Tankerman (PIC) Exam Prep

USCG MMC Tankerman PIC — Dangerous Liquids & Liquefied Gases Guide

The Tankerman Person-in-Charge (PIC) endorsement certifies that a mariner is qualified to supervise cargo transfers on U.S. tank vessels carrying Dangerous Liquids (DL) such as petroleum and chemicals, or Liquefied Gases (LG) such as LNG, LPG, and anhydrous ammonia. Governed by 46 CFR Part 13 and aligned with STCW Regulation V/1-1 (oil and chemical tanker) and V/1-2 (liquefied gas tanker), Tankerman PIC is the credential that lets you sign the Declaration of Inspection (DOI), run the transfer, and be legally accountable for a loading or discharging operation at a dock, single-point mooring (SPM), or ship-to-ship (STS) rendezvous.

Candidates are typically ABs, mates, and officers on product tankers, chemical carriers, LNG/LPG ships, OSVs that transfer bulk fuel, or articulated tug-barge (ATB) units operating on the Mississippi, Hudson, Houston Ship Channel, and Delaware River. With 2,471 core questions in the combined Q145 Deck General and Q300 Deck Safety pools applicable to tankermen, this is one of the largest and most technical MMC rating exams — and it demands the most disciplined preparation of any deck endorsement short of a full Mate's license. Hiring companies like Crowley, OSG, Kirby, Harvey Gulf, and Kinder Morgan prioritize PIC-qualified mariners, and the wage differential over a non-PIC AB is typically $50–$120 per day.

Exam structure

Tankerman PIC exams are *assembled* from two USCG question banks, drawn and weighted according to the sub-endorsement you seek:

• Q145 Deck General (Cargo) — cargo calculations, inerting, tank cleaning, cargo piping, Coriolis and PD meters, line-up and blinding procedures, ullage and outage, API gravity corrections
• Q300 Deck Safety — firefighting on tankers, gas detection, rescue from enclosed space, personal protective equipment, spill response, toxic exposure limits

Sub-endorsements each have a distinct exam set per the NMC blueprint:

• PIC-DL Barge: 70 questions, 3 hours, 70% pass
• PIC-DL Tankship: 120 questions across two modules, 4.5 hours, 70% pass per module
• PIC-LG Barge: 70 questions plus a supplemental LG-specific module
• PIC-LG Tankship: 150 questions across three modules — most complex exam

Rules of the Road is not tested for the Tankerman endorsement itself, but candidates upgrading to Mate or Master on tank vessels must still pass Rules at 90% on that higher exam, so MMCE.app displays the 90% threshold on your Tankerman track to build the habit early.

Eligibility & prerequisites

• Sea service: for PIC-DL, 90 days on a tank vessel carrying the product class, with at least 10 documented transfer operations; for PIC-LG, 90 days plus 10 LG-specific transfers (per 46 CFR 13.201 and 13.401), logged and signed by the master or chief officer
• Training: USCG-approved Tankerman PIC course covering specific gravity, flash-point, inhibition, reactivity, cargo heating, compatibility matrices — fulfilling STCW A-V/1-1 or A-V/1-2
• Medical: current CG-719K
• TWIC: required
• Age: 18+
• Endorsement stacking: you must already hold a Tankerman Assistant rating (or be applying concurrently), which is itself built on 30 days of tank-vessel sea service

Submit CG-719B with CG-719S sea-service letters showing product types (crude, clean products, caustic, benzene, butadiene, LNG, LPG, anhydrous ammonia, ethylene) and the Letter of Designation from each vessel's master attesting that you participated in the transfer operations under supervision. Expect the NMC to request additional documentation for exotic chemical cargoes like vinyl chloride monomer (VCM) or MTBE.

Study timeline

Budget 10–14 weeks of preparation. The question pool is four to ten times larger than most MMC exams, and the material spans chemistry, thermodynamics, regulations, and operations.

• Weeks 1–3: cargo chemistry — flash-points, flammable range, reactivity and inhibition, vapor pressure (Reid vs true), specific gravity (API and IMO scales)
• Weeks 4–6: cargo systems — piping, valves (gate, globe, ball, butterfly), deep-well and submerged pumps, heat exchangers, IG (inert gas) systems, nitrogen padding
• Weeks 7–8: operations — line-up, transfer rate calculations, topping off, stripping, crude-oil washing (COW), gas-freeing, purging, freeing for hot work
• Weeks 9–10: emergencies — spill containment, enclosed-space rescue, BLEVE, rollover in LNG tanks, jettisoning, emergency shutdown (ESD)
• Weeks 11–12: regulatory — 33 CFR 155/156, 46 CFR 35, OCIMF ISGOTT, SIGTTO, IMDG compatibility rules
• Weeks 13–14: full-length mock exams plus remediation on weak-area dashboard

What examiners look for

USCG tankerman items are scenario-heavy: "A barge is loading No. 6 fuel at 2,400 bbl/hr into a tank with 4,200 bbl ullage remaining; at what rate will you initiate topping-off?" Expect numeric precision, exact percentage vapor space, and CFR citations embedded in the stem. Download the NMC sample-exam PDFs labeled *Q145 Illustrations* and *Tankerman Sample Exam* from nmc.uscg.mil/examinations. The liquefied-gas items pull heavily from the IGC Code and SIGTTO publications and use compressibility factor Z in calculation items — do not skip thermodynamics if you are pursuing LG. Expect several questions per exam on the Declaration of Inspection and the PIC's personal liability if the transfer deviates from the approved transfer procedures manual.

