and neutral bars. Fitok tube fittings, valves, tubing, sampling systems. This mechanical plug is available for manual assembly. A fusible plug is a threaded metal cylinder usually of bronze, brass or gunmetal, with a tapered. Simply open up the casing by removing the screws, and feed your stripped wire through to. Thermal fuse plugs, gmp6 ce certified model code gmp610ce1637. It protects the boiler against damage due to overheating for low water level.
F is reached, an internal ring melts and a plug releases, allowing the gas to exit through the gas bleed ports in the side of the thermal fuse plug. This hole is sealed with a metal of low melting point that flows away if a predetermined, high temperature is reached. The fusible plug is a very efficient component with no need of maintenance. This specification only applies to the test procedure for temperature rating. There are 79 suppliers who sells fusible plug on, mainly located in asia. This temperature sensitive pressure release safety device is used in compressed air and gas applications, nuclear power plant applications as well as other uses. Fusible plug corrosion resistant construction and available in brass or stainless steel underwriters laboratories listed and approved as fusible plugs, refrigerant globe recommends where fusible plugs are installed in an atmosphere which can cause stressstrains or corrosion of surfaces, the plugs be examined annually and replaced if evidence. Fusible plug loop technology refining, hydrocarbons, oil. Mpw is a mechanical, cable mountable plug version of the standard, 3prong, british plug bs 63 with a a fuse. Created with brass, bronze or gunmetal, fusible plugs are formed with a tapered hole. The eutectic alloy plug has a specific melting point see table on other side.
This tapered hole is filled with a lowmelting alloy. It ensures that should water levels recede to dangerous levels, operators will be alerted by a loud stream of steam, allowing them to take action. It is fitted on the fire box crown plate or over the combustion chamber at its appropriate place. They are for use in conjunction with automatic closing devices for fire doors. It is seems that fusible plug loop pressurised by instrument air is an old technology. Meticulously controlled fusible alloy ensures accurate and consistent melt temperatures fusible alloy is cast into plug body to ensure an extremely strong bond between alloy and plug body fusible plug stamped with fusible metal yield temperature.
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