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High Temp Hot Water Plants > Study Material > Flashcards

Study Material Flashcards

1
Q

At what temp and pressure would high temperature hot water be considered

A

Temps greater than 121C (250F) and pressure is more than 103kPa(15PSIG)

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2
Q

All boilers for medium or high temperature systems are designated and constructed in accordance with ______

A

ASME section 1

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3
Q

Boilers contain a _____ or are connected to an ________ system that maintains the system pressure

A

Vapour space, inert gas pressurization system

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4
Q

High temperature, hot water boilers that utilize a vapour space to maintain a system pressure are trimmed, the same as a high pressure, steam boiler, true or false?

A

True

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5
Q

What is the difference between a high temperature hot water boiler and a high-pressure steam boiler?

A

The difference, in design of the boiler nozzle, which projects down below the boiler waterline inside the shell, and draws its water from there

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6
Q

True or false, the temperature of the water in the boiler is NOT determined by the pressure in the boiler

A

False

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7
Q

System water temperature is controlled by using ________?

A

Mixing valves

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8
Q

Temperature range for a high temperature hot water system?

A

177C-232C (350-450F)

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9
Q

Temperature range for a medium temperature hot water system

A

121C-177C (250-350F)

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10
Q

Temperature range for a low temperature hot water system

A

Below 121C(250F)

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11
Q

When comparing one cubic foot of hot water to one cubic foot of steam water at 177°C(350°F) has _____ times as much heat as the same volume of steam

A

50 times

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12
Q

When comparing one cubic foot of hot water to one cubic foot of steam cooling from 177°C to 121°C it releases ______ times as much heat as the same volume of steam in that temperature range

A

27.6

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13
Q

What type of boiler is the most commonly used for high temperature hot water service?

A

Water tube boiler

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14
Q

Water two boilers can supply anywhere from ______ HTHW to ________ steam to _______ HTHW and ______ steam

A

100% HTHW,0% Steam / 0%HTHW, 100% Steam

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15
Q

In the steam boiler high temperature, hot water system, the lower temperature water returned from the system is directed to the _____

A

Expansion drum

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16
Q

In the steam boiler high temperature hot water system, the return water is __________

A

Sprayed into the steam space to be instantly heated to its saturation temperature

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17
Q

Feed water to replenish the water generated as steam in the boiler is taken from the _________?

A

the discharge side of the system circulating pumps

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18
Q

How is the feedwater fed to the steam boiler?

A

A feedwater regulator

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19
Q

Three advantages of using a steam boiler for high temperature, hot water systems

A

Existing high-pressure plants can be readily converted,
Steam and hot water ratios can be changed to suit,
temporary loss of pressure will not immediately affect the system

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20
Q

High temperature hot water generators are specifically designed for?

A

High temperature heating,
and process systems

21
Q

What is a difference between the generator and the water tube boiler?

A

No steam drum, and designed to to handle low temperature water

22
Q

True or false, a high temperature, hot water generator would use a pad of nonreactive gas such as oxygen to maintain a system pressure greater than the vapour pressure of the water. Nitrogen is not a good source of pressure for these tanks as the nitrogen in the air would adversely affect the systems components

A

False, the non-reactive gas would be nitrogen. Compressed air would not be a good source of pressure for these tanks as the oxygen would adversely affect the systems components.

23
Q

A vertical tank rather than an equally size horizontal tank in order to reduce the interface area between the gas and the water from the system is a definition of?

A

The expansion drum

24
Q

Piping for the high temperature, hot water systems should be?

A

-No less than scheduled 40 pipe
-Conform to ASTM specs
-Designation 53, grade a
-Should be welded in accordance with the requirements of the Canadian bureau

25
Q

Is the use of threaded pipe on high temperature hot water systems permitted

A

No

26
Q

High hot water systems would deal with system, expansion and contraction by

A

-use of steam for pressurizing the expansion drum
-Use of nitrogen or steam pressurized cascade heater

27
Q

All nozzles on vessels must?

A

Have steel flanges

28
Q

When a steam pad is used to pressurize the system, the expansion drum is set

A

Horizontally and elevated above circulating pumps to prevent cavitation

29
Q

Supply water, distributors take up considerable space, and must be properly sized. These distributors should have a diameter large enough to provide a water velocity of not greater than.

A

610 mm (2 ft) per second

30
Q

Where a plant requires low temperature, hot water, or domestic hot water _________ heat exchanger are utilized?

A

Water to water

31
Q

Where a source of low pressure steam is required, an _______ maybe employed

A

Immersion generator

32
Q

How is circulation accomplished in a high temperature hot water generator?

A

Thermal currents of flow from the circulating pump

33
Q

Which gas is preferred to pressurize the expansion drum

A

Nitrogen

34
Q

Does water or steam have more thermal capacity by volume

A

Water

35
Q

What temperature are high temperature hot water systems usually limited to

A

232°C or 450°F

36
Q

Service problems in high-temperature, hot water systems arise as a result of?

A

-design problems
-maintenance procedures not being followed
-Changes to system that we’re not seeing at the time of its conception

37
Q

What can be a problem that’s caused by using steam instead of nitrogen in the system for pressurizing?

A

Steam can cause flashing the system

38
Q

Where will flashing likely occur?

A

At the High Point in the system the furthest distance from the boiler

39
Q

What two gases are used to pressurize a high temperature hot water system

A

Steam and nitrogen

40
Q

What type of vent is used on a high temperature hot water system?

A

Manual

41
Q

Why is the system pressure maintained above saturation temperature of water?

A

So it will not flash

42
Q

What are two advantages of high hot water systems over steam

A

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

43
Q

Most organizations use a combination of maintenance programs that are:

A

Reactive
Preventative
Predictive
Proactive

44
Q

Power piping falls under what code

A

B 31.1

45
Q

Process piping falls, under what code

A

B31.3

46
Q

Building services piping falls under what code?

A

B31.9

47
Q

Power boilers (issued in 1914) fall under ASME section

A

Section one

48
Q

Pressure vessels, division, one(issued in 1925) fall under ASME section

A

Section 8

49
Q

Welding and brazing qualifications fall under what a ASME section? And who in Ontario enforces welding code

A

Section 9, TSSA

High Temp Hot Water Plants (1 decks)

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