Mechanical fusible links are utilized as the triggering device in fire sprinkler systems and mechanical automatic door release. On boilers not having wet back reversing chamber, at least one fusible plug. Swagelok products and services are delivered locally through a network of more than 200 authorized sales and service centers that support customers in 70 countries on six continents. Our client recommends to use heatsensitive cable in. Swagelok gap inspection gauge ensures sufficient pullup upon initial installation.
Panel is equipped with an explosion switch to indicate the activation of a fusible plug. The working of a fusible plug is not 100% foolproof. 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. Stainless steel swagelok tube fitting, fusible tube adapter, 38 in. Boiler room log books, fusible plugs and accessories. Overview the instrument air system is a pneumatic system that supplies air for field instruments, the shutdown panel, the esd system, and the delugefusible plug system. A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. Operating fluid leaks out through these fusible plugs. Permission is granted to copy, distribute andor modify this document under the terms of the gnu free documentation license, version 1. There could be several cases, because of which, the metal sealant may become oxidized, and this might result in increasing its melting point.
Little confidence is now placed in this contrivance. The eutectic alloy plug has a specific melting point see table on other side. The two ferrules separate sealing and tube gripping. And, if any such thing happens, the plug would fail to respond. In case of thermal overload of the turbo coupling, the fusible plugs respond. 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. They are used as safety equipment with the aim to take a fire and automatically activate all the sequences both to protect the plant and to safeguard the people. 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. Series pneumatic spring return actuator with a fusible plug. Fusible plug article about fusible plug by the free.
The ruelco fuse plug is a heat sensitive device designed to vent control pressure at a predetermined temperature. The red fusible link wire does not connect to the red harness wire. This temperature sensitive pressure release safety device is used in compressed air and gas applications, nuclear power plant applications as well as other uses. One end of the plug is attached to the tirehot gases while the other is in contact with water. Fusible plugs need not be renewed if a boiler has been out of service since the previous quarterly examination, but in no case is a fusible plug to. Special temperatures available for use in air line or pipe thread applications. Elsie manufacturing has a three week lead time for the manufacture of. Plug in tool and put the lever in the center position. Part description stainless steel swagelok tube fitting, fusible tube adapter, 38 in. The following features are standard for both fusible and circuit breaker type plugin units. The fusible plug is a very efficient component with no need of maintenance.
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. Reinforced openings at both ends allow attachment of straps, hooks and other connectors. Swagelok fusible plug and a swagelok mud dauber fitting. However, this item may be purchased online to be shipped to home or may be purchased in person by visiting a napa store. The installation of the fusible loop are in accordance with api rp 14c recommendation. Hello,im safety engineer and im working on an offshore project. Fireside fusible plug model 28403 conforms to asme standards, with maximum pressure of 250 lbs. These plugs can also be made to order for any special thread sizes. Fuse plug alloy metal melts or yields at the rated temperature. The charge panel will regulate and meter a fix amount of instrument air to the fusible loop.
Plugin protective devices all powrway iii plugin units are designed with the safety of the installer and user as the key criteria. Thermal fuse plugs, gmp6 ce certified model code gmp610ce1637. 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. Connection 1 type swagelok tube adapter connection 2 size 14 in. Fusible definition of fusible by the free dictionary. No torque is transmitted to tubing during installation. Ratchet the trigger until resistance is felt and note the amber led coming on to indicate that cooling has begun. It is seems that fusible plug loop pressurised by instrument air is an old technology. When the plug is under pressure, the alloy can begin to creep as the temperature. Fusible plugs are also used elsewhere than in boilers of the. They are constructed of bronze or brass with a tapered hole drilled lengthwise through the plug. Fusible links include mechanical and electrical devices a mechanical fusible link is a device consisting of two strips of metal soldered together with a fusible alloy that is designed to melt at a specific temperature, thus allowing the two pieces to separate.
Fusible plugs article about fusible plugs by the free. After this light goes out, move the lever into the. I would like to have some informations concerning the technology of the fusible plug loop used in our platfotm. It is fitted on the fire box crown plate or over the combustion chamber at. Please enter or update the user part number and a comment optional. Standard leaded fusible plugs our standard bronze fusible plugs are available in a range of standard sizes and oversize threads.
