Service

Tank Cleaning Programs

Cut sludge, minimize waste, reduce out-of-service time and LPOs — for safe, faster API inspection.

Storage tanks naturally accumulate sludge heels that make servicing, inspection, and turnaround planning more difficult. Traditional mechanical cleaning through confined-space entry is slow, expensive, and carries significant safety exposure.

Indie Chem Co designs in-tank chemical treatment programs for crude tanks, product tanks, resid tanks, sour water tanks, and slop systems by evaluating tank contents, sludge characteristics, and operational constraints to determine the most effective application method. A chemical tank cleaning program to reduce tank bottoms before entry can often cut waste volumes by more than 90%. This approach also minimizes emissions, reduces vapor generation (VOCs/HAPs), shortens degassing scope and time, reduces total out-of-service duration, and lowers the equipment and personnel required to complete the job — less time, less people, less equipment, less risk, and lower waste.

How It Works

Characterize, design, apply.

  1. 01

    Tank and sludge characterization

    We gather information on tank size and configuration, current product in service, estimated sludge volume and distribution, and target cleaning objectives — capacity restoration, inspection preparation, or decommissioning preparation. Where tank heel samples are available, laboratory analysis helps build the application treatment plan and mass balance calculations.

  2. 02

    In-tank program design

    A treatment program is tailored and developed specifically to each tank's set of conditions — sludge composition, application method, temperature requirements, chemical options, and agitation requirements.

  3. 03

    Treatment application and agitation

    Chemistry is introduced into the tank and paired with mechanical agitation to ensure full contact with the sludge layer, enabling targeted objectives such as dissolution, degassing, passivation, and neutralization. The treatment breaks down and mobilizes tank bottoms so they can be pumped out or further conditioned for entry. Program duration varies based on sludge volume, tank configuration, and the specific treatment design.

Applications

Tanks and systems addressed.

  • Refinery tanks — benzene, crude, resid, and sour water
  • Crude storage tank sludge reduction and capacity restoration
  • Refined product tank cleaning (gasoline, diesel, jet fuel, fuel oil)
  • Slop tank and slop oil system cleaning
  • Tank preparation for inspection (API 653 internal inspection support)
  • Tank decommissioning and service change preparation

Benefits

What the program delivers.

Significant sludge volume reduction

In-tank chemical programs consistently achieve 50–70% or greater reductions in bottom sludge volume — directly translating to reduced waste volumes and more product recovery, while reducing degassing scope and requirements.

Reduced confined space exposure

Effective chemical pre-treatment reduces the duration and scope of manned entry for mechanical cleaning. Fewer hours in confined space is a direct safety improvement.

Cost-effective alternative to full manual cleaning

The combined cost of in-tank chemical treatment — chemistry, agitation equipment, and slop processing — is typically substantially lower than the cost of a full manual cleaning program with manned entry crews.

Technical Approach

No tank heel is the same.

Effective tank cleaning requires a disciplined technical approach because the tank heel, application method, and cleaning objectives all directly influence safety, total time, and waste outcomes. Sample analysis and treatment efficiency testing show how the heel responds to chemical solutions, while field constraints like temperature, mix energy, circulation, and available time define what can be achieved.

Paraffinic crude bottoms demand precise control of pour points, solubility windows, and cleaning temperatures, whereas heavy low-API tank heels from WCS, resid, or pitch require an entirely different treatment strategy. Solids such as cat fines, sand, iron oxides, and iron sulfides add complexity, and VOC sources like benzene (BTX), H₂S, mercaptans, and gas condensates must be addressed independently. No single method works across all conditions — each tank, configuration, and resource set creates a new engineering problem that only a technical, data-driven program can solve.

Talk to us about your tank turnaround challenge.

Share your tank configuration, product service, and cleaning objectives. We'll come back with a realistic assessment and a program that fits your schedule and constraints.

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