Performance Technical Parameters
Working range: -60°C to +260°C (continuous), short-term peak +310°C
Radial clearance: ≤Φ50mm: 0.15-0.25mm, Φ50-150mm: 0.25-0.40mm, Φ150-300mm: 0.40-0.65mm (per API 610)
Dimensional tolerances: ID ±0.015mm, OD ±0.020mm, thickness ±0.030mm
Surface roughness: Mating surface Ra≤0.4μm, non-working Ra≤1.6μm
Hardness range: Shore D 85-92 (pure PEEK), Shore D 92-98 (carbon fiber reinforced)
Compressive: ≥125MPa, flexural ≥170MPa
Tensile strength: ≥95MPa (pure), ≥130MPa (reinforced)
Wear rate: ≤0.02mm/1000h (clean water), ≤0.08mm/1000h (sand-containing <200mg/L)
Friction coefficient: Dry state 0.12-0.18, wet state 0.08-0.12
Chemical resistance: Resistant to 98% sulfuric acid, 50% sodium hydroxide, aromatics, ketones, alcohols.
Linear expansion: 4.7×10⁻⁵/K (pure), 3.2×10⁻⁵/K (30% CF reinforced)
Pressure capacity: ≤25MPa (static), ≤16MPa (dynamic)
Applicable speed: ≤4500rpm (standard), ≤3500rpm (minimum)
Inner diameter Φ20-Φ400mm, wall thickness 3-15mm, axial height 8-50mm. Supports non-standard customization.
Application Fields
Applied in API and ANSI pumps conveying corrosive media. Replaces bronze and stainless steel wear rings to avoid electrochemical corrosion. Service life in concentrated sulfuric acid and alkaline solutions exceeds metal by 3 times.
Used in high-temperature (150-180°C) and high-pressure (8-15MPa) environments. Reduces clearance wear by 50% compared to bronze, lowering power consumption by 2-4% with no frequent replacements needed during annual overhauls.
Used in reverse osmosis high-pressure pumps. Completely resistant to chloride ion corrosion (35,000ppm chlorides). Combined with ceramic/tungsten carbide shaft sleeves, inspection cycle extends to 18-24 months.
Resistant to sand-containing media and H₂S corrosion. Under sand content 150-300mg/L conditions, service life reaches 8,000-12,000 hours, far exceeding alloy steel rings.
Complies with FDA 21 CFR 177.2415 and EU 10/2011 food contact regulations. Withstands high-temperature steam sterilization (121°C, 30-min cycle), no metal ion precipitation, meeting GMP requirements.
Common Failure Causes and Remedial Measures
Causes: Wear exceeds 200% of initial; Hard particles > HV 1000; Dry friction time >30s; Axial vibration/radial runout >0.1mm.
Remedies: Replace when exceeding 150% of API 610 value. Install cyclone desander (<50μm). Ensure pump is filled with liquid before startup. Check bearing wear and coupling alignment.
Causes: Installation clearance <80% recommended; Thermal expansion error; Foreign objects lodged; Rotor concentricity >0.15mm.
Remedies: Reset clearance per API 610 standard (+ compensation for high temp). Thoroughly clean pump chamber; Limit axial play to ±0.5mm; Use laser alignment.
Causes: Excessive press-fit interference (>0.15mm); Sudden temperature change (>100°C/min); Insufficient wall thickness (<3mm); Material defects.
Remedies: Control press-fit interference at 0.03-0.08mm. Adopt low-temperature cold installation or heating installation. Strengthen incoming inspection (ultrasonic/X-ray).
Causes: Poor media lubricity; Insufficient shaft sleeve hardness (
Remedies: Increase pump NPSH available. Replace hard shaft sleeve (tungsten carbide, alumina ceramic, nitrided steel, HRC 55-70). Follow “soft-on-hard” principle.
Procurement Selection Essential Parameters
When ordering, purchasing engineers must provide:
- Pump model, impeller diameter, and wear ring installation location (impeller side / pump casing side).
- Wear ring dimensions (inner diameter × outer diameter × thickness).
- Mating shaft or impeller surface hardness and roughness.
- Working media characteristics (name, temperature, pH value, solid particle content and size).
- Pump speed, flow, head, and pressure parameters.
Selection conditions: Mating shaft sleeve or impeller ring surface hardness must be ≥HRC 45 (recommended ≥HRC 55), roughness ≤Ra0.8μm. For high-temperature conditions (>150°C), thermal expansion compensation calculation must be provided. Our company will provide selection recommendations and CAD drawing confirmation within 48 hours.
FAQ
Q1: What advantages does PEEK wear ring have compared to bronze wear ring?
Smaller clearance (20-30% reduction), internal leakage reduced by 40%, efficiency improved by 3-7%. High corrosion resistance (pH<5 or >9). Self-lubricating preventing seizure during dry friction. Lightweight (1/7 of bronze). Long life span and non-magnetic.
Q2: How to determine appropriate wear ring clearance?
Reference API 610 standard. Correction factors include high-temperature thermal expansion compensation, easy-to-crystallize media increase by 10-20%, and soft PEEK material increases. Final clearance = base clearance × correction factor (1.0-1.3).
Q3: What linear speed can PEEK wear ring withstand?
≤18m/s under standard clearance, ≤15m/s under minimum clearance. Exceeding safe speed causes friction heat and increased vibration. For high-speed pumps, adopt 30% carbon fiber reinforced PEEK.
Q4: How to install PEEK wear ring?
Options include: Press-fit method (interference 0.03-0.08mm), Hot installation method (heat casing to 80-100°C), Cold installation method (liquid nitrogen cooling to -40°C to -60°C), and Bonding method (Loctite 648 for small rings).
Q5: Can PEEK wear ring be used for particle-containing media?
Yes, but particle hardness should be
Q6: How to determine if wear ring needs replacement?
Replace when measured clearance exceeds 2 times initial value, pump efficiency drops >5%, power consumption increases >5%, or sudden increase in vibration/noise occurs.
Q7: How to choose between pure PEEK and carbon fiber reinforced PEEK?
Pure PEEK is ideal for clean water, low speed (<3000rpm), and stable temperatures. Carbon fiber reinforced offers higher hardness, lower expansion, and is suitable for high speed (>3000rpm) and particle-containing conditions.
Q8: When PEEK wear ring matches with stainless steel shaft sleeve, which will wear?
Following “soft-on-hard”, PEEK should wear. Ideal matching: Shaft sleeve hardness HRC 55-65, which is HRC 15-20 higher than PEEK. If sleeve is insufficiently hard (
About Dalian Allstar Material
Dalian Allstar Material is a professional enterprise focusing on PEEK and PI high-performance polymer research, development, and manufacturing. The company has a complete material modification, precision machining, and quality inspection system, equipped with Swiss imported high-precision lathes, coordinate measuring machines, and material performance laboratories.
Professionally provides customized wear ring solutions for centrifugal pumps and compressors, with products widely applied in chemical, petroleum, power, water treatment, food, and pharmaceutical fields, helping customers reduce maintenance costs and improve equipment efficiency.