Piezometer Ring Components¶

Run the Piezometer Ring Components MicroSim Fullscreen

About This MicroSim¶

This MicroSim puts ten numbered markers on FanPedia's drawing of the piezometer ring components on a fan inlet funnel (page 158). A piezometer ring is part of an airflow measuring system based on the principle of a flow nozzle, and the fan's own inlet funnel is the nozzle. The main drawing shows the funnel with the ring tubing around its throat, the tubing that runs from the ring to the low pressure tap, and the loose tubing and tap fittings beside the funnel. Three close-ups below it show the union tee, the two tap fittings and a coupling with its rivnut.

The ten components are the inlet funnel, tubing around the throat, couplings with "T" fittings, union tee, tubing to low pressure tap, tubing to high pressure tap, low pressure tap fitting, high pressure tap fitting, hanger clip and rivnut. On a wide screen a label column with leader lines sits to the right of the drawing; on a narrow screen the labels move below it as a numbered list. Where a component is small (the hanger clip, the two tap fittings, the coupling and the rivnut), its marker sits beside it with a short pointer to the component.

The quiz describes each component by its job ("Select the part the system uses as its flow nozzle.") instead of naming it, in a shuffled order. You get two attempts per prompt. The first wrong answer shows a hint about where to look; the second reveals the component and counts as missed. Mastery is 8 of 10 correct on the first attempt. Explore mode is never scored.

How to Use¶

Explore mode (the starting mode). Point at a numbered marker, or Tab to it, to see the component's name and description in the panel below the drawing. Click it (or press Enter) to open it; opened components get a ✓ in the label list and the counter shows how many of the 10 you have visited. Clicking a name in the label list opens that component too.
Quiz mode. Press Quiz. The labels and leader lines disappear and a prompt describes one component:
- Correct: "✓ Correct:" with the component name and its description; the marker turns green with a ✓ badge and its label comes back.
- Wrong on the first attempt: "✗ Not quite.", the name of the component you picked, and a hint. The hint never names the answer.
- Wrong on the second attempt: the answer is marked "Answer" and named, and the prompt counts as missed.
Press Next prompt after each answer. The toolbar shows "Parts correct: n of 10".
After the tenth prompt, the summary shows your first-attempt score, whether you reached mastery (8 of 10), and each missed prompt with its answer. Retry missed practises only the misses (not scored), Start over reshuffles and resets the score, and Back to explore returns to the labels.

Keyboard: Tab moves through the markers in number order and then the buttons; Enter or Space selects a marker. After an answer, focus moves to Next prompt, so Enter goes on.

Data label: "Drawing: FanPedia, Twin City Fan, p. 158", shown under the drawing.

Iframe Embed Code¶

You can add this MicroSim to any web page by adding this to your HTML:

<iframe src="https://moroshek.github.io/FanTASTIC-textbook/sims/ch23-piezometer-ring-overlay/main.html"
        height="867px"
        width="100%"
        scrolling="no"></iframe>

Lesson Plan¶

Learning Objective¶

The learner will identify the ten labeled components of a piezometer ring airflow measuring system on a fan inlet funnel, given each component's function or location (Bloom: Remember, verb: identify).

Audience¶

Adult professional development: new application engineers, sales staff, representatives and facilities staff.

Duration¶

10-15 minutes

Prerequisites¶

Chapter 22, section "Installation Accessories: Weather Cover, Zero Speed Switch, Piezometer Ring" (what a piezometer ring is and which fans offer it).
Chapter 23, section "Measuring Airflow in the Field" (the inlet funnel as a flow nozzle and the high- and low-pressure sides).

Activities¶

Explore (4 min): Open all ten components. Trace the two pressure paths aloud: the throat pressure from the tubing around the throat, through the union tee and the tubing to the low pressure tap, to the low pressure tap fitting; and the face pressure, which leaves through the high pressure tap fitting and the tubing to the high pressure tap.
Sort (2 min): Group the components into tubing (three runs), fittings (couplings, union tee, the two tap fittings) and mounting hardware (hanger clip, rivnut).
Quiz (5 min): Switch to quiz mode and find all ten components from their jobs without going back to explore mode.
Review (3 min): Read the missed list, open those components in explore mode, then press Start over for a new order.

Common Misconceptions Addressed¶

A piezometer ring is a separate flow meter added to the duct: the fan's own inlet funnel is the flow nozzle, and the ring is tubing around its throat.
Both pressures are taken in the throat: the high pressure tap is on the face of the funnel on the inlet side; only the ring senses the throat.
The ring connects to the high-pressure side because it is the measuring ring: the air speeds up in the throat, so the ring's pressure is the lower one and it goes to the low-pressure side.

Assessment¶

First-attempt score shown in the summary as "First-attempt score: n of 10"; mastery is 8 of 10 on the first attempt.
Pointing at markers and opening infoboxes in explore mode is exploration, not evidence.
Follow-up question: a fan's inlet runs above 180°F. Which component on this drawing changes material, and to what?

References¶

FanPedia: The Fan & Blower Encyclopedia (PDF) - Twin City Fan; p. 158 is the piezometer ring overview and inlet funnel components drawing used here, p. 160 covers pressure transmitters and installation manual IM-105, and p. 191 is the piezometer ring description.
FanPedia online - Twin City Fan's online version of the encyclopedia.
Chapter 23: Spring Isolators, Restraints and Field Measurement - the section "Measuring Airflow in the Field", where this MicroSim is embedded, and the flow equation for the inlet funnel.
Chapter 22: Fan Bases and Vibration Isolation - the section "Installation Accessories: Weather Cover, Zero Speed Switch, Piezometer Ring", which introduces the piezometer ring.