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68 Cards in this Set

  • Front
  • Back

What is the correct ratio of water to air in a standard pressure tank?

⅓ air to ⅔ water.

A standard galvanized pressure tank that has lost its charge is said to be?


A standard galvanized pressure tank that contains 33.3% air and 66.6% water will release 20% of its water before the pump must start again. This volume of water is called what?

Usable water

An installation that requires air to be replenished in the pressure tank requires an air volume control. The two most common types of air volume control are what?

The float type and the diaphragm type.

The electrical device that turns the on and off is called?

A pressure switch

What type of Interceptor uses a baffle?

Grease interceptor

What type of interceptor requires an orifice plate?

Grease interceptor

What type of interceptor would be required for a dental office?

Solid interceptor

What principle is used in the separation of oil or gas from wastewater?


What are the three main styles of grease interceptors?

Recessed, semi recessed, floor-mounted

What is the chemical classification of an enzyme?


To size a grease trap you would use?

The volume of the sinks.

For a grease interceptor to serve as a trap for a fixture it must have?

An 1½" trap seal

The minimum size vent on an oil interceptor?


The proper method of disposing of grease removed from an interceptor is to?

Send it to a compost facility.

Interceptors should be cleaned?

On a regular schedule

What is the minimum size of an air break for an indirect connection?

At least equal the size of the fixture drain, branch or pipe that terminates above the directly connected fixture and shall not be less than 25mm (1").

What term is used to describe how many milligrams of a substance in one liter of water?

P.p.m can also be expressed as mg/l

What are the five most common characteristics of water?

Turbidity, temperature, taste, color and odour. Pure water should be tasteless and odorless.

What three categories can water quality be placed in?

Physical, biological and chemical

Biological consists of

Living organisms found in the water.

Chemical characteristics consist of?

Chemical elements found in the water such as gases like oxygen and carbon dioxide, salts, nitrates, phosphates and naturally occurring chemicals such as iron or manganese. These chemicals can be responsible for staining clothes and plumbing fixtures.

What is the acceptable pH range for drinking water?

6.5 and 8.5

Hardness impurity is defined as calcium and magnesium salts in a solution. Most homes have ??

3 gpg to 50 gpg (grains per gallon) 1 grain per gallon equals 17.1 p.p.m

The three types of hardness found in water are ?

total hardness, temporary hardness and permanent hardness.

Hardness of ______ is unpleasant for human consumption and hardness should not exceed ________ for household consumption?

12gpg is unpleasant and 3.5 gpg should not be exceeded

The hardness chart is?

Less than 1 gpg is soft, 1 to 3.5 is slightly hard, 3.5 to 7 is moderately hard, 7 to 10.5 is hard and more than 10.5 is very hard.

What three types of iron classification can be found in water?

Ferrous (commonly found in well water, is drawn from the tap looking clear but begins to turn rusty after oxygen exposure.)

Ferric (come out of the tap rusty and stays that way)

Bacterial is less common and is a living organism that feeds on iron and shows up as a slimy growth.

What is the acceptable iron content for drinking water?

No greater than 0.3 p.p.m

Above what ppm would you want to find a new well? And above what level would it be every costly to treat?

Above 50 p.p.m you would find a new well and above 35 p.p.m would be very costly to treat.

How is a pump able to lift water from a well?

By creating a partial vacuum in the pumping chamber.

How does the diameter of a well affect pumping capacity?

By limiting the size of pump you can install.

What is the maximum theoretical lift of a centrifugal pump used as a suction pump?

Close to 34 feet

Why is a jet pump capable of greater suction lift than a centrifugal pump? Jl

Jet pumps are better at developing negative pressure than centrifugal pumps.

What is the difference between a shallow well and a deep well?

Depth to the pumping level of the well.

How does altitude of a pump installation affect pump selection and installation methods?

Higher elevations do not have as much atmospheric pressure.

How does friction loss affect the use of a suction pump?

Pump is working at maximum lift capacity.

Why are centrifugal pump suction lines installed with positive grade from the well to the pump inlet?

For better air elimination when pumping

How may drawdown in a well affect an aquifer?

Drawdown can allow the aquifier to start releasing sand.

Why should pump capacity be matched to well capacity?

To prevent aquifier problems from developing.

When is a well considered a deep well?

When the well is deeper than 24 feet.

Why are some jet pumps called convertible jet pumps?

The jet assembly can be removed from the pump and placed in a well.

What piston pu.p can be offset from the top of the well?

Shallow well piston

Which pumps may produce enough pressure to damage a pressure system?

Reciprocating and submersible pumps

What are helical scree pumps usually used for ?

Pumping slurries and sludge

When a shut off valve is placed on a tank the for a residential installation which side of the tank should it be placed on?

Outlet of tank tee

What is the pressure output of a submersible pump impeller stage?

9 psi per stage

Why does a submersible pump require a check valve at its outlet?

To stop water from draining out of the drop pipe through the pump.

What types of impellees are used on centrifugal pumps?

Closed, semi closed and open

What device is used on the outlet of two pipe jet pumps to allow the pump to produce the most water possible?

A flow fitting or valve

What are the three most common materials used to make septic tanks?

Concrete, polyethylene and fibreglass

The operation of solids within a septic tank occurs by?

Floatation and settlement

What type of bacteria action occurs within a septic tank?

Anaerobic bacteria

When a septic chamber is designed for effective separation of sewage, the length should be how many times the width?

2 to 3 times

Water treatment falls into seven categories, they are?

Basic filtration, in exchange, oxidization, neutralization, chlorination, reverse osmosis, distillation and ultraviolet sterilization.

What type of filter is used for point of use applications for removal of sediment?

Cartridge filters

What type of filter is used for point of entry applications for the removal of sediment?

Tank type sand filters

Resins used within ion exchange units can be designed to provide ______ (positive charged ions) exchange and ________ (negatively charged ion) exchange.

Cation (positive charged ions) and anion (negatively charged ions)

What material is commonly used in an absorption type filter to attract and hold tastes and odours?

Activated carbon

Zeolite resins I'm a water softener are designed to attract hardness ions such as _______ and ___________ ions. The resulting exchange process releases relatively harmless _______ ions.

Calcium and magnesium ions. Releases sodium ions.

An alternative to sodium salt for a brine solution is the use of ???

Potassium salt solution

Oxidization is a very effective method of removing _____ iron, ______ and ______ _______ from solution.

Ferrous iron, manganese and hydrogen sulphide.

The oxidizing agent used in manganese Greenland filter is ________ __________ and the chemical symbol for this material is?

Potassium permanganate and KMnO⁴

What is used in conjunction with a chemical free iron filter to add air to the water supply?

A hydrocharger

To increase the pH level of the raw water supply with a pH between 6.0 and 6.9 the proper filter to use is _________. This type of filter requires the addition of _________ ___________ to replenish the filter bed.

Neutralizing filter, calcium carbonate

In extreme cases when water has a pH level between4.0 and 6.9 what is fed using a metering pump?

Soda ash

Reverse osmosis works by a process known as?

Membrane separation

Residential reverse osmosis units are designed for ?

Point of use applications