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Categories starting with D

Items starting with D


DCS Control System. A DCS (distributed control system) is a manufacturing or process control system in which the controller elements are not centrally located, but distributed throughout the system with each sub-system controlled by one or more controllers. The entire system of controllers is connected by networks for communication and monitoring. The processor receives information from input modules and sends information to output modules. Input modules receive information from input instruments in the process and output modules transmit instructions to the output instruments in the field. Elements of a distributed control system may directly connect to equipment such as switches, pumps, and valves. DCSs control manufacturing processes that are continuous or batch-oriented, such as oil refining, petrochemicals, central station power generation, pharmaceuticals, food & beverage manufacturing, cement production, steelmaking, and papermaking.

  • SPEC #: 17651
  • Code: 17-50-01

Decon Autoclaves

Decon Autoclave: An autoclave is a device that uses steam to sterilize materials by inactivating all bacteria, viruses, fungi, and spores. A decontamination autoclave is used to sterilize medical or biological waste prior to disposal into a municipal solid waste stream. This is an alternative to incineration in some applications.

  • SPEC #: 18602
  • Code: 18-16-02

Depyrogenation Ovens

Depyrogenation Ovens: These ovens are used to remove pyrogens from drug product containers and solutions, most commonly from injectable pharmaceuticals. Pyrogens are any substances that can cause fever. Temperatures required to break down this substance is in excess of 300 degrees Celsius.

  • SPEC #: 18604
  • Code: 18-16-04


Automated Diaphragm Valve: The same as a manual diaphragm valve (see above), except the valve mechanism is moved by an electric, pneumatic, or hydraulic motor which is controlled by a remote switch or remotely generated electronic signal.

  • SPEC #: 17950


Manual Diaphragm Valve: A device, also called a membrane valve, comprised of a valve body with two or more ports, a diaphragm, and a "saddle" or seat upon which the diaphragm closes the valve. Diaphragm valves are frequently used by the bio-pharmaceutical industry by using compliant materials that can withstand sanitizing and sterilizing methods. There are two types of diaphragm valves: the saddle type and the seat type. The saddle-type valve has two ports in line with each other on the opposite sides of the valve. The seat-type has the in and out ports located at 90 degrees from one another. The saddle type is common in process applications. The seat-type is commonly used as a tank bottom valve.

  • SPEC #: 17850

Diaphragm Seal

Diaphragm Seal: A flexible membrane that seals and isolates an enclosure. The flexible nature of this seal allows pressure effects to cross the barrier but not the material being contained. Diaphragm seals are commonly used to protect pressure sensors from the fluid whose pressure is being measured.

  • SPEC #: 17140
  • Code: 17-01-04

Direct Steam Injectors

Direct Steam Injector Heat Exchangers: This is a static heat pump, with no rotating machinery or refrigerating fluid, that uses steam for its driving energy. Low pressure thermal wastes go through an exchanger evaporator where part of the heat is turned into latent heat of vaporization, which produces low pressure steam. This steam is compressed in an ejection compressor by the driving steam. At the ejection-compressor outlet, the steam is condensed in an exchanger and releases its latent heat.

  • SPEC #: 18274
  • Code: 18-07-13

Disc Stack

Disc Stack Centrifuges. A disc stack centrifuge is a clarifier whose base is wrapped around a center line. Slurry is fed into a scroll at the center from which it is accelerated circumferentially and forced through distribution ports into the bowl. The slurry rotates with the bowl and forms a concentric layer at the bowl wall. Solids are deposited against the bowl wall by centrifugal force. The scroll rotates at a different speed than the bowl and moves the solids toward the conical end of the bowl from which they are ejected through ports to fall through to the discharge chute.

  • SPEC #: 18181
  • Code: 18-08-01

Dispersion Pumps

Dispersion Pump Mixers. These mixers prepare finely dispersed fluids. They employ a series of impellers, rotors, or turbine-like mechanisms, usually ganged in series and closely spaced at very tight tolerances, to shear particle clumps into finer powders. and propel them into the carrier liquid in mixers of various design. They are used in a wide variety of chemical industry applications including the de-agglomeration of polymer resins, the maceration of fermented seaweed, and the dispersion and viscosification of viscosity adding powders. Industrial designs disperse solids into liquids at high flow rates.

  • SPEC #: 18123
  • Code: 18-02-03

Distillation Column

Separation-Distillation Column. Separation by distillation is a process that separates chemical substances based upon differences in their volatilities in a boiling liquid mixture. Fractionating columns are essential to this process. Fractionating columns separate the mixture by allowing the mixed vapors to cool, condense, re-vaporize. With each condensation vaporization cycle, the vapors are enriched in a certain component. Fractionating columns are used in small-scale laboratory distillations as well as for large-scale industrial distillations. Industrial distillation is typically performed in large, vertical cylindrical columns known as distillation towers.

  • SPEC #: 18231
  • Code: 18-13-01

Distillation Column Internals

Separation-Distillation Column Internals. These are components that are assembled inside the column to enhance the distillation process. Some of these components are: flash boxes, which are mounted adjacent to overheating feeding point; support frames, which hold the rods upon which packing is placed; liquid collectors, which collects liquid trickling down from overhead packing; and vapor distributors, which help to achieve a uniform flow across the entire column.

  • SPEC #: 18232
  • Code: 18-13-02

Distillation Packaged Systems

Separation-Distillation Packaged Systems. In chemistry and chemical engineering the separation distillation processes separate substances into two or more distinct products. The distillation process separates chemical substances based upon differences in their volatilities in a boiling liquid mixture. Fractional distillation is particularly suitable for critical applications that require separation of complex mixtures such as fine chemicals and pharmaceuticals, anywhere where a finer level of purity is needed or when component’s boiling points are close. Fractional distillation eqiupment is available is a multiple range of sizes from the lab scale solvent recovery through processing scale.

  • SPEC #: 18233
  • Code: 18-13-03

Double Conical Blender

Double-Cone Conical Blender Dryer. This is a batch dryer. It is mounted horizontally for the drying operation. Like other batch dryers, it has a heated wall, and a vacuum is applied to remove vapor. When drying is complete, the machine is moved to a vertical position to discharge the dried solids from a nozzle at the bottom of the cone. Its tumbling action provides good mixing and regular contact between the solids and the heated wall. These dryers are manufactured in a number of materials, including glass-lined steel, which provides some nonstick property and corrosion resistance.

  • SPEC #: 18193
  • Code: 18-09-03

DP Cell Level Transmitter

DP Cell Level Transmitter. A DP, or differential pressure, level transmitter measures the head pressure of a liquid in a tank, using a detector mounted at the bottom of the tank being monitored. The higher pressure, caused by the fluid in the tank, is compared to a lower reference pressure, usually atmospheric, and the result is converted into a height measurement. The device generates an electrical signal that can be used to control a readout or other device. DP level transmitters provide output as a continuous reading of the level.

  • SPEC #: 17510
  • Code: 17-05-01

Drives & MCC

Drives & MCC Control Systems. A motor controller is a device that controls the performance of an electric motor. It might include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and faults. A motor control center (MCC) groups these motor controllers and related devices in one compact structure. A motor control center consists of one or more enclosed vertical sections mounted on the floor. It contains incoming line facilities, a common horizontal bus, wireway trough, and conduit facilities for incoming and outgoing wires. Each vertical section typically contains a vertical bus connected to the power bus, a vertical wireway, one or more combination motor control units, and various related devices, including push buttons, selector switches, etc.

  • SPEC #: 17656
  • Code: 17-50-06
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