310302 Flashcards by grayson hartwick

What is the error range of a TT that measures from 250 degrees to - 50 degrees. Accuracy is .1%

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4 types of pressure standards and primary or secondary

manometer (P)
deadweight (P)
pressure test guages (2)
pressure calibrator/controller (2)

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Difference in traceability of water triple point and an ice bath?

Triple point provides traceability, ice bath dies not

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How often should you recertify process calibrators?

Yearly

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Multimeters type accuracy in defending order

1)reference standard
2) bench
3) process calibrators

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Who has sole jurisdiction for all trade measurement in the country

Measurement canada

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What does triple point mean?

The temp/pressure at which something can coexist as a solid, liquid and gas/vapor

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What is the triple point of water

.01 degrees science

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This is?

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When should you use a diaphragm seal on a transmitter?

temp outside normal transmitter range
corrosive process
needs sterilization (food, beverage, pharmaceutical)
wet/dry legs not stable or require frequent drain/fill

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3 most common types of radiation

-alpha
-beta
-gamma

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Radiation exposure limit for non nuclear workers

1 milli sievert (mSv)

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Radiation exposure limit for nuclear workers

50 milli mSv per year
OR
100 mSv in 5 years

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This is for

Dose rate of radiation

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This is

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Def isotope

An atom of the same element with a different number of neutrons

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Ultrasonic. What conditions generate a weak signal in liquids? Solids?

Liquids : foam or vapor due to density changes
Solid : small soft particles - tend to absorb the pulse

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Radar: what is thicker 6Ghz or 26Ghz

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On a domed vessel what is the correct way to mount a ultrasonic or radar level sensor?why

Straight up and down and off center.
To avoid parabola effect

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Radar style?

Cone

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Radar style

Rod

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Radar style

Process seal

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Radar style

Horn

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Rsdar style

Parabolic

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Radar style

Still pipe array

Radar/ultrasonic A bypass pipe my also be called: Min diameter?

Bridle Side pipe Cage Chamber 80mm/3 inches

Magnetostrictive instruments work by

Level is calculated by sensing a magnet that goes up and down a shaft

A rotating paddle level detector works how:

Paddle rotates continuously at low speed When it contacts solid material it measures the increase in torque

This is a ? Works by?

Vibrating fork level switch. Measures changes in frequency of the firks vibrations

This is

-Can you mount vibrating forks in material flow? -How do you know if the forks orientation?

-No , unless you install a baffle over it -Index mark on the mounting nut

With a resistance tape level measurement as the level rises the resistance _____

Decreases

4 reasons for flow measurement

- custody transfer - production - safest - process control

These are for :

Liquid flow

This is for

Gas flow

What is the absolute pressure of methane @ 15'c and 700 kPag, Zf = .9042 , Mm = 16.043 and R = 8.3145? Atmospheric pressure 100 kpa

The small s stands for,?

Standard amount of a substance

A master meter is ? Requires?( liquid/gas)

Serves as a reference for proving other meters. It is proved against a traceable standard. It requires dual pulse counters

The most accurate provers for fluids are :

Small volume piston provers

Example of a primary element for differential pressure?

Something that restricts flow to reduce the differential- an orifice plate

Example of a secondary element for differential pressure

A device that measures the differential pressure- a pressure transducer or transmitter

Primary differential elements not including orifice plates are?

- venture tubes - flow nozzles - pilot tubes - annubars - venturi cones

Diff pressure flow nozzles are good for?pressure loss is slightly higher than ____ ___?

High velocity fluid and steam flow . Pressure loss is slightly higher than venturi tubes

A diff pressure pitot tube is good for? It consists of?

Clean liquid and gas processes. An impact tube that receives the total pressure input inside a second tube that measures static pressure through radial sensing holes

And annubar (aka ...) is good for

- area averaging pitot station - measurering large flows of low pressure gasses

Diff pressure venturi cone consists of?

A cone shaped obstruction that the fluid flows around with a pressure sensing tap down stream

VENTURI TUBES : - A control valve should be no more than ____ downstream. - pressure taps are in the center and?

- 2 pipe diamaters -.25 to .5 pipe diameters upstream of the inlet cone

Why are flow nozzles difficult to remove?

They are between flanges

What can you use to shorten the pipe before a nozzle?

Flow straightener or conditioner

Pitot tube's are usually ___ to ___ pipe diameters downstream of a "disturber" and face?

- 10 to 15 - face into the flow

A V cone diff pressure element can be ___ to ___ pipe diameters downstream of a disturbance because?

- 1 to 3 - it causes flow conditioning itself

Why is maintenance of diff pressure elements basically inspecting n cleaning ( not calibrating) ?

Because there are no moving parts

Dc excitation is used in ___ % of magnetic flow meters

Magnetic flow meters: ac excitation is preferred for what conditions:

- large amounts of air are in the process stream - a slurry and solid particles are not uniform - flow pulses at a frequency under 15 hz

How does cathodic protection work on a piping system. Which side should be connected to ground?

The pipe becomes the cathode while another more easily corroded metal becomes the anode. Only the anode should be grounded

When terminating a magnetic flow Metter you should try to keep the unshielded length to less than

1 inch

A turbine flow meters sensor is called?

A pick up coil or pickoff coil

Turbine flow meters: Why are gas ones different from liquid?

The difference in density between the fluids

Why do turbine flow meters use flow conditioning or straightening vanes

Cause swirls / eddy currents in the fluid can cause the turbines to spin at different velocity which affects accuracy

How can gas / air damage a turbine flow meter? How can this be avoided?

When it hits a gas pocket the rotor speeds up, then when it hits the liquid the increased resistance causes immediate slow down Using gas and air eliminators

What does a shedder bar do?

Causes vortices which are timed (frequency) so vortex meters can measure flow

2 ways to calibrate vortex flow meters

- compare to a flow proving device or master meter - use meter verification software

Ultra sonic flow meters - single path reads - dual path reads - 5 path reads

- turbulent flow ( Re over 4000) - transitional and turbulent ( Re 2000 +) - laminar to turbulent

What conditions work best for dappled effect flow meters?

- slurries that contain solids - liquids that contain bubbles - gasses with particles -

310302 Flashcards

(64 cards)