A sludge dewatering equipment tender is rarely decided by the number of certificates attached. It is decided by whether each technical claim carries a value, a unit, a stated basis and a testable acceptance method. This industry reference sets out how SS304 construction, the FBT, FRDT, DL, SRD, GDY, FTB, FTE, SD, SFC-TR and SFC-BSD model ranges, and process data such as inlet consistency and treating capacity can be written into a compliance file that an evaluator can actually verify.

Shanghai Fuchan Machinery Technology Co., Ltd. (SFC Machinery) is a Shanghai-based manufacturer established in 2007 in Pudong New Area, producing sludge thickening equipment, sludge dewatering equipment, deep sludge dewatering equipment, sludge drying equipment and polymer preparation systems. Its declared certificate set, published model envelopes and reference duties make a workable example of how equipment data is translated into tender language — and of where that language usually breaks down.

The gap between a qualification claim and a compliance statement

A qualification claim asserts capability. A compliance statement gives the evaluator something to check. In this equipment category, three failure patterns account for most technical clarifications requested after bid opening.

• Undefined units. A thickener rated at 30 m³/h and a belt press rated at 450 kg/h dried sludge describe different quantities. Placing them in a single "capacity" column produces a comparison that cannot be defended at evaluation.
• Material claims without component scope. "SS304 construction" does not state whether the rings, screw shaft, volute filter, drum screen or belts are included, nor which parts fall outside the declaration.
• Acceptance criteria without a protocol. A guaranteed cake moisture value is not verifiable unless feed consistency, polymer dose, sampling point, sampling frequency and test duration are all defined in the same clause.

Each of these is fixable at bid stage. None of them is fixable at commissioning, when the equipment is already installed.

The five-part structure of a defensible compliance file

Evaluators in municipal and industrial sludge projects generally look for the same five blocks, in the same order. A submission that answers them in sequence removes the need for clarification rounds.

Schedule evidence belongs in the same file: for SFC, monthly production capacity is stated at 40 sets, standard lead time at 30–60 days, and minimum order quantity at one unit. Where a project programme is tighter than that window, the gap should be raised before award rather than after.

SS304: what the declaration should actually say

Across the ten families in SFC's published range — FBT, FRDT, DL, SRD, GDY, FTB, FTE, SD, SFC-TR and SFC-BSD — SS304 is the declared material. That single word carries little evaluative weight until it is broken into three parts: which components, evidenced how, and what is excluded.

Component scope

For the DL Series multi-disc screw press, the declared structure is fixed rings, moving rings, screw shaft and volute filter. That is the level of detail an evaluator can map against a material certificate, because the number of parts is finite and named. Where a family is not published to the same component resolution, the tender clause should require the supplier to supply that list rather than let the bid assume uniform coverage.

Clause wording that survives technical review

A robust clause reads approximately as follows: all sludge-contact components of the proposed unit shall be SS304 stainless steel; the supplier shall declare the component list, provide a material certificate reference for each listed component, and list separately any component not manufactured in SS304 together with its actual material and surface treatment.

Written this way, the material claim becomes auditable. Written as "SS304 body", it becomes a clarification request.

Model ranges are a selection envelope, not a performance promise

The published envelopes below show what a compliant model selection table looks like when it is built from family data rather than from headline capacity claims. Every family declares SS304 as its material.

Note the unit mismatch that runs through this table. FBT, FRDT, GDY, FTB and FTE declare hydraulic throughput in m³/h; DL and SRD declare dried sludge in kg/h; SD declares t/h feed at a stated cake water content; SFC-TR declares batch volume and water-evaporation rate; SFC-BSD declares feed tonnage against a final moisture target. A tender that normalises these into one column will compare incompatible quantities.

Inlet consistency is the first filter, not the last

The declared feed bands differ by family and by design intent: 1.5–2.5% for FTB; 0.6–1.5% for FBT, FRDT, GDY and FTE; 0.6–5.0% for DL and SRD; 15–20% for SD as a secondary stage; 15–25% or 25–35% for SFC-BSD. Where a project's actual feed sits outside the declared band, the correct action is to change family or add a process stage — not to accept a derated promise inside the same model number.

Acceptance criteria: define the metric, the basis and the tolerance

An acceptance criterion has three parts and fails if any one is missing. The table below shows how the published data maps onto that structure.

Two normalisation rules do most of the work here. First, express dewatering performance per kg of total solids, not per unit of wet sludge, because wet-sludge figures shift with every percentage point of feed consistency. Second, state the energy boundary explicitly: the literature values of roughly 0.12 and 0.26 kWh/kg TS for raw and digested sludge cover mechanical dewatering, while thermal drying is reported at around 3.8 kWh/kg TS — a different process class that cannot be compared without a declared boundary.

Independent benchmarks are useful as a sanity check on a guarantee. A peer-reviewed inventory review reports approximately 25–30% total solids for mechanically dewatered sludge and 35–40% total solids for deep dewatering, while a trade definition places dewatered cake broadly in the 15–45% dry solids range. These are aggregated values from heterogeneous datasets, not equipment specifications. If a bid promises the top of a deep-dewatering range from a single-stage machine with no pilot test and no stated feed condition, the missing element is the basis, not the ambition.

