Diaphragm, ruptured

Diaphragm rupture is the most common failure in a regulator. Most regulators fail to open completely on diaphragm failure, which is an unsafe condition. In installations where it is imperative that the process continue to be supplied even on a regulator failure, two regulators can be placed in series. 

Many capillary transducers are filled with mercury. Since the diaphragm of the transducer is quite thin, there is a danger of the diaphragm rupturing and leaking mercury into the plastic and into the workplace. Unfortunately, many transducers do not carry a label indicating that the transducer is filled with mercury, so adequate safety precautions are not always taken. It is important to make sure that mercury-filled transducers are not used in the extrusion of medical products and food packaging products. In these situations, other liquids can he used inside the transducer the most common alternative to mercury is NaK (sodium-potassium). 

The other situation can be realized when the HPC is filled with water at Ta > 373 K. After diaphragm rupture, water becomes superheated relative to the conditions in the LP (pi = 0.1 MPa, Ti = 253 K) and because of this, intense vaporization occurs. Sudden expansion of the vapor can lead to the onset of shock waves. Mass addition to the vapor phase exists in the rarefaction wave, which exerts essential influence on the intensity and duration of the shock wave. 

Diaphragm piston pumps use a sort of oil chamber between a reciprocating piston (operated by a crankshaft) and the diaphragm (Figure 9-10). Provided that no puncture occurs in the diaphragm, slurry does not come in contact with the piston. A special control system is installed to detect diaphragm rupture. 

Figure 9.21 Diaphragm motion in the working space (a) between hole plates , (b) diaphragm rupture by dumped particles, (c) position control (diaphragm prevented from contacting chamber wall).

In the event of a diaphragm rupture, radioactive fluid is still retained within the piping system. 

One mole of CO is initially contained on one-half of a weU-insulated, rigid tank. Its temperature is 500 K. The other half of the tank is initially at vacuum. A diaphragm separates the two compartments. Each compartment has a volume of 1 L. Suddenly, the diaphragm ruptures. Use the van der Waals equation for any nonideal behavior. Answer the following questions ... 

These are thin diaphragms held between flanges and calibrated to burst at a specified static inlet pressure. Unlike relief valves, rupture discs cannot reseal when the pressure declines. Once the disc ruptures, any flow into the vessel will exit through the disc, and the disc must be replaced before the pressure vessel can be placed back in service. Rupture discs are manufactured in a variety of materials and with various coatings for concision resistance. 

Most reactions in solution have rather small AV" values (usually Av" is less than 20 cm /mol), so only small perturbations are possible. The pressure change is created by rupturing a diaphragm separating the reaction solution from a pressure vessel. A typical pressure change is about 60 atm. 

A rupture disk is a non-reclosing thin diaphragm (metal, plastic, carbon/graphite (non-metallic)) held between flanges and designed to burst at a predetermined internal pressure. Each bursting requires the installation of a new disk. It is used in corrosive service, toxic or leak-proof applications, and for required bursting pressures not easily accommodated by the conventional valve such as explosions. It is applicable to steam. 

Users are warned that an ordinary spring loaded safety relief valve will not open at its set pressure if back pressure builds up in the space between the valve and rupture disk. A specially designed valve is required, such as a diaphragm valve or a valve equipped with a bellows above the disk. 

In the pressure-jump method, the solution is pressurized, usually to several thousand atmospheres. At the desired moment a diaphragm is mechanically ruptured. The... 

In a review of incidents involving explosive reactivity of liquid chlorine with various organic auxiliary materials, two involved hydrocarbons. A polypropylene filter element fabricated with zinc oxide filler reacted explosively, rupturing the steel case previously tested to over 300 bar. Zinc chloride derived from the oxide may have initiated the runaway reaction. Hydrocarbon-based diaphragm pump oils or metal-drawing waxes were violently or explosively reactive [8], A violent explosion in a wax chlorination plant may have involved unplanned contact of liquid chlorine with wax or chlorinated wax residues in a steel trap. Corrosion products in the trap may have catalysed the runaway reaction, but hydrogen (also liberated by corrosion in the trap) may also have been involved [9],... 

If the piston is replaced by a diaphragm and the diaphragm is ruptured, the problems would be analogous the only difference being that the pressures and velocities are continuous across the piston... 

When the tube was operated as a shock tube (i.e. when detonation was initiated from a shock), a diaphragm of cellophane or photographic film was inserted in the union along with an Oring to seal the test chamber. To burst the diaphragm compressed He or H was fed into the reservoir section until rupture occurred. The burst pressure was read from... 

Delay Element E (Fig 1-46) is known as Pressure Type because it utilizes the pressure evolved by burning BkPdr to achieve short delays, such as 0.001 - 0.006 sec, which are difficult to obtain with other types of delay elements. The principle involved in this element is a rapid build-up in pressure which terminates in rupturing a disk or diaphragm. 

PELLET RING OR CONTAINER RUPTURE DIAPHRAGM (.005 INCH PIG TIN )... 

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