certification process of storage tank.pdf

8/10/2019 Certification process of storage tank.pdf

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resen e y ser em z

Industry and Certification Division

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WHO WE ARE

T RK LOYDU is an independent, impartial

classification, cer ca on, an

conformity assesment organization.

With its Marine and Industry Divisions provides wide range of services;

Classification and statutory surveys of new building and existing ships, and certification of marine materials and products.

Third party inspections, CE marking in pressure vessels, system certifications, type approvals are some of the businesses amongst the others.


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PHASES TO CERTIFICATION;

APPROVAL OF PROJECTS AND

INSPECTION OF FABRICATION

AND FINAL TESTSQUALIFYING OF

WELDING PROCEDURES AND


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APPROVAL OF PROJECTS AND CALCULATIONS ARE EXECUTED ACCORDING TO API 650, 653

We also use COADE software to verify the calculations and design,

o ana yse e s ruc ure we use program.

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BEFORE CONSTRUCTION OF A TANK IN THE WORKSHOP AND IN THE PLANT

EXAMINATION OF

QUALITY PLAN (ITP)

IS AN ESSENTIAL STEP NOT TO BE OVERLOOKED.

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QUALIFICATION OF WELDING PROCEDURES

Welding procedure qualification records must meet the requirements of Section IX of

the ASME Code.

Either AWS D1.1 or AWS D1.6 are also acceptable for ladder and platform assemblies, handrails, stairways, and other miscellaneous assemblies, but not their attachments to

.

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QUALIFICATION OF WELDERS

The welders and welding operators must be qualified in accordance with Section IX of

the ASME Code.

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INSPECTION OF MATERIALS;

STEEL PLATES

PROFILES

FLANGES etc.

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MARKING

To enable the various fabricated components to be assembled together correctly on site, each part has to be marked with a unique numbering

system.

Hard stamping may be used as well, but except for the plates less than 6 mm thick.

Marking also provides traceability of each piece of material.

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AFTER FORMING OF SHELL PLATES

RADIUS OF EACH PLATE MUST BE CHECKED

NOT TO SPEND MUCH TIME DURING THIS STEP, A PREFORMED PATTERN MODEL

MADE OF THIN METAL SHEET CAN BE USED.

PRIMER SHOULD BE APPLIED BEFORE TRANSPORTING THE SHEETS TO PLANT , AND INCASE OF NOT TO AFFECT THE QUALITY OF WELDS, ALL WELD FACES SHOULD BE

.

INCASE ANY DEFORMATION MAY OCCUR DURING TRANSPORT AND STACKING,

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CONCRETE RINGWALL, AND BOTTOM SURFACE ARE MEASURED BY MEANS OF TOTAL STATION DEVICE.

ANCHORS ARE CHECKED ,MATERIAL TYPELOCATION

Tensile test is required for each party of steel rods used in the concrete

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BOTTOM PLATES ARE SETTLED ACCORDING TO PLATE ORIENTATION SCHEME IN THE APPROVED PROJECT.

BOTTOM PLATES ARE WELDED AFTER CONSTRUCTING OF COARSES

LAP WELDED BOTTOM PLATES UNDER TANK

SHELL

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TWO TYPES OF TANK FLOORING ARE;

BOTTOM DOWN: Generally, bottom down is design for cone roof tanks. Centreof the flooring is installed with drain pit. Water in the tank is accumulated in the pit (lowest point of the bottom plate/floor).

BOTTOM UP:Generally, this type of design is used for floating roof tanks, 3 to 4 collector pits are installed, close to the shell plate. Each of the pit is provided with a water draw off line.

A slo e of 1:120 is suitable

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The erection procedure shall include the following steps:

(a) a hole shall be cut in the bottom plate or a sump shall be placed in the foundation before bottom placement;

(b) a neat excavation shall be made to conform to theshape of the drawoff sump, the sump shall be put in place, and the foundation shall be compacted around the sump

(c) the sump shall be welded to the bottom.

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ADJUSTMENT OF FIRST COURSE

UPRIGHTNESS, ROUNDNESS AND DIAMETER OF THE COURSE IS MEASURED MIN.AT 8 POINTS.

IT IS CONSIDERED THAT THE WELD SEAMS OF BOTTOM PLATES AND VERTICALSEAMS OF THE COARSE ARE NOT TO BE INTERSECT EACHOTHER

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ADJUSTMENT OF SECOND COURSE

UPRIGHTNESS, AND ROUNDNESS OF THE SHELL IS MEASURED MIN. AT 8 POINTS.

THEN VERTICAL WELDS ARE EXECUTED OF THE FIRST COURSE.

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, . .

THEN, VERTICAL

AND

CIRCUMFERENTIAL

WELDS

OF

THE

SECOND

COURSE

ARE

SUCH PRINCIPLE IS FOLLOWED FOR THE OTHER COURSES.

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FOURTH

THIRD

FIRST

SECOND

COURSE

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TYPICAL ANCHORAGE

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TYPICAL ANCHORAGE

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, . THEN VACUUM TEST IS PERFORMED.

Vacuum testing is performed using a testing boxapproximately 150 mm (6 in.) wide by 750 mm (30 in.) long with a clear window in the top, which provides proper visibility to view the area under inspection.

Durin testin , illumination shall be ade uate for proper evaluation and interpretation of the

test.

The open bottom shall be sealed against the . ,

valves, lighting and gauges, shall be provided as required.

A soap film solution or commercial, leak detection solution, applicable to the conditions, shall be used.

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plates to shell plates.

method , or alternatively, by agreement between the purchaser and the manufacturer, using the ultrasonic method. In addition to the radiographic or ultrasonic examination these welds are also visuall examined.

In general, radiographic inspection is required for shell butt welds, annular plate butt welds, and flush type connections with butt welds.

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TESTING OF THE SHELL

After the entire tank and roof structure is completed, the shell is tested by one of the following methods:

1 If water is available for testing the shell, the tank shall be filled with water as follows:

ito the maximum design liquid level; iifor a tank with a tight roof, to 50 mm above the weld connecting the roof plate or compression bar to the top angle or shell

2 If

sufficient

water

to

fill

the

tank

is

not

available,

the

tank may

be

tested

by painting

a o e o n s on e ns e w a g y pene ra ng o

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FIRE PROTECTION

Fire protection system shall be established according to the NFPA standards.

This s stem is ins ected durin manufacturin of the installation and after that

functions, and performance are examined.

System shall include;Foam based extinguishing,Water coolingMonitorsDike protection

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FIRE PROTECTION

For the cooling water rates the standards do not provide cogruent values.They only prescribe minimum water flow rates

API 2030 : 4.1 liters per minute per square meterNFPA 15 : 10.5 liters / min.m 2IP 19 : 2 liters / min.m 2

To be on the safe side for exposure protection we recommend and apply NFPA rate.

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CATHODIC PROTECTION

Both sacrificial anode system or impressed current system are acceptable.

The main standard for this ste is API 651.

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EARTHING

To minimize the accumulation of electrostatic charge and prevent sparks, all metal parts of the storage installation must be bonded together and earthed.

Maximum resistance to earth of 10 ohms is recommended.

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After completing all structure of the tank, for the surfaces of the weld seams

First, shotblasting then

primer paint should be applied before whole tank is painted.

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, .

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certification process of storage tank.pdf

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