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The work execution plan is a working design according to which all installation of process equipment is directly carried out.
The work execution plan, based on the POS, sets out the plan of work at a specific construction or installation site. It is precisely this document that governs the carrying out of the installation.
The PPR must comply with all building codes and standards. It includes a calculation-and-description part and a package of diagrams and drawings. The document may be developed for a separate segment of work (construction of a workshop, warehouse, car park), for the whole facility, or for individual, especially critical and complex operations.
All the requirements for organising the installation are set out in detail in the explanatory note. In addition, lists of rigging and installation equipment and fixtures, requirements for materials, metal structures and pipelines are compiled, and the planned volumes of work are calculated. On the basis of the calculations, the need for energy resources is determined.
The work execution plan includes:
- Process and enlarged drawings for the assembly of equipment and units;
- Layouts for installing tooling, lifting mechanisms and scaffolding;
- Instructions on possible slinging schemes;
- The availability of standardised solutions for installation;
- A connection diagram for temporary power supply, including electricity, steam, water and gases;
- The assembly methods used, the need for and types of welding works;
- The calendar and schedules for carrying out the work.
An important place in the PPR is occupied by measures to ensure safety, occupational health and fire safety.
The work execution plan makes it possible to determine the expediency of using machinery or workers at a given stage, specifies the scope of work, and identifies the technologies most suitable for specific operations.The approval of the document must be confirmed by all parties involved in the construction, including the installation organisation if equipment installation is planned.
PPR for pipeline installation
Work execution plans (PPR) for the installation of pipelines at industrial enterprises are developed as part of the PPR for the installation of process equipment in accordance with OST 36-143-88 “Installation of process equipment and process pipelines. Work execution plan. Procedure for development, composition and content”.
A special case of the PPR for process-equipment installation, according to the standards, is the work execution plan for carrying out pipeline installation.
In addition to the general design, for pipelines the PPR must contain a description of the connections to the route, the materials of manufacture and the working media.
Even before installation, individual lines are mounted on the equipment, and part of the pipelines is made in blocks.In addition to the pipeline diagrams, a plan of the in-shop distribution must be provided. Pipeline installation must be carried out in stages, alternating with the services of related organisations performing thermal-insulation, electrical-installation and chemical-protection works.
The PPR includes recommendations on the methods of welding and joining pipeline sections, requirements for the degree of readiness of the openings for their installation, and methods of weld inspection.
The PPR must provide for:
the sequence of pipeline installation that ensures the creation of a work front for related organisations (for thermal-insulation, chemical-protection, electrical-installation and other works), as well as the phased handover of individual lines, sections and workshops whose installation has been completed;
the flow of installation works with uniform employment of workers and the main installation mechanisms;
safe conditions for carrying out installation works, the provision of the necessary sanitary and welfare conditions and fire safety;
measures to ensure the high quality of installation works.
The purpose of developing the PPR
The purpose of developing the PPR is to choose the most effective technological solutions in construction production, as well as to apply modern means of mechanisation that help improve the quality of the construction product while reducing the time and cost of construction.
The PPR is aimed at carrying out construction and installation works (SMR) within the set timeframe while ensuring occupational health, environmental and fire safety, through the development of appropriate measures and the fulfilment of the requirements of technical regulations in construction.
The PPR establishes the conditions for fulfilling, during construction, the requirements of legislation on occupational health, the environment and the population, as well as the possibility of carrying out all types of control necessary to assess the conformity of the work performed with the requirements of the design and regulatory documentation and/or the terms of the contract.
The development of the PPR is the responsibility of the organisation carrying out the construction.
The PPR must be developed by:
- − The Developer (Client) when combining the functions of Client and Contractor.
- − The General Contractor under the contract method of construction;
- − The Contractor (Subcontractor) performing individual or specialised types of work.
As a rule, the PPR for the entire construction facility is developed by the General Contractor, while the PPR for individual types of general-construction, installation and special construction works is developed by the organisations performing these works.
The PPR is approved by the organisation carrying out the construction. As a rule, the PPR is approved by the head or chief engineer of the general contracting construction organisation.
For individual types of construction-installation and special construction works, separate PPRs may be developed, which are approved by the heads of the relevant contracting construction organisations and agreed with the General Contractor.
A PPR on the territory of an operating enterprise is agreed with the organisation operating it.The approved PPR is handed over to the construction site 2 months before the start of the planned construction and installation works.
The company “Sintez TMK” develops PPRs for the following types of work:– Work execution plan (PPR) for the preparatory construction period;
– Work execution plan (PPR) for loading and unloading works;
– Work execution plan (PPR) for the dismantling of various structures;
– Work execution plan (PPR) for the installation of precast reinforced-concrete structures;
– Work execution plan (PPR) for the installation of metal structures;
– Work execution plan (PPR) for the installation of internal utility communications and equipment;
– Work execution plan (PPR) for electrical-installation works;
– Work execution plan (PPR) for laying utility communications by the open method;
– Work execution plan (PPR) for laying utility communications by the trenchless method;
– Work execution plan (PPR) for laying above-ground utility communications;
– Work execution plan (PPR) for the installation of process equipment;
– Work execution plan (PPRk) for loading and unloading works using lifting cranes;
The regulatory document containing the provisions, methodology and recommendations for drawing up the Work Execution Plan (PPR):
Methodological documentation MDS 12-46.2008 “Methodological recommendations for developing and preparing a construction organisation plan, a demolition (dismantling) works organisation plan, and a work execution plan”
Code of practice. Construction organisation. SP 48.13330.2011 Updated edition of SNiP 12-01-20
Moscow Government Decree No. 299-PP of 19 May 2015 “On approval of the rules for carrying out earthworks, installing temporary fences, and placing temporary objects in the city of Moscow”