In The Name OF God

Storage Tank Design

ATM LPS

AWWAAPI BS EN

LPS

API ENAWWA 650BS

2654 EN

14015API 620

EN 14620

P<2.5 Psi 2.5 < P < 15 Psi

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TYPES OF STORAGEPRESSURIZED STORAGESEMI-REFRIGERATED STORAGEATMOSPHERIC PRESSURE STORAGE

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BUTANE-0.5

BUTADIENE-4.5

AMMONIA-33

PROPANEPROPANE-42

PROPYLENE-47

ETHANE-88

ETHYLENE103-103

METHANE-161

LNG-162NITROGEN

-195www.hedcoint.com

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•Containment addresses the question:Wh t if th t k l k ?What if the tank leaks?

SINGLE CONTAINMENTDOUBLE CONTAINMENTDOUBLE CONTAINMENTFULL CONTAINMENTMEMBRANE TANKMEMBRANE TANK

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⑥⑤ ⑦⑤

① ⑧④ ②

③④ ⑨1 primary container (steel) 6 roof (steel)

3 foundation4 foundation heating system

7 loose fill insulation8 outer steel shell (not capable of containing liquid)9 bund wall

2 bottom insulation

5 suspended roof (insulated)

⑦⑥ ⑦ ⑧⑩① ⑨②③④ ⑤③

2 secondary container (steel or concrete)6 suspended roof (insulated)7 roof (steel)

1 primary container (steel)2 secondary container (steel or concrete)

4 foundation5 foundation heating system

7 roof (steel)8 loose fill insulation9 outer shell (not capable of containing liquid)

10 cover (rain shield)

3 bottom insulation

1 primary container (steel)2 secondary container (steel)

5 suspended roof (insulated)6 roof (steel)

2 bottom insulation3 foundation4 foundation heating system

7 loose fill insulation8 concrete roof9 pre-stressed concrete outer tank (secondary container)

VAPOUR DISPERSION SCENARIO

CREDIBLE SPILL (by EN1473) for SINGLE CONTAINMENT

Tank CompleteTank Complete Failure

Public F ilitiV

Plant fence

FacilitiesVapor

2.5 ～ 3 kmwww.hedcoint.com

CREDIBLE SPILL （by EN1473) for DOUBLE CONTAINMENT,

Roof Collaspe

Plant f

Public Facilities

fence

800 m

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CREDIBLE SPILL (by EN1473) for FULL CONTAINMENT

PRV

Public Plant fence

Facilities

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The tank shall be designed so that:under normal operating conditions, the liquid and the vapour is contained;and the vapour is contained;it can be filled and emptied at the specified rates;boil-off is controlled and in exceptional cases can be relieved to flare or vent;pressure operating range specified is p p g g pmaintained;ingress of air and moisture is prevented, except in exceptional cases when the vacuum reliefin exceptional cases when the vacuum relief valves have to be used;boil-off is as specified and condensation/frost on the external surface is minimised Frost heave ofthe external surface is minimised. Frost heave of the foundation shall be prevented;

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Mechanical designTh l d igThermal designBoil off rateInsulationInsulationFoundationFrost heaveFrost heaveRoll overCool downCool downIn tank pump

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Insulation

Base WallR fBase

Perlite bl k

Mineral wool

Hard wood

Foam glass

Wall

Loose perlite PUF

Roof

block wool

FiberglassLoose perliteperlite

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60

40

50

g/cm

2

30

40

stre

ngth

k

10

20

ompr

essi

ve

0.3125

0.4375Perlite Cement Ratio

00 10 20 30 40 50

co

dayy

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DIFFUSE

DIRECT

DIFFUSE

GROUND REFLECTIONwww.hedcoint.com

MAX ALLOWABLE BOIL-OFF RATE = 0.05% CONTENT WEIGHT/DAY = 417 Kg/hr

MAX DESIGN BOIL-OFF RATE = 0.95*417=396 Kg/hr

CALC. BOIL-OFF RATE = 382 Kg/hr

THERE ARE TWO DISTINCT TYPES OF BASE SLAB

ON GROUND TYPE

ElEVATED TYPE

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On ground type-Good soil condition required.

Elevated type- Poor soil condition

-Concrete slab required-Electric heaters are installed

into the slab to avoid frost

- Piles are required- Large initial investment

Small maintenance costinto the slab to avoid frost heave.

-Small initial investmentLarge running cost

- Small maintenance cost - Elevated height is around

1.0 m to 1.5 m -Large running cost

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VENTED GAS LNG

BOG

SPRAY RING

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Thank YouThank You

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