13 Integrated Calculation Modules
Shell, bottom, roof, wind stability, wind girder, seismic, anchorage, external pressure, weights, nozzle weights, foundation load, and summary — all connected, all in sync.
API 650 Compliant · Multi-Standard · Browser-Based
Professional
Tank Design
in Your Browser
TankCode 650 is a full-scope API 650 calculation platform for structural and process engineers. 13 integrated modules. Multi-edition support. Stamp-ready PDF reports.
13
Calculation Modules
3
API Editions
4
Seismic Methods
2
Unit Systems
Standards & Integrations
Internationally recognised codes. Full traceability.
Every formula references its source clause. No black boxes — every intermediate value is visible from input to stamped output.
Tank Design
API 650
Welded Tanks for Oil Storage
11th Ed.
13th Ed.
14th Ed. ✓
Appendix E
Seismic Design of Storage Tanks
Appendix F
Frangible Roof Joint Design
Seismic
ASCE 7-10
Spectral maps · API 650 11th/12th Ed.
ASCE 7-16
Spectral maps · API 650 13th/14th Ed.
IS 1893 Part-2
Indian seismic · IITK-GSCDMA guidelines
Site Spectra
Direct Sai / Sac spectral acceleration input
Wind
IS 875 Part-3
Indian wind loads · k1 · k2 · k3 terrain & risk factors
ASCE 7 Wind
Exposure categories · Kz · Kzt · Kd factors
Wind Girder
Intermediate & top wind girder sizing per API 650 §5.9
Stability Check
Overturning, sliding & uplift resistance verification
Integrations
AVEVA E3D PML
3D plant design scaffold export for tank geometry
ASME B16.5
Pipe flanges & flanged fittings — nozzle weight tables
ASME B36.10M
Welded & seamless pipe — nozzle weight schedule
PDF Reports
Stamped engineering output — clause-referenced calculations
Why TankCode 650
Every tool an API 650 engineer needs
From initial geometry to stamped PDF — no switching between spreadsheets, manuals, and disconnected tools.
Multi-Edition API 650 Support
Switch between 11th, 13th, and 14th Editions instantly. The engine applies the correct clauses, tables, and ASCE version automatically — no manual adjustment.
4 Seismic Design Methods
ASCE 7-10, ASCE 7-16, IS 1893 Part-2, and Site Spectra — all per API 650 Appendix E two-mass impulsive/convective liquid model.
Stamp-Ready PDF Reports
One-click generation of full engineering reports with clause references, intermediate values, and PASS/FAIL status for every design check — ready for client submission.
Interactive 3D Tank Model Viewer
Visualise your tank geometry in real-time 3D — shell courses, roof, nozzles, anchor chairs, wind girders, and stiffeners rendered isometrically as you design. Instant geometric validation.
Dual Unit System — SI & USC
Full metric SI and US Customary support with field-level unit switching. Backend stays in SI — all conversions at the UI layer — ensuring calculation accuracy regardless of display unit.
AVEVA E3D PML Export
Export tank geometry directly as PML scaffold for AVEVA E3D plant design integration — bridging API 650 calculation with 3D plant modelling workflows.
Multi-User Enterprise Access
Admin-managed registration, JWT authentication, trial and licensed tiers, per-user calculation history, and rate limiting — enterprise-ready from day one.
Calculation Modules
Every API 650 design check. One platform.
Each module is independently verified against API 650 clause references and cross-linked — change one input and every downstream check updates instantly.
Shell Design
Course-by-course shell plate thickness per API 650 § 5.6.3. Supports one-foot method and variable-point method, up to 12 courses with individual material, corrosion allowance, and joint efficiency.
- One-foot and variable-point design methods
- Per-course material: A36M, A516 Gr.55/70, A537 CL1
- Corrosion allowance per course
- Course height: 1000–3000 mm customizable
- Radiography basis: full, spot, none
API 650 § 5.6.3 / § 5.10
Bottom Plate & Annular Ring
Bottom plate and annular ring design per API 650 § 5.9. Minimum thickness, annular width, and junction adequacy based on shell material and loading.
