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relief-system-designer skill

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This skill assists designing pressure relief systems by sizing devices, calculating relief loads, and optimizing flare and disposal design per API standards.

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---
name: relief-system-designer
description: Pressure relief system design skill for PSV sizing, flare header analysis, and overpressure protection
allowed-tools:
  - Read
  - Write
  - Glob
  - Grep
  - Edit
  - Bash
metadata:
  specialization: chemical-engineering
  domain: science
  category: Process Safety
  skill-id: CE-SK-016
---

# Relief System Designer Skill

## Purpose

The Relief System Designer Skill designs pressure relief systems including PSV sizing, relief load calculations, and disposal system design per API standards.

## Capabilities

- Relief scenario identification
- Relief load calculations
- PSV sizing (API 520/521)
- Flare header hydraulics
- Blowdown system design
- Two-phase relief calculations
- Reactive systems relief
- Relief device selection

## Usage Guidelines

### When to Use
- Designing pressure relief systems
- Sizing relief devices
- Analyzing flare headers
- Evaluating relief scenarios

### Prerequisites
- Process conditions defined
- Relief scenarios identified
- Physical properties available
- Design codes specified

### Best Practices
- Consider all credible scenarios
- Use appropriate methods for two-phase
- Account for backpressure
- Document all assumptions

## Process Integration

This skill integrates with:
- Pressure Relief System Design
- Safety Instrumented System Design
- HAZOP Study Facilitation

## Configuration

```yaml
relief-system-designer:
  design-codes:
    - API-520
    - API-521
    - API-526
  relief-scenarios:
    - fire
    - blocked-outlet
    - control-valve-failure
    - runaway-reaction
```

## Output Artifacts

- Relief calculations
- PSV datasheets
- Flare load summaries
- Header sizing calculations
- Disposal system design

Overview

This skill designs pressure relief systems for process plants, covering PSV sizing, relief load calculations, flare header analysis, and disposal system design per industry practice. It produces calculational outputs and datasheets that support safety reviews and code compliance. The goal is to turn defined process conditions and scenarios into auditable relief-device and header designs.

How this skill works

The skill ingests process conditions, physical properties, and identified relief scenarios, then applies accepted methods (API 520/521 principles) to compute relief loads and select devices. It performs single- and two-phase relief calculations, evaluates backpressure and flare header hydraulics, and generates PSV datasheets and flare load summaries. Outputs include calculation trails and assumptions to support verification and safety studies.

When to use it

During initial relief system design and later detailed sizing
When sizing or selecting PSVs and rupture devices
To analyze flare header hydraulics and assess backpressure impacts
For blowdown and disposal system design and validation
While preparing inputs for HAZOP, SIL, or safety case reviews

Best practices

Define and document all credible relief scenarios before calculations
Provide accurate physical properties and transient parameters for two‑phase cases
Include upstream and downstream backpressure effects in header analyses
Use conservative assumptions for emergency scenarios and clearly record them
Cross-check results with applicable code clauses (e.g., API 520/521) and peer reviews

Example use cases

Size a PSV for a vessel subject to fire and blocked outlet scenarios
Compute combined relief load for multiple sources discharging to a common flare header
Design a blowdown disposal system for emergency depressurization
Evaluate two‑phase relief cases for depressurizing hydrocarbon systems
Produce PSV datasheets and header sizing calculations for safety documentation

FAQ

What inputs are required to run a sizing analysis?

Process conditions, composition and phase behavior, relief scenario definition, piping geometry for headers, and applicable design codes are required.

Does the skill handle two‑phase relief calculations?

Yes. It supports two‑phase and flashing-liquid methods, but accuracy depends on the provided thermodynamic data and chosen modeling approach.