Blueprint Reading & Interpretation Flashcards
7 cards from real DPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Blueprint Reading & Interpretation flashcards as text
On a DP consequence analysis diagram, a 'worst-case failure design intent' (WCFDI) notation identifies:
Answer: The single failure that would cause the greatest loss of position-keeping ability
WCFDI analysis defines the single worst-case failure and confirms that DP equipment class requirements are still met after that failure occurs.
When a DP blueprint uses the notation 'SIL 2' next to a safety function block, it means:
Answer: The safety function meets Safety Integrity Level 2 requirements for reliability
SIL (Safety Integrity Level) 2 indicates the safety function has a defined probability of failure on demand, per IEC 61508/61511 standards.
A DP cabling blueprint shows cable routing through a designated 'A-60 fire zone boundary.' This notation requires the operator to:
Answer: Ensure cables pass through approved fire-rated penetration fittings
A-60 fire zone boundaries require all penetrations, including cables, to use certified fire-stopping fittings to maintain hull integrity.
In a DP thruster vector diagram included in vessel blueprints, arrows of different lengths represent:
Answer: The relative thrust force magnitude and direction each thruster can produce
Vector arrow length corresponds to thrust magnitude and the arrow direction shows the thrust output direction, illustrating the vessel's force envelope.
On a DP electrical single-line diagram, a rectangle with a diagonal line inside represents:
Answer: A fuse or fusible disconnect
A rectangle with a diagonal line is the standard IEC/ANSI symbol for a fuse, indicating a sacrificial overcurrent protection element.
A DP blueprint cross-reference table lists document number 'EL-DP-003-R2'. The prefix 'EL' most likely indicates:
Answer: Electrical system drawing discipline
Document numbering conventions on vessel blueprints use discipline prefixes; 'EL' universally designates the Electrical discipline.
When interpreting a DP blueprint that shows two separate cable routes between the same DP computer and a thruster, the design intent is to:
Answer: Provide a redundant communication path in case one route is damaged
Dual routed cables provide physical redundancy so that a single cable fire or damage event does not sever the connection to the thruster.