- Minimum bottom thickness per Table 5-1a
- Annular ring width and thickness sizing
- Separate corrosion allowance
- Shell-to-bottom junction check
API 650 § 5.9 / Table 5-1a
Roof Design
Fixed-roof design per API 650 § 5.10.2. Self-supported cone and dome, Appendix F frangible joint design, 11 junction Figure F-2 types, and supported roof rafter sizing.
- Self-supported cone and dome configurations
- Appendix F frangible joint (11 junction types)
- Supported roof rafter and ring beam
- Snow and live load inputs
- Roof-to-shell compression area check
API 650 § 5.10.2 / Appendix F
Wind Stability & Wind Girder
Wind overturning and sliding stability per API 650 § 5.11. IS 875 and ASCE 7 wind methods with multi-elevation load integration and intermediate wind girder sizing.
- IS 875: k1/k2/k3 risk and terrain factors
- ASCE 7: Kz, Kzt, Kd exposure factors
- Multi-elevation wind load integration
- Overturning and sliding stability ratios
- Intermediate wind girder section modulus
API 650 § 5.11 / § 5.9.7
Seismic Analysis
Two-mass impulsive/convective model per API 650 Appendix E. Auto-selects ASCE 7-10 or 7-16 based on API edition. Full IS 1893 Part-2 support for Indian projects.
- ASCE 7-10 (11th/12th Ed) and ASCE 7-16 (13th/14th Ed)
- IS 1893 Part-2 + IITK-GSCDMA guidelines
- Site Spectra method (direct Sai/Sac)
- Impulsive and convective base shear
- Overturning moment and sloshing height
API 650 Appendix E
Anchorage Design
Auto-sizes anchor bolt diameter and count to resist combined seismic and wind uplift per Appendix E. Checks shell compression and bolt tension. Covers bolt chair geometry.
- Auto bolt sizing: M20 through M64
- Anchor chair geometry and weld checks
- Combined seismic + wind uplift
- Bolt material: A307, A193 B7
- Annular plate interaction check
API 650 Appendix E / § E.6
External Pressure
Shell buckling analysis under external pressure per API 650 Appendix V. Calculates critical buckling pressure, required stiffener ring spacing, and verifies shell adequacy against vacuum and wind-induced suction loads.
- Critical external pressure calculation
- Shell buckling mode check
- Stiffener ring spacing determination
- Vacuum load case analysis
- Wind-induced suction on shell
API 650 Appendix V
Nozzle Weights
Automated nozzle and appurtenance weight schedule per ASME B16.5 flange classes. Calculates shell, roof, and bottom nozzle weights including pipe stubs, flanges, reinforcement pads, and blind flanges by count and class.
- Shell, roof, and bottom nozzle inventory
- ASME B16.5 flange classes: 150 to 2500
- Pipe stub, flange, and blind weight lookup
- Reinforcement pad weight included
- Total appurtenance weight for foundation load
ASME B16.5 / ASME B36.10M
Wind Girder
Intermediate and top wind girder section modulus design per API 650 § 5.9.7. Verifies the shell stiffness against wind buckling with required section modulus calculation for the top curb angle and any intermediate stiffening rings.
- Top wind girder section modulus check
- Intermediate stiffener spacing calculation
- Shell transformed section participation
- Curb angle adequacy verification
- Wind pressure per IS 875 or ASCE 7
API 650 § 5.9.7
Weights & Foundation Load
Full weight schedule for erected, operating, and hydrotest conditions. Foundation loads: vertical, horizontal shear, and overturning moment for civil/structural interface.
- Shell, roof, bottom, nozzle, fluid weights
- Internal coil and external attachments
- Insulation weight contribution
- Foundation Pmax, Pmin, overturning moment
- Three load cases: erected, operating, hydrotest
API 650 § 5.2 / Appendix E
PDF Reports & AVEVA Export
One-click PDF with all modules, clause references, intermediate values, and PASS/FAIL status. Export AVEVA E3D PML scaffold for 3D plant integration. Save and reload designs.
