Views: 0 Author: iTECH Dredger Publish Time: 2026-11-13 Origin: Site
A cutter suction dredger quotation is only as useful as the enquiry behind it. When buyers send a one line request asking for the price of a 20 inch dredger, they receive one line answers that cannot be compared, and the cheapest number usually hides the largest exclusions. This article explains how to write an enquiry that produces comparable quotations, what should be inside a professional offer, and how to negotiate on scope rather than on headline price.
Every enquiry should state the soil class and gradation from borehole or grab samples, the required dredging depth with margin, the production target in placed material per shift, the discharge pipeline length and disposal method, the power source available on site, the transport route and delivery port, and any certification or permit requirement.
With those seven inputs a manufacturer can select a model, size the pump, choose the cutter head and quote realistically. Without them, the offer is a catalogue reference with a price attached and a long list of assumptions the buyer has not read.
The table lists the sections a complete quotation should carry and what each tells the buyer.
| Section | Content | What It Reveals |
| Technical offer | Model, dimensions, pump curve, depth, power | Whether the machine fits the job |
| Scope of supply | Itemised list with quantities | What is included and excluded |
| Options | Priced alternatives with effect | Cost of upgrading later |
| Price schedule | Unit prices, packing, freight basis | Comparable totals |
| Delivery | Lead time, Incoterm, port, validity | Schedule and currency risk |
| Payment | Milestones and percentages | Cash flow exposure |
| Warranty and service | Duration, coverage, spares, training | Support after delivery |
The most common cause of a misleading low price is an incomplete scope. Check specifically for the discharge pipeline and couplings, the swing and ladder anchor package, the spare parts kit, the tool kit, the commissioning days and the training days. Each of these is a real cost that reappears later if excluded.
Check also what is not included by design: paint specification beyond the standard system, class certification, a rock cutter head, cabin air conditioning, a booster pump and an extended ladder. A quotation that lists exclusions openly is more trustworthy than one that is silent.
Confirm that the pump curve is supplied with the quoted duty point marked, that the maximum dredging depth is stated with the ladder angle and draft, and that the hull dimensions and module weights are given. Ask for the steel plate thickness by area, the engine make and model, and the hydraulic component brands.
Then compare those values against published reference data for the class. A 250 mm machine normally carries a main engine around 350 kW, an eight metre depth, a one metre cutter and 325 mm spuds; a 500 mm machine typically runs a 950 kW main engine, fourteen metre depth, a 1.5 metre cutter and 630 mm spuds. Significant deviations deserve an explanation.
The table gives a quick baseline so that a quotation can be checked against what the class usually delivers.
| Parameter | CSD250 | CSD300 | CSD500 |
| Rated slurry capacity | about 800 m3/h | about 1,200 m3/h | about 3,500 m3/h |
| Max depth | 8 m | 12 m | 14-15 m |
| Suction / discharge | 250 / 250 mm | 300 / 300 mm | 550 / 500 mm |
| Main engine | about 350 kW | about 500 kW | about 950 kW |
| Cutter power | about 50 kW | about 90 kW | about 170 kW |
| Fuel consumption | about 60 L/h | about 90 L/h | about 160 L/h |
Steel and engine prices move, so a quotation normally states a validity period of thirty to ninety days. Buyers planning a purchase several months ahead should ask for the index assumption behind the price, or for an option to fix the price against a deposit.
On international purchases, state the currency and the exchange rate basis. A price in US dollars with a three month lead time carries real currency risk, and some suppliers will quote in a second currency on request.
The Incoterm sets where the seller's responsibility ends. Ex works, FOB, CIF and DAP produce very different landed costs. Buyers should ask for the FOB price plus a freight and insurance indication so that the delivered cost is visible, and should confirm the port of loading and the packing method.
For a modular dredger, packing affects freight volume directly. Ask for the number of packages, the total volume and the heaviest lift, and check those figures against the transport route to site.
The productive negotiation is about scope. If two offers differ by twenty percent, ask what the difference buys: a heavier gearbox, a branded engine, machined pontoon joints, a documented test programme, more commissioning days. Then decide which of those actually matter for the project.
Discounts that remove testing, documentation or spare parts are not discounts, they are transfers of risk. A better outcome is a slightly higher price with a complete scope and a written post-delivery support commitment.
Ask for the pump duty point, the steel thickness, the module weights, the commissioning duration, the spare parts price list, the warranty exclusions and the response time for technical support. Ask which items are subcontracted and who inspects them.
A supplier who answers all of these in writing, promptly and specifically, is the one to shortlist. The quality of the quotation process is usually a reliable preview of the quality of the machine and the support that follows it.
The recurring errors are a missing pump curve, depth quoted without a ladder angle, a capacity figure with no soil assumption, an engine described only by power and not by make, and a scope that omits the pipeline and the anchors.
Each is easy to test: ask one specific follow-up question and see whether the answer is a number or a restatement of the brochure. Two or three such questions usually reveal how much engineering sits behind the offer.
