Ammonium Nitrate Solution Process Overview

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Questions and Answers

What is the primary purpose of adjusting the strength of ammonium nitrate solution in Tank 5?

To enhance the reaction rate in chemical processes

To reduce the strength to 87.5% for subsequent use (correct)

To increase the production capacity of the plant

To improve the stability of the solution during storage

How is the dosing of weak ammonium nitrate solution controlled in Tank 5?

By manual operation of shutoff valve X1

Using a feedback mechanism from the density meter (correct)

Through a constant flow rate established by the pump

Based on a predetermined schedule set by operators

What happens if the density meter AE XXX fails?

The ammonium nitrate solution will become unstable

The dosing valve will remain open indefinitely

The strength of ammonium nitrate solution is increased

The system will not adjust the strength properly (correct)

What is the function of the jet mixer and circulation line in Tank 5?

To ensure adequate agitation for uniform mixing Signup and view all the answers

What is the failure mode of the dosing control valve X1?

Fail Closed Signup and view all the answers

What determines the duration the shutoff-dosing valve X1 remains open?

Timer to avoid excessive dosing and allow mixing Signup and view all the answers

What is the role of the density meter AE XXX in the tank system?

To measure the strength of the ammonium nitrate solution Signup and view all the answers

What is one of the interlock conditions for valve X1?

No pump is allowed in operation without feedback Signup and view all the answers

What are the two modes of operation for the valve?

Auto and Manual Signup and view all the answers

What is the set point for concentration in Tank 5?

87.5% Signup and view all the answers

What input variables are used to control the dosing of ammonium nitrate solution?

Density and Temperature Signup and view all the answers

What response occurs when there is a high concentration in Tank 5?

X1 opens and doses on a timer before closing Signup and view all the answers

What happens if the valve fails to respond during dosing?

Dosing of ANSSER solution stops Signup and view all the answers

What concentration of ammonium nitrate solution is used for dosing?

30% to 50% Signup and view all the answers

Which of the following best describes the operation philosophy for Tank 5?

Automated operation using timers and manual overrides. Signup and view all the answers

What is the main goal when X1 opens and doses ammonium nitrate solution?

To achieve a uniform mixture Signup and view all the answers

Study Notes

Ammonium Nitrate Solution Process

Ammonium Nitrate Solution (ANS) is produced by either ANS 1 & 2, reaching a strength of 90% to 94% m/m.
ANS is pumped to Tank 5 with the intention of reducing the strength to 87.5%.
ANS is then pumped to the Tank Farm for use in Emulsion or ANS sales.
ANS in Tank 5 is adjusted using weak ammonium nitrate solution dosed into the tank.
Dosing rate is controlled by a shutoff valve (X1) based on feedback from a density meter (DT-XXX).
The valve (X1) opening duration is time-based to prevent over-dosing.
Tank 5 mixes effectively with the weaker solution to create a uniform mixture.
A jet mixer and circulation line aid in tank content agitation.

Control Instruments

AE XXX (Density Meter): Measures the ammonium nitrate solution strength in Tank 5.
- Failure mode: Fail Low.
- No interlock.
X1 (Dosing Control Valve): Controls the dosing of weak ammonium nitrate solution into Tank 5.
- Failure mode: Fail Closed.
- Interlocks:
  - Tank 5 High Level
  - No pump in operation feedback

Control Philosophy

The goal is to maintain an ammonium nitrate concentration of 87.5% in Tank 5.
This is achieved by dosing weak ammonium nitrate solution.
Control is based on density and temperature measurements.

Control Scenario Planning

High Concentration in Tank 5:
- Response: Valve (X1) opens and dosses on a timer, closing to prevent overdosing. Once uniform mixture is achieved, the solution can be exported.
- Failure to Respond: Fail-closed valve prevents dosing due to no ANSSER solution being added.

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Description

This quiz covers the process of producing and adjusting the strength of Ammonium Nitrate Solution (ANS) using different control instruments. Learn about the procedures involved in the tank adjustments and the control systems that ensure proper dosing and mixing. Ideal for those studying chemical engineering and process management.