The industry-standard ambient air temperature is 40°C. It can be higher, up to 65°C, in special places such as the ship boiler room uptake. The maximum permissible operating temperature depends on the class of insulation used in the equipment.

For example, a temperature rise of 80°C is permitted in equipment’s with class B insulation. In 40°C standard ambient air, it would have an operating temperature of 80°C + 40°C = 120°C. For some insulation’s, such as NomexTM, the allowable operating temperature can be up to 200°C.
The temperature rise is determined by the cooling medium and the surface area available for dissipating the internal power loss on ship system that heats the equipment body.

Common Aspects of Power Equipment

Air-cooled ship equipment dissipates the internal heat mostly by convection and radiation, and negligibly by conduction. For electrical equipment on ship normally operating around 100°C, the temperature rise above the ambient air is approximately given by:

ΔT˚C = K × (watts)0.8 (3.23)

where watts = power loss to be dissipated and K = constant for a given body.

The post Ship electrical equipment and temperature rise under load appeared first on Electro-technical Officer (ETO).

British C.O.C or British C.E.C is needed for the role CVs: andrew.c@worldwide-rs.com

The post ETO job on Research Vessel appeared first on Electro-technical Officer (ETO).

ETO on AHTS DP1

-LOCATION: Saudi(ARAMCO)

-DURATION: 3+-1

-SALARY: 130$ per/day

SHOULD BE: Marlins Test not less than 80% on each position is a must , age limit 50 y/o.

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Terms are 6k-6.5k dollars a month with a 13th month bonus.
No rotation but offering 40 days holiday and long weekends.
Great owner with light usage and a nice crew atmosphere on-board.
Experience in electronics and AV/IT
Start on or before 7th of February for departure to Florida
Must have b1/b2
Own Cabin

Apply to freddie@wilsonhalligan.com

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When two copper wires connected to a battery are placed in a beaker containing a salt water solution, current will flow through the solution. Air bubbles appear around the wires as the water is changed into hydrogen and oxygen by electrolysis.
Electroplating uses the principle of electrolysis to apply a thin coat of one metal to another metal. Some practical applications include the tin-plating of steel, silver-plating of nickel alloys and chromium-plating of steel. If two copper electrodes connected to a battery are placed in a beaker containing copper sulphate as the electrolyte it is found that the cathode (i.e. the electrode connected to the negative terminal of the battery) gains copper whilst the anode loses copper.

The post Chemical effects of electricity appeared first on Electro-technical Officer (ETO).

– Unfortunately only candidates based in the UK will be considered for the role due to mobilisation

– Please email CV to Jak.stacey@selectoffshore.com

The post New job for ETO (Electrician) Offshore appeared first on Electro-technical Officer (ETO).

Type of vessel: PSV DP 2 –

Salary: 170 USD per day –

Contract duration : 2 months –

Candidate MUST have DP Maintenance –

Experience: 12 months in rank on the same type of vessel –

English: 80% Marlins test –

Operation Area: Tunisia –

Joining date: ASAP

The post New job for ETO (Electrician) on PSV DP 2 vessel appeared first on Electro-technical Officer (ETO).

Open Circuit problem on ship transformer

If one of the windings in a transformer develops a break or “open” condition, no current can flow and therefore, the transformer will not deliver any output.

The symptom of an open-circuited transformer is that the circuits, which derive power from the transformer, are de-energized or “dead.”

Use an AC voltmeter or DMM to check across the transformer output terminals.

A reading of 0 V indicates an open circuit.

Then take a voltage reading across the input terminals. If voltage is present, this indicates that one of the transformer windings is open. However, if there is no voltage reading on the input terminals either, then the open must be somewhere else on the line side of the circuit; possibly a disconnect switch is open.

WARNING!

Make absolutely certain that your testing instruments are designed for the job and are calibrated for the correct voltage. Never test the primary side of any transformer over 600 V unless you are qualified, have the correct high-voltage testing instruments, and the test is made under the proper supervision.

However, if voltage is present on the line or primary side and no voltage is on the secondary or load side, open the switch to de-energize the circuit, and place a warning tag (tag-out and lock) on this switch so that it is not inadvertently closed again while someone is working on the circuit.

Check ships transformers condition

Disconnect all of the transformer primary and secondary leads and check each winding in the transformer for continuity (a continuous circuit), as indicated by a resistance reading taken with an ohmmeter.

Continuity is indicated by a relatively low resistance reading on control transformers, while an open winding will be indicated by an infinite resistance reading (OL or 1). In most cases, such small transformers will have to be replaced, unless of course the break is accessible and can be repaired.

High Voltage Megohmmeter Digital Insulation Resistance Tester 250V~5000V

The Best Offer

High Voltage Megohmmeter Digital Insulation Resistance Tester 250V~5000V

The Best Offer

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