Proceus General Terms

Part I. Common terms

This part applies to every Proceus account, whether it is used for the application, the agents service or both. Parts II and III add what is particular to each.

1. Purpose and acceptance

These terms govern the use of the Proceus services ("Proceus"). By creating an account or using any of them, you accept them. If you accept them on behalf of a company, you declare that you can bind it, and the company is bound by them.

2. The services

One account gives access to:

• The Proceus application (proceus.com): pressure vessel design with a 3D model, calculations and reports to the design codes, a materials database and an artificial intelligence assistant (part II).
• The agents service (mcp.proceus.com and calc.proceus.com): the same calculations for artificial intelligence assistants and programs (part III).

The calculations follow the codes each version covers, among them ASME VIII Division 1, EN 13445, AD 2000, CODAP, PD 5500, GOST R 52857 and GB 150, and state the code, the clause applied, the data assumed and the versions of the software and of the materials database used. What they do not calculate (for example local loads, fatigue or wind) they say, and do not estimate.

3. Results are for guidance

Every result must be reviewed by a competent engineer before it is used in the design, fabrication or inspection of equipment. Every calculation and report says so.

• Proceus does not certify any equipment, does not replace a notified body or an inspector, and does not sign calculations.
• Results depend on the data entered. You are responsible for its being correct and complete, and for confirming what Proceus states as assumed.
• An artificial intelligence assistant, whether Proceus's own or a third party's, may misread a question or a result. What the assistant writes must be checked all the same; Proceus answers for what its tools calculate.
• To the extent the law allows, Proceus is not liable for indirect damage or loss of profit, nor for the consequences of using a result without the review this section requires. Its total liability to you is limited to what you have paid it in the 12 months before the event that gives rise to it. If you use the services without paying (free plan or trial licence), you do so at your own risk and Proceus will not compensate you for their use. These limits do not apply in case of wilful misconduct or gross negligence, nor do they reduce the rights the law grants consumers.

4. Account and access

• A Proceus account with a verified email address is required.
• Account details must be true. You are responsible for keeping your password and, if you turn it on, your second factor safe, and for everything done with your account.
• Every account belongs to an organization: its company's or, if you sign up on your own, a personal one.
• Tell Proceus as soon as you know or suspect that someone is using your account without permission.

5. Acceptable use

You may not:

• exceed or get round the usage limits, open several accounts to multiply them or share one account between people;
• try to access other people's data or accounts, or unpublished parts of the services;
• put loads on the services that harm other users, or test their security without Proceus's written permission;
• resell the services, or offer them to others as your own, without an agreement with Proceus;
• extract the materials database or the results in bulk to rebuild the services.

6. Personal data and privacy

• For your account, your name, email address, organization, language and sign-in data are kept. What each service keeps of your work is explained in parts II and III.
• Everything is hosted in the European Union, in Spain.
• Proceus uses a single cookie, the session cookie, needed to sign in; it uses no analytics or advertising cookies.
• Some providers process data on Proceus's behalf, with the safeguards of the GDPR: the payment processor and the provider of the assistant's artificial intelligence model (parts II and III). They are IONOS SE (Germany), which hosts the servers in Spain; Stripe Payments Europe, Ltd. (Ireland), for payments; and Google (Gemini service), for the application's assistant. Where any of them processes data outside the European Union, it does so with the safeguards the GDPR requires for international transfers.
• The processing of your personal data is governed by the Proceus privacy policy (proceus.com/privacy-policy.html). If you use the services on behalf of a company, Proceus acts as processor under Article 28 of the GDPR, under the data processing agreement Proceus will make available to any company that asks for it.

7. Intellectual property

The software, the materials database, the documentation and the Proceus marks belong to Proceus or its licensors. These terms only give you the right to use the services while they are in force. The data you enter and the results you obtain for your equipment are yours, and you may use them freely with the review section 3 requires.

