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§ huge SAVINGS of capitals: § MAINTENANCE FREE § LOW energetic costs § LIFETIME DURATION § less electric power needed § ELECTRIC current flow INTERRUPT § WITHOUT technical CHARACTERISTICS ALTERATION
§ O-RINGS SEALING SYSTEM
§ RECTANGULAR SHAPED SEALING
SYSTEM
§ U – SHAPE SEALING SYSTEM
Mechanical assembly needed to induce the right deformation
2 or 4 O-Rings between metal and insulating
Deformation/compression required is reached while compressing O-Rings against the rigid INSULATING spacer
a surface load higher than internal pressure
RESULT
TIGHT SEAL
ONE OF THE POSSIBLE SIDE EFFECTS IN THE LONG TERM COULD BE
FLUID LEAKAGE
O-Ring-walls rubbing rubber overheating O-Rings wearing and tearing
Surface load decreases - due to O-Rings shape deformation- up to becoming less than the internal pressure LEAKAGE
ABRASION
• Shaping
• Dimensioning
• Finishing operating pressures
• Temperatures
cause
O-Rings tear off
The structure deforms material looses flexibility
Surface load “P1” becomes less than pressure “P”,
FLUID LEAKAGE
EXTRUSION
Gas saturates the O-Ring at a certain pressure. If pressure suddenly decreases, gas gets rapidly expelled. That previously trapped in nano cavities expands violently O-Rings causing swell-up and bubbles
Explosive decompression could generate blisters, or tears O-Ring shape is deformed
Surface load becomes less than pressure, causing FLUIDS LEAKAGE.
EXPLOSIVE DECOMPRESSION
STRONG HOLDS
MICROSCOPIC PRECISION
STRICT TOLERANCES.
STRUCTURAL DEFORMATIONS
NOT WATERPROOFED
EXTRUSION
SHORTENING
WEAK POINTS:
LACERATIONS
CHEAP
NO PARTICULAR EQUIPMENTS
OF EASY PROVISION
SYMMETRIC SYSTEM
NO FAST PRESSURE CHANGES
One rectangular shaped gasket hardly compressed among the metallic surfaces, the metal and the insulating spacer
CHEAP EASY TO ASSEMBLY.
NO SURFACE FINISHING
WATER PROOFED
NO EXPLOSIVE DECOMPRESSION
NO EXTRUSION
SHORTENING
PRESSURE APPLICATION CIRCLE IS VERY HIGH
SPECIFIC EQUIPMENTS AND MOULDS
NON-SYMMETRIC SEALING SYSTEM
STRONG HOLDS WEAK POINTS:
Even widely used they experienced some inconveniences
NOT RECOMMEND for very
HIGH PRESSURES.
NUOVA GIUNGAS In the 70s, started to invest in R&D
to design new more efficient solutions. Time is ripe for the
U-shape sealing system
RGD Rapid gas decompression (Explosive Decompression)
17
Increasing the level of groove fill (≥ 90%)is one way to improve the resistance of a sealing elastomer
compound to RGD effects
In classical O-RING system, higher levels of fill may not be appropriate
for service ! O-ring must be fill max ≈2/3 of groove.
O-ring fill ≈2/3 of groove
DNV rules say …
20
O-RING SEALING SYSTEM PRIOR AND AFTER ASSEMBLY
DNV RULES REQUIRE AED/RGD CERTIFICATION FOR O-RINGS BECAUSE THE SYSTEM ARE SUBJECT TO RGD/ED EFFECT
SYSTEM ARE ENCLOSED IN A COMPLETELY CONFINED SPACE!
DNV RULES DO NOT REQUIRE AED/RGD CERTIFICATION BECAUSE THE SYSTEM ARE
NOT SUBJECTED TO RGD/ED EFFECT.
