The manufacturing and installation of penstocks, bifurcations, and expansion joints cover critical hydromechanical systems that ensure the safe and controlled delivery of water to turbines in hydroelectric power plants. This equipment, operating under high pressure, is designed through engineering calculations in accordance with project flow rates, internal pressure values, and facility geometry, and is manufactured using high-strength steel materials.
Bifurcations provide turbine feeds from the main penstock line, while expansion joints reduce stresses on the system by absorbing expansions caused by pressure and temperature. During the field installation stage, welding, alignment, anchoring, and sealing controls are meticulously performed to ensure the long-lived, safe, and efficient operation of the system. Offering solutions to the industry's expectations in its production facilities in Adana, Enermak Steel Energy Machinery and Engineering stands out with its manufacturing of penstocks, bifurcations, and expansion joints, and its field installation services.
What is a Penstock?
Penstock systems are critical infrastructure elements in dam and hydroelectric power plant (HEPP) facilities that ensure the safe and controlled transmission of water from the reservoir under high pressure.
Design Criteria and Usage Purposes: Penstocks used in energy production, drinking water supply, and irrigation projects are specifically designed, manufactured, and installed in the field by taking into account project flow rates, pressure values, topographical conditions, and operational scenarios.
Application Types and System Integrity: Penstocks can be used on supports in open terrain, on vertical or inclined lines, or as steel lining within tunnels. Depending on the type of use, they are handled as a system integrity together with straight pipes, elbows, bifurcations (branch pipes), reductions (elements used to join two pipes of different diameters), expansion joints, and similar auxiliary equipment.
Manufacturing Scope and Engineering Approach: Therefore, penstock manufacturing covers not only pipe production but also the preparation of all components of the system in accordance with engineering calculations.
How is the Manufacturing of Penstocks and Accessories Carried out?
Penstock manufacturing begins with the rolling of high-strength steel plates into cylinders in accordance with approved projects and calculations. Straight pipe sections and special parts such as bifurcations, elbows, and transitions are joined using specified welding methods by opening suitable welding bevels for longitudinal and circumferential weld joints. During the manufacturing process, reinforcement rings and structural details that will provide the necessary resistance against internal pressure, axial forces, and thermal expansions are carefully applied.
Expansion joints and flexible connections are specially designed and manufactured to accommodate temperature changes, settlement differences, and axial movements that may occur in the pipeline. In bifurcation manufacturing, reinforced connection details are executed by taking into account the main line pressure and flow characteristics.
What are the Main Components in Penstock Systems?
A penstock system generally consists of the following main parts: straight pipe segments, elbows and reductions, transition pieces, bifurcations, fixed and sliding supports, expansion and flexible joints, surge tanks and chambers, manholes and control covers, ventilation and discharge pipes and valves, reinforcement rings and injection holes, test covers and domes, and maintenance and operation platforms.
All of these components are evaluated as a whole to ensure the safe and long-lasting operation of the system.
How are Material and Welding Quality Controls Performed?
All steel materials to be used in penstock manufacturing are supplied with factory warranty documents and certificates. Chemical and mechanical controls performed through material certificates verify that the steel meets the relevant standards. No material without a certificate or test report is accepted into production.
Steel plates with a thickness of 20 mm and above are subjected to lamination tests prior to purchase. After manufacturing, radiographic (X-Ray or Gamma-Ray) examinations of welded joints are performed at specified rates. Ultrasonic testing (UT) is applied in areas where radiographic examination cannot be performed. All destructive and non-destructive testing results are reported and submitted for approval.
How are Surface Preparation, Painting, and Field Installation Processes Managed?
The internal and external surfaces of penstocks and accessories, whose welding controls are completed, are mechanically cleaned in accordance with specifications and standards. Primer and topcoat paint applications are carried out to provide long-term protection against corrosion. Pipe ends to be welded during field installation and contact areas of fixed and sliding supports are shipped unpainted.
During the installation phase, pipe segments are placed in accordance with the elevations and axes specified in the project, support adjustments are made, and field welds are completed. After installation, necessary controls, tests, and final painting processes are performed, and the penstock system is delivered ready for operation.
How are the Prices of Penstocks, Bifurcations, and Expansion Joints Determined?
The prices of penstocks, bifurcations, and expansion joints are determined depending on the pipe diameter and wall thickness, operating pressure, the quality of steel used, welding and manufacturing methods, the corrosion protection system to be applied, and the scope of installation. In addition, project flow rate, line length, number of bifurcations, expansion movements, field conditions, and the engineering standards to be applied directly affect the cost. Therefore, pricing is finalized as a result of engineering evaluations made specifically for the technical requirements of each project.
Enermak’s Expertise in Penstocks, Bifurcations, and Expansion Joints
Enermak offers penstock, bifurcation, and expansion joint solutions used in hydroelectric power plant and dam projects with a design based on engineering calculations, high-strength manufacturing, and a field-specific installation approach. These systems, produced by considering high pressure and demanding operating conditions, are designed and implemented to provide safe water transmission, long service life, and operational continuity.
