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Steam > High Temperature Hot Water Plants > Flashcards

High Temperature Hot Water Plants Flashcards

1
Q

At what temp dose a HTWH start at?

A

177°c - 350°f

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2
Q

What temp do MTHW systems operate at?

A

121°c-170°c 250°f- 350°f

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3
Q

What specifications are HTHW BOILERS set to?

A

ASME Section 1

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4
Q

What boiler type is used for HTHW service?

A

Water tube boiler

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5
Q

Where is the return water directed

A

Feed water regulator

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6
Q

Three advantages to using steam boilers for HTHW systems?

A

a) existing HP plants can be readily converted
b) HTHW and steam systems cab be operated from the same boiler.
c) temp loss of system pressure does not immediately affect steam boiler operation.

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7
Q

How is circulation accomplished in a HTHW generator?

A

Thermal currents flow from the circulating pumps

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8
Q

Which gas is preferred in pressurized expansion drum

A

Nitrogen

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9
Q

Why is compressed air not used

A

Oxygen adversely affects system components.

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10
Q

Dose water or stem have more thermal capacity by volume

A

Water

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11
Q

Why is a manual vent needed

A

To vent air

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12
Q

What is the minimum designation grade pipe used for a HTHW system

A

A54 GRADE A

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13
Q

How is the expansion drum set using a steam pad for pressurization

A

Horizontally

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14
Q

What temperature are HTHW systems usually limited too

A

232°c-450°f

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15
Q

What two gasses are used to pressurize a HTHW system

A

Steam nitrogen

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16
Q

What type of vent is used on a HTHW SYSTEM

A

Manual

17
Q

How dose the HTHW boiler differ from HP steam boiler

A

Boiler nozzle

18
Q

How is LP steam created in a HTHW system

A

Immersion generator

19
Q

Why is the system pressure maintained above saturation temp of water

A

So HTHW will not flash

20
Q

Why can smaller diameter lines be used for HTHW systems

A

HTHW has a higher thermal capacity

21
Q

Why is the expansion drum elevated when using a steam pad for pressurization

A

To prevent cavitation In the pumps

22
Q

All boilers for HTHW systems are designed in accordance with ASME Section 1

A

True

23
Q

What is one similarity in steam boiler design used for HTHW installation that is shared with other types of high pressure steam boilers

A

They are usually of a welded construction

24
Q

How is the circulation of water achieved on a high temp hot water generator

A

Circulation is achieved by a combination of thermal currents and flow from the circulating pumps

25
Q

What are two advantages of HTHW system over steam

A

Less water treatment is required and there is less internal corrosion because less make up water

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