8. Availability, changes, suspension and closing an account

• Proceus aims to keep the services available, but does not guarantee they will be free of interruptions, unless a paid plan agrees a service level of its own.
• The services change: codes are added, calculations corrected and the materials database updated. Calculations state the versions used, so they can be reproduced or reviewed, and changes that alter results already published will be announced in the release notes.
• Proceus may suspend an account that breaches these terms or puts the services at risk, giving notice first where possible.
• You may close your account at any time by writing to proceus@proceus.com. Closing it deletes your account data and, in the application, your designs, except what the law requires to be kept (for example, invoices).

9. Changes to these terms, governing law and contact

• Proceus may change these terms. Significant changes will be announced by email or on signing in 30 days in advance; if you do not accept them, you may close your account before they apply.
• These terms are governed by Spanish law. If you are a consumer, you may go to the courts of your place of residence; in all other cases, the parties submit to the courts of Proceus's registered address.
• These terms are published in Spanish and English; if the two versions differ, the Spanish one prevails. For any question or claim: proceus@proceus.com.

Part II. The Proceus application

10. What it offers

The application lets you design pressure vessels (components, design and test conditions, nozzles, supports, jackets and stiffeners), view them in 3D, calculate them to the chosen code and get their calculation reports, and look up the materials database.

11. Your designs

• The application keeps the vessels, projects and equipment you create, with their design data and a thumbnail, so that you can come back to them. Unlike the agents service, here your design data is kept.
• Only you and, where there is one, whoever your organization authorizes can see them. Proceus does not pass them on to others or use them for any other purpose.
• They are kept while you have the account. You can ask for a copy or for their deletion at proceus@proceus.com.
• Keep your own copies of what matters: Proceus is not liable for loss of data.

12. Artificial intelligence assistant

The application's assistant helps you edit and calculate your saved vessels. To answer, it sends your message and the data of the vessel it is working on to an artificial intelligence model provider (Google, with its Gemini service), which processes them on Proceus's behalf, on terms that do not allow it to use them to train its models. If you do not want them to leave Proceus, do not use the assistant. What the assistant proposes must be checked like any result (section 3).

13. Licences and payments

• Some functions need a licence, bought in the application with a one-off payment and valid until its expiry date. Creating an account includes a trial licence of the application, whose scope and duration are shown in the application.
• Payment is processed by Stripe; Proceus neither sees nor keeps your card details. Prices include the VAT that applies; for EU businesses with a VAT number, the reverse charge applies.
• The terms of each purchase (price, duration, renewal, refunds and, if you are a consumer, the 14-day right of withdrawal and when it is lost on starting to use the licence) are governed by the purchase terms shown before each purchase, accepted on paying.

Part III. The agents service (MCP and API)

14. What it offers

Proceus's calculations and materials search for artificial intelligence assistants and programs:

• MCP, at mcp.proceus.com, for assistants such as Claude, ChatGPT or those of code editors, which sign in with your account.
• REST API, at calc.proceus.com, for programs and systems.

The assistant you use is a third party's service, with its own terms; what you send it is also subject to them.

15. Company keys

A company may receive keys so that its own systems use the service without a person signing in, each with the permissions assigned to it. The company is responsible for their use, must keep them secret and tell Proceus if they leak, so they can be renewed.

16. Plans and limits

Every new account has a free plan with low usage limits, which allows calculating. Proceus may offer paid plans with higher limits; their prices and terms will be published before they apply and accepted separately. Application licences do not include the agents service, unless stated on buying them.

Each organization has limits on requests and on simultaneous calculations, which depend on its plan and are shared by its people and its keys. Beyond them, the service asks you to wait a few seconds. A calculation that takes longer than 5 seconds is stopped.

17. What is recorded

The agents service does not keep your vessels' data. The figures you send (dimensions, pressures, materials) are used to calculate and are not recorded, because they may be your or your clients' trade secrets.

Of each request, only the following is recorded, for security, billing and support:

These records are kept for 13 months and then deleted.

Version 1.0, of 18 October 2026. Contact: proceus@proceus.com.