Bronze Bushings & Heat Exchangers Manufacturer Since 1998
At Jiaerda Machinery, we manufacture custom copper bushings and advanced heat exchangers, designed to meet the high demands of industries including energy, marine, mining, and machinery. Whether you need a robust bearing oil cooler or a precision heat exchanger, we provide tailored solutions for every project.
Who We Are
JIAERDA Machinery is a high-tech enterprise integrating design, production, sales, and service.
The bronze bushings and coolers are manufactured in two separate factories, located 1,000 meters apart.heat exchangers. It features two temperature-controlled rooms: a CNC machining workshop and a CMM inspection room.
We are committed to becoming a global leader in sliding bearing system solutions, continuously creating maximum value for our customers. We have established long-term, stable partnerships with companies such as GE, VOITH, ALSTOM, and SIEMENS.
Our Products
We offer a wide range of custom copper bushings, heat exchangers, each designed to meet the unique needs of various industrial applications. Whether it’s for bearing oil systems, marine engines, or hydraulic circuits, our products are built for reliability, efficiency, and long-term performance.
Standard production process
80% of our project orders are customized series, so we need customers to provide drawings and specifications.
| Bronze Bushing Production (Traceable) | Heat Exchanger Fabrication (Cooler) |
|---|---|
| 1 Material Certification & Alloy ID Heat‐cert + spectro report (C83600 / C95400 / …) linked to PO | 1 Duty & Drawing Approval Thermal sizing + GA drawing sign-off ≤ 5 d |
| 2 Melting & Alloying Induction melt > 1100 °C, spectrometer every heat | 2 Materials Procurement MTR-backed shell, tube, tube-sheet, baffle sets |
| 3 Centrifugal / Continuous Casting Yield ≥ 92 %, chill depth logged | 3 Shell Rolling & Welding SAW/TIG seam welds, 10 % RT (X-ray) pass |
| 4 Spectrochem & Grain Check Cu-Sn-Pb window ±0.2 % verified | 4 Tube-Bundle Build Tubes cut, U-bent or straight; expanded/welded into tube sheet |
| 5 Rough & Finish CNC Machining ID/OD Cpk ≥ 1.67, Ra ≤ 0.8 µm | 5 Assembly & Baffle Fit-Up Baffle pitch set for shell-side velocity 0.8–1.2 m/s |
| 6 CMM Dimensional Inspection 100 % critical dims to ± 0.01 mm | 6 NDT on Welds PT for tube-to-sheet, RT for shell welds; zero reportable defects |
| 7 NDT (PT / UT as required) UT wall > 90 % nominal; PT no indications | 7 Pressure & Helium Leak Test Hydro 1.5× design; leak < 10⁻⁶ mbar·L/s |
| 8 Surface Finish / Deburr Chamfer, groove, oil-way clean to ISO 4406 | 8 Surface Treatment Pickle/passivate (SS) or epoxy coat (CS) |
| 9 Final QC Pack Hardness, spectro, CMM sheets bound to COA | 9 Final QC & Docs Data-book: MTR, NDT, hydro, assembly pictures |
| 10 VCI + Crate Packaging Part ID & QR trace inside | 10 Seaworthy Packaging End-cap protectors, shrink-wrap, fumigated skid |
| 11 FOB Ningbo/Shanghai Shipment Booking within 24 h of QC OK | 11 FOB Ningbo/Shanghai Shipment Container or flat-rack as per size/weight |
Our Manufacturing Capabilities
We have classification society certification, special equipment manufacturing certification, and ISO certification for our factory. If you need more information, please contact us.
We believe that a website or a wall of certificates alone cannot earn your complete trust. Everything starts with communication.
Industries We Serve
Our expertise spans a wide range of industries, from energy & power to marine & offshore, where precision and reliability are paramount. We cater to diverse sectors, offering custom-engineered solutions to solve the most complex bearing and thermal management challenges.
Energy & Power
Marine & Offshore
Oil & Gas
Mining & Cement
Metals & Metallurgy
Industrial Machinery
What Our Clients Say
Our clients trust Jiaerda Machinery for reliable, high-performance solutions. Here’s how our products have solved key challenges in various industries.
Faq About bushing and heatexchanger
Which bronze alloy is best for heavy radial loads above 80 MPa?