NUOVA GIUNGAS SEALING SYSTEM PRIOR AND AFTER ASSEMBLY
We have check i f i s t rue…
With comparative test based on NORSOK M710:2001
The Tests was carried out at the same time and in the
same condition on O-RING sealing system and on
NuovaGiungas U-Shape system manufactured with
standard FKM Compound (NOT AED!)
Test condition, fluid media, pressure and cycles: § Test Gas Mixture: 10% CO2 in CH4 § Test Temperature: 100°C § Test Pressure: 150 bar § The initial exposure period at 150 Bar: 72 hrs § decompression rate: 20 - 40
Bar/min. § Holding at atmospheric pressure(each cycle): 1 h (approx) § Holding at 150 Bar (each cycle): ≥ 23 hrs (+/-
1hrs) § Decompression cycles: 10
U-shape sealing system
TEST APPARATUS
25
GAS
O-RING samples
U-SHAPE samples
O-RING
Equivalent to NORSOK RATING#4
RGD results
U-SHAPE
Equivalent to
NORSOK RATING #0
RGD results
Nuova Giungas has developed different rubber compound § SUITABLE FOR: § GAS § OIL § STEAM § LOW TEMPERATURE § HIGH TEMPERATURE § AND OTHERS …
… and even if the system is not subject to the explosive decompression phenomena, a compound tested to Norsok M-710
NORSOK RGD
NGPR1201
NORSOK AGEING TESTS
Change in properties against time and temperature for Arrhenius model
Arrhenius model for life prediction
References
The NORSOK tests was carried out according to NuovaGiungas procedure N° 11522143
Test report N° 11511221
O-ring low pressures
small diameters
no bending, no tensile, no torsion and no compression
Rectangular
Only medium pressure.
U-SHAPE
NO SERVICE LIMITATIONS
THE VERY HIGH INVESTMENT IN SEARCH OF MATERIALS, EQUIPMENTS AND MOULDS
HAS BEEN SATISFYINGLY PAID BACK
A LESS EFFICIENT PRODUCT STRONGLY UNDERMINE, ORIGINAL SAVINGS.
A WIDE RANGE OF PRODUCTS ALWAYS AT STOCK …
BUT THAT'S JUST THE BEGINNING
10 BAR
25 BAR 100 BAR
ALL YOUR WISHES ARE OUR JOB
WE ARE ABLE TO MANUFACTURE JOINTS SUITABLE FOR ALL YOUR REQUESTS
WE HAVE ALWAYS SATISFIED OUR CLIENTS …
And we keep on doing it with our KNOWLEDGE able TO MEET every kind of REQUIREMENTS
NO LIMITS ON :
•Pressures
•Sizes
•Fluids
128” – WATER SERVICE
88” PN 100 BENI HAROUN PROJECT (ALGERIA)
48” API 5L X100 SAIPEM – TAP PROJECT
GORGON UPSTREAM PROJECT - AUSTRALIA
DUPLEX CARBON STEEL
WEST SACRAMENTO FORCE MAIN, PROJECT NEW NATOMAS & SOUTH RIVER PUMPING STATION
W A F A - M E L L I T A H
BLUE STREAM PROJECT
KPO PROJECT
TECHINT PERU - CAMISEA PROJECT
BELAYIM EGYPT
SAIPEM - MENZEL
SAIPEM - MENZEL
ALL OUR PROCESSES ARE UNDER STRICHT CONTROLS
ELECTRICAL TEST
DIELECTRICAL TEST
HYDRAULIC TEST
HYDRAULIC TEST
TENSILE TEST
TORSIONAL TEST
BENDING TEST
H O L I D AY T E S T
MAGNETIC TEST
MAGNETIC TEST
IMMERSION IN SALINE SOLUTION
… AND MANY OTHERS ACCORDING TO CLIENT REQUEST
R&D AND TECHNOLOGY AT YOUR SERVICE!
NUOVA GIUNGAS srl 41043 – Formigine Modena Italy Via A. Moro 26,28 Tel: +39 059 578611 Fax: +39 059 570633 E-mail [email protected] URL : www.nuovagiungas.com