Installing field mounted instruments (12213-15)

Most industrial process field instruments are mounted on what?

instrument pipe stands

Instrument pipe stands can also be referred to as?

stanchions

What size and type mounting is the instrument pipe stand built to provide?

2" (DN50)

Some instrument stands or supports can be welded together at what kind of angle to be able to support two instruments?

45°

When fabricating a instrument floor stand what is the first step?

marking and cutting the three sections of piping required for the top of the stand

How do you identify the center line of the pipe?

quartering and marking the pipe

When securing a stand to concrete floors and the precise location is not shown on the drawings, you should locate the stand so that it is convenient to what?

primary element point in or on the process

When trying to pick a location for a stand to be secured to concrete floors, that location should not interfere with what?

plant operation or personnel

What is the most common way instruments are mounted onto pipe stands?

mounting bracket with a U-bolt, two lock washers, and two nuts

What are the three types of orifice plates? Know the difference when looking at them

concentric, eccentric, segmental

In one of the laws of electricity, more specifically Faraday's law of magnetic induction, what does it state?

voltage will develop in a conductive liquid moving through a magnetic field

What kind of flowmeters measure flow by directly dividing a stream into distinct segments of known volume, counting segments, and multiplying by the volume of each segment?

volumetric or positive displacement (PD) flowmeters

What kind of flowmeters are widely used in liquid processes where accuracy is crucial?

rotary-vane flowmeters

What kind of flow meters are typically used with very viscous liquids?

oval-gear flow meters

What kind of flow meters can measure flow through the tube in either the forward or reverse direction. If the design contains two parallel tubes, flow is divided into two separate streams by a simple splitter located near the meter inlet?

coriolis flow meters

What is also considered a variable-area flowmeter?

rotameter

What are liquids often measured in terms of?

density

The measurement of liquids is often expressed in terms of specific gravity which is the ratio of the density of the measured substance to the density of what?

water

What is the specific gravity of water?

1

Level instrumentation probes must not be allowed to come into contact with vessel walls or what will happen?

false readings will occur

When dealing with a capacitance probe (RF probe), what creates the change as it rises or falls, causing the capacitance to vary in proportion to the level?

liquid level in the tank

Controlling pH depends on what? and involves supplying the proper amount of what to adjust the pH to the desired value?

measurement reliability, reagent

What type of instrument operates on the principle of buoyancy?

displacer type level instrument

What is buoyancy?

upward pressure that acts on a floating object

Wha does cable mounted assemblies usually come with?

a base and a cable assembly

What can be used to measure levels in a tank and the density of material?

radiation detector

What is able to sense temperature, and control equipment to maintain temperature within a specified band?

thermostats

Where is the best position to mount the sensing bulb or a sensor on lines ?

where liquid is most likely to accumulate

What is a rugged cast aluminum or cast iron unit with a screw cover and is used commonly with thermocouples and RTDs?

weather proof head or connector head

What sensor material is the best performance wise when it comes RTD's?

platinum

Many multiport valve assemblies are designed withwhat type of valve?

equalizer valve

Using an equalizer valve, when opened, allows the high side and the low side to equalize in pressure. This convenient method allows for what?

quick zeroing of the instrument

What do some manifold manufacturers use on manifold valves to help visually identify the valves purpose?

color coded bands

What color band on a manifold valve indicates that the valve isolates the instrument from the process lines?

blue

What color band on a manifold valve indicates it is a equalizing valve?

green

What color band on a manifold valve shows that is designed for testing, draining or bleeding off pressure?

red

The five valve blow down manifold combines what kind of valves?

three valve equalizing manifold with two special blowdown valves

Needle valves have what kind of seats, and because of the angular flow passage through the valve, it has a higher resistance to what?

tapered stem seats, flow

What type of valve is much better suited for fine flow control?

needle valve

Futbol flange adapters are shaped like what?

oval like footballs

When talking about flange sizes BC stands for?

bolt center dimension or bolt circle

This of a flange is a standard number used to describe the strength of the flange?

primary pressure rating

When talking about flange pressure ratings, As temperature (BLANK) , the pressure rating (BLANK)

increases, decreases