NON DBDS Archives - Sea Marconi

Treatment Technologies for Transformers’ Corrosive Sulphur – A great saudi workshop by GCC Lab and Sea Marconi

seamarconi — Fri, 30 Sep 2022 13:42:05 +0000

We are very honored to have participated in the workshop “Treatment Technologies for Transformers’ Corrosive Sulphur” organized by our saudi partner GCC Lab in Damman (Saudi Arabia) the ²⁶ and ²⁷ Sept. 2022. The event was attended by 50 engineers/technicians from different clients of GCC Lab and was focused on Asset Integrity Management.

Sea Marconi attended the event with 4 very high profile speakers: Cristina Tumiatti (Global Business Development Director), Riccardo Actis (Chief Operation Manager), Riccardo Maina (laboratory manager), Simone Maina (project manager) confirming its international leadership on the corrosive sulfur issue in oils and electrical transformers.

The post Treatment Technologies for Transformers’ Corrosive Sulphur – A great saudi workshop by GCC Lab and Sea Marconi appeared first on Sea Marconi.

Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2013

seamarconi — Fri, 31 May 2013 14:50:34 +0000

Scenario

Nameplate data of transformer:

Transformer: grid transformer
Manufact: xxx
Year: 1957
Power [MVA]: 50
Voltage [KV]: 225
Oil Mass [Kg]: 38.000
Oil type: blended mineral oil

Transformer contaminated by PCBs and corrosive sulfur compounds

Solution

Selective depolarization treatment (Chedcos) in order to remove corrosive sulfur compounds and dehalogenation treatment (CDP Process®) in order to remove the PCBs from oil and transformer. The treatment was performerd on-site and on-load (transformer in operation and fully load during the treatment).

	Before the treatments	After the treatments Sea Marconi
PCB* [mg/Kg]	81	20
Total sulfur [mg/Kg]	21,600	20,500
TCS (total corrosive sulfur) as DBDS Eq. [mg/Kg]	140	< 10
CCD	Corrosive	NOT Corrosive
DBTP [mg/Kg]	380	280
TAN [mg KOH/g]	0,096	< 0,03
IFT	19,5	26
Color	6,9	3

*The agreed guarantee was PCBs < 40 [mg/Kg]

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Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2012

seamarconi — Fri, 31 May 2013 14:50:06 +0000

Scenario

Hydro power plant with 3 GSU transformers

Nameplate data of the transformer:

Manufact: xxx
Year: 1965
Power [MVA]: 80
Voltage [KV]: 220
Oil mass [Kg]: 35.000
Oil type: naphthenic blended

Solution

Selective deplarization treatment (Chedcos) in order to remove the corrosive sulfur compounds and dehalogenation treatments (CDP Process®) in order to remove the PCBs from the oil and the transformers. the tratments were performed on-site and on-load (transformer in service and fully load during the treatment).

	Before the treatment	After the treatment
PCB* [mg/Kg]	96	26
TCS (total corrosive sulfur) DBDS Eq. [mg/Kg]	64	< 10
CCD	Corrosivw	NOT Corrosive
DBTP [mg/Kg]	16	14
TAN [mg KOH/g]	0,194	0
TgD	0,03737	0,05144

*The agreed guarantee was PCBs < 50 [mg/Kg]

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Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2010

seamarconi — Fri, 31 May 2013 14:49:40 +0000

Scenario

Steel Factory: 8 Equipment

Nameplate data of the transformers:

Namufact: xxx
Year: 1973
Power [MVA]: 85
Voltage [KV]: 63
Oil mass [Kg]: 18.150
Oil type: naphthenic blended

Oil Fingerprint. It shows the presence of sulfur compounds responsible for oil corrosivity

Solution

Selective depolarization treatment (Chedcos) in order to remove the corrosive sulfur compounds and dehalogenation treatments (CDP Process®) in order to remove the PCBs from the oils and transformers. the treatments were carried out on-site and on-load (transformer in service and fully load during the treatments).

