Stainless Steel Swagelok Tube Fitting, Fusible Tube Adapter, 3/8 in. Tube OD, °F (°C). L• WARNING. Fusible fittings contain an eutectic alloy plug. The eutectic alloy plug has a specific melting point (see table on other side). If the fitting is exposed . Fusible fittings are pressure relief devices consisting of the body and the eutectic alloy. The eutectic Two types of fusible fittings: Pipe plugs and tube adapters.
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Steel valves with Swagelok tube fitting end connections: °F (°C) max. example, 2-way fusible plug and a Swagelok mud-dauber fitting. The fusible . Fusible fittings contain an eutectic alloy plug, and the eutectic alloy plug has a or above this melting point of fusible metals, the eutectic alloy plug will melt and. Two types of fittings - Tube Adapters and Pipe Plugs with. SS body the melting point of fusible metals, the fusible metal will be melt and the inside pressure.
Select the media factor from Table 3. Calculate the start and end operating torque: Base torque Table 1 temperature factor Table 2 media factor Table 3. According to Table 1, the base start torque is 37 in.
According to Table 2, the temperature factor is 1. According to Table 3, the media factor is 1. Select the desired 40G series valve and packing material.
Using the Calculating Operating Torque instructions at left, calculate the valve start and end torque. Choose an actuator based on the valve start and end torque. See the actuator manufacturers literature to specify ISO mounting dimensions, including flange and coupling sizes.
Select a mounting bracket kit ordering number based on valve series, flange size, and coupling size. Table 1Base Start and End TorqueUse linear interpolation to obtain torque values for system pressures not listed.
System Pressure, psig bar, MPa 0 to Temperature, F C 65 50 to 53 10 to 1. Calculating Operating TorqueIf the valve will be cycled at least once per 3 days, but not more than once per hour: 1. Select the base start and base end torque at system pressure from Table 4.
Select the temperature factor from Table 5. Select the media factor from Table 6. Calculate the start and end operating torque: Base torque Table 4 temperature factor Table 5 media factor Table 6.
According to Table 4, the base start torque is 33 in. According to Table 5, the temperature factor is 1. According to Table 6, the media factor is 1. If the valve will be cycled less frequently than once per 3 days or more frequently than once per hour, contact your authorized Swagelok representative. Table 4Base Start and End TorqueUse linear interpolation to obtain torque values for system pressures not listed.
Select the desired 40 series valve and packing material. The core of low melting-point metal is visible. A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel.
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 it. Its purpose is to act as a last-resort safety device in the event of the water level falling dangerously low: when the top of the plug is out of the water it overheats, the low-melting-point core melts away and the resulting noisy release of steam into the firebox serves to warn the operators of the danger before the top of the firebox itself runs completely dry, which could result in catastrophic failure of the boiler.
His detractors were eager to denounce the whole concept of high-pressure steam, but Trevithick proved that the accident happened because his fireman had neglected to keep the boiler full of water.
He publicised his invention widely, without patent, to counter these criticisms. A steam boiler was fitted with a small observation window of glass and heated beyond its normal operating temperature with the water level below the top of the firebox. When water was added it was found that the pressure rose suddenly and the observation glass shattered. The report concluded that the high temperature of the metal had vaporised the added water too quickly and that an explosion was the inevitable result.
The pressure in the boiler built up to the extent that the injectors failed; the crown sheet became uncovered, was weakened by the heat of the fire and violently blew apart. The investigation, led by Colonel Druitt of the Railway Inspectorate , dismissed the theory that the enginemen had succeeded in starting the injectors and that the sudden flood of cold water had caused such a generation of steam that the boiler burst.
He quoted the results of experiments by the Manchester Steam Users' Association , a national boiler certification and insurance body, that proved that the weight of copper present considered with its specific heat was insufficient to generate enough steam to raise the boiler pressure at all.
Indeed, the addition of cold water had caused the pressure to fall. From then on it was accepted that the correct action in the event of the operation of the fusible plug was to add water.
When this melts, it first melts as a narrow channel through the plug.