L.S.
Zoals ik al eerder opmerkte de TD van de ABAN Ice in Mumbai (India) vraagt op bepaalde tijden wat informatie, meestal over de DOXFORD maar ook soms over andere scheepszaken.
Ik krijg zo de indruk dat ze enigszins onzeker zijn over hoe het op te lossen
Vreemd want er zullen ontegenzeggelijk vele India Engineers zijn die ook in de Doxford periode, jaren vijftig tot zeventig met Doxford hebben gevaren in alle rangen op Engelse schepen, dus van mijn leeftijd.
Vermoedelijk zijn er nu alleen jonge mensen op de TD aanwezig, die de DOXFORD alleen kennen uit een boekje, zoals wij in onze tijd op de zeevaartschool?
Alle aandacht ging toen uit naar Sulzer Werkspoor en Stork
Hieronder één van hun vragen:
<quote> Onderwerp: ABAN ICE- Doxford
Dear Alfons,
Good Day !! Hope you are doing great !
We are looking for some expert help on ICE tail shaft inspections. ICE is undergoing
5 yearly Survey No. 12 and unfortunately we are not dry docking and need to complete what is possible and request for extension until end of contract in May 2020.
We have only 650 hours on our propulsion system after the last dry-docking in Singapore. And in the dock
we had installed a new tail shaft, new propeller and the lignum vitae was machined to suite the new shaft.
Now the ABS surveyor wants to check on the shaft drop with the divers (underwater) and we are not very sure on how to do this as we have not done before-
can you please throw some light and enlighten us with your vast knowledge and experience.
Thanks & Regards,
Arun
</quote>
Mijn antwoord hierop was het volgende :
Dear Arun,
On the first place I feel very honored that you contact me for some advice
When I sailed, started in 1952, with this kind of propeller shafts, lined in lignum vitae is a long time ago.
Most of my sea time I sailed with the Simplex system, the propeller shaft lined in a white metal bearing and running in an oil bath.
What I remember from the propeller shafts running in lignum vitae is that after renewing the worn out lignum vitae, new was installed and machined out on the right diameter depending on the propeller shaft diameter with a certain clearance, as you described.
The next dry-docking – mostly after 1 year – the clearance was measured and the packing on the foreside (engine room) was renewed
Therefore it look very strange to me that in the ABAN ICE case, the clearance must be taken for the ABS surveyor after 650 running hours with the new lignum vitae while the ship is afloat ?
But what I understand it is necessary for 5 year survey
The only possibility is that the diver takes the clearance with special measurement tool on the
“POKER GAUGE READING”, which is specially installed for that purpose,
see sketch
I hope that this reading also was taken in Singapore, so the ABS surveyor can compare both readings
So far my way of thinking in this matter
Will you please let me know final result, because I am still interested as an Engineer, in spite of my age (85)
Succes and Regards
Alfons
(klik op foto voor vergroting)
Achteraf blijkt dat ze toch gemeten hebben met gewone voelers en een jaar uitstel hebben gekregen
Vermoedelijk zijn er geen “Poker Gage Readings “ meer bekend?
Alfons