Installation method statement for Plate Heat Exchanger
Unless otherwise specified, all heat exchanger installation shall be in accordance to approved shop drawings and contract specifications. Drawing plans, schematics, and diagrams indicate general location and arrangement of Plate Heat Exchanger’s. Install Plate Heat Exchanger’s as indicated unless deviations to layout are approved on coordination drawings.
Plate Heat Exchanger shall be installed on the concrete foundation (by main civil contractor) as per approved foundation drawings, ensure adequate space is available for valves, piping and for future maintenance. It is important that enough space around the plate heat exchanger is kept free for servicing of the unit for renewal of plates, tightening of package.
Free space around the heat exchanger unit should be 1.5 to 2 times of the width. Examine areas and conditions with requirements for installation tolerances and other conditions affecting performance, operation and maintenance of Plate heat Exchanger.
Check the Heat Exchanger concrete foundation should be horizontal & smooth finishes from top. Check painting if required in civil detail. The plate heat exchanger should be mounted in an upright position (top on the nameplate is up) to avoid trapping air or other gases.
Lifting & Placement of Plate Heat Exchanger
Shift plate heat exchanger from store to the area of installation as per manufacturer’s instruction. Plate Heat exchanger should not be lift by connections or the stud around them. Strap should be used when lifting, place e strap according to the manufacturer’s instruction.
After putting down on the foundation the Plate Heat Exchanger should be leveled and align on the foundation. After alignment put rubber pad between the foundation & Plate Heat Exchanger. Upon satisfactory positioning of Heat Exchanger’s, it should be covered with polythene sheet to secure & protect it from moisture and dust ingress until such time as the units are available for commissioning.
Heat Exchanger Piping Connections
If the connection is rubber lined, the liner will act as the flange gasket. Bolt the connecting flange directly to the end plate using the drilled and tapped holes provided. Tighten the bolts evenly,do not over tighten as this could strip the threads cut into the frame plate. If loose backing flanges are fitted to the heat exchanger a suitable gasket is required to seal the flange.
The heat exchanger is usually connected for counter-current flow. The heat exchanger inter-connecting piping and piping supports should be designed such that loads and stresses on the exchanger connections are eliminated. Thermal expansion must be taken into consideration when designing the piping system. By-pass piping and valves should be considered to allow isolation of each side of the heat exchanger for inspection, cleaning, repairs, and replacement.
Install flexible connections onto the follower to prevent vibrations onto the heat exchanger and also the expansion of the pipework, caused by temperature influence onto the Heat Exchanger. Drain piping should be designed to assure complete draining. Avoid common drain manifolds. The venting system design should take into account all applicable operator and environmental safety requirements.
Install relief valves on Heat exchanger heated fluid connection. Install shut off valves at Heat exchanger inlet and outlet connections. Remove all plugs, shipping covers, desiccant containers, and other protection immediately prior to connecting unit. Avoid unnecessary exposure of internals to contaminants and moisture.
The pipe works /piping system shall be thoroughly cleaned and flushed before connecting into the heat exchanger. After completing system installation,including outlet fitting and devices, inspect exposed finish, remove burrs, dirt and construction debris and repair damaged finishes.
Plate Heat Exchanger Inspection and Testing
In process works shall be monitored for quality of workmanship and installation against approved construction drawing by the relevant Supervisor, Project Mechanical Engineer,Construction Manager and QA/QC Engineer. Ensure that the installation of Plate Heat Exchanger complies with the specification requirements and notify the main contractor I consultant in advance at least 24 hours before installation inspection must be made. Ensure a factory authorized service representative to inspect, test and adjust field assembled components and equipment installation, including connections, and to assist in field testing of plate heat exchangers.