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DETNORSKE VERITASVeritasveien 1, N-1322 Hvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11

CERTIFICATION NOTES

No. 2.9

Type Approval Programme No. 4-732.10-1

TYPE APPROVAL PROGRAMME FOR GAS TURBINES

JUNE 1997

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Det Norske Veritas AS 1997

Data processed and typeset by Division Technology and Products, Det Norske Veritas AS

Printed in Norway by Det Norske Veritas AS

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6.97.2000

It is agreed that save as provided below Det Norske Veritas, its subsidiaries, bodies, officers, directors, employees and agents shall have no liability for anyloss, damage or expense allegedly caused directly or indirectly by their mistake or negligence, breach of warranty, or any other act, omission or error by

them, including gross negligence or wilful misconduct by any such person with the exception of gross negligence or wilful misconduct by the governingbodies or senior executive officers of Det Norske Veritas. This applies regardless of whether the loss, damage or expense has affected anyone with whom DetNorske Veritas has a contract or a third party who has acted or relied on decisions made or information given by or on behalf of Det Norske Veritas. *However, if any person uses the services of Det Norske Veritas or its subsidiaries or relies on any decision made or information given by or on behalf of themand in consequence suffers a loss, damage or expense proved to be due to their negligence, omission or default, then Det Norske Veritas will pay by way ofcompensation to such person a sum representing his proved loss. * In the event Det Norske Veritas or its subsidiaries may be held liable in accordance withthe sections above, the amount of compensation shall under no circumstances exceed the amount of the fee, if any, charged for that particular service,decision, advice or information. * Under no circumstances whatsoever shall the individual or individuals who have personally caused the loss, damage orexpense be held liable. * In the event that any provision in this section shall be invalid under the law of any jurisdiction, the validity of the remainingprovisions shall not in any way be affected.

FOREWORD

DETNORSKE VERITAS (DNV) is an autonomous and independent Foundation with the object of safeguarding life, property and

the environment at sea and ashore.

DET NORSKE VERITAS AS (DNV AS), a fully owned subsidiary Society of the Foundation, undertakes classification and

certification and ensures the quality of ships, mobile offshore units, fixed offshore structures, facilities and systems, and carriesout research in connection with these functions. The Society operates a world-wide network of survey stations and is authorised

by more than 120 national administrations to carry out surveys and, in most cases, issue certificates on their behalf.

Certification Notes

Certification Notes are publications which contain principles, acceptance criteria and practical information related to the

Society's consideration of objects, personnel, organisations, services and operations, in connection with issuance of certificates

or declarations, which are not necessarily related to classification.

An updated list of Certification Notes is available on request. The list is also given in the latest edition of the Introduction-

booklets to the Rules for Classification of Ships, the Rules for Classification of Mobile Offshore Units and the Rules for

Classification of High Speed and Light Craft.

In Rules for Classification of Fixed Offshore Installations, only those Certification Notes which are relevant for this type of

structure have been listed.

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DETNORSKE VERITAS

CONTENTS

1. Scope ................................................................. ................4

2. Conformity Assessment of Design of Product Type......4

2.1 Procedure.........................................................................4

2.2 Conditions........................................................................4

2.3 Document to be submitted ............................................... 4

2.4 Material requirements......................................................4

2.5 Design requirements ....................................................... .4

2.6 Requirements to dentification of product type with

certificate.................................................. ............................. 4

2.7 Elements of Type Approval ............................................ 4

3. Conformity Assessment of Manufactured Products

(Production)........................................................ ................. 5

3.1 Product Certificates.................. ....................................... 5

3.2 Inspection and testing in the certification process:.......... 6

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1. ScopeType Approval is a procedure for certifying that the design of

a product type is in conformity with a set of predetermined

requirements.

This Type Approval Programme contains the requirementson which Det Norske Veritas normally bases its Type

Approval ofgas turbines used in propulsion or auxiliary

plants on board ships, and on offshore installations or in

industrial plants as generator or compressor driver.

The requirements are based on the Rules for Classification of

Ships and Mobile Offshore Units.

The procedure for assessment of conformity of manufactured

products (production) is not part of the scope for the Type

Approval Programme.

2. Conformity Assessment of Design ofProduct Type

2.1 ProcedureThe type approval procedure consists mainly of the following

steps:

- Design assessment- Type testing- Certificate retention survey2.2 ConditionsA manufacturer applying for type approval of a gas turbine

model is to have a quality system (QS) according to ISO

9001. Equivalent systems will be specially considered.

2.3 Document to be submittedDocumentation shall be submitted in triplicate in connection

with the design assessment. For a complete list of the

documentation that are to be submitted, reference is made to

DNV Rules Pt.4, Ch.2. The extract below indicates the most

important issues.

- plans showing the general arrangement and description ofthe design features.

- drawings of the rotating parts as well as other highlystressed parts.

- schematic drawing of the lube oil and fuel oil systems.- particulars regarding stress- and temperature levels of

critical components, by means of finite element analysis.

- results of vibrational analysis of the gas turbine, givingboth rotor dynamics and blade natural frequencies.

- design specification for the control system superior to thegas turbine control system.

2.4 Material requirementsMaterial certificates are required for blades, shafts, disks,

interstage couplings (tie bolts) and combustors. Normally,

DNV accept all international standards on (gas turbine

intended) material as a basis for the type approval. National

standards, internal codes etc. will be individually accepted.

Properties of materials and also the material certificates are

to be available through the manufacturers quality system.

2.5 Design requirementsThe design will be evaluated with respect to the applicable

DNV requirements as given in the Rules Pt.4 Ch.1 and 2.

The objective of the design assessment is to assure DNVC

that the engine meets the requirements, and to establish any

limitations to operation.

