Piping

Front 1

what should be done if previous records indicate that because of continued deterioration, the thickness of a pipe will drop below the required minimum for safe operation?

Back 1

replace the piping (pipe, valve, fittings)

Front 2

what should be done with piping thinkess inspection reports?

Back 2

they will be maintained by the ship for comparison purposes

Front 3

what material and thickness should replacements for piping systems be?

Back 3

replacements shall be of the same material and thickness as originaly installed

Front 4

minimum wall thickness is calculated using what formula?

Back 4

Tm=(PD)[2(S+YP)]

Front 5

what is PRESSURE VESSEL PIPING?

Back 5

the piping from the pressure vessel drum or header up to and including the first valve off the pressure vessel drum or header

Front 6

what is the PRESSURE VESSEL PIPING referred to as?

Back 6

the BOILER BLOW STOP VALVE

Front 7

what is BLOWDOWN PIPING?

Back 7

the piping from the outlet flange connectionsof the boiler blow stop valves to the outlet flange of the overboard discharge stop valve

Front 8

what is DISCHARGE PIPING?

Back 8

the piping from the flange connections of the overboard discharge valve outlet to the skin of the ship

Front 9

piping replacement should be done before how many months from the date of inspection?

Back 9

should be done at the next availability, but in no case more than 12 months from the date of inspection, when wall thickness is equal to or less than that specified in table 505-1-4.

Front 10

piping must be replaced before what?

Back 10

must be replaced before pressurizing boiler blowding piping if wall thickness is equal to or less than that specified in table 505-1-5

Front 11

replaced sections of piping shall be what?

Back 11

schedule 80 minimum and extend from nozzle to valve for pressure vessel piping and from fitting to fitting for blowdown and discharge piping

Front 12

what material shall piping replacement be composed of?

Back 12

shall be same as currently installed, CARBON STEEL or NICKEL COPPER

Front 13

when may a sectional replacement be made?

Back 13

in an emergency, when complete replacement of a piping run cannot be accomplished due to lack of material or lack of sufficent time

Front 14

what is a SECTIONAL REPLACEMENT?

Back 14

one in which the replaced section of piping does not extend from component to component.

Front 15

what does component to component refer to when dealing with piping?

Back 15

the boiler (boiler blow stop valve) to the sea chest

Front 16

temporary sectional replacements can be made using pipe or tube having different material, size, and/or wall thickness requirements from existing piping.

TRUE OR FALSE?

Back 16

TRUE. however, pipe or tube shall be suitable for use at the existing system pressure and temperature.

Front 17

discharge piping replacement is composed of what?>

Back 17

NICKEL COPPER per MIL-T-1368, class A, schedule 80 minimum. FLANGED NICKEL COPPER valves shall be used

Front 18

what should you do if flanged nickel copper valves cannot be obtained?

Back 18

refurbish and reuse the existing carbon steel overboard, stop-check, and guarding valves until nickel copper ones are obtained. flanges and fittings shall be nickel copper per QQ-N-281, nickel copper alloy bar, rod, plate, sheet, strip, wire, forgings, and structural and special shaped sections.

Front 19

what type of flanges shall be used?

Back 19

SOCKET or BUTT WELDED

Front 20

BIMETALLIC piping shall be joined by what?

Back 20

FLANGES. do not use BIMETALLIC WELDS.

Front 21

what shall be used IN all flanges?

Back 21

SPIRAL-WOUNDS GASKETS, GASKETS, METALLIC-FLEXIBLE GRAPHITE, SPIRAL WOUND and nickel copper fasteners shall be used in all flanges

Front 22

what does MAIN PROPULSION BOILER SOOT BLOWER PIPING consist of?

Back 22

consists of all piping located between the soot blower steam inlet (root) valve and the soot blower heads, including all drain lines,

Front 23

high pressure drain piping is from what source?

Back 23

the source of drainage on the steam system up to the cutout valve downstream of the steam trap (or orifice).

Front 24

in an emergency, when a complete replacement of piping run cannot be accomplished due to lack of material or lack of sufficient time, is it allowable for a sectional replacement to be made?

Back 24

yes, a sectional replacement may be made. the replaced section of piping will not extend from component to component. make the replacement section the same size and material as existing piping.

Front 25

when shall you not perform a sectional replacement?

Back 25

if piping of equal thickness to the originally installed material is not available.

Front 26

what steel pipe bends should be used in a complete system replacement?

Back 26

carbon steel pipe bends of five diameters shall be used in complete system replacements.

Front 27

if space limitations during a complete system replacement require a tighter bend of steel pipe, what should be used?

Back 27

a three-diameter bend radius.

Front 28

with HYDRAULIC TRANSIENTS, why should valves be closed slowly?

Back 28

because sudden stoppage or changes in the velocity and direction of fluids contained in piping systems will generate high pressures that may damage equipment.

Front 29

why should you not start pumps with their discharge valves fully open, when the downstream piping is empty?

Back 29

because thsi avoids high pressure transients that can damage piping and equipment.

Front 30

what actions can minimize piping stresses?

Back 30

closing valves slowly, draining condensate from stream lines before admitting steam, maintaining check valve vacuum breakers in proper operating condition, maintaining hydraulic and pneumatic valve operators to control valve opening and closign rates at specified values.

Front 31

what is WATERHAMMER in service steam systems?

Back 31

characterized by a loud metallic pounding noise.

Front 32

what can cause water hammer?

Back 32

inadequate drainage of condensate or heating the piping too rapidly.

Front 33

where is the material in copper piping weakest?

Back 33

in the vicinity of silver-brazed joints, due to annealing during fabrication.

Front 34

water hammer stress added to normal pressure stress causes what?

Back 34

produces a bulge in the annealed section. bulging may cause piping to become work-hardened, possibly reducing the chance for further bulging.

Front 35

what should piping not be used for to avoid strain?

Back 35

do not use piping as handholds, footholds, or to support weights. applies also to voice tubes, pneumatic tube dispatch piping, and other similar piping.

Front 36

should cross connects between side tanks be kept shut?

Back 36

yes. the list of a ship will be increased by transfer of fluids through open cross connections.

Front 37

what fuel tank sounding tubes are floating ball check valves installed in?

Back 37

installed in fuel, JP-5, and oily waste tank sounding tubes.

Front 38

what kind of tanks do not require floating ball check valves?

Back 38

lube oil tanks

Front 39

what should be done to secured systems, components, and auxiliary equipment and its piping if freezing temperatures occur and such pipings are not protected?

Back 39

they should be completely drained. if necessary, break drain connections to prevent damage due to freezing.

Front 40

when may systems be cross connected?

Back 40

for economy of operation during cruising, or for emergency operation due to equipment casualty or battle damage

Front 41

all steam systems are designed for temperatures above what?

Back 41

77F (fossil fueled ships). main steam system design presure (nuclear power ships) will require level-1 (material control standard) fasteners.

Front 42

what type of fastener can easily be mistaken for steel and should not be used?

Back 42

BLACK OXIDE coated brass.

Front 43

steam for auxiliary service is taken directly from where?

Back 43

the boiler drum internal desuperheater

Front 44

what is installed for where the steam temperature has to be reduced because of limitartions of the service?

Back 44

IN LINE DESUPERHEATERS. installed in conjunction with each pressure-reducing station. some are provided with high temp alarms.

Front 45

why should all valve body drains be left open throughout the warm up period?

Back 45

to permit drainage