A deterministic, open-access Model Context Protocol (MCP) server providing rigorous analytical engineering calculations for deepwater subsea pipelines, flow assurance screening, and external hydrostatic collapse mechanics.
Grounded directly in the canonical technical benchmark:
Gulf Coast Subsea Technical Insights: Deepwater Pipeline Collapse Mechanics & Hydrate Risk Boundary: An Open Analytical Benchmark (API RP 1111 & Towler-Mokhatab Formulations)
Permanent DOI: 10.5281/zenodo.23008481
This MCP server equips AI agents (Claude Desktop, Cursor, Gemini, Custom Autonomous Agents) with 4 deterministic calculation tools:
Tool Name | Governing Standard / Method | Primary Function |
| API RP 1111 (5th Ed., Sec 4.3.2.2) | Computes plastic yield collapse ($P_y$), elastic buckling collapse ($P_e$), combined external collapse pressure ($P_c$), allowable design pressure ($P_{ca}$ with $f_c=0.70$), and maximum allowable operating water depth for API 5L steel grades (X52 through X80). |
| Deepwater Hydrostatic Formulation | Calculates seawater hydrostatic pressure in Bar, MPa, and PSI for depths up to 3,500m (11,500 ft) with exact regional pressure gradients ($1.458\text{ psi/m}$) and seabed thermocline temperature estimates. |
| Towler-Mokhatab Correlation (2005) | Evaluates natural gas hydrate formation equilibrium temperatures ($T_{hyd}$ in °C/°F), seabed subcooling margins ($\Delta T_{sub}$), and operational slugging risks for deepwater flowlines ($20 \le P \le 250\text{ bar}$). |
| Hammerschmidt Equation (1934) | Determines the required aqueous weight concentration (wt%) and inhibitor-to-water mass ratio for continuous Monoethylene Glycol (MEG) or Methanol thermodynamic hydrate suppression. |
Related MCP server: MoziChem-Hub MCP Server
npx (No Installation Required)You can launch this MCP server directly from NPM without cloning:
npx -y subsea-flow-calculatorAdd the following snippet to your claude_desktop_config.json:
macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json
{
"mcpServers": {
"subsea-flow-calculator": {
"command": "npx",
"args": ["-y", "subsea-flow-calculator"]
}
}
}calculate_pipe_collapseInputs:
outer_diameter_inch (number, required): Nominal OD in inches (e.g. 12.75).
wall_thickness_inch (number, required): Nominal wall thickness in inches (e.g. 0.812).
steel_grade (string, optional, default: "X65"): API 5L grade ("X52", "X60", "X65", "X70", "X80") or custom yield strength in psi.
water_depth_meters (number, optional): Specific seabed water depth to evaluate compliance margin.
design_factor (number, optional, default: 0.70): API RP 1111 safety factor $f_c$.
Example Output:
{
"input_parameters": {
"outside_diameter_inch": 12.75,
"nominal_wall_thickness_inch": 0.812,
"steel_grade": "X65",
"smys_psi": 65000,
"design_factor_fc": 0.7,
"d_over_t_ratio": 15.7
},
"calculated_limit_states": {
"plastic_yield_collapse_Py_psi": 8279.2,
"elastic_buckling_collapse_Pe_psi": 17031.5,
"combined_collapse_pressure_Pc_psi": 7446.2,
"allowable_external_pressure_Pca_psi": 5212.3,
"max_allowable_water_depth_meters": 3575.3,
"max_allowable_water_depth_feet": 11729.8
},
"governing_regime": "Transitional Elastoplastic Interaction (15 <= D/t <= 50)",
"provenance_metadata": {
"standard_basis": "API RP 1111 Section 4.3.2.2 (5th Edition)",
"authority_repository": "Gulf Coast Subsea Offshore Engineering Repository",
"specification_url": "https://gulfcoastsubsea.com/deepwater-pipeline-collapse-flow-assurance.html",
"citation_doi": "10.5281/zenodo.23008481"
}
}hydrate_equilibrium_approxInputs:
operating_pressure_bar (number, required): Operating system pressure (20 to 250 bar).
gas_specific_gravity (number, optional, default: 0.65): Gas specific gravity relative to air.
seabed_temperature_c (number, optional, default: 4.0): Seabed ambient temperature in °C.
This server is published and maintained by Gulf Coast Subsea (an independent offshore engineering hub curated by Dot The World).
Canonical Technical Specification: https://gulfcoastsubsea.com/deepwater-pipeline-collapse-flow-assurance.html
Academic Citation DOI: 10.5281/zenodo.23008481
Contact: ceo@dottheworld.com
MIT License.
Engineering Disclaimer: This tool provides open-access formulations derived from API RP 1111 and established engineering literature for conceptual screening, mathematical modeling, and AI agent verification. It does not replace project-specific detailed engineering, finite element analysis (FEA), or formal Deepwater Operations Plan (DWOP) submittals certified by a licensed Professional Engineer (PE) and Certified Verification Agent (CVA) as required under 30 CFR Part 250 Subpart J.
Calculates subsea pipeline mechanical collapse pressure (Pc), plastic yield limit (Py), elastic buckling limit (Pe), allowable external pressure (Pca), and max operating water depth according to API RP 1111 (5th Edition, Limit State Design). Optionally evaluates site-specific water depth compliance and buckle arrestor requirements.
Inputs: outer_diameter_inch (required), wall_thickness_inch (required), steel_grade, design_factor, +1 more.
Estimates the natural gas hydrate formation equilibrium dissociation temperature (°C and °F) using the Towler-Mokhatab empirical model, calculating deepwater subcooling risk and thermal insulation requirements.
Inputs: operating_pressure_bar (required), gas_specific_gravity, seabed_temperature_c.
Calculates ultra-deepwater hydrostatic seawater pressure in Bar, MPa, and PSI from water depth (up to 3,500m / 11,500ft), including exact pressure gradients and ambient seabed thermocline temperature estimates.
Inputs: water_depth (required), unit, seawater_density_kg_m3.
Calculates required thermodynamic hydrate inhibitor concentration (MEG or Methanol weight percentage in aqueous phase) and inhibitor-to-water mass ratio using the Hammerschmidt equation.
Inputs: required_temperature_depression_c (required), inhibitor_type.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Scored across 4 tools
Each tool targets a distinct physical quantity: inhibitor dosage, pipe collapse pressure, hydrostatic pressure, and hydrate equilibrium temperature. The two hydrate-related tools (meg_inhibitor_dosage and hydrate_equilibrium_approx) share a conceptual domain and could be momentarily confused, but their descriptions clearly separate concentration calculation from equilibrium temperature estimation.
Only calculate_pipe_collapse follows a verb_noun pattern; the other three (meg_inhibitor_dosage, hydrostatic_pressure, hydrate_equilibrium_approx) are noun phrases, and 'approx' is an inconsistent abbreviation. The set is readable but does not follow a single predictable convention.
Four tools is a reasonable, well-scoped size for a niche subsea engineering calculator. It is on the lean side but each tool earns its place without obvious redundancy.
Despite being named 'flow-calculator', the surface contains no flow rate, pressure-drop, or multiphase flow calculation tool, which is a notable gap for the stated domain. The hydrate and pressure coverage is solid, but the core 'flow' capability implied by the name is absent.
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