- Single-click comprehensive PDF generation
- All clauses and intermediate values shown
- PASS/FAIL status for every design check
- AVEVA E3D PML scaffold export
- Save and reload previous calculations
Full engineering report — stamp ready
Workflow
From inputs to stamped report in minutes
Designed around how engineers actually work — not how software vendors think they do.
01
Enter Design Basis
Input geometry, pressures, temperature, materials, seismic zone, wind speed, and site conditions — all on one structured Inputs page.
02
Run All Calculations
All 13 modules run simultaneously. Cross-tab data flows automatically — shell feeds anchorage, which feeds foundation load. No manual re-entry.
03
Export Report
Generate a comprehensive PDF engineering report, save the design to the dashboard, or export geometry as AVEVA E3D PML — all in one click.
Real Product Walkthrough
Actual app screens from live usage
These clips use real captures from the running app at app.tankcode650.com. PDF export is shown in paid access mode.
app.tankcode650.com/dashboard
1. Open Project Dashboard
Review saved calculations and start new design sessions.
2. Enter Design Basis
Set geometry, pressures, material and code basis in the workbook.
3. Run and Review Shell Checks
Inspect course-by-course thickness requirements and governing checks.
4. Export PDF (Paid Access)
PDF export is available in paid plan accounts and enabled in the module toolbar.
About Us
Built by engineers.
Built by engineers.
For engineers.
TankCode 650 was born from a simple frustration: API 650 tank design still happens in fragmented spreadsheets, disconnected calculation sheets, and decade-old desktop tools that crash before a deadline.
At Codebase Engineering, we set out to build the calculation platform we always wished existed — one that covers the full API 650 design scope, stays current with the latest edition, handles Indian and US seismic standards equally well, and produces reports that engineers can actually submit.
Every formula in TankCode 650 is traced to its clause in API 650. Every intermediate value is visible. Every design check is explicit. Because engineers deserve tools that show their work — not black boxes that output a number and ask you to trust it.
Clause-tracedEvery output references its API 650 source
TransparentAll intermediate values shown — no hidden steps
Edition-currentUpdated for API 650 14th Edition, August 2025
FAQ
Common questions
Which API 650 editions does TankCode 650 support?
TankCode 650 supports the 11th, 13th, and 14th Editions. The 14th Edition (August 2025) is the default. Edition selection is on the Inputs page and automatically adjusts ASCE seismic version, table references, and clause logic throughout all modules.
What seismic standards are supported?
Four methods: (1) ASCE 7-10 mapped spectrum, (2) ASCE 7-16 mapped spectrum, (3) IS 1893 Part-2 + IITK-GSCDMA for Indian projects, and (4) Site Spectra using direct spectral acceleration inputs. The correct ASCE version is auto-selected from the API edition chosen.
Is TankCode 650 a web app or desktop software?
TankCode 650 is browser-based — no installation required. It can be deployed on your own office server for network-wide access, or accessed via a hosted instance.
Can I export the PDF report for client submission?
Yes. The PDF export covers all 13 calculation modules with formula references, intermediate values, API 650 clause citations, and PASS/FAIL status for every design check. Structured for engineering submission.
What wind design methods are available?
IS 875 (Indian standard) with k1, k2, k3 risk and terrain factors, and ASCE 7 with Kz, Kzt, and Kd factors. Both integrate multi-elevation wind loads for overturning and sliding stability checks per API 650 § 5.11.
How is pricing structured?
TankCode 650 offers five plans: Trial (free, 7 days — shell, bottom, roof), Basic ($20/month — core modules), Standard ($40/month — all modules + PDF reports), Advanced ($45/month — Standard + 3D viewer + PML export + team sharing), and Enterprise (custom pricing — on-premise installation, unlimited users, custom modules, SSO). Annual billing saves 20%. See the Pricing section for the full comparison table.
Pricing
Simple, transparent pricing
Choose the plan that fits your workflow. All plans include cloud access and automatic API 650 edition updates. All prices exclude applicable taxes.