The assessment will mainly focus on the engine safety withrespect to operating personel and ship/installation site, and

engine reliability. Hence, areas of great importance are

component strength and lifetimes, control system parameters

and engine system interfaces. The manufacturers own

calculations will form a basis in the assessment procedure, as

well as any documentation on the reliability and availability

of the engine in question.

2.6 Requirements to dentification of product typewith certificate

The product is to be provided with visible marking, giving at

least the following information :

- Manufacturers name or trade mark- Technical data necessary for the application- Type designation under which the product is type

approved

The marking is to be carried out in such a way that it is

visible, legible and indelible throughout the anticipated life

of the product, and that the marks can be traced back to the

Type Approval Certificate.

2.7 Elements of Type Approval2.7.1 Design assessmentThe design assessment is carried out to assess that the design

of the product type is in conformity with given design

requirements stated in 2.5.

2.7.2 Type testingThe scope of a type test is to verify the ability of a product to

meet specified requirements.

In particular, the main objective of the Type Testing of gas

turbines is to verify the products performance, and to verify

computer calculated properties, e.g. natural frequencies andvibration levels. The type testing will to the extent possible

be conducted in conjunction with the manufacturers own

testing.

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The testing should be performed in accordance with an

appropriate Test Code. The actual code shall be agreed upon

by the client and DNV prior to the commencement of the

testing. Preferred Codes are:

- ISO 2314 - Gas Turbine Acceptance Tests.- ANSI/ASME PTC 22 - Performance Test CodesThe testing is to include a start test, a mechanical running test

and a performance test as outlined below.

Start test: The start test shall include 5 starts from

standstill, and also restarts after being shut down from full

power.

Mechanical running test: The mechanical running test is

performed in order to assure that no damage occurs to the

engine and that tested functions and operating limits are

within specified limits. Vibration levels are also to be

measured and shall not exceed the pre-set requirements

agreed on by the parties.

Performance test: The performance test is conducted

with the object to assure that the engine meets the stated

power output and thermal efficiency, and that the control and

monitoring system works satisfactorily. The engine shall run

for at least 4 hours at stabilised conditions at max. continuos

power.

For details concerning the test procedures, reference is made

to DNV rules for gas turbines Pt.4, Ch.2.

Additional testing: Depending on the gas turbines service

experience, its accumulated in-service hours, and whether theengine has been used for similar operations earlier (similar to

the type approval conditions), DNV may, in addition to the

type testing, require in-service testing.

Gas turbines of novel design will have to accumulate 2500

hours in service before a Type certificate can be issued.

2.7.3 Type Approval CertificateWhen the design assessment and the type testing are

successfully completed a Type Approval Certificate will be

issued to the manufacturer stating conformity of the design of

the product type.

The Certificate is given a validity period of normally 4 years.

2.7.4 Certificate retention surveyThe scope of the certificate retention survey is to verify that

the conditions stipulated for the Type Approval is complied

with and that no alterations are made to the product design or

choice of materials.

If regular DNV product certification of gas turbines takes

place during the validity period of the Type Approval

Certificate, the retention survey can be combined with the

product certification survey.

The main elements of the certificate retention survey are:

- witnessing of tests or inspection of the product, selectedat random from the production line and examination of

the recording given in the internal quality system

documentation.

- review of type approval documentation.- review of possible changes in design, materials and

performance.- ensure traceability between manufacturer's marking and

Type Approval Certificate.

2.7.5 Renewal of Type Approval CertificateAt least three months before the period of validity expires,

the certificate-holder has to apply for renewal of the

certificate.

Upon receipt of the request for renewal, Det Norske Veritas

will perform a renewal survey which has the same content as

the certificate retention survey stated in 2.7.4.

The survey report will constitute the basis for renewal of the

Type Approval and the issuance of a new certificate.

3. Conformity Assessment of ManufacturedProducts (Production)

3.1 Product CertificatesEach gas turbines is to be delivered with a product certificate

when intended for use on board a DNV classed vessel.

For the first Gas Turbine to be delivered, the product cer-

tification will consequently coincide with the issue of thetype approval certificate. The consecutive delivered Gas

Turbines will normally be certified on a less extensive basis

than what is described in this type programme (The

certification process will include inspection and testing

through the manufacturing process, combined with workshop

testing at completion. This product certification, and its

extent, is to be agreed upon in a Manufacturing Survey

Arrangement (MSA) as described below).

Manufacturing Survey Arrangement:

A Manufacturing Survey Arrangement (MSA) shall be set up

by the manufacturer and the local DNV station.

An MSA is a signed agreement between DNV and the

manufacturer with the objective to clarify:

a) The extent of the required inspection and testing forspecific range of material, components and systems, and

the respective acceptance criterias.

b) To which extent and under which conditions themanufacturer may perform all or part of the required in-

spection and testing without the presence of a DNV

surveyor.

The content of an MSA should reflect the complexity of theproduct and the quality system implemented by the

manufacturer to ensure the consistency in quality during

production.

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3.2 Inspection and testing in the certificationprocess:

The essential testing during the fabrication phase is as

follows. The presence of a DNV surveyor in all or some of

the mentioned tests, shall - as noted above - be agreed upon

in the MSA.

- test of material properties- pressure testing of pressurised equipment.- surface crack detection, by means of NDT is required for

the following:

- shafts (in way of stress raisers)- hubs (in way of stress raisers)- shrink fit surfaces- welds in power transmitting parts- welds in casing of bearings (min. 10% to be tested)- balancing of rotating elements, both separately and

assembled.

- spin test of compressor and turbine rotors- certification testing of gas turbine (or gas generator

separately). This test will be based on the manufacturers

Factory Acceptance Test.

Reference document:

The following document constitutes the formal basis on

which this type approval programme has been issued:

Certification Notes 1.2

Documents

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