The shutdown panel is a pneumatic panel located in the deep pit that allows for the automatic operation of control valves throughout the plant when process conditions exceed. Fusible fittings warning fusible fittings contain an eutectic alloy plug. Fusible plug pressure rating mueller refrigeration. The fusible plug melts if the external temperature reaches f c, relieving pressure in the. Powrway iii bus plugs have extended ground and neutral bars. The manufacture, inspection and fitting of fusible plugs are safety critical tasks. The black wire fused by one of the green fusible links goes to the ignition switch. Fusible plugs do not protect against overpressure from improper charging practices underwriters laboratories listed and approved as fusible plugs, refrigerant. An installers pocket guide for vcr metal gasket face seal fittings and microfit weld fittings catalog biopharm fittings, for the bioprocessing and pharmaceutical industries, ts series. An investigation of fusible tin boiler plugs nvlpubsnistgov. We apologize that this item is not available for pickup in store at this time. That is the reason the reliability of this device is always put to test as a last resort.
Stainless steel swagelok tube fitting, fusible tube. Swagelok catalog swagelok northern california ecatalog. Get all the swagelok product catalogs and technical resources in one place. The standard provides an exception to this requirement to permit the use of type f buttweld pipe for. In steam engines the fusible plug is screwed into the crown sheet the top plate of the firebox, typically extending about an inch 25mm into the water space above. The original information frequently comes from documents that are in the imperial system only.
Globe technologies is the industryleading manufacturer of fusible valves, specifically designed to handle pneumatic applications. 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. The initial use of the fusible plug was as a safety precaution against low water levels in steam engine boilers, but later applications. Fitok tube fittings, valves, tubing, sampling systems. The initial use of the fusible plug was as a safety precaution against low water. In case the water level drops below the plug, tin melts and blows out. Any updates you make will overwrite existing information. 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. A fusible plug is used in closed vessels, such as air conditioning systems, as a safety precaution against predetermined, high temperatures.
This hole is sealed with a metal of low melting point that flows away if a predetermined, high temperature is reached. Fusible plug loop technology refining, hydrocarbons, oil. These connect to three wires in the wiring harness, one black, one red and one white. A copy of the license is included in the section entitled gnu free documentation license. Swagelok products and services are delivered locally through a network of more than 200 authorized sales and service centers that support. Once installed, the thermal fuse plug requires no attention.
Records should be kept of the action taken at each washout and by whom. Ruelco fuse plugs are manufactured using a process that assures a leak free operation. The sensing temperature of the fusible material is clearly marked. Fusible plugs are installed between the fireside of either the plate, flue or tube of the boiler and below the water level. Note that the fusible tin still has a metallic luster at the waterside top, while the fireside bottom of. A fusible plug having an operating temperature of 90 95c comprising a metal blank sealed with an alloy. Fusible plug loop technology posted in refining, hydrocarbons, oil, and gas. Includes fittings catalogs, valves catalogs, hose catalogs, and more. Creep is a word used to define the appearance of fusible alloy extrusion as it protrudes out beyond the body.
Only those trained, deemed competent and authorised should be responsible for the inspection of fusible plugs and plug holes, and refitting of fusible plugs. Outsidefireside made in the usa, manufactured by stellar industrial technologies more info. It protects the boiler against damage due to overheating for low water level. A fusible plug is a threaded metal cylinder usually of bronze, brass or gunmetal, with a tapered hole drilled completely through its length. Fuse plug is applicable where heat could initiate fire or an explosive chemical reaction. 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. They are used as safety equipment with the aim to take a fire and automatically activate all the. This tapered hole is filled with a lowmelting alloy. Piping material used in the discharge line of a pressure relief device or fusible plug shall be the same as required for refrigerants. Fusible plugs are used on some boilers to provide added protection against low water. During a fire, the heat generated by the fire will melt one or more of the fusible plug located in or near the fire. Fusible plugs in series 3080 and 3082 conditions for which they have been designed, caused by an excessive external heat source, such as fire.