ISO 9093 Assembly Strength Test Report

Through-Hull Fitting Assembly Strength Test Report

Annex A.3 — Assembly Test in accordance with ISO 9093:2020

ISO 9093:2020

Small craft — Seacocks and through-hull fittings

ANNEX A.3 · NORMATIVE

1. Product and Manufacturer Identification

Manufacturer Name

Enter manufacturer name

Country of Manufacture

Enter country

Date of Test

DD / MM / YYYY

Product / Model Designation

Enter product name or model number

Nominal Bore Size

e.g. G 1½ in / 38 mm

Material (Metallic / Non-Metallic)

e.g. DZR Brass

Batch / Serial Number

Enter batch or serial number

Test Conducted By

Name of test operator

Test Facility / Location

Enter facility name and location

2. Purpose and Scope of This Test

What This Test Verifies

The Assembly Strength Test (ISO 9093:2020, Annex A.3) verifies that a through-hull fitting or seacock assembly, once installed in or representative of its final installation condition, can withstand the mechanical loads that may be imposed on it during normal vessel operation without leaking, deforming, or losing structural integrity.

Unlike the component-level test in Annex A.2 — which is carried out on an isolated fitting mounted to a rigid baseplate — this test is performed on the assembly as installed, or on a representative sample that faithfully replicates the actual installation. This distinction is important: it captures the effect of hull panel flexibility, bedding compounds, and fastening methods on the overall system strength.

Compliance with this clause is mandatory for CE marking under Directive 2013/53/EU (Recreational Craft Directive) via EN ISO 9093:2021, which cites this standard in relation to Annex I, Clause 3.4 — Openings in hull, deck and superstructure.

3. Test Procedure — Step by Step

Equipment Required Before Starting

A calibrated force-application device (hydraulic ram, load cell, or press) capable of sustaining a steady perpendicular load; a water pressure test pump capable of reaching 0.1 MPa (1 bar); a timer; a representative hull panel section or the actual installed assembly; appropriate sealant and fastening materials as used in production; and a camera for photographic documentation of each stage.

Prepare the representative sample. Mount the through-hull fitting or seacock assembly into a hull panel or test panel that is representative of the actual production installation. Use the same hull material (e.g. GRP, aluminium, wood laminate), the same bedding compound, the same backing plate arrangement, and the same torque values as applied in production. The assembly must replicate what will be installed on the final vessel.

Allow adequate cure time. If bedding compounds or adhesives are used, allow full cure time as specified by the compound manufacturer before proceeding. Record the compound type and cure period in the remarks section of this report.

Pre-pressurize with water. Close the seacock (if fitted) and fill the assembly with fresh water, ensuring all air is expelled. Apply an internal water pressure of 0.1 MPa (1 bar) and hold for a minimum of 60 seconds. Inspect all joints and the hull interface for any sign of weeping or leakage before applying mechanical load. Record the pre-test condition.

Determine the required test force. Based on the nominal bore diameter of the fitting, select the appropriate minimum force from the table below. The force must be applied perpendicular to the inboard end of the assembly — that is, acting laterally against the direction in which side-loads would act during operation.

Nominal Bore Size	Minimum Test Force	Hold Duration
25.4 mm (1 in) and below	1 500 N	30 seconds
Above 25.4 mm (1 in)	2 224 N	30 seconds

Apply the mechanical force. Using the calibrated device, apply the required force perpendicular to the inboard end of the assembly and maintain it for a continuous period of 30 seconds. Do not apply the load with sudden impact — increase force gradually to the target value. Maintain internal water pressure at 0.1 MPa throughout the duration of the mechanical load application.

Inspect under load. During the 30-second hold, visually inspect the entire assembly — the hull interface, bedding compound line, flange, stem, seacock body, and hose connection — for any evidence of leakage, distortion, or displacement. Any leakage to the outside of the assembly constitutes a failure. Take photographs of the assembly under load as evidence.

Release load and inspect post-test. After the 30-second hold, release the mechanical force. Maintain water pressure and conduct a final visual inspection for leakage. Then release the water pressure, disassemble the assembly, and inspect all components individually. No part of the fitting or assembly shall display any sign of damage affecting its function. If the assembly includes a seacock, verify that it remains fully operable (opens and closes freely).

Document and photograph. Record all measurements, observations, and test results in this report. Attach photographs of the test setup, force application, and post-disassembly condition of components. Retain the tested sample or components for a minimum of two years as evidence.

Important This test must be carried out in addition to the component-level test described in ISO 9093:2020, Annex A.2. Passing the component test alone does not constitute compliance with Annex A.3. Both tests are normative requirements for CE marking purposes.

4. Photographic Evidence

Attach clear, well-lit photographs in each slot below. Photographs must be labelled and dated. Digital originals should be retained in an accessible file linked to this report reference number.

Photo 1

Test assembly before force application
showing hull panel and fitting installation

Photo 2

Force application device in position
at the inboard end of the assembly

Photo 3

Assembly during 30-second hold under
full mechanical load and water pressure

Photo 4

Disassembled components after test
showing condition of all parts

5. Recorded Test Measurements

Parameter	Recorded Value	Requirement
Nominal bore size of assembly tested		As specified
Force applied (N)		≥ 1 500 N or ≥ 2 224 N
Duration of force application (seconds)		Minimum 30 s
Internal water pressure maintained during test		0.1 MPa (1 bar)
Ambient temperature during test		15 °C – 25 °C
Bedding compound used (if any)		As per production spec
Hull panel material and thickness		Representative of production

6. Acceptance Criteria — ISO 9093:2020, Annex A.3

All criteria below must be satisfied for the assembly to be considered compliant. Mark each criterion Pass or Fail after completing the test and disassembly inspection.

Ref

Acceptance Criterion

PASS

FAIL

A.3.1

The required force was applied perpendicular to the inboard end of the assembly and maintained for a continuous period of not less than 30 seconds.

A.3.2

The assembly showed no leakage to the outside of the assembly when subjected to an internal water pressure of 0.1 MPa (1 bar) during and after the mechanical load application.

A.3.3

The assembly performed as intended — no displacement of the fitting relative to the hull panel was observed during or after the force application.

A.3.4

Upon disassembly, no part of the fitting or assembly displayed any sign of damage affecting its function (e.g. cracking, deformation, thread stripping, fracture of the flange or stem).

A.3.5

If the assembly includes a seacock, it remained fully operable (capable of being opened and closed by hand) after disassembly and post-test inspection. (Mark N/A if no seacock is included.)

7. Observations and Remarks

8. Overall Test Verdict

Assembly Test Result

ISO 9093:2020 — Annex A.3

PASS

FAIL

9. Declaration and Signatures

Test Operator

Signature & Date

Witnessed By (if applicable)

Signature & Date

Manufacturer Representative

Signature & Date

Certifying Body / Notified Body (if applicable)

Signature, Stamp & Date

    Disclaimer —
    This template is an independent compliance tool prepared by Blue Peter Marine / CEInspector.com. It references ISO 9093:2020 by title and clause number only. No normative text, definitions, tables, or figures from ISO 9093:2020 have been reproduced. ISO standards are protected by copyright. Users must obtain a licensed copy of ISO 9093:2020 directly from ISO (www.iso.org) or their national standards body before conducting tests. CEInspector.com accepts no liability for the outcome of tests conducted using this template.
  