Draft Survey

Draft survey is one of the key tools for controlling the quantity of bulk cargoes during sea and river transportation. When calculations are made in thousands of tons, and the cost of a batch directly depends on the actual weight, any error can lead to serious financial consequences. We conduct draft surveys as independent experts, ensuring measurement accuracy, calculation transparency, and the legal stability of the results.

In international trade, cargo mass is not just a technical parameter. It is the basis for commercial calculations between the seller and the buyer, the base for calculating freight, port dues, and insurance payments. If the actual weight differs from the declared one, disagreements, claims, and the risk of losses arise. Our task is to protect your interests and provide objective data that will be recognized by all parties to the transaction.

We do not just take the vessel’s draft. We analyze the entire range of factors affecting the accuracy of mass determination and ensure control of every stage of the procedure.

What is a draft survey and how it works

A draft survey is a method of determining cargo mass by calculating the change in a vessel’s displacement before and after loading or unloading. The principle is based on Archimedes’ law: a change in the vessel’s draft allows for calculating the change in its displacement, which means determining the actual weight of the loaded or unloaded cargo.

However, in practice, the calculation is significantly more complex than a simple formula. We take into account:

• actual draft readings at the bow, stern, and midships on both sides;

• water density in the port area at the time of measurement;

• the presence of list and trim;

• ballast water;

• reserves of fuel, fresh water, and other ship resources;

• features of the hydrostatic tables of the specific vessel.

Each of these parameters affects the final result. An error in determining water density or an incorrectly read draft scale can lead to significant discrepancies in the final mass. This is why we conduct measurements strictly according to the methodology, using professional tools and verifying the correctness of the raw data.

When a draft survey is necessary

In a number of cases, a draft survey becomes not an additional option, but a mandatory element of the transaction. This is especially relevant when working with large batches of bulk cargo, where measurement accuracy directly affects the economics of the project.

We recommend conducting a draft survey during:

• loading of bulk cargo onto a sea or river vessel;

• unloading at the port of destination to confirm the actual quantity;

• export or import of grain, coal, ore, scrap metal, and other mass cargoes;

• absence of certified shore scales;

• the need for independent control between the parties to the contract;

• the occurrence of disagreements regarding the quantity of cargo;

• insurance and possible losses.

We join the work both on the side of the sender and on the side of the recipient or charterer. Regardless of the interaction format, we act strictly in the interests of the customer and ensure the objectivity of the result.

Why the accuracy of a draft survey is critical for business

The mass of bulk cargo is measured in thousands of tons. Even a deviation of 0.5–1% for a large batch means significant financial losses. In conditions of high competition and marginal pressure, such discrepancies can affect the final profit of the deal.

We understand the level of responsibility and build the process in such a way as to minimize risks. To do this, we:

• verify the relevance of the vessel’s hydrostatic tables;

• analyze ship documentation before starting measurements;

• monitor the correctness of ballasting;

• take into account the influence of weather conditions;

• conduct repeat measurements if necessary.

We do not allow a formal approach. Every value is checked, compared, and logically analyzed. This level of control allows us to achieve high accuracy and ensure trust in the results from all participants in the transaction.

How we work

A professional draft survey requires clear coordination and experience working in a port environment. We coordinate the inspection time in advance, study the vessel’s features, and ensure the prompt departure of a specialist.

The procedure includes several sequential stages:

• preliminary analysis of the vessel’s technical characteristics;

• initial draft reading before the start of cargo operations;

• water density measurement;

• accounting for ballast and ship reserves;

• control of cargo distribution across holds;

• secondary draft reading after completion of loading or unloading;

• calculation of displacement change;

• determination of the actual cargo mass;

• preparation of a detailed report.

We conduct measurements in strict accordance with international practice. We pay special attention to the absence of list and trim at the moment of measurement. Under unfavorable weather conditions, we take additional measures to minimize errors.

The result of the work is a transparent and justified calculation that can be used for commercial, insurance, and legal purposes.

Every vessel has individual characteristics that directly affect the correctness of calculations. There is no universal approach in a draft survey. We study the documentation of the specific vessel in detail, including hydrostatic tables, loading plans, and information on the design features of the hull.

We conduct draft surveys on:

• sea bulkers of various deadweight;

• river dry cargo ships;

• barges and composite convoys;

• “river-sea” mixed navigation vessels.

When working with each type of vessel, we take into account the hull shape, features of the draft scales, correctness of marking, possible deviations, and hull condition. If scales are dirty or damaged, we record this in the report and apply correct data-reading methods. This approach allows for minimizing the risk of technical errors.

Draft survey of bulk cargoes

Draft survey is particularly in demand when working with mass and bulk cargoes. However, each type of cargo has its own characteristics affecting the loading process and weight distribution.

We regularly conduct draft surveys during operations with:

• grain crops and oilseeds;

• coal and coke;

• iron and manganese ore;

• scrap metal;

• mineral fertilizers;

• crushed stone, sand, and other construction materials.

When working with grain, we monitor the uniformity of distribution across holds and the correctness of ballasting. When loading ore or coal, we take into account the high density of the cargo and its influence on the vessel’s seating. During operations with scrap metal, we pay attention to possible uneven loads and local overloads.

We do not limit ourselves to mathematical calculation — we analyze the actual loading picture to exclude skews, trim, and other factors capable of affecting the accuracy of mass determination.

Independence and objectivity as the basis of trust

In matters of determining cargo mass, the absence of a conflict of interest is extremely important. We act as an independent party and act solely in the interests of the customer. Our specialists are not connected with shipowners, port operators, or shippers unless otherwise provided by the contract.

We ensure:

• transparency of calculation methodology;

• documentary recording of all raw data;

• photo-recording of draft scales and water density measurements;

• detailed description of all accounted parameters;

• justification for every correction.