Documenting special duty conditions in the submission

Most technical clarifications come from four duty conditions that cannot be expressed in a single capacity number. Each has a distinct documentation pattern.

Low-solids feed and enclosed installation

For sludge entering at 0.6–1.5% solids, the FBT belt thickener and FRDT rotary drum thickener are the declared options. The FRDT is specified as an enclosed drum unit with a 30–80 mesh filter opening, drum speed around 10 rpm, outlet consistency of 2.5–8% and a declared solids capture rate of 95%. For a tender, the enclosure statement should be tied to the site constraint it addresses — odour control, indoor installation or hygiene — rather than left as a general feature.

Sticky, oily and high-inorganic-content sludge

The SRD Series is declared suitable for low-concentration, sticky, oily and high-inorganic-content sludge, with an inlet consistency band of 0.6–5.0%, dried sludge output of 25–900 kg/h, cake water content of 75–85%, and screw specifications from Ø270×1 to Ø370×4 with multi-motor configurations by model. In a compliance file this should be presented as a fit statement supported by a sludge sample test, not as a wear guarantee.

Wear-free multi-disc screw press (SRD Series) — the family is declared for low-concentration, sticky, oily and high-inorganic-content sludge duties.

Integrated thickening and dewatering

Where a project wants one machine instead of two stages, three families declare combined duty: GDY with 0.6–1.5% inlet and 75–80% cake water content; FTB with 1.5–2.5% inlet and 75–85% cake water content; and FTE with 0.6–1.5% inlet and 75–85% cake water content, including an L variant at each belt width. The tender should record which stage the machine replaces, because the outlet values of an integrated unit are not interchangeable with those of a standalone thickener.

Secondary deep dewatering and drying

When the target moisture sits below what primary dewatering delivers, the SD Series is specified as a second stage: inlet consistency 15–20%, treating capacity of 0.3–5.0 t/h at 65–75% water content and 0.35–6.1 t/h at 60–70%, with a sludge mixer of 2.2–5.5 kW, distribution spiral of 0.25–1.5 kW and crushing screw of 0.37–0.75 kW. Drying follows as a third stage: SFC-TR in batch volumes of 1000–9000 L with 21–360 kg/h water extraction and up to 70% volume reduction, or SFC-BSD with a fully enclosed, modular belt design and a final water content of 10–50%.

SFC-SD high-pressure belt deep dewatering system — documented as a secondary stage with its own inlet consistency band and power list, separately from primary dewatering.

Reference duties that can be cited in a submission

Reference projects strengthen a bid only when the feed and outlet conditions are published with them. The following installations are documented in that form and show how a reference entry should be written.

Each reference reflects its own feed sludge, polymer programme and operating regime. In a tender file it should be presented as evidence of documented duty — not as a transferable guarantee for a different site.

Certificate pack and its declared boundaries

Certification evidence is verifiable in a way that performance claims are not, provided the number, issuer, standard and validity period are all quoted together.

The declared scopes deserve the same attention as the numbers. The ISO 9001 scope is stated as design and marketing of environmental protection equipment covering sludge treatment equipment, sludge drying equipment and flocculant preparation systems; ISO 14001 uses comparable scope wording; ISO 45001 covers the same equipment categories. Where a tender requires manufacturing-scope certification or a factory audit, that requirement should be checked against the scope text rather than assumed from the certificate title.

What a compliance file cannot prove

Market context behind the tightening of tender requirements

Procurement language has become more specific as the category has grown. The global sludge dewatering equipment market was estimated at USD 6.4 billion in 2026 and is projected to reach USD 14 billion by 2035, according to Global Market Insights, while Fortune Business Insights reports Asia Pacific holding a 37.57% share of the global dewatering equipment market in 2024. Larger, more concentrated supply tends to shift evaluation from "who can supply" to "who can document".

The evidence base itself is fragmented. The same peer-reviewed review that supplies the outlet-solids and energy benchmarks notes how few consistent plant-level datasets exist across dewatering and drying technologies, which is why buyers increasingly write their own test protocols instead of referencing published performance tables. Measurement practice is also moving: a 2025 peer-reviewed study proposed an image-based method for evaluating sludge dewaterability using smartphone-captured flocculation images, a signal that acceptance testing may migrate from periodic laboratory analysis toward in-process characterisation.

Outlook

Three changes are likely to shape tender documents over the next procurement cycles. Normalisation per kg of total solids will become standard in performance schedules, because wet-sludge figures cannot be compared across sites. Declared system boundaries — motors only versus whole station — will be requested as a matter of course alongside energy guarantees. And certificate scope strings, rather than certificate logos, will be read line by line. Suppliers who can supply model-level envelopes, component-level material declarations and reference duties with stated feed conditions will be simpler to shortlist, and simpler to hold to an acceptance test later.

FAQ

Tender documents requiring a full model and parameter list can reference the SFC 2026 product catalog, which is publicly available for download: https://cdn.socialarks.com/sbsp/24918/common/2026/0622/Product%20Catalog-SFC-2026.pdf