Purifier Flashcards
1
Q
Purpose of the centrifugal purifier
A
Separate and remove water, solids, and emulsions from JP5 during stowage to service tank transfers
2
Q
What kind of purifier is it AKA?
A
A constant-efficiency type of separator. Same degree of efficiency at the end of a run as at the beginning
3
Q
Define centrifugal force ?
A
A force which impels a thing outward from a center of rotation
4
Q
Components of a purifier ?
x23 components
A
- frame
- brake
- speed indicator
- oil fill cap
- worm wheel and drive assembly
- spindle assembly
- bowl casing
- bowl cover
- feed tube assembly
- spring loaded T handle
- water discharge chamber
- inlet and outlet connection
- bowl assembly
- distributor
- intermediate disc
- top disc
- paring disc
- bowl top
- coupling ring
- discharge ring
- coupling nut
- A/C motor and controller
5
Q
Frame
A
It’s bolted to base plate and secured purifier to ship foundation.
- it houses all the drive components
6
Q
Brake
A
- Used to stop bowl rotation , emergency use only
- hand operated.
- handle up - brakes on
- handle down - brakes off
- brakes must be off prior to purifier operation
- brake drum is attached to drive assembly
7
Q
Speed indicator
A
- used to determine rotations per minute .
- button on cap provides a speed count
- operating speed for purifier in 146-152 BPM. Bumps per minute
8
Q
Some ships use 200 GPM purifier , what should be BPM
A
146-150 BPM
9
Q
Oil fill cap
A
Use to add oil.
- has a dipstick in center to determine level
10
Q
Oil sight glass
A
- has a retaining ring and clear glass for viewing oil level
- white line for high oil level
- red line for low oil level
- oil reservoir holds 8-8 1/2 quarts of grade 90 gear oil.
11
Q
Worm wheel and drive assembly
A
- Connects the purifier to the motor shaft by a flexible coupling
- horizontal drive shaft is supported by 2 ball bearings ( outer and inner )
12
Q
Worm wheel is keyed to the drive shaft and engages the worm quill at the bottom of spindle assembly to provide what?
A
Provide the drive rotation to the spindle
13
Q
A smaller gear of worm wheel gear assembly is used to drive what?
A
Drive the speed counter
14
Q
How is the worm wheel and drive assembly lubricated ?
A
By splash action in the oil reservoir
15
Q
Where is the worm wheel and drive assembly located?
A
Within the frame
16
Q
Spindle assembly
A
Provides drive rotation to the bowl assembly
17
Q
Spindle assembly consists of what?
A
Consist of a shaft with an attached worm quill that meshes with the worm wheel
18
Q
Spindle assembly supported by how many bearings?
A
Upper bearings (2) Upper/lower bearings (2) Lower bearings (2)
19
Q
Bowl casing
A
Bolted at the top of the frame , and houses the rotating bowl shell assembly
20
Q
Bowl casing has a ratchet hook that what?
A
Locks the bowl in an open position for service and inspection
21
Q
Bowl casing drain line extends where ?
A
From the bottom of the bowl casing
22
Q
Bowl casing has how many bowl shell lock screws and how many bowl shell plugs?
A
2 each
23
Q
What are the bowl shell lock screws and bowl shell plugs do?
A
They help disassemble of the bowl shell assembly
24
Q
Bowl shell screws must be removed and plugs installed prior to what?
A
Prior to operation
25
How many bowl cover clamps lock the bowl cover to the casing ?
3 cover clamps
26
O rings do what
Provide a seal between the casing and bowl cover .
27
How many O rings are there ?
2
28
How many inlet and outlet connections?
2 -With flanges and connections to piping
29
The housing of the inlet and outlet connections serve as what?
They serve as a hinge pin for the bowl cover .
30
Bowl cover provides what?
It provides a sealed enclosure over the top of the bowl casing as the purifier is in operation.
31
The bowl cover covers what?
The rotating assembly
32
Hinges on the bowl casing, when in the open position , the cover is what?
Automatically locked in place by the locking hook
33
The bowl cover houses what?
The inlet and outlet lines . And are flexible
34
Feed tube assembly
It provides a passage for dirty JP5 to the top of bowl.
35
Feed tube assembly contains what?
Seal water inlet and a purified JP5 outlet
36
Feed tube assembly contains a regulating tube which does what?
It directs feed inlet to the center of the distributor.
37
Regulating tube is made of ?
Nylon, to prevent sparking
38
Feed tube assembly is bolted where ?
To the top of the cover
39
Spring loaded “T” handle assembly
It screws into paring disc and raises paring disc to complete the upper seal .
-it has left handed threads and remains down when screwed into paring disc
40
Water discharge chamber
Receives water displaced over the discharge ring .