If disagreements arise between the parties to the transaction based on the draft survey results, we are ready to provide clarifications and participate in negotiations. Our report can be used in claims work and serve as an evidence base in dispute resolution.

Draft survey as a tool for financial security

For companies working with large volumes of bulk cargo, a draft survey is an element of the risk management system. Regular independent control allows for identifying discrepancies at an early stage and preventing systemic losses.

With our help, you will be able to:

• minimize the risk of shortage;

• control the correctness of freight calculations;

• identify deviations during loading or unloading;

• reduce the likelihood of claim disputes;

• protect your marginality.

We understand that in international trade, not only accuracy but also speed is important. Therefore, we organize work promptly, taking into account the vessel’s schedule and port requirements. This allows you not to delay cargo operations and simultaneously receive reliable data.

If suspicions of shortage or discrepancies in cargo mass arise, a draft survey becomes key evidence. We join the project both at the stage of planned operations and when controversial situations arise.

In the event of an insurance event, we:

• conduct repeat measurements if necessary;

• analyze the correctness of previous calculations;

• prepare an expanded expert opinion;

• participate in communication with the insurance company.

A correctly executed report significantly accelerates the settlement process and reduces the likelihood of a payout refusal. We understand the requirements of insurance organizations and prepare documentation taking their standards into account.

Upon completion of the draft survey, we provide a detailed official report. The document contains full information about the measurements and calculations performed.

The report reflects:

• data about the vessel and the place of inspection;

• draft readings before and after cargo operations;

• water density and the method of its determination;

• information on ballast and ship reserves;

• displacement calculation tables;

• final cargo mass;

• professional conclusion.

If necessary, we prepare reports in English for international partners. Our documents are accepted by banks, insurance companies, and are used in judicial practice.

Control at every stage of the cargo operation

A draft survey is not limited to two measurement points — “before” and “after.” To ensure maximum accuracy, we control the process comprehensively. We assess the condition of the vessel before operations begin, record initial parameters, and accompany key stages of loading or unloading.

If it concerns loading, we track:

• the sequence of filling the holds;

• uniformity of cargo distribution;

• change in trim during operations;

• correctness of ballasting;

• compliance with technological norms.

During unloading, we analyze the dynamics of draft changes and verify the compliance of the actual displacement reduction with the expected volume of unloaded cargo. This approach allows for timely identification of discrepancies and prevents the accumulation of calculation errors.

We understand that in conditions of intensive port work, promptness is important. Therefore, we act in a coordinated manner, without delaying cargo operations while ensuring the necessary level of control.

Minimizing errors and a professional approach to measurements

The accuracy of a draft survey is affected by many factors: water agitation, temperature fluctuations, vessel list, dirty draft scales, and the human factor. We take each of these aspects into account and apply professional methods to minimize errors.

In our practice, we:

• perform measurements on both sides of the vessel to exclude the influence of list;

• calculate average values taking corrections into account;

• verify water density correctness using certified instruments;

• compare obtained data with hydrostatic tables;

• document every measurement.

If conditions in the water area complicate the draft reading, we take additional measures: we choose the optimal moment for measurements, take into account the influence of waves, and adjust calculations in accordance with the methodology. Such a detailed approach allows us to ensure the high reliability of the final result.

Transparency of calculations for all parties to the transaction

We understand that draft survey results must be clear not only to specialists but also to the commercial departments of companies. Therefore, in our reports, we disclose the calculation logic, used formulas, and raw data in detail.

Our reporting allows for:

• verifying the correctness of calculations;

• tracking the sequence of actions;

• comparing indicators with ship documentation;

• using data in commercial negotiations.

We are ready to provide additional clarifications upon the client’s request and participate in discussions of results with counterparties. This is especially important for international deliveries, where parties may be guided by different standards and practices.

Draft survey in international transportation

For the export and import of bulk cargoes, the requirements for accuracy and documentation are particularly high. We take into account the specifics of international trade and prepare reports that meet the expectations of foreign partners.

Within international projects, we:

• execute documentation in English;

• take into account the terms of contracts and specifications;

• comply with generally accepted calculation standards;

• interact with the vessel’s captain and representatives of the parties.

We understand that in international practice, a draft survey often becomes key evidence in case of disagreements. Therefore, we ensure impeccable accuracy of wording and completeness of data.

Economic effect of professional draft survey

For business, a draft survey is an investment in financial security. The cost of the service is disproportionately lower than the potential losses associated with errors in determining the cargo mass.

Regular independent control allows for:

• reducing the risk of shortage;

• excluding overpayment of freight;

• identifying systemic discrepancies in the work of contractors;

• increasing the transparency of calculations;

• strengthening the company’s reputation as a reliable partner.

We work with an understanding of the client’s economic logic and offer solutions that contribute to the long-term sustainability of the business.

Flexible cooperation formats

We are ready to adapt the work format to the client’s tasks. This can be a one-time draft survey in a specific port or regular support of deliveries under a long-term contract.

Possible interaction formats:

• one-time inspection during loading or unloading;

• control at both stages of delivery;

• participation in arbitration and disputed situations;

• systematic control within export programs.

We react promptly to changes in the vessel’s schedule and ensure the presence of a specialist within the agreed timeframe. For us, it is important that you receive a quality service without delays and organizational difficulties.

Draft survey from GPC Doerfer

If the accuracy of bulk cargo mass determination, transparency of commercial calculations, and risk minimization are important to you, we are ready to provide a professional draft survey. We will organize the work at a time convenient for you, perform the necessary measurements, and prepare a detailed report that will become a reliable basis for decision-making.

A draft survey in our performance is a combination of technical precision, independent expertise, and commercial orientation toward results. By contacting us, you receive a control tool that works to protect your interests and the stability of your business.