Process piping or vessels lined with glass; a glass-steel composite has structural strength of steel and corrosion resistance of glass.


Related Terms

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

AMPLIFICATION

  1. An increase in signal magnitude from one point to another, or the process causing this increase.
  2. Of a transducer, the scalar ratio of the signal output to the signal input

POLYFORMING

A noncatalytic, petroleum-refinery process charging C3 and C4 gases with naphtha or gas oil at high temperature to produce high-quality gasoline and fuel oil; mostly replaced by catalytic reforming; the prodTesting and Materials analysis of paraffins (P), olefins (O), naphthenes (N), and aromatics (A) in gasolines.

PNEUMATIC TEST

Pressure testing of a process vessel by the use of air pressure.

PLUGGING

1. Braking an electric motor by reversing its connections, so it tends to turn in the opposite direction; the circuit is opened automatically when the motor stops, so the motor does not actually reverse. 2. The formation of a barrier (plug) of solid material in a process flow system, such as a pipe or reactor.

PINCH-TUBE PROCESS

A plastics blowmolding process in which the extruder drops a tube between mold halves, and the tube is pinched off when the mold closes.

PHOTOELECTRIC LIQUID-LEVEL INDICATOR

A level indicator in which rising liquid interrupts the light beam of a photoelectric control system; used in a tank or process vessel.

PHOTOFABRICATION

In manufacturing circuit boards and integrated circuits, a process in which the etching pattern is placed over the circuit board or semiconductor material, the board or chip is placed in a special solution, and the assembly is exposed to light.

PHOSPHORIC ACID POLYMERIZATION

A petroleum-refinery process using phosphoric acid catalyst to convert propylene, butylene, or both, into high-octane gasoline or petrochemical polymers.

PHENOL PROCESS

A single-solvent petroleum-refining process in which phenol is the selective solvent.

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