Dongguan HydroBlue Co., Ltd.
| Pump Package | Carton and Wooden Cases |
| Origin | China |
| Material 2 | Stainless Steel, Duplex Ss, Cast Alloy Steel |
| Specification | According to the drawings |
| HS Code | 84139100 |
| Material 1 | Cast Iron, Wear-Resistant Cast Iron, Cast Steel |
| Trademark | Vinsome |
| Certificate | ISO9001:2015, ISO14001:2004, API Specification Q1 |
| Transport Package | Carton and Wooden Cases |
| Material Standard | ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct |
| Mould | Investment Casting Mould, Sand Casting Mould |
| Production Capacity | 10, 000 Tons Per Year |
| Types of Welding Parts | OEM/ODM |
| Pump Model. | Mc/MD/G Sg/CD8/Bbtd/Msd/Mca/Mce/Mcv |
| Testing | Dynamic Balancing |
| Model NO. | spare parts |
View Detail Information
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Product Specification
| Pump Package | Carton and Wooden Cases | Origin | China |
| Material 2 | Stainless Steel, Duplex Ss, Cast Alloy Steel | Specification | According to the drawings |
| HS Code | 84139100 | Material 1 | Cast Iron, Wear-Resistant Cast Iron, Cast Steel |
| Trademark | Vinsome | Certificate | ISO9001:2015, ISO14001:2004, API Specification Q1 |
| Transport Package | Carton and Wooden Cases | Material Standard | ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct |
| Mould | Investment Casting Mould, Sand Casting Mould | Production Capacity | 10, 000 Tons Per Year |
| Types of Welding Parts | OEM/ODM | Pump Model. | Mc/MD/G Sg/CD8/Bbtd/Msd/Mca/Mce/Mcv |
| Testing | Dynamic Balancing | Model NO. | spare parts |
| High Light | Sulzer pump stainless steel casing cover ，high precision Sulzer pump parts ，Sulzer pump volume casing cover | ||
Dongguan HydroBlue Co., Ltd. supplies replacement casing covers for SULZER centrifugal pumps, covering process, end-suction, and split-case models. Our engineering team of eight specialises in pressure boundary components, seal housing design, and precision machining, with research collaborations at Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology. We also supply complete pump spares, mechanical seal assemblies, motor control enclosures, VFD cabinets, and provide overseas field engineering support including 3D scanning of worn parts.
Send us your SULZER pump model and casing cover part number for a compatibility check and quotation.
The casing cover is the pressure-retaining component on the shaft side of the pump. It closes the pressure chamber, houses the mechanical seal or packing gland, and provides the stationary seal face mounting surface. Its seal chamber bore is the single most critical dimension — if the bore is worn, oval, or corroded, the mechanical seal will not seat correctly and will fail prematurely regardless of seal quality. Common failure modes include seal chamber bore wear from repeated seal replacement, flange face corrosion from gasket leakage, and stress cracking from pressure cycling.
The seal chamber bore should be inspected at every major overhaul. The table below shows acceptance limits:
|
Parameter |
New Condition (Our Supply) |
In-Service Limit |
|---|---|---|
|
Bore diameter tolerance |
H7 fit (±0.02–0.04 mm depending on diameter) |
Within H8 fit. Oversize beyond H8 → replace or fit a seal chamber sleeve |
|
Bore ovality |
≤ 0.02 mm TIR |
≤ 0.08 mm. Exceeding → bore is distorted from thermal or pressure cycling |
|
Surface finish (Ra) |
≤ 0.8 µm |
≤ 1.6 µm. Above this → seal O-ring will leak past the surface |
|
Concentricity to shaft axis |
≤ 0.05 mm TIR |
≤ 0.10 mm. Higher → seal rotary face will run eccentrically |
The flange face where the casing cover meets the pump casing must be flat and free of corrosion pitting to ensure a leak-free joint. Key checks:
|
Service |
Recommended Material |
Why |
|---|---|---|
|
Clean water, low pressure |
Cast iron HT250 |
Economic, adequate for non-corrosive service below 16 bar |
|
Sand-laden water, slurry |
Wear-resistant cast iron |
Higher hardness resists erosion at seal chamber entry |
|
Seawater, brackish water |
Duplex 2205 or cast iron + epoxy lining |
Chloride pitting resistance; lining option for budget-conscious projects |
|
Chemical process |
SS316 / CD4MCu |
Broad chemical resistance; CD4MCu for combined corrosion and wear |
|
High-temp process (>200 °C) |
Cast steel WCB / alloy steel |
Strength retention at elevated temperatures |
Q1: Can a worn seal chamber bore be repaired, or must the cover be replaced?
If the bore is worn within 0.2–0.3 mm oversize, a seal chamber sleeve (stainless steel or duplex) can be pressed in and machined to restore the correct bore diameter. If the bore is oval by more than 0.15 mm or has deep corrosion pitting, replacement is the more reliable option.
Q2: What causes a casing cover flange face to leak?
Most common causes: a distorted flange face (from over-torquing bolts unevenly), a corroded or pitted gasket sealing surface, or a mismatch between the cover flange and the casing flange flatness. Always check flange face flatness with a straight edge before installing a new gasket.
Q3: Do you supply the casing cover with the mechanical seal pre-installed?
Yes, on request. We can supply the cover with the seal chamber machined, the stationary seal face fitted, and the bore surface finished to the seal manufacturer's specification. This is recommended for pumps in critical service where seal alignment is difficult to achieve on-site.
Q4: What material do you recommend for a high-pressure boiler feed pump casing cover?
Cast steel (WCB or WC6) with hard chrome plating in the seal chamber bore. Cast steel retains strength at elevated temperatures, and hard chrome resists wear from the seal rotary face at high surface speeds.
Q5: What warranty applies?
12 months from commissioning or 18 months from shipment. Covers material defects, dimensional non-conformance, and hydrostatic test integrity. Corrosion from incompatible media or mechanical damage during installation is excluded.
Company Details
Business Type:
Manufacturer,Trading Company
Year Established:
2006
Total Annual:
$10 Million-US$50 Million
Employee Number:
50~100
Ecer Certification：
Verified Supplier
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