Project Report Rapport de projet 111111111111

Canada. (Dept of)Fisheries and
Oceans. Scotia-Fundy Region.
Fisheries Development Branch
PROJECT REPORT
Project Report
Rapport de projet
DFO - Librarl / MPO - BibliothOque
111111111111
10018580
Fisheries Development and Fishermen's
Services Division
Division du developpement des !Aches
et services aux pecheurs
Fisheries and Habitat Management
Gestion des peches et de I' habitat
Scotia- Fundy Region
Region Scotia-Fundy
Halifax, Nova Scotia
Halifax ( Nouvelle- Ecosse
Peches
I I Fisheries
and Oceans et Oceans
CanacM
FISHERIES DEVELOPMENT AND FISHERMEN'S SERVICES DIVISION
P.O. Box 550, Halifax, Nova Scotia
B3J 2S7
This is an unedited consultant's report financed in full or in part by the
Fisheries Development and Fishermen's Services Division, Scotia-Fundy
Region. The views expressed in this report are those of the consultant and
not necessarily those of the Division.
D.S.S. FILE NO.:
11SC.FP111-6-0386
PROJECT OFFICER: W. K. Rodman, P. Eng.
(902) 426-6074
PROJECT REPORT NO. 148
REPORT ON A TRIP TO OBSERVE
THE TRANSVAC PUMP UNLOADING
OF AN R.S.W. GROUNDFISH TRAWLER
by
Eyretechnics Limited
Suite 207, 11 Morris Dr.
Dartmouth, Nova Scotia
B3B 1M2
October 1988
88/06/13
REPORT ON TRIP TO OBSERVE TRANSVAC
PUMP UNLOADING OF GROUNDFISH TRAWLER
Date:
88/06/10
Place:
Lahave Seafoods Ltd., Lahave, Lunenburg Co.
Vessel: "Island Princess"
LOA:
96'-0"
Capt.:
R. Deveau
The undersigned travelled to Lahave on Friday 88/06/10 to observe the
unloading, via Transvac pump, of the RSW groundfish trawler "Island
Princess". Built in 1981 originally as a herring seiner, converted in 1985
to groundfish trawler, the "Island Princess" is a well appointed, steel
vessel. Its 4 separate RSW tanks employ upwelling recirculation to maintain
a water temperature of 28°F. As part of the conversion, 4 1015 lines, one
from each tank lead to a common 10"O line. Each branch 101 line is opened
or closed to the 1016 common line by automatic, pneumatically operated gate
valves. This common line goes to the Transvac pump located on the upper
deck, aft, port side. This is a double tank pump (model 2030) designed to
provide continuous unloading. The catch on the day of inspection was
60,000 lbs. of haddock, held in the two after most tanks. The average age
of the catch was 3 days. The average fish size was 22" long. The fish was
caught on the North Slope of George's Bank.
Upon inspection, the fish in the hold were firm, clean (though in the round)
and well preserved.
Having connected the pump discharge 101 line to the dewatering box ashore
the pump is started up, vacuum being drawn on one of the pump's two tanks.
Once completely evacuated the pump automatically switches over, causing the
second tank of the pump to draw a vacuum, whilst the first tank is
pressurized and the fish/water mix discharged ashore. On the occasion
observed the fish/water ratio was approximately 60%/40%. From the
1
dewatering box the fish go up a chain conveyor to a chute, thence to the
insulated fish boxes for transportation to the plant. The water from the
dewatering box returns to the fish tanks aboard. After unloading, the tanks
are emptied of their water at sea and washed down. Then they are refilled
with clean seawater, which is then refrigerated. Upon arrival at the
fishing grounds the water is cold enough to receive the catch.
On the day the author observed the unloading of the "Island Princess" the
Transvac pump initially proved uncooperative. While it would draw a vacuum,
it would not pressurize (and therefore discharge) its tanks. The captain
and crew were most apologetic. The pump was rapidly stripped apart and
checked, as were the vacuum pumps, piping, and valves. After about 45
minutes it was found that the automatic change over valve lever was simply
slipping on the chromed shaft of the valve. This shaft should be keyed,
splined or have some better means of locking shaft to the lever, other than
a small Allen screw. Within 2 minutes of finding the problem the pump was
fixed and operating at full capacity. This incident gave insight into two
important areas:
1.
The Transvac pump, while usually reliable, can be maintained with
relatively little trouble by the vessel's crew, using only the
most basic tools. A basic mechanical aptitude and some experience
with the operation and maintenance of the pump is required.
2.
The design of such inconsequential items as the valve shaft should
be addressed by Transvac Ltd. and improved.
