Xinwuxin integrated centrifugal chillers · Surge, oil and site scope

Select duty against a complete centrifugal operating map

For YDLSRTBMS500.1 the original table lists 1758 kW cooling, 301 kW input and COP 5.8, alongside 302 m³/h chilled-water and 354 m³/h cooling-water flow. The page does not specify the corresponding entering/leaving temperatures or heat-rejection condition. These supplier numbers are a conditional enquiry reference, not a commissioned site rating.

Issue the actual load profile, fluid temperatures, flow limits and site heat sink. Request a selected compressor/plant performance map including minimum stable load and the limits at changing heat-rejection conditions. The source’s model sizes and nominal refrigeration tons remain together on this family page; a larger table row does not establish that one quoted package meets every project duty.

Understand guide-vane and diffuser control without assuming immunity

The supplier describes a movable diffuser coordinated with inlet-guide-vane opening to regulate discharge passages, and claims continuous operation over 10–100% without surge. No independently reviewed map or test demonstrates that range at every pressure ratio, fluid condition or transient. Ask for the actual compressor’s permitted envelope and the controls used to stay within it.

Agree startup, unloading, minimum-flow/load behaviour and protective responses when heat rejection or process demand changes. Require the supplier to distinguish normal regulating actions from a protective stop. The page does not prescribe a universal surge setpoint or controller tuning; those must be issued for the selected machine by the responsible supplier/OEM.

Close oil-supported shutdown and restart

The body describes a backup oil cylinder for every centrifugal compressor and an oil-return method intended to support a stop when the oil pump fails or power is lost. Treat that as a specific protective-system claim to verify, rather than a promise that all unforeseen events can occur safely without further design.

Request the oil circuit, lubrication monitoring, backup-supply boundary, shutdown sequence and test evidence for the actual compressor. Agree how pump fault, supply loss and restart permission are handled. The website’s ‘theoretical unlimited’ bearing-life wording is not a service-life guarantee and is not used to assign replacement or inspection intervals. Obtain the actual written maintenance and overhaul schedule.

Define the low-voltage electrical and acoustic package

The description says the low-voltage series includes an onboard soft starter with motor cable connection, phase sequence and overcurrent/temperature/voltage protection. It does not identify one universal supply voltage, starting current or cabinet ingress rating for all YDLSRTBMS rows. Have the quotation issue the exact supply, complete load list, starting behaviour and site electrical interfaces.

The supplier attributes 4–7 dB(A) reduction to refrigerant injection at the compressor discharge and quotes motor efficiency up to 96%. No reviewed comparator, acoustic method or selected motor test establishes those as complete-package results. Require the actual sound-report and electrical-input boundary when those affect the purchase; do not compare isolated component figures with a competitor’s entire plant.

Approve the integrated geometry before civil work

The source table gives an overall shared 12000 × 2400 × 7560 mm size cell, while the separate labelled drawing breaks the assembly into several dimensions. Some mass rows change unexpectedly between adjacent larger model codes. No attempt is made to repair those figures by intuition. The supplier itself asks for civil drawings before construction and a project-specific design confirmation.

Obtain a corrected general arrangement, transport/module splits, lifting plan, dry/filled masses, foundation reactions and service-removal access. Close the heat-rejection enclosure, pumps, water treatment, connecting piping and control/commissioning responsibility. The illustration does not establish that every component is included or that one transport container contains the assembled system.

Request evidence for the actual selected machine

Compare quotations against the same cooling/heat-rejection conditions, minimum-load requirement, complete electrical boundary and installed scope. Ask which compressor and pressure-equipment manufacturers supply the order and which current documents accompany each assembly. Enterprise recognition and a general business licence do not certify centrifugal performance or pressure-equipment manufacture.

Current price, lead time, independently measured efficiency and purchaser-side acceptance results were not established. The platform wrote this dossier from the actual centrifugal description and original schedules; it has not operated the machine. The result is an enquiry that tests the distinctive operating and installation responsibilities of this construction rather than a generic industrial-chiller description.

1. Issue load and heat-sink conditions

   Request a selected performance/operating map including the minimum-load and transient envelope.

2. Approve mechanical and electrical scope

   Identify compressor, lubrication protections, starter, pressure boundaries and integrated assemblies.

3. Close documents and tests

   Use corrected GA/load data and agreed thermal, regulating and emergency-stop verification.