Pneumatic dampers

Several dampers are operable in Cold Standby. The remote position of operable dampers ts indicated on the ventilation panel (480.30) in the CCR. Operable danqiers are remote actuated from the ventilation panel. Some pneumatic dampers have been plac in the required standby position.. The associated recover tanks were emptied and the air suppty lines (both compressed air and standby air systems) have been valved out or capped to nunimize the leakage potential in the operable portions of the compressed air system. 

Orhanli, T., Finite State Control of Semiactive Knee Joint with Pneumatic Damper and a Test Platform Design for Testing Knee Prosthesis. Hacettepe University, 2014. 

In reality, peristaltic pumps provide a pulsating flow, and often they are responsible for the high noise when low concentrations of analyte are analyzed amperometrically [24], The use of a pneumatic damper can minimize the pulsation in FIA [27],... 

Local electromagnetic and pneumatic components, damper, and valve actuators... 

Actuator An automatic device providing valve or damper control of fluid flow by means of an electrical, hydraulic, or pneumatic motor. 

Airflow rate controller Any mechanical, pneumatic, or electrical device that controls the air flow rare into Or out of a space by increasing or decreasing the flow resistance. See Dampers and Valve. 

Pneumatic control A control system that operates on compressed air as the operating medium for the control of valves and dampers, etc. 

In a similar incident, a furnace damper was closed in error. It was operated pneumatically. There was no indication on the control knob to show which was the open position and which was the closed position. 

Small leaks from the glands of a carbon monoxide compressor were collected by a fan and discharged outside the building. A man working near the compressor was affected by carbon monoxide. Itwas then found that a damper in the fan delivery line was shut. There was no label or other indication to show whether the damper was closed or open. In a similar incident, a furnace damper was closed in error. It was operated pneumatically, and again there was no indication on the control knob to show which were the open and closed positions. 

Damper. A hydraulic or pneumatic device, incorporated or attached to a Cartridge Actuated Device (See Vol 2, p C70-R), in order to limit (dampen) the velocity of the stroking member Refs l)Anon, "Propellant Actuated Devices , ORDP 20-270 (1961), 146 2)OrdTechTerm (1962), 91... 

Twd types of pulse dampers using a controlled gas pressure and a leak have been described one uses a diaphragm to separate the gas and the liquid compart ments and to control the opening of the leak, and the other uses a tee-assembly Such devices act as pressure regulators, and therefore can be considered as pneumatic pumps with unlimited capacity. 

Zone 2A active damper Ap control system (Provides active Ap adjustment for control of contamination from Zone 2A to Zone 2 and HEPA input air filtration.) Fail closed causes increased Ap to from Zone2A Zone 2 Mechanical failure of active damper, loss of air pressure for damper pneumatic actuator, programmed control system failure, or plugged filter Control and monitoring system indications and periodic maintenance inspections Leak rate through airlock doors and Room 109 shielded door may increase to reduce Ap somewhat No effect to positive effect since reduced flow may extend residence time in Zone 2A HEPA and charcoal exhaust filters... 

Postcolumn addition of a sodium hydroxide concentrate is necessary to raise the eluent pH to about 13, a value that is optimal for pulsed amperometric detection. The addition of NaOH can be done pneumatically via a metal-free manifold connected to a reaction coil of corresponding dimension in which the column effluent and the NaOH concentrate are mixed. Alternatively, a pump with a corresponding pulse damper can be used. 

The separation of monosaccharides on CarboPac PAl under isocratic conditions shown above — especially the separation of epimers — can ordy be carried out with a very dilute NaOH eluant (1 mmol/L). An NaOH concentrate (0.3 mol/L) must be added to the column effluent before it enters the detector cell. Subsequently, pulsed amperometric detection with the conventional pulse sequence of three different potentials is applied. Post-column addition of an NaOH concentrate is necessary to raise the eluant pH to about 13, a value that is optimal for pulsed amperometric detection. The addition of NaOH can be done pneumatically via a metal-free manifold connected to a reaction coil of corresponding dimension in which the column effluent and the NaOH concentrate are mixed. Alternatively, a pump with a corresponding pulse damper can be used. Application of the new quadruple pulse sequence (see Section 7.1.2.2) has rendered the post-column addition of an NaOH concentrate obsolete. However, the linear range is not that large in comparison with the detection at pH 13. 

Fig. 6.32 Pulsation damper with perforated plate and hydro-pneumatic tank (source Voith).

Fire dampers and smoke extraction dampers in ventilation ducts with different actuation mechanisms (thermally by fusible link or remote controlled by typically electro-mechanical or pneumatic actuation),... 

Example 3.8.1 We consider the unconstrained truck example where the spring/ damper elements between the wheels and the chassis are replaced by nonlinear pneumatic springs, cf. Sec. A.2 and Fig. A.l. The assembling position of this system is given by... 

For some computational experiments in this book we need also nonlinear force elements. For this end we replace the sprig/damper element between the wheels and the chassis of the unconstrained truck by a nonlinear pneumatic spring, which corresponds to a component also found in real-life trucks, see Fig. A.2. 

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