Ballast Engineer

Roll Sg Pte Ltd; Batam; On-site; IDR 180,000,000 - 240,000,000; Full time

Job summary

Roll Sg Pte Ltd in Batam, Indonesia seeks an experienced Marine/ Naval Engineer to develop, verify and support ballast, stability, and load-out activities for barges and heavy transport operations.

You will review data, prepare ballast plans, perform stability analyses, and coordinate with naval architects, surveyors, and client teams to ensure safe, compliant operations and timely execution.

Qualifications

• Bachelor's degree or higher in naval architecture, marine engineering, offshore engineering, mechanical or civil/structural engineering.
• Minimum 5–10 years of relevant marine engineering experience.
• Experience preparing/studying stability calculations and ballast plans.

Responsibilities

• Gather and review barge/vessel data, hydrostatic data, stability booklets, tank plans and certificates.
• Prepare ballast and de-ballast plans for load-out, float-off, skidding, and transfer operations.
• Perform stability calculations for displacement, drafts, trim, heel/list, and GM.
• Evaluate deck loading, longitudinal and transverse strength, and local structural capacity.
• Establish operational limits, ballast sequence, pump capacity, and contingency actions.
• Review technical documents from subcontractors and coordinate with naval architects and client teams.
• Provide field engineering support during mobilization, trials, and critical operations.

Skills

Naval Architecture

Marine Engineering

Offshore Engineering

Stability Calculations

Education

Bachelor's degree or higher

Job description

To develop, verify, and support the execution of ballast, stability, and marine load-out engineering for barges, pontoons, floating structures, and heavy cargo transport operations. The position ensures that every stage of a marine operation is technically feasible, stable, structurally acceptable, and aligned with approved project procedures and operational limits.

Key responsibilities

Gather and review barge/vessel data, including general arrangement drawings, hydrostatic data, stability booklets, tank plans, tank capacities, deck-strength limitations, structural drawings, certificates, and operating restrictions.

Review cargo/module data, including weight, center of gravity, dimensions, support points, load distribution, transportation frames, grillage, sea fastening, and lifting/transfer arrangements.

Prepare ballast and de-ballast plans for load‑out, load‑in, float‑off, float‑over, skidding, SPMT transfer, lifting, towing, berth operations, and other relevant marine activities.

Perform stability calculations for all relevant operational stages, including displacement, drafts, trim, heel/list, GM, free‑surface effect, wind heeling, damaged stability where required, and operational stability margins.

Evaluate deck loading, load distribution, longitudinal strength, transverse strength, support reactions, local structural capacity, and other applicable barge/vessel limitations.

Establish critical operational limits, including target tank levels, ballast sequence, pump capacity requirements, flow rates, timing, allowable drafts, allowable trim/list, environmental criteria, hold points, and contingency actions.

Prepare or contribute to engineering calculations, technical memoranda, method statements, drawings, operation procedures, risk assessment inputs, lifting/load‑out plans, and engineering review packages.

Review engineering documents, calculations, and procedures submitted by subcontractors, vendors, clients, or other project disciplines.

Provide field engineering support during mobilization, trials, load‑out/load‑in, towing preparation, and other critical operations; compare actual readings with planned values and recommend technical actions when deviations occur.

Coordinate with Naval Architects, Marine Warranty Surveyors, classification societies, Barge Masters, Marine Superintendents, Heavy Lift Engineers, and client engineering teams.

About you

Bachelor's degree or higher in Naval Architecture, Marine Engineering, Offshore Engineering, Mechanical Engineering, Civil/Structural Engineering, or a closely related engineering discipline.

Minimum 5–10 years of relevant experience in marine engineering, naval architecture, offshore installation, barge stability, heavy lift, load‑out/load‑in, project cargo transportation, or engineered transport.

Demonstrated experience preparing or reviewing stability calculations, ballast plans, vessel suitability assessments, load‑out engineering, or marine operation procedures.

Experience supporting offshore, shipyard, port, fabrication‑yard, energy, petrochemical, renewables, or major infrastructure projects is preferred.

Meet all requirements as stated in the company competence and training matrix.