| name | neqsim-water-dewpoint-dehydration-screening |
| version | 0.1.0 |
| description | Educational gas water-content and dehydration screening using the public GPSA Bukacek saturated-water-content correlation. USE WHEN: a task needs a public, screening-level estimate of saturated water content in natural gas and a check against a sales-gas water spec before detailed dehydration design. |
| last_verified | 2026-06-18 |
| requires | {"python_packages":[],"java_packages":[],"env":[],"network":[]} |
Water Dewpoint Dehydration Screening
Use this skill for public, educational gas water-content screening. It estimates the saturated water content of natural gas using the open GPSA Bukacek correlation and compares it to a sales-gas water specification so an agent can flag whether dehydration is likely required before detailed design.
When to Use
- When a user asks whether a gas stream needs dehydration to meet a water spec.
- When an agent needs a quick saturated-water-content estimate to scope a dehydration study.
- When examples must run without confidential dehydration designs, glycol data, or company gas specs.
Inputs
pressure: gas pressure in bar absolute.temperature: gas temperature in kelvin.water_spec: sales-gas water-content specification in lb/MMscf, default 7.0 (common pipeline spec).
Outputs
saturated_water_content_lb_mmscf: saturated water content from the Bukacek correlation.water_spec_lb_mmscf: the supplied water specification.spec_ratio: ratio of saturated water content to the spec.dehydration_required: whether the saturated content exceeds the spec.dehydration_warning: ok, watch, or dehydration-required.assumptions: public assumptions used by the placeholder model.
Engineering Method
The Python class WaterDewpointModel uses the open GPSA Bukacek correlation only:
- the saturated water content uses
W = A / P + B, where A and B are public temperature-dependent terms and P is in psia.
- the spec ratio compares the saturated content to the supplied water spec.
- the warning is a simple rule-based label aligned with sales-gas dehydration intent.
This is educational and screening-only logic. The Bukacek correlation is for sweet natural gas in equilibrium with liquid water and is most accurate above 32 F. It does not include acid-gas corrections, salinity, hydrate suppression, or glycol contactor performance. It is not a replacement for validated water-content and dehydration design (for example GPSA and rigorous thermodynamics) and a qualified process review.
Python Usage Pattern
from water_dewpoint_dehydration_screening import WaterDewpointModel
model = WaterDewpointModel()
result = model.evaluate(
pressure=70.0,
temperature=305.15,
)
print(result.dehydration_warning)
print(result.saturated_water_content_lb_mmscf)
print(result.dehydration_required)
Related NeqSim Functionality
For validated water-content and dehydration calculations, redirect to existing NeqSim functionality:
neqsim.thermo.system.SystemSrkCPAstatoil (CPA equation of state) — rigorous water content and water dew point for natural gas.neqsim.process.design.template.DehydrationTemplate — TEG dehydration process template.neqsim.process.equipment.absorber glycol contactor models — detailed dehydration performance.
This skill is a public Bukacek triage layer that decides when to invoke validated NeqSim water-content and dehydration models.
Validation Checklist
Common Mistakes
| Symptom | Cause | Fix |
|---|
| Water content too low | Acid-gas content ignored | Add CO2 and H2S corrections with a validated method |
| Spec check wrong | Volume basis mismatch (MMscf vs MMsm3) | Keep the water spec on the same basis as the correlation |
| Out-of-range result | Temperature below the correlation range | Use a validated method below freezing or near hydrate conditions |
Limitations
- No proprietary dehydration designs, glycol data, or company gas specs are included.
- No acid-gas, salinity, or hydrate-suppression corrections are performed.
- No glycol contactor or regeneration performance is modeled.
References
