Part #
| Item
| Function
| Failure Mode
| Effects of Failure
| S
| Cause of Failure
| O
| Design Controls
| D
| RPN
| Recommended Actions
|
1
| Black Ball
| Grip for Pumping
| Could be Unscrewed and Lost
| Uncomfortable Pumping
|
| Unaware Users
|
| Make sure the ball is screwed on tightly
|
|
| Put some glue on threads
|
2
| Plunger
| Forces Air into Keg
| This part is very robust. Cannot foresee any failure modes.
|
|
|
|
|
|
|
|
|
3
| Plunger Disc
| Air Tight
| This part is very robust. Cannot foresee any failure modes.
|
|
|
|
|
|
|
|
|
3.1
| O-Ring
| Seal
| O-ring becomes hardened
| Loss of air tight seal for pressurizing keg
|
| Repeated use and time
|
| Oil the o-ring to keep it moist
|
|
| Sell spare parts
|
4
| Cylindrical Plunger Casing
| Supply Keg with Pressure
| Dent in the casing, burs, scratches, rust on the inside of the casing
| Plunger cannot be moved inside the case, o-ring gets torn up
|
| Misuse, Dropping the tap
|
| All these pieces are robust
|
|
| None
|
5
| Cylindrical Top
| Encloses Plunger in Casing
| Top comes unscrewed
| Cannot pressurize keg
|
| Human tampering
|
| Screwed on tightly
| cell 9
| cell 10
| None, gluing these threads makes disassembly harder
|
6
| Spring
| Prevents Plunger from Getting Stuck
| Breaks
| Plunger, though unlikely, may get stuck at top of casing
|
| Misuse or fatigue
|
| Robust spring
| cell 9
| cell 10
| Sell spare parts
|
7
| Center Cylinder
| Separates Air Input from Beer Output
| 1)Leaks beer at the connection point with hose 2)Creates turbulence in beer flow
| 1)Loss of beer 2)Foamy beer
|
| 1)Sealant on threads is old 2)Manufacturing
|
| 1)Sealant is used 2)Their Design
| cell 9
| cell 10
| 1)None 2)Look into smoother way to transition into tubing
|
7.1
| O-Ring
| Seal
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8
| Lever
| Attaches Tap and Keg
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.1
| Plastic Casing
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.2
| White Cap
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.3
| Spring
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.4
| Center Rod
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.5
| Nut
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
8.6
| Washer
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
9
| Lever Pin
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
10
| Base
| Attaches to Keg
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
10.1
| O-Ring
| Seal
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
11
| Hose
| Transfers Beer from Tap to Cup/Mouth
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12
| Nozzle
| Releases Beer from Hose
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12.1
| Handle
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12.2
| White Plastic Center
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12.3
| Spring
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12.4
| Cap Seal
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|
12.5
| Hard Plastic Cap
| cell 2
| cell 3
| cell 4
|
| cell 6
|
| cell 8
| cell 9
| cell 10
| cell 11
|