- discharges into water outlet connection of bowl casing.
- it contains an observation port for visual check of discharges water
41
Inlet and outlet connections
They have rubber seals to prevent leakage between pipes and tubes .
42
Inlet and outlet connection seals are located where ?
Directly over the motor , and any leakage of the seal will cause a fire
43
Bowl assembly
Provides a working area for separation of contaminants from the JP5
44
The bowl assembly is driven by the what?
Driven by spindle through the worm drive assembly
45
The bowl assembly transmits motion to JP5 and provides what?
The necessary centrifugal force to cause separation to take place
46
Bowl assembly capacity ?
300 GPM at 60-90 degrees F.
47
Bowl speed of bowl assembly ?
4100 RPM
48
Bowl assembly contains what?
The water seal during operation.
49
Bowl assembly retains what?
Most of the solids and emulsions
50
Bowl assembly is held to the spindle by what?
The spindle cap nut
51
Bowl assembly has annular passages near its center to allow what?
To allow seal water to drain to the casing
52
A conical shaped strainer prevents what?
Clogging of the drain holes
53
Bowl confines the liquid being separated and contains what?
- paring disc
- disc stack
- distributor
- strainer
- spindle cap nut
54
Distributor
AKA tubular shaft.
| - forms a circular bulkhead between the feed inlet and the discharge to the paring disc .
55
The distributor has 3 unequally space raised bosses on the underside which interlock with?
3 slots in the bowl shell
56
The unequally spaces raised bosses and and 3 slots in the bowl shell allows what?
The tubular shaft to fit in one position only and rotate with the bowl shell
57
The distributor has how many holes near the outside diameter ?
12 holes
58
Intermediate discs for 300 GPM purifier / 200GPM purifier
300GPM has 186 discs
| 200GPM has 127 discs
59
Each disc has 12 holes which line up with the holes in the what?
Distributor ( tubular shaft)
60
Top disc
Covers the entire disc stack and forms a pump casing for the paring disc .
- rotates with disc stack and is wider than disc stack .
- also has no holes
61
Paring disc
Acts as a pump and discharges JP5 from bowl .
- does not rotate
- it has a protecting collar made of nylon.
- it threads onto the feed tube assembly.
62
Bowl top
Compressed and keeps the disc stack on the distributor
63
Bowl top houses what?
An upper and lower sea ring
64
Bowl top lower ring forms a what?
Forms a liquid tight seal between bowl shell and bowl top
65
Bowl top upper ring forms what?
Forms a liquid tight seal between the discharge ring and bowl top
66
Coupling ring
Locks the bowl top to the bowl shell and screws to the shell.
- it has left handed threads and am indicating arrow to show the direction of rotation for removal.
67
The bowl top and coupling ring each have marks that must be aligned for proper what?
Proper disc compression.
| This line is called the LOLLIPOPS
68
The coupling ring alignment mark must not pass the bowl top alignment mark by how many inches ?
4 1/2”
69
If the coupling ring alignment mark passes the bowl top alignment by more than 4 1/2” this indicates what?
It indicates excessive wear of the bowl threads , and this is to personnel and equipment
70
Discharge ring
It acts as a dam to maintain a proper line of separation in the bowl
71
How many discharge is the purifiers furnished with ?
7 discharge rings
72
Inside diameter of discharge ring varies from how many millimeters and millimeter increments?
220-250 millimeters at 5 millimeter increments
73
Coupling nut
Locks the discharge ring in place.
| -screws onto bowl top and has left handed threads .
74
A/C motor and controller
- motor provides the necessary torque to drive assembly
| - magnetic controller is manually operated using start and stop buttons
75
A/C motor is mounted where ?
Directly mounted to the base plate of the purifier
76
Start button on the magnetic controller causes the “hold” light to come on, indicating what?
Motor winding are energized
77
How long till the “hold” light goes out, and the “run” light to come on?
11 1/2 minutes ( +/- 1 minute)
78
Purifier must have a feed pressure and back pressure of how much psi for proper operation?
15-25 psi feed pressure
15 minimum back pressure
20psi ideal back pressure
25 psi max back pressure
79
Back pressure must not be below or above how much psi?
Not below 15 psi
| Not above 35 psi
80
Regulating tube
Made of nylon and directs fuel to the center of the tubular shaft( distributor )
81
What kind of maintenance check is done on purifiers?
R-37 check.
- 400 +/- 25 hrs.
Unscheduled check , every time we pull into ports we clean purifiers
R- means unscheduled
82
The drive housing and assembly contains what?
- spindle assembly
- direct drive assembly
- speed counter
- brake
- lubrications system
83
The purifier drive motor rotates at what RPM?
1770-1775 RPM