Aluminium bronze C95400: yield ≥ 310 MPa, elongation ≈ 10 %. In field tests it handles PV values up to 5.6 MPa · m/s with oil lubrication.
How do you verify chemical composition before casting?
Every 350 kg melt is probed with an OBLF optical spectrometer; results are logged against the heat number and attached to the Certificate of Analysis (CoA). Acceptance window: Cu ± 0.20 %, Sn ± 0.10 %, Pb ± 0.05 %.
What machining tolerances can you guarantee on ID and OD?
Cylindrical grinding + CMM inspection: ± 0.01 mm on ID ≤ Ø120 mm; ± 0.015 mm on larger IDs. Concentricity ≤ 0.005 mm TIR for matched bearing pairs.
How is porosity controlled in centrifugal cast bushings?
Melt is poured at 9–12 m/s peripheral speed; directional solidification forces gas voids to the bore centre, which is later bored away, leaving a dense wall with < 1 % micro-porosity (ASTM E562).
What surface finish do you supply on bearing surfaces?
Standard finish Ra 0.8 µm ground; mirror Ra 0.4 µm available for boundary-lubricated shafts.
Can you machine oil grooves or graphite plugs?
Yes. V-groove, double-helical, or ring-segment grooves to DIN 1494; graphite inserts Ø4–6 mm at 20 % area coverage for dry-start applications.
How long will a C93200 bushing last at 2 MPa and 2 m/s sliding speed?
In ISO 2818 rig tests, wear rate is 0.005 mm per 1 000 h; practical service life exceeds 15 000 h with ISO VG 68 oil and 3 µm filtration.
What clearance should I allow between shaft and bushing?
Rule-of-thumb: 0.001 × shaft Ø for shaft < Ø75 mm; refine using thermal expansion coefficient (α ≈ 18 µm/m·K) if operating above 120 °C.
Do you perform non-destructive testing?
UT wall-thickness mapping (5 MHz probe) on ≥ Ø80 mm parts; PT on end faces for crack detection. Acceptance per ASTM E192/E165.
How are bushings protected for export shipping?
Dip-coated in VCI oil, heat-sealed in 100 µm poly, then packed in ISPM-15 plywood crates with silica gel. Corrosion claim rate over five years: 0 %.
Which design codes do you follow?
ASME VIII Div. 1 for pressure parts; TEMA class R default. CE-marked units comply with PED 2014/68/EU Module H.
How do you calculate heat-transfer area?
HTRI Xchanger Suite v9.1, fouling factor per TEMA Table F-1; we target log-mean ΔT utilisation ≥ 85 %.
What materials withstand seawater without chlorine dosing?
CuNi 90/10 or Ti Gr 2 tubes; both show < 0.02 mm/yr corrosion at 30 °C, 3.5 % salinity.
Maximum design pressure and temperature you can build?
Up to 30 bar (g) shell-side and 425 °C with SA-516-70 shell + SS 316L tubes; higher on request with chloride-free duty.
How is leak integrity proven?
Hydro-test at 1.5× design pressure for 30 min, then helium mass-spectrometer sniff test; acceptance < 1 × 10⁻⁶ mbar·L/s.
What fouling factor do you assume for lube-oil coolers?
0.0002 m²·K/W (TEMA “clean oil”) — doubles service interval compared with 0.0004 if oil cleanliness ISO 4406 ≤ 17/15/12.
Can you supply spare tube bundles?
Yes; we laser-scan legacy tube sheets and deliver drop-in bundles within 25 days, tubes mechanically expanded + seal-welded.
How do you mitigate galvanic corrosion in mixed-metal units?
Explosive-clad SS 316L / SA-516 tube sheets, dielectric sleeves, and zinc anodes sized to 10 mA/m² exposed area.
What documentation do you provide with each unit?
Complete databook: MTRs, WPS/PQR, weld maps, NDT results, hydro certificate, helium leak sheet, as-built GA, and nameplate copy (PDF & hard copy).
Standard lead time for a 2 m² 316L cooler?
30 calendar days ex-works after drawing approval; freight by LCL adds 10–20 days to most ports.
Get a 24-Hour Custom Quote
Send us your drawing, and quantity requirements—and our engineering team will match the right bronze alloy or heat-exchanger configuration.
You’ll receive a firm price, lead time, and DFM suggestions within one business day. Every file is covered by our NDA and stored on secure servers.
