Iranian Classification Society Rules

Section 3 FRP

301. General

1. Application

The tests, process tests and strength tests of FRP used for hull construction of FRP ships (including FRP laminates and sandwich laminates) are to be in accordance with the requirements in this section.

2. Construction

(1) All constructions are to be carried out using materials approved or accepted by the Society.

(2) All materials are to be in accordance with the approved construction documentation.

(3) All batches of materials are to be provided with unique identifications by their manufacturers.

Components are to be similarly identified.

(4) No batch of material is to be used later than its date of expiry.

(5) The Builder is to ensure that all batches of materials are used systematically and sequentially.

(6) The Builder is to maintain, on a continuous basis, records of the amounts of resin and re- inforcement used, in order to ensure that the proportions remain within the limits set in the construction documentation.

(7) Records are to be kept of the sequence and orientation of the reinforcements.

(8) The Builder is to ensure that each section of the construction is traceable to the batch or batch- es of material used.

(9) Any curing system used is to be demonstrated as suitable for the intended purpose and all py- rometric equipment is to be calibrated at least annually and adequate records maintained.

(10) The post-curing temperature is to be controlled and recorded by the attachment of suitably placed thermocouples.

3. Quality assurance

Where the Builder has a quality assurance system, this is to include the requirements of this Section.

4. Dimensional tolerances

(1) Dimensions and tolerances are to conform to the approved construction documentation.

(2) The thicknesses of the laminates are, in general, to be measured at not less than ten points,

evenly distributed across the surface. In the case of large sections, at least ten evenly distributed measurements are to be taken in bands across the width at maximum spacing of two metres along the length.

(3) The responsibility for maintaining the required tolerances and making the necessary measure- ments rests with the Builder. Monitoring and random checking by the Surveyor does not ab- solve the Builder from this responsibility.

(4) Where ultrasonic thickness gauges are used, these are to be calibrated against an identical lami- nate (of measured thickness) to that on which the thickness measurement is to be carried out. If suitable pieces are not available from the construction, then a small sample of identical lay-up is to be prepared.

5. Visual examination

All constructional mouldings and any components are to be visually examined and are to be free from surface defects and blemishes.

302. FRP Specimen Tests 【See Guidance】

1. The FRP specimen tests for the structural members listed in the following are tests and inspections of FRP to be carried out prior to the commencement of moulding of FRP ships. Where composi- tion of laminates is same, repetition test may be abbreviated.

(1) Bottom shell laminates

(2) Side shell laminates

(3) Upper deck laminates

(4) Bulkhead (only of sandwich construction)

2. The FRP material tests on the other members are to be carried out only in case where scantlings are modified in accordance with the requirements in Ch 1, 304. 2.

3. The test specimens for FRP specimens material tests used for construction members previous 1 are to be cut from FRP which are of the same laminate composition (excluding gelcoats) and moulded by the same procedure and at the same workshop as the actual hull laminates. The test specimens are to be tested and inspected on the items listed in the following. The procedures of tests and in- spections are to be in accordance with the discretion of the Society.

(1) FRP laminates (including FRP laminates of inner layer and outer layer of sandwich laminates)

(A) Thickness of moulding

(B) Glass content (ratio in weight)

(D) Modulus of bending elasticity

(E) Tensile strength

(F) Modulus of tensile elasticity.

(2) Sandwich laminates

(A) Thickness of moulding of sandwich laminates

(B) Tensile strength of sandwich laminates, only in case where the cores are reckoned in the tensile strength. In this case, the test specimens in which joints of cores are involved are to be included.

(C) Shearing strength of sandwich laminates. In case where the cores are reckoned in the bend- ing strength, the test specimens in which joints of cores are involved are to be included.

4. The test plates are size which can extract all test specimens prescribed previous 2 and the number of test specimens are to be five, unless specially specified, and the arithmetical mean of the small- er three values obtained from the five specimens is to be taken as the test result.

5. The result of FRP tests is not to be less than the strength specified in Ch 1, 304. for FRP lami- nates and not to be less than the value obtained from the tests specified in the Guidance relating to the Rules.

6. Certificates of FRP tests

Certificates of FRP tests containing the items listed in the following are to be submitted to the Society.

(1) Names of fibre reinforcements, resins for laminating and cores for sandwich construction

(2) Names and amount of application of fillers

(3) Names and amount of application of hardeners and accelerators

(4) Procedures and conditions of moulding

(5) Direction of selection of test specimens

(6) Dates of moulding and tests of test specimens

(7) Place of tests and environmental condition of the site of tests

(8) Types of testing machines

(9) Form and dimensions of test specimens

(10) Test results

303.

FRP Process Tests

1. FRP process tests are measurements of consumption rate and hardening for FRP materials during FRP moulding.

2. During construction, tests are to be carried out on with Table 3.7.

the constituents and final product in accordance

Table 3.7 Process Testing during construction(1)

Component/operation	Characteristic	Rate of testing
Resin/curing agent/catalyst	Gel time Rate of consumption	Two per shift(3) Continuous
Reinforcement	Quality Orientation Rate of consumption	Continuous Continuous Continuous
Resin/reinforcement	Ratio	Continuous
Construction	Temperature during cure/post cure Dimensions Cure level (Barcol) against resin manufacturer’s specification Laminate thickness Laminate fibre content(2)	Continuous Continuous against approved construction documentation At least one per square metre Continuous against material usage and approved construction documentation At the Surveyor’'s request
(Note) (1) The standards of acceptance for testing are those listed in the material manufacturer's specification, approved construction documentation or agreed quality control procedures as applicable. (2) In particular where the thickness measured does not correlate with the specified fibre content, by weight. (3) If the batch of resin or polymer, or the curing agent, or their ratio is changed, at least two addi- tional measurements of the gel time are to be carried out during each shift.

304. FRP Strength Tests

1. The FRP strength tests are tests and inspections ships.

to be carried out after the completion of FRP

2. The test specimens which are to be cut from the laminates and sandwich laminates taken from the actual hull laminates or the laminates and sandwich laminates equivalent thereto, are to carry out tests and inspections on the items specified in 302.

3. The results of FRP strength tests are to be submitted tests containing the items specified in 302. 5 and the

4. Where the results of FRP strength tests are less than tural members are to be properly strengthened.

to the Society as the results of FRP strength location of selection of test specimens.

those of being reckoned in design, the struc-

305.

Omission of FRP Tests and FRP Strength Tests

1. For a sister ship of others which were or are being built at the same workshop, the FRP tests and FRP strength test may be omitted, provided that the raw materials used, manufacturing methods, in-

spection standards in the workshop, quality control

system, etc. are examined and deemed appro-

priate by the Society. However, for ships not less than 20 m in length, the FRP strength tests are not to be omitted.

2. The FRP for which omission of the material tests specified in 1 is applicable are such FRP that have been recognized by the Society as being moulded by means of the same laminating and the same moulding procedures as those for the FRP having the certificates of FRP material tests in ac- cordance with the requirements in 302. 5.

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