Procuring high temperature pumps requires careful specification of design conditions, materials, seals, testing, and documentation. This guide covers API 610 data sheet preparation, material selection, seal specification, testing requirements (mechanical run, performance, NPSH, hydrostatic), spare parts, documentation, and vendor evaluation for boiler feed, thermal oil, and hot water circulation pumps.
Procuring high-temperature pumps requires careful specification of operating conditions, materials, testing, and documentation. This guide provides a comprehensive procurement framework for high-temperature pumps in power generation, oil refining, chemical processing, and industrial heating applications.
Pre-Procurement: Define Requirements
Process Data
| Parameter | Why It Matters | Example |
|---|
| Fluid composition | Material selection, corrosion | Thermal oil, molten salt, boiler water |
| Flow rate (normal/min/max) | Pump sizing, efficiency | 100 m³/h normal, 120 max |
| Differential head | Impeller diameter, stages | 150 m at normal flow |
| Temperature (normal/min/max) | Material, seal, expansion | 350°C normal, 400°C max |
| Suction pressure | NPSHa, casing rating | 5 bar abs at pump flange |
| Discharge pressure | Casing rating, seal | 20 bar abs at pump flange |
| Specific gravity | Power, pressure calculation | 0.85 at operating temp |
| Vapor pressure | NPSHa, cavitation | 2.5 bar at 350°C |
| Viscosity | Efficiency correction | 5 cP at 350°C |
| Solids/abrasives | Material, wear design | None / 50 ppm / 5% solids |
| Corrosiveness | Material selection | Mild / moderate / severe |
Operating Conditions
- Continuous vs intermittent duty
- Startup/shutdown frequency (thermal cycling)
- Parallel operation (number of pumps, load sharing)
- Standby requirements (100% spare, 50% spare, no spare)
- Turn-down range (minimum flow, maximum flow)
- Transient conditions (trip, startup, load rejection)
- Ambient conditions (temperature, humidity, altitude, hazardous area)
- Noise requirements (OSHA, plant standard — typically <85 dBA)
Site Conditions
- Location: indoor/outdoor, sheltered/exposed
- Altitude: affects motor cooling, NPSH (atmospheric pressure)
- Ambient temp range: affects motor rating, lubrication
- Seismic zone: seismic qualification (if safety-related)
- Hazardous area classification: Class I Div 1/2, Zone 1/2, ATEX
- Power supply: voltage, frequency, phase, available fault current
- Utilities: cooling water, instrument air, steam, nitrogen
- Piping: suction/discharge line size, layout, expansion joints
Pump Specification
Standard Selection
- API 610: Petroleum, petrochemical, gas industry — most common for high-temp process pumps
- API 682: Shaft sealing systems for centrifugal pumps
- ISO 13709: International equivalent of API 610
- ASME B73.1: Horizontal end-suction chemical pumps (lower temp, less severe)
- ASME B73.2: Vertical in-line chemical pumps
- Hydraulic Institute: General pump standards, testing
- Nuclear: 10 CFR 50, ASME Section III, IEEE 344 (safety-related)
- For most high-temp industrial: specify API 610 (OH2, BB2, BB3, VS4, VS6 as appropriate)
Pump Type Selection
| Application | Recommended Type | API 610 Type |
|---|
| General high-temp process | Horizontal end-suction, centerline mount | OH2 |
| High pressure, moderate flow | Horizontal multistage, between bearings | BB3/BB4/BB5 |
| Large flow, moderate head | Horizontal split case, double suction | BB1/BB2 |
| Sump/tank, corrosive | Vertical sump, wet pit | VS4 |
| High pressure, hazardous | Vertical double casing | VS6 |
| Low flow, high head | Horizontal multistage, radial split | BB4/BB5 |
| Boiler feedwater | Horizontal multistage, barrel | BB4/BB5 |
Material Specification
- Use API 610 material classes (Class S-1 through S-9)
- Class S-1: carbon steel (general, <350°C, non-corrosive)
- Class S