CM 2103 Practice Quiz

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Lead is a strong material @ high temperature

FALSE

Stainless steel is resistant to rusting but not corrosion

FALSE

Trepanning is not used to inspect the welding on new storage tanks or similar equipment

FALSE

Bronzes are from the family of copper alloys

TRUE

The chemical industry has two methods to prevent fire hazards from static electric sparks: bonding and grounding

TRUE

pipe is also sometimes specified as STD, XS, XXS

True

XS pipe is extra small

false

a double block and bleed system is considered a complete shutoff

false

a socket weld is made by joining the ends of two pipes together

false

brass is stronger than steel

false

bronze alloys contain 90% or more aluminum

false

butt-welding is not often used in industrial construction

false

corrosion is not a major issue for process plants

false

in a butt-weld, one pipe is inserted into a larger fitting and welded

false

low carbon steel is not a very satisfactory material for most plant applications due to its high price

false

nominal pipe sizes are usually the same as their actual inside or outside diameters

false

nonferrous alloys contain large amounts of iron

false

piping of the same size (all 4" pipe) has a constant inside diameter

false

process equipment is designed exactly for normal operating pressure

false

schedule 10 pipe is considered heavy wall pipe

false

steels that contain 10% or more of alloys, metals called low alloy steels

false

strength of metals increases as temperature increases

false

O.D. = I.D. + 2 x wall thickness

true

Underground water pipes can function as a grounding device

true

a 3" schedule 40 pipe will have a different wall thickness than a 4" schedule 40

true

a paddle blind is inserted between 2 flanges, with a gasket on each side, while a figure-8 blind is designed to be installed inside the piping

true

a thread compound or teflon tape is used on screwed joints for lubrication and to aid in sealing the joint

true

aluminum and silicon bronzes are more resistant to salt water

true

as operating temperature increases above 650 degrees F, the strength of low carbon steel decreases, becoming significant between 950 deg F to 1000 deg F

true

besides effecting strength, temperature has a profound effect on corrosion rates

true

blocking is equipment unprotected by relief valve can exceed design conditions and cause failure

true

brass & bronze are from the family of copper alloys

true

brass is a term used to describe a family of alloys of copper and zinc

true

brass loses significant strength when heated

true

brasses are widely used b/c of their resistance to corrosion from water containing various impurities that are corrosive to steel

true

cathodic protection systems can protect equipment indefinitely as long as sacrificed anodes are replaced and current flow is open

true

flammable liquid containers can build up static charges as material is pumped in

true

flanges are made in various thicknesses and for various bolt sizes according to the pressure and temperature of the service

true

measuring wall thickness through drilled holes, called trepanning, is the most accurate method when transfer calipers cannot be used

true

most piping used in process unites is carbon steel, bc it is fairly economical and has a wide temperature range

true

nickel alloys used for processes that involved acids & caustics

true

pipe fitting ratings of 150lb, 300lb, 600lb are common in chem plants

true

piping of same size has a constant outside diameter

true

piping w/ threaded joints is generally much less expensive and easier than welded joints

true

raised face flanges use a gasket that fits inside the bolts and ring joint flanges use only a metal ring for gasketing

true

screwed piping joints are tapered to provide a tight fit

true

screwed piping used in sizes up to 2" for handling nonhazardous materals

true

small pipes are commonly joined by the use of tapered pipe threads

true

socket-welded fittings are usually used in 2" size & smaller; butt-welded piping is used in all, particularly 2" and larger

true

some low alloys (carbon, moly-,chrome) are used in high temperature such as furnace tubes

true

stress corrosion cracking and a high coefficient of expansion are two conditions that cause stainless steel to deteriorate

true

the material used in piping construction are chosen to withstand the temperature, pressure, and other properties of the fluids conveyed

true

the most common composition of stainless steel is referred to as 18-8, has 18% chromium and 8% nickel

true

the pipe wall thickness increases as schedule # increases

true

the weakest part of screwed piping is usually the joints

true

to secure the strength and oxidation resistance of low carbon steel @ high temperatures, small amounts of alloying elements are added

true

two methods of cathodic protection are using sacrificial anodes and using impressed current anodes

true

visual inspection is the most usual method of inspection

true

when stainless steel is heated, it expands at a rate 150% of that of steel, which becomes a problem whenever stainless steel is used in close contact with other metals

true


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