Within one hour 60,000 lbs. of haddock had been unloaded (cod is
considerably slower to unload). In comparison a 52'-6" LOA iced groundfish
trawler (the"Morning Dove") was unloading by bucket at the same time.
Though the "Morning Dove" was a smaller vessel with a smaller catch, the
"Island Princess" was unloaded well before the "Morning Dove". Furthermore,
the difference in quality of the fish between the two boats was striking.
The fish from the "Island Princess" were firm, full bellied, straight, and
2
unblemished. those of the "Morning Dove" were soft, with sunken bellies,
and bruised from being thrown into the bucket thence into the insulated
boxes by shovels.
Captain Deveau had earlier expressed the opinion that fish that have been
through the Transvac pump were somewhat softer than those that haven't gone
through the pump. Upon investigation both Capt. Deveau and the author came
to the conclusion that the problem is being caused by the zig zag chute from
the dewatering box. The drop is almost vertical, for about 12'. The fish
hit the bottom chute which has only a shallow slope. The fish are basically
falling 12' vertically and landing on a metal surface nearly perpendicular
to their fall. This may be the cause of the reported "softness".
Capt. Deveau and the author tested fish after they had been through the pump
but before they had gone down the chute. These were found to be in
excellent condition.
The only problem, other than the perceived fish quality problem (mentioned
above), which Capt. Deveau mentioned, was the occasional freezing up of the
vacuum pump in winter due to moisture in the air. However, by putting a
moisture trap on the suction side of the pump this problem has now been
eliminated.
Capt. Deveau was most helpful and articulate in describing the pump's
operation, failings and strong points. In summation, he is quite happy
with it, though its price; with all the necessary piping, elbows, tees, etc.
of 10"0 aluminum does tend to make it in the $100,000 range for his vessel.
I would like to express my appreciation to Capt. Raymond Deveau and crew of
the "Island Princess" and Mr. David Himmelman of Lahave Seafoods Ltd., for
their help and cooperation.
3
APPENDIX
Photographs of visit to "Island Princess IV" to observe the unloading
of groundfish using a Transvac Pump.
4
PeNcEss IZ
sGa
ISLAND
UNLOADiNG AT LAW
5
FISI-I IN AFT \A./ELL
iS1-1 BEING WASI-IED INTO fLIAIN
IN SIDE THEFISH 1-kobSE
0
_J
2
J. THEcHA N CoNVENMCRuNINJIKIG UP A T
• •
456 FRolvi AFT WELL.
4
A VIEW INTO THE TOP OF A FULL FISH TANK.
NOTE:
3. THE id DIA. D1Sci4A E PIPE TO THE LEFT.
Z. THE 411 DIA. vvA.TE2
COMINIG IN 1.72OM
2k1 PIPE RUNNING
nPPE2
INSIDE ONE OF THE FISH TANKS.
OTE:
I.
DiA.
p,pc
,
\nitl:TER 2ETIN2 Q PIPE Z_LIN.1±..)1N.16.
AcenRc
BULZPEAL...).
Rcrik7c1m_ ATIktc5 f--;GATES 7:12_44:4A.1 eF"P'
LAPVJE_LLIQG FEOM Fi/NoZ
4\-7
101' DIA. DISC:i-IARGE PIPE
RuN1 KUM G DOW.) CENTRE
1.4
ALLEY, BETWEEN
NOTE:
A
ft k
Wul-,
VALVE AC
i_PP.E52 LEFT
11
2. id. DIA 152ANCI-1 LIMES
IF:2E0Ni LIMIT
L.C.)WE2 ZIGPT
7P \JAI. VP
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ts.J
PNOTO G'APP
diSCHA I2C;E PA P
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12
EASE oF FliZST CHuTE: -1-1-4I5 is wwEZE -7-1-iE FISH
A2E IZECE.ivinIC! 7)-kEt2 DANAAC-E
SIDE VLE.W cF c:_•-!uTES
VEZTICAL. L')ZOP
S'EC.C..)1■J
14
AiDICA-rinJCI
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MORI\ii1G C,NoVE, SknvELS Ato.)D oNALOAZIkIG
TC)
L..‘„c.zE -T' BEING 5..,A.IPPED ABC QD P•Z
L\Q LnAOINIG
15
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Canada. DFO. Fis. Dev. &
Fis. Ser. Div.
Project Report. No. 148
Report on a trip to observe
the transvac pump...
Canada. DFO. Fis. Day. &
Fis. Ser. Div.
Project Report. No. 148
Report on a trip to observe
the transvac pump...
t1j

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