Water Supply and Distribution Systems Review Flashcards

Fill-in-the-blank practice flashcards covering water supply systems, piping materials, water demand calculations, direct pressure design, and hydro-pneumatic/gravity systems.

According to 1999 NPCP Sec. 609.7, no building water service pipe shall be less than __________ in diameter.

19mm (2/3")

A pipe fitting that is threaded on the outside at both ends and used to join couplings or other fittings is called a __________.

nipple

A Galvanized Iron nipple that is below $3\,\text{inches}$ ($75\,\text{mm}$) in length is known as a __________ nipple.

short (or shoulder)

A pipe fitting having a bend with an inside thread on one end and an outside thread on the other is called a __________ elbow.

street

A valve in which the flow of fluid is cut off by means of a circular disc fitted against machine-smoothed faces at right angles to the flow direction is a __________ valve.

gate

A control valve screwed into the street water main to supply the house service connection is called a __________ cock.

corporation

An unwanted sound created by pipe vibration due to the sudden stoppage of water flow is known as __________.

water hammer

An escutcheon is a circular disc or flange on a pipe used to cover a __________ in a wall or floor through which the pipe passes.

hole

According to the pipe color coding standards, pipes conveying Fresh Water are colored __________.

Green

Galvanized steel supply pipes are typically $1/2\,\text{inch}$ in diameter with a standard length of __________ feet.

20

PPR PN 10 pipe is designed for cold water piping, having a nominal pressure rating of $10\,\text{Bars}$ or __________ kPa.

1,000

PPR PN 20 pipe is suitable for hot & cold water piping, having a nominal pressure rating of $20\,\text{Bars}$ or __________ psi.

290

Unplasticized polyvinylchloride (uPVC) pipes do not contain phthalates and __________.

BPA (Bisphenol A)

A coupling designed to re-connect PVC pipes or connect two pipes into a pipeline is called a __________ Joint.

Gibault

Among copper tubings, Type __________ has the thickest wall section, is color-coded Green, and is used for deep underground burial.

K

Copper tubing color-coded in Blue with a wall section most popular for water supply systems is Type __________.

L

Copper tubing color-coded in Red used in residential and commercial water supply where pressure is not too high is Type __________.

M

Leakages and pilferages in a water supply system should ideally account for no more than __________% of water consumption.

15

In a per capita daily consumption breakdown of $120\,\text{liters}$, toilet flushing accounts for __________% of total water demand.

40

The average daily livestock water demand for each milk cow is __________ liters/day.

133

The formula for projected design population ($P_d$) based on a $3\%$ annual increase over 5 years is $P_d =$__________ \times P$$.

1.15

When calculating design population without explicit data, non-residential projects use an occupant load assumption of __________ square meters per person.

11

The recommended design period for pumps, wells, pipelines, and storage tanks is __________ years.

5

The formula for Maximum Hour Demand (MHD) in liters per second is $\text{MHD} = 3 \times [\text{ADD} \div$__________\,\text{seconds}]$$.

10,800

In a direct water supply system, the pressure at the water main must be at a minimum of __________ kPa.

103

Water Supply Fixture Unit (WSFU) is an index number that uses a lavatory for private use as __________ WSFU.

1

A private-use water closet equipped with a flush tank carries a fixture load of __________ WSFU.

3

A public-use water closet equipped with a flushometer valve requires a minimum pressure requirement of __________ psi.

25

According to PPR PN 20 sizing data, a pipe with a $32\,\text{mm}$ specified outside diameter serves a fixture load of __________ WSFU.

11-25

The usual operating pressure range in a hydro-pneumatic pressure system is $138\,\text{kPa}$ ($20\,\text{psi}$) minimum to __________ kPa ($40\,\text{psi}$) maximum.

276

An above-grade storage tank positioned directly adjacent to the suction end of a booster pump generates a __________ suction head.

positive

An underground water storage container positioned below grade and below the suction end of a booster pump is called a __________ cistern.

break

The capacity of a suction tank ($C_{st}$) in liters is calculated using the formula $C_{st} = \text{ADD} \times$__________$$.

1.03

A conventional air-over-water pressure tank is prone to becoming __________ logged when air dissolves directly into the water.

water

Diaphragm and bladder pressure tanks can withstand operational pressures up to __________ kPa ($125\,\text{psi}$).

862

An air space provided between the maximum water level and soffit of the top slab of a tank is called free board and must be at least __________ mm.

200

The space provided at the bottom of a storage tank to accommodate accumulated silt is called __________ storage.

dead

To determine the elevation head of a gravity tank ($H$) in meters, divide the Design Fixture Requirement in kPa by __________ kPa/meter.

9.81