Plate exchangers and air coolers
Alternative heat-transfer packages and replacement plates, gaskets or bundles.
Plate heat exchangers transfer heat through formed plates separating fluid streams. Air coolers reject heat to ambient air through a finned-tube arrangement. The two technologies suit different utility availability and operating conditions.
Typical applications
Process cooling, heat recovery and utility duties use these systems. Ambient temperature or the available cooling stream affects the achievable performance.
Types and configuration choices
Gasketed or welded plate construction and different fan arrangements offer distinct maintenance and containment features. Compare thermal cases, materials, pressure limits and installation space.
Which cooling arrangement is actually being requested?
Begin the enquiry with the available cooling resource and the approved process objective. A plate exchanger connects two specified fluid streams; an air cooler transfers heat to the air around its heat-transfer assembly. They are not interchangeable purchases merely because both are described as coolers. If the project is comparing technologies, label the enquiry as an options review and give each bidder the same process basis. Ask the reviewer to identify what utility, electrical and installation changes belong to each option before comparing purchase prices.
Keep a preliminary selection separate from a replacement order. A new package may permit changes to the arrangement, while an installed unit usually has retained connections and support constraints. State whether the responsible engineer allows alternatives and which interfaces must remain fixed. Use a short boundary list to distinguish equipment supply from layout engineering, piping changes, electrical work and site installation. Oillinko can coordinate the enquiry for manual review, but catalogue coverage alone does not confirm availability or the suitability of a proposed design.
What makes plate and gasket replacements traceable?
For a plate exchanger, ask the proposal to identify the plate design, material, channel arrangement and applicable sealing system against the installed records. A gasketed construction, a welded arrangement and a brazed unit have different replacement boundaries. State the required spare quantity and whether it means individual components or an assembled pack. Provide existing part references and the purpose of the work without instructing a bidder to infer compatibility from a photograph alone. Any proposed substitute should be listed as a technical deviation for review.
Connect the delivery documents to the actual supplied components. Request the agreed material identification and inspection records, the applicable configuration drawing and the instructions needed by the qualified service team. If an existing pack has been modified, provide the latest verified arrangement rather than an obsolete original bill of materials. Do not prescribe a tightening dimension, cleaning chemical or assembly sequence from a generic enquiry guide. Such instructions depend on the actual equipment and the approved maintenance procedure.
Which air-cooler auxiliaries and acceptance records belong in the offer?
An air-cooler package may contain more than its heat-transfer bundle. Ask the bidder to identify the proposed fan and drive arrangement, electrical inputs, controls and access provisions. Where the project requires cold-weather accessories or special handling of discharged air, state the requirement and request a defined scope rather than assuming these features are standard. Record site noise constraints and the conditions under which any quoted noise or power figure applies. Keep those figures attached to the offered configuration and operating case.
Agree what the supplier will demonstrate before shipment and which checks remain part of installation or commissioning. Tie the approved drawing, inspection schedule and final records to the equipment tag. Record deviations from the process case, hydraulic allowance or interface drawing before commercial acceptance. For a bundle replacement, identify whether retained fans, structure and controls are part of the assessment or outside the order. A successful component test does not by itself demonstrate performance of the complete installed cooling system. Use the related exchanger and maintenance guides to define connected work without merging their separate responsibilities.
Thermal duty
Identify the process heat load together with the inlet and required outlet conditions used to establish it. For a plate exchanger, provide the paired flow and temperature data for both streams and the allowable pressure loss on each side. For an air cooler, include the approved inlet-air design condition with the process case. Separate normal, peak and minimum cases, and ask the bidder to show which cases the proposed unit covers. A heat-duty number alone does not establish the available cooling conditions or the required equipment arrangement.
Fluids and design conditions
Provide composition, phase and relevant properties for each process stream, identifying uncertainty, solids and known fouling concerns. Distinguish operating pressures and temperatures from the project design limits. Request the material and sealing schedule for the offered construction rather than assuming one metal grade defines the whole assembly. For plate units, include the proposed gasket compound where applicable. For air coolers, distinguish process-side materials from fins and external protection. Keep suitability decisions subject to the actual service and responsible technical review.
Space limits
Supply a dimensioned layout showing connections, supports, access routes and the equipment removal boundary. A plate exchanger enquiry should allow the bidder to state the space required for opening the frame and handling plates, where that construction applies. An air cooler enquiry should identify the available arrangement and surrounding obstructions for review of air access and discharge. Ask for maintenance and lifting clearances on the offered drawing. A unit fitting the available footprint does not establish that its service space or installation interfaces are acceptable.
Existing model for replacements
Send the complete equipment reference, serial number, nameplate photograph and available drawing revision. State exactly what is being replaced: a whole exchanger, a plate pack, individual plates and gaskets, an air-cooler bundle or a fan-related component. Identify which parts remain in service and who verifies their condition and compatibility. Require an exact replacement or a clearly identified alternative against the retained interfaces. Matching overall dimensions, plate count or nominal fan diameter alone is not sufficient evidence of interchangeability.
How related requirements differ
Pressure vessels and separators: Pressure vessels contain fluids under specified design conditions. Separators use a vessel and selected internals to divide phases or remove entrained material, combining pressure containment with a defined process duty. Capacity, orientation, internals, materials and corrosion allowance vary by duty. The specified design code, inspection scope and nozzle interfaces belong in the equipment specification.
Storage tanks and tank accessories: Storage tanks hold liquids or other specified products within a defined storage design. Roofs, vents, level measurement and access fittings support operation and maintenance, but their configuration depends on the stored medium and tank arrangement. Atmospheric and specified-pressure tanks require different design bases. Roof type, materials, foundations, venting and accessory interfaces should be identified before comparing proposals.
Shell-and-tube heat exchangers: Shell-and-tube heat exchangers transfer heat between fluids separated by tube walls. The shell, tube bundle and channel arrangements manage pressure containment, heat-transfer area and access for maintenance. Tube material, bundle arrangement, allowable pressure drop and fouling conditions influence selection. Replacement bundles require the existing mechanical drawings and dimensional interfaces.
Compare the complete supply scope
Compare the quoted equipment boundary line by line. For a plate unit, identify the frame, plates, seals, connections, insulation and any separately priced spares. For an air cooler, identify bundles, fans, drives, supports, guards, access provisions and control interfaces. Record inspection, documentation and site attendance as included or excluded. Ask for manufacturing origin separately from the dispatch location and named delivery place. A replacement-only price should not be compared directly with a complete package quotation that includes new supports, controls and installation work.
Questions before requesting a quotation
What information should be available first? Start with the intended application and the current technical specification for plate exchangers and air coolers. In this category, the initial review includes thermal duty, fluids and design conditions, space limits, existing model for replacements. Attach the relevant drawings or scope documents and identify any information still awaiting confirmation. This makes it possible to distinguish a preliminary enquiry from a fully defined purchasing or service requirement.
Can an alternative be accepted on size or price alone? A proposed alternative needs review against the required function, materials, interfaces and documented performance. Similar dimensions or a familiar brand name do not establish compatibility. State which requirements are mandatory and where an equivalent may be considered. Availability, lead time and supporting documents are confirmed for the actual offer rather than assumed from this catalogue.