Instrument Hook-up Diagrams Quiz: Test Your Project Engineering Knowledge

Gauge snubbers smooth pressure pulsations, protecting gauges from rapid fluctuations that could damage them.

Diaphragms protect instruments by isolating them from aggressive process fluids that might damage them.

Solid lines generally represent process connections, showing how instruments link to the process system.

Stainless steel resists corrosion, a crucial feature for longevity in harsh process environments.

Condensate pots collect liquids in gas service, preventing them from reaching pressure instruments.

Stainless steel resists corrosion, making it a durable choice for tubing in aggressive environments.

Explanation: Root valves are the closest shutoff valves to the instrument, allowing isolation from the process line.

The check valve symbol typically includes a triangle with a line across to indicate unidirectional flow.

Tubing connects process points to instruments, ensuring accurate measurement of fluid parameters.

Steam jackets keep the process fluid warm, especially when it could solidify or become viscous at lower temperatures.

Loop drawings offer foundational information about instrument connections needed for hook-up diagrams.

Equalizing valves balance pressures on both sides of a differential pressure transmitter for accurate measurements.

Glycol in impulse lines prevents process fluids from freezing in cold environments, ensuring accurate measurements.

Compression fittings provide leak-resistant seals, making them suitable for high-pressure applications.

Bleed valves allow trapped air to be released, preventing inaccurate readings in pressure applications.

Flexible tubing absorbs vibrations, protecting sensitive instruments from damage.

Hook-up diagrams are often cross-referenced with P&IDs to ensure all connections are accurate during commissioning.

Purge points help prevent solids buildup, ensuring accurate measurements in lines carrying process fluids.

Thermowells protect temperature sensors from direct contact with process fluids and help with maintenance.

Hook-up diagrams focus on instrument connections and process details, not broader electrical layouts like cable trays.

ANSI/ISA-5.4 standardizes loop and hook-up diagrams, ensuring consistent documentation.

Drain valves allow trapped liquid to be removed, preventing inaccurate measurements in pressure instruments.

Root valves are installed close to the process and isolate instruments from process fluid during maintenance.

Manifolds, such as 3- or 5-valve manifolds, allow isolation of the transmitter for maintenance and calibration.

Instrument hook-up diagrams are essential for accurately showing how instruments connect to the process equipment, ensuring proper installation and operation.