TEP Mechanical HEX 007

HEXs are used to ____ the temperature of one fluid by transferring heat to another fluid without mixing the
fluids.

• increase

• reduce or increase

• reduce

• maintain

Exchangers are called ______ when the temperature of a vapor is reduced to the point where some or all
of the vapor becomes liquid by the transfer of heat to another fluid, usually water.

• preheater

• radiators

• condensers

• reboiler

When a hot fluid is cooled to a lower
desired temperature by the transfer of heat to another fluid, usually water, the exchanger is usually referred to as a________.

• radiator

• reboiler

• heater

• cooler

When air is used to reduce the temperature of a hot liquid to a lower desired temperature, the exchanger is
referred to as _____

• preheater

• chiller

• air cooler

• condenser

In shell and tube-bundle exchangers, usually the tubes are attached to the tubesheet by
________.

• threading

• rolling and welding

• rolling

• slot in

What is an advantage of using a S&T HEX consisting of one Fixed Tubesheet with a Floating Head?

• easier cleaning of external of tube bundle

• this type of construction permits free expansion and
  contraction with changes in temperature
  

• lower cost compared to 2-fixed tubesheets type

• higher heat transfer efficiency is provided

Horizontal reboilers normally have a/an ________ above the tube bundle.

• water gauge

• large vapor space

• inlet nozzle

• weir plate

___________ is used to produce vapor from liquids by passing a hot fluid through the tubes.

• Reboiler

• Preheater

• Boiler

• Stream condenser

In S&T HEX, frequently, _________ is located below the shell inlet nozzle to prevent
impingement of the incoming fluid on the adjacent tubes.

• vortex breaker

• tie rods

• an impingement baffle plate

• a longitudinal baffle

Why are plate HEXs easily clogged by dirt and products of
corrosion?

• low temperature service cause more dirt to trap inside

• flow rate is lower in plate HEX

• the flow openings between plates are small

• plate HEX does not have tubes