Common pitfalls

• Treating inerting oxygen threshold as 8% generically (it is 8% by volume or less for most oil cargoes, but 5% or less for chemical tankers carrying reactive products)
• Confusing flammable range for gasoline (1.4%–7.6%) with that of methane (5%–15%) or hydrogen (4%–75%)
• Miscalculating API gravity corrections without consulting ASTM Table 54B for temperature compensation
• Skipping the Declaration of Inspection checklist — tested verbatim from 33 CFR 156.150
• Underestimating enclosed-space rescue questions, which appear on both Q145 and Q300 modules
• Missing the compatibility matrix between reactive chemicals (never carry acid above or adjacent to caustic)
• Forgetting that Rules at 90% is not tested here, so candidates often lose it later on the Mate exam because they deprioritized it during Tankerman prep

Study strategy using MMCE.app

1. Set the deck-gen and deck-safe modules in your track; the engine will draw from the 2,471 core tankerman items.
2. Start with an IRT-calibrated diagnostic across both modules — theta-per-module tracking exposes whether chemistry or regulations need more work and updates after every session.
3. Use the AI Tutor on every missed cargo-calc question — Claude can regenerate the calculation with different numbers so you internalize the method, not the answer.
4. Build SM-2 flashcard decks for: flash points (JP-5, No. 2 diesel, crude, benzene, toluene), toxic exposure limits (TLV-TWA, IDLH), vapor densities, and CFR-part-number pairs.
5. Run timed mock exams weekly in the final four weeks, matching the 4.5-hour tankship format so your stamina holds for the full sitting.
6. Use the weak-area dashboard to drive your final review week — MMCE.app will tell you exactly which topic cluster you cannot leave unaddressed.

Relevant publications

• 46 CFR Part 13 — Tankerman certification
• 46 CFR Subchapter D (Parts 30–40) — tank vessels, construction and operation
• 33 CFR Parts 154, 155, 156, 157, 158 — shoreside and afloat transfer operations, oil pollution prevention
• IMO IBC Code and IGC Code — chemical and gas carrier construction and operations
• ISGOTT 6th edition (ICS/OCIMF) — definitive operational guidance
• **SIGTTO *Liquefied Gas Handling Principles***
• Marine Safety Manual, Volume II and VI (USCG)
• API MPMS (Manual of Petroleum Measurement Standards) — custody transfer calculations
• NVIC 15-14 — Tankerman PIC training guidance
• NVIC 01-14 — STCW tanker officer training

After you pass

Tankerman PIC renews with the MMC every 5 years. Under STCW, you must complete an approved refresher for *Advanced Oil Tanker*, *Advanced Chemical Tanker*, or *Advanced Liquefied Gas Tanker* every 5 years if you have not sailed in that capacity for 1 year of the preceding 5. Typical upgrade paths are Chief Mate and Master of Tank Vessels (adds advanced stability and cargo calculation modules, plus COC oral boards), and cross-endorsement between DL and LG if sea service supports it. Keep a meticulous cargo log — the NMC audits PIC designations frequently, and sea-service disputes are the most common reason tankerman upgrades stall for weeks. Consider adding Vessel Personnel with Designated Security Duties (VPDSD) and Advanced Fire Fighting to round out your blue-water resume. Many PIC-qualified mariners also pursue Gas-Free Engineer certification through ABYC or an OCIMF-aligned private provider, which pairs naturally with the PIC skill set and opens shore-based hot-work permit roles at refineries and petrochemical terminals.

Career outlook

Demand for PIC-qualified mariners has been structurally high since the U.S. shale-oil boom expanded Gulf Coast product exports, and the LNG buildout at Sabine Pass, Corpus Christi, Cameron, Cove Point, and Calcasieu Pass has created a persistent shortage of PIC-LG holders. Day rates for tankship PICs run $500–$900 at sea, with LNG officers commanding the top end; ATB barge PICs on the inland system typically earn $350–$500 per day. Shoreside, former PICs move into port captain, vetting, SIRE inspector, and facility loading-master roles with an additional pay bump. The endorsement pays for itself within a single hitch for most mariners. MMCE.app tracks career-oriented content alongside exam prep so you can see how each stacking endorsement (PIC-DL → PIC-LG → Chief Mate Tank) changes your earning potential.