Inspection of chemical tanks and pipelines


Care and caution must be observed in the industrial handling and storage of chemicals and flammable liquids to prevent personal, environmental and property damage. the matter is regulated by several laws, decisions and regulations.

The manufacturer or importer must apply for construction approval for individual tanks if the tank is not manufactured in accordance with tank standards. Plan and structural inspections carried out by Insteam Oy ensure the structural compliance of the manufactured tanks with regulations. for these so-called storage tanks must be periodically inspected at certain safe intervals. Condition assessments of tanks in use can be done in cooperation between Insteam’s inspectors and the customer. In essential repair and alteration works, a statutory structural inspection is always required, which is carried out by an approved inspection body. For repairs, you usually have to apply for plan approval in advance from the inspection body.


  • safety
  • minimization of environmental risks
  • minimization of financial risks


The company must ensure the reliable operation and safe use of the chemical pipeline. There are pipeline requirements in the legislation on chemical safety and pressure equipment, and the requirements apply to the design, manufacture, placement and use of pipelines.

The pipeline orderer and the manufacturer must agree in writing on the responsibilities of pipeline delivery and the technical information to be delivered to the pipeline manufacturer. Information is needed for pipeline classification and risk assessment.

Chemical pipelines are classified based on content, pressure and diameter. The class defines the applicable conformity assessment procedure, i.e. the module. According to chemical regulations, at least a class I module must be used for the evaluation of all pipelines containing dangerous chemicals.

The manufacturer is responsible for the following:

  • piping design
  • manufacturing
  • risk assessment
  • preparation of technical documents and user manuals
  • CE marking of the pipeline
  • drawing up a declaration of conformity
  • delivery of documents to the customer in accordance with the contract.

Harmonized EN and national standards for both metallic and plastic pipelines are available for the implementation of technical details.

The inspection body assesses the conformity of the pipeline if the pipeline belongs to PED classes II-III. The inspection body also inspects the pipeline during operation at the customer’s request.

Pipeline manufacturing steps:

STEP 1 Procurement of pipeline and responsibilities

  • Define in writing the responsible manufacturer of the pipeline, the scope of delivery and the technical specification.
  • Agree on the documents to be submitted and the person performing the risk assessment.

STEP 2 Piping classification and module selection

  • Define the contents, pressure and diameter of the pipeline.
  • Classify piping based on pressure equipment regulations.
  • At least the requirement level of class I is used for all chemical pipelines.
  • Define the module used in design and manufacturing.
  • The inspection body is involved in the evaluation of modules of classes II and III

STEP 3 Planning

  • Assess pipeline risks.
  • Take special requirements into account, e.g. placement, protection, equipment and safety devices.
  • Design the pipeline to meet the requirements, use the standards.
  • Ensure the qualification of welders and methods.
  • Prepare technical documents as a basis for manufacturing.

STEP 4 Preparation, inspection and final evaluation

  • Use manufacturing methods that meet the requirements, use harmonized standards.
  • Take into account possible changes during manufacturing and installation, remember to update the documents.
  • Perform the required checks.
  • Perform a final inspection of the pipeline technical documents, a pressure test and an inspection of safety devices.
  • Mark the contents and direction of flow in the pipeline.
  • Attach the CE mark to the pipeline if the pipeline belongs to PED classes I-III based on pressure equipment legislation.
  • Prepare a Declaration of Conformity.

STEP 5 Documents and implementation

  • Compile the design and manufacturing documents into a chemical pipeline book.
  • Compile the instructions for use and supplement if necessary.
  • Prepare a periodic inspection and advance maintenance plan for the pipeline.
  • Remember staff training.

STEP 6 Operation and maintenance of the pipeline

  • Use and maintain in accordance with instructions and plans.
  • Carry out the necessary repairs and modifications in compliance with pressure equipment regulations.
  • Attach the documents to the chemical pipeline book, remember the declaration of conformity.