Water Distribution - Nomenclature

Question 1

DCW (Domestic Cold Water)

Answer 1

Potable water for human consumption, bathing, etc.

Question 2

DHW (Domestic Hot Water)

Answer 2

Heated domestic cold water.

Question 3

HWR (Hot Water Return)

Answer 3

Recirculated DHW to expedite hot water to fixture.

Question 4

TW (Tempered Water)

Answer 4

Potable water, 60°F to 100°F for use at emergency wash fixtures.

Question 5

ICW (Industrial Cold Water)

Answer 5

Non-potable water

Question 6

IHW (Industrial Hot Water)

Answer 6

Non-potable. Heated industrial cold water.

Question 7

RCW (Reclaimed Water)

Answer 7

Non-potable. For reuse in flush fixtures and irrigation AFTER TREATMENT

Question 8

IRR (Irrigation water)

Answer 8

Non-potable used for irrigation or landscaping purposes only.

Question 9

FU (Fixture Units)

Answer 9

A unit assigned to plumbing fixtures to determine water demand.
Can be converted to GPM.

Question 10

TP (Trap Primer)

Answer 10

Adds small amounts of water to p-traps so the seal is maintained on infrequently used sanitary sewer traps.

Question 11

WHA (Water Hammer Arrestor)

Answer 11

ABSORBS water hammer (hydraulic shock) in pipes.

Question 12

PRV (Pressure Regulating/Reducing Valve)

Answer 12

Used to reduce or regulate pressure WITHIN A WATER LINE to a desired setting.

Question 13

PSV (Pressure Safety Valve)

Answer 13

Prevents over-pressurization.

Question 14

Flow Control Valve (Circuit Setter)

Answer 14

Limits the FLOW of DHW to maintain minimum temperature

Question 15

BFP (Back Flow Preventer)

Answer 15

Prevents contamination of domestic water supply.

Question 16

Pressure Drop - Maintain less than or equal to _____for mains and branches

Answer 16

2psig drop per 100 ft of piping

Question 17

Velocity - ACCO standard is… DCW velocities shall not exceed ___ fps and DHW shall not exceed ___ fps

Answer 17

6 and 4

Question 18

Aquastat

Answer 18

A temperature sensor that controls the recirculation pump. Hot water, pump on. Cold water, pump off.

Question 19

What is a mixing valve?

Answer 19

A valve used to reduce temperature

Question 20

Where is a WHA installed?

Answer 20

Before the last quick closing valve in a water line

Question 21

Where is the aquastat located?

Answer 21

on the hot water return loop