The Hydraulic Hammer Delivered Was Not the Hydraulic Hammer Tested
Quote from chief_editor on April 12, 2026, 3:25 amMining and foundation contractors test Chinese hydraulic hammers at factory acceptance and receive different units at delivery. Model and specification substitution after FAT is a documented risk.
A foundation contractor in the Philippines sourced four hydraulic hammers from a Shandong manufacturer for a bridge foundation project — pile driving for a cable-stayed bridge across Manila Bay, high-impact service with defined energy class requirements. The factory acceptance test was conducted in Shandong in September. The witnessed test verified energy class, blow rate, and operating pressure. The buyer's engineer signed the FAT certificate. The hammers shipped in October.
When the units arrived in Manila and were put into service, the first pile set showed blow counts that were inconsistent with the energy class certified at the FAT. The pile was not refusing — the blow count was higher than the expected set for the energy class, indicating that the actual energy delivered per blow was lower than the FAT-certified value. The contractor's project engineer requested nameplate data verification and found that the serial numbers on the installed units were different from the serial numbers on the FAT certificates.
The four units that had been tested in Shandong were not the four units that had been shipped. The Shandong manufacturer had tested their demonstration units — which were in better condition and had been tuned for FAT performance — and had shipped production units from their standard inventory. The production units were the same model and had been manufactured to the same specification. They had not been individually tested to confirm they met the FAT-certified performance.
FAT Tests the Units You Test. It Does Not Test the Units You Receive.
The serial number discrepancy in the Manila case is an extreme version of a subtler but more common problem in Chinese capital equipment procurement: the units presented for factory acceptance testing are not always the same units that are subsequently shipped. The practice ranges from intentional substitution — as in Manila — to inadvertent swap during shipping preparation, to the more common case where the FAT unit is a freshly serviced or calibrated version of the same model and the shipped units are production units with the normal variation of a production run.
In all cases, the FAT result certifies the performance of the unit tested, not the performance of the unit delivered. Without serial number verification at delivery — confirming that the serial numbers on received units match the serial numbers on FAT certificates — the buyer has no assurance that the FAT test results describe the received equipment.
Serial number verification at delivery sounds obvious. It is systematically omitted in most delivery receipt procedures for Chinese capital equipment because the people doing the delivery receipt are logistics personnel, not technical personnel, and serial number cross-referencing against FAT certificates is not in a standard goods receipt checklist.
The Project Delay Was 34 Days. The Serial Number Check Was 20 Minutes.
The bridge foundation contractor's response to the serial number discrepancy was to suspend pile driving, contact the manufacturer, and initiate a parallel FAT on the actually-delivered units at an agreed third-party facility in Manila. This process — arranging the test, completing it, and resolving the commercial dispute about liability for the delay — took 34 days. During those 34 days, the pile rig was on standby, the project schedule was disrupted, and the contractor's liquidated damages exposure to the bridge owner was accumulating.
The final resolution: the Shandong manufacturer's delivered units were tested and found to meet 91% of the specified energy class — not the 100% of the FAT-certified units — which was within the contract tolerance band. The manufacturer was not in breach. The contractor had operating equipment. The 34-day delay was absorbed as a project cost.
A serial number check at delivery against the FAT certificate is a 20-minute task that prevents a 34-day dispute.
Keywords: hydraulic hammer China procurement | Chinese hydraulic hammer piling, foundation equipment China, excavator attachment China quality, hydraulic hammer specification China
Words: 622 | Source: Documented substitution case — hydraulic hammer procurement, Shandong to Philippines, 2023. Serial number discrepancy investigation, field FAT records, project delay documentation. | Created: 2025-01-15T11:40:00Z
Mining and foundation contractors test Chinese hydraulic hammers at factory acceptance and receive different units at delivery. Model and specification substitution after FAT is a documented risk.
A foundation contractor in the Philippines sourced four hydraulic hammers from a Shandong manufacturer for a bridge foundation project — pile driving for a cable-stayed bridge across Manila Bay, high-impact service with defined energy class requirements. The factory acceptance test was conducted in Shandong in September. The witnessed test verified energy class, blow rate, and operating pressure. The buyer's engineer signed the FAT certificate. The hammers shipped in October.
When the units arrived in Manila and were put into service, the first pile set showed blow counts that were inconsistent with the energy class certified at the FAT. The pile was not refusing — the blow count was higher than the expected set for the energy class, indicating that the actual energy delivered per blow was lower than the FAT-certified value. The contractor's project engineer requested nameplate data verification and found that the serial numbers on the installed units were different from the serial numbers on the FAT certificates.
The four units that had been tested in Shandong were not the four units that had been shipped. The Shandong manufacturer had tested their demonstration units — which were in better condition and had been tuned for FAT performance — and had shipped production units from their standard inventory. The production units were the same model and had been manufactured to the same specification. They had not been individually tested to confirm they met the FAT-certified performance.
FAT Tests the Units You Test. It Does Not Test the Units You Receive.
The serial number discrepancy in the Manila case is an extreme version of a subtler but more common problem in Chinese capital equipment procurement: the units presented for factory acceptance testing are not always the same units that are subsequently shipped. The practice ranges from intentional substitution — as in Manila — to inadvertent swap during shipping preparation, to the more common case where the FAT unit is a freshly serviced or calibrated version of the same model and the shipped units are production units with the normal variation of a production run.
In all cases, the FAT result certifies the performance of the unit tested, not the performance of the unit delivered. Without serial number verification at delivery — confirming that the serial numbers on received units match the serial numbers on FAT certificates — the buyer has no assurance that the FAT test results describe the received equipment.
Serial number verification at delivery sounds obvious. It is systematically omitted in most delivery receipt procedures for Chinese capital equipment because the people doing the delivery receipt are logistics personnel, not technical personnel, and serial number cross-referencing against FAT certificates is not in a standard goods receipt checklist.
The Project Delay Was 34 Days. The Serial Number Check Was 20 Minutes.
The bridge foundation contractor's response to the serial number discrepancy was to suspend pile driving, contact the manufacturer, and initiate a parallel FAT on the actually-delivered units at an agreed third-party facility in Manila. This process — arranging the test, completing it, and resolving the commercial dispute about liability for the delay — took 34 days. During those 34 days, the pile rig was on standby, the project schedule was disrupted, and the contractor's liquidated damages exposure to the bridge owner was accumulating.
The final resolution: the Shandong manufacturer's delivered units were tested and found to meet 91% of the specified energy class — not the 100% of the FAT-certified units — which was within the contract tolerance band. The manufacturer was not in breach. The contractor had operating equipment. The 34-day delay was absorbed as a project cost.
A serial number check at delivery against the FAT certificate is a 20-minute task that prevents a 34-day dispute.
Keywords: hydraulic hammer China procurement | Chinese hydraulic hammer piling, foundation equipment China, excavator attachment China quality, hydraulic hammer specification China
Words: 622 | Source: Documented substitution case — hydraulic hammer procurement, Shandong to Philippines, 2023. Serial number discrepancy investigation, field FAT records, project delay documentation. | Created: 2025-01-15T11:40:00Z