Question 63 TV02 - Towing Vessels - Great Lakes and Inland

The Correct Answer is B **Explanation for Option B (4) being correct:** When connecting flanges temporarily, especially in maritime or industrial settings for the transfer of cargo (like cargo oil), safety and pressure containment are paramount. Standard industry guidelines (often derived from or complementary to ANSI/ASME standards, and heavily enforced by classification societies and port regulations) dictate the minimum number of bolts required for temporary connections to prevent leakage and catastrophic failure. The generally accepted minimum standard for securing a standard 8-bolt flange connection temporarily (often referred to as "spudding in" or "hand-tightening") for cargo transfer operations is the use of **one bolt in every quarter of the flange** (or 90 degrees apart). This ensures adequate initial structural integrity and provides balanced compression around the gasket. Therefore, four bolts are the minimum required to safely initiate the transfer while maintaining sufficient pressure integrity to prevent spills and accidents. **Why the other options are incorrect:** * **A) 2:** Two bolts provide insufficient and unbalanced pressure on the gasket, making leakage highly probable and increasing the risk of the flange separating under pressure, leading to a serious environmental and safety hazard. This is generally deemed unsafe for pressurized cargo transfer. * **C) 6:** Six bolts (three quarters of the total) is safer than four, and often used as a standard practice for secure temporary connections. However, the question asks for the **minimum** number required. While 6 is safer, 4 is the regulatory and operational minimum threshold required to initiate the transfer safely. * **D) 8:** Eight bolts (using all available positions) represents a fully secured, standard connection. While this is the safest and required condition for permanent or long-term high-pressure connections, it is not the **minimum** required number for a temporary connection necessary to commence the transfer operation.