Oil Mist Detector

Normal
0

false
false
false

EN-US
X-NONE
BN

MicrosoftInternetExplorer4

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:”Table Normal”;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:””;
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:”Calibri”,”sans-serif”;
mso-bidi-font-family:”Times New Roman”;}

  ¨   Maintenance & Checking accuracy of OMD
operation:

¥     
Light
scatter Type (QMI)

  • The light scatter device detector heads
    are set – up by the manufacturer.
    systems are self
    calibrating against deviation.

  • Maintenance consists of cleaning lenses and changing
    filters.
  •  The CPU has a self
    diagnostic facility which checks for errors.
  •  The device can be
    tested by using aerosol which mimics an oil mist at alarm level (2%) LEL.

¥     
Graviner
type

  • Alarms
    & slowdown are tested against a known concentration of mist
  • The lenses
    and mirrors should be cleaned periodically.
  • In this
    model the total mist concentration is measured with respect to clean air.
  • An
    alternative models draws samples through both references and measuring
    tubes which from C/C and atmosphere and compare the level of mist.

  ¨   Take to safeguard against the risk of C/C
explosion in the event of OMD become inoperative:

  • If the engine is not equipped with
    bearing temperature monitors linked to slowdown/shutdown, then in the
    event of the oil mist detector becoming inoperative, then subject to
    classification society rules, the machinery space cannot operate under UMS
    conditions and will have to be manned on a 24 hours watch keeping basis.
  • Because one of the important safety
    devices is now inoperative, extra vigilance will be required by the
    engineers on duty.
  • If bearing temperature probes are fitted,
    then these must be closely monitored.
  • The watch keeping engineer must use his
    senses of smell, hearing, sight and touch to check for any unusual noise,
    heat or smell which may indicate a potentially dangerous situation. In the
    event of any doubt, them the engine must be stopped for further
    investigation.
  • It will be even more important than ever
    to ensure that the engine is not overloaded.
  • The crankcase pressure should be closely
    monitored; a rise in pressure on a trunk piston engine will indicate
    excessive blow by from one or more units.

The
OMD should be investigated to establish the cause of failure, and necessary
spares ordered to rectify the problem as soon as possible. 

via Blogger http://ift.tt/2jPBHn8

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s