	Before the treatment	After the treatment
PCB* [mg/Kg]	151	17
TCS DBDS Eq. [mg/Kg]	172	< 10
CCD	Corrosive	NOT Corrosive
Cu	32	5,18
TAN [mg KOH/g]	0,131	0,01
Color	6.5	2

*The agreed guarantee was PCB < 50 [mg/Kg]

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France 2012 Removal of PCBs and non DBDS corrosive sulfur (C2)

seamarconi — Fri, 31 May 2013 14:49:10 +0000

Scenario

Il classico trattamento con terre follari si dimostra totalmente inefficace contro lo zolfo corrosivo

Caratteristiche tecniche del trasformatore:

Costruttore: xxx
Anno: 1969
Potenza [MVA]: 14
Tensione [KV]: 63
Massa olio [Kg]: 4.200
Tipo di olio: Esso Univol 54

Oil Fingerprint. Presence of sulfur compounds without DBDS

Il trattamento con terre follari (NON da Sea Marconi) non ha prodotto alcun risultato contro lo zolfo corrosivo

After the treatment with fuller earth remain signs of corrosivity

Soluzione

Trattamento di depolarizzazione selettiva (Chedcos) per la rimozione dei composti solforati (NON DBDS) responsabili della corrosione.

The Selective depolarisation treatment proves effective against corrosion unlike that with fuller earths

	Prima dei trattamenti	Dopo il trattamento con terre follari	Dopo il trattamento di depolarizzazione by Sea Marconi
Colore	4	3.7	1
TCS DBDS Eq. [mg/Kg]	55	51	< 10
CCD	Corrosivo	Corrosivo	NON Corrosivo
DBTP [mg/Kg]	–	50	45
TAN [mg KOH/g]	0,25	0,035	0,01
DF	–	0,01879	0,012
IFT [mN/m]	–	25,3	41

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Removal of non-DBDS corrosive sulfur C2 Italy 2011

seamarconi — Fri, 31 May 2013 14:48:50 +0000

Scenario

Thermal power plant with 8 GSU transformers

Nameplate data of the transformer:

Manufacturer: xxx
Power [MVA]: 370
Voltage [KV]: 400
Oil mass [Kg]: 58.000
Oil type: blended oil

The analysis and diagnosis of the 2011 showed:

Total sulfur = 5700 mg/Kg
TCS (Total Corrosive Sulfur) = 104 mg/Kg (DBDS eq.)
CCD Test = corrosive
DBTP (dibenzothiophene) = 42 mg/Kg

Step 2

August 2011: failure with explosion and fire

Oil Fingerprint. Sulfur corrosive compounds

Solution

Diagnosis, prognosis, with a recommendation to perform the selective depolarisation treatment (Chedcos) for the removal of sulfur compounds (NOT DBDS) responsible for the corrosion.

The post Removal of non-DBDS corrosive sulfur C2 Italy 2011 appeared first on Sea Marconi.

Removal of non-DBDS corrosive sulfur (C2) Midlle East 2009

seamarconi — Fri, 31 May 2013 14:48:20 +0000

Scenario

Thermal power plant with 8 GSU transformers

Nameplate data of the transformers:

Power [MVA]: 175
Voltage [KV]: 400
Oil type: naphthenic oil

C2 – Corrosion not caused by DBDS

Step 1

The diagnosis in the 2009 showed:

Total sulfur = 200 mg/Kg
TCS (Total Corrosive Sulfur) = 157 mg/Kg (DBDS eq.)
CCD Test = corrosive
IFT = 19 mN/m
DBTP = 38 mg/Kg

Step 2

Failure in the 2013

Step 3

Post failure analysis in progress…

IFED, oil fingerprint

Step 4

Sea Marconi recommended the selective depolarization treatment (Chedcos) in order to remove the sulfur compounds (NOT DBDS) responsable for the corrosion.

The post Removal of non-DBDS corrosive sulfur (C2) Midlle East 2009 appeared first on Sea Marconi.

NON DBDS Archives - Sea Marconi

Treatment Technologies for Transformers’ Corrosive Sulphur – A great saudi workshop by GCC Lab and Sea Marconi

Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2013

Scenario

Solution

Before the treatments

After the treatments Sea Marconi

Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2012

Scenario

Solution

Before the treatment

After the treatment

Removal of PCBs and non-DBDS corrosive sulfur (C2) France 2010

Scenario

Solution

Before the treatment

After the treatment

France 2012 Removal of PCBs and non DBDS corrosive sulfur (C2)

Scenario

Il trattamento con terre follari (NON da Sea Marconi) non ha prodotto alcun risultato contro lo zolfo corrosivo

Soluzione

Prima dei trattamenti

Dopo il trattamento con terre follari

Dopo il trattamento di depolarizzazione by Sea Marconi

Removal of non-DBDS corrosive sulfur C2 Italy 2011

Scenario

The analysis and diagnosis of the 2011 showed:

Step 2

Solution

Removal of non-DBDS corrosive sulfur (C2) Midlle East 2009

Scenario

Step 1

Step 2

Step 3

Step 4