Monthly
Annual
Save 20%
Trial
Try It Free
$0
7-day access · no card required
Evaluate core design modules before committing. Full calculation accuracy, no watermark.
- Shell design module
- Bottom plate design
- Roof design (cone & dome)
- All 3 API 650 editions
- SI & US Customary units
- Seismic / Wind / Anchorage
- PDF report export
- Saved calculations
Basic
Basic
$20/mo
per user · excl. tax
For individual engineers needing core structural design checks on tanks.
- Shell design module
- Bottom plate design
- Roof design (cone & dome)
- SI & US Customary units
- All 3 API 650 editions
- 5 saved calculations
- Seismic / Wind / Anchorage
- PDF report export
Most Popular
Standard
Standard
$40/mo
per user · excl. tax
Full calculation suite for professional engineers. Everything you need for stamp-ready reports.
- All Basic modules
- Seismic analysis (4 methods)
- Wind stability & girder design
- Anchorage & anchor bolt sizing
- External pressure / buckling
- Weights & foundation loads
- PDF engineering report export
- Nozzle weight schedule
- 50 saved calculations
- 3D model viewer
- PML / AVEVA export
Advanced
Advanced
$45/mo
per user · excl. tax
For teams and firms needing 3D visualization and plant design tool integration.
- Everything in Standard
- Interactive 3D tank model viewer
- AVEVA E3D PML export
- Unlimited saved calculations
- Priority email support
- Team sharing (up to 5 users)
- Early access to new modules
Full Suite
Enterprise
Enterprise
Custom
on-premise or cloud · annual contract
Unlimited users, on-prem installation, custom requirements, and dedicated engineering support.
- All Advanced features
- On-premise server installation
- Unlimited users / seats
- Custom calculation modules
- White-label / company branding
- SSO / Active Directory integration
- Dedicated account manager
- SLA-backed uptime guarantee
| Feature | Trial 7 days |
Basic $20/mo |
Standard $40/mo |
Advanced $45/mo |
Enterprise Custom |
|---|---|---|---|---|---|
| Calculation Modules | |||||
| Shell course-by-course thickness design | |||||
| Bottom plate design | |||||
| Roof design (cone & dome, fixed & floating) | |||||
| Seismic analysis (ASCE 7-10, ASCE 7-16, IS 1893, Site Spectra) | |||||
| Wind stability & overturning (IS 875 / ASCE 7) | |||||
| Wind girder design (intermediate & top) | |||||
| Anchorage & anchor bolt auto-sizing | |||||
| External pressure & shell buckling | |||||
| Weights & foundation load summary | |||||
| Nozzle weight schedule | |||||
| Interactive 3D tank model viewer | |||||
| AVEVA E3D PML export | |||||
| Standards & Editions | |||||
| API 650 14th Edition (2025) | |||||
| API 650 11th & 13th Editions | |||||
| SI & US Customary units (auto-convert) | |||||
| Output & Reports | |||||
| PDF engineering report (all modules) | |||||
| API 650 clause citations in report | |||||
| PASS / FAIL status on every design check | |||||
| White-label / custom company branding on PDF | |||||
| Calculation Storage & Data | |||||
| Saved calculations | None | 5 | 50 | Unlimited | Unlimited |
| Cloud auto-save (no data loss) | |||||
| Calculation revision history | |||||
| Team & Access | |||||
| User seats | 1 | 1 | 1 | Up to 5 | Unlimited |
| Team project sharing | |||||
| SSO / Active Directory | |||||
| On-premise server installation | |||||
| Support | |||||
| Documentation & help center | |||||
| Email support | Community | Standard | Standard | Priority | Dedicated |
| Response time SLA | — | 5 days | 3 days | 1 day | 4 hours |
| Onboarding & training session | |||||
| Dedicated account manager | |||||
| Uptime SLA guarantee | |||||
Contact Us
Get in touch
Ask a technical question or share feedback about TankCode 650. To enquire about a plan, use the Pricing section above. We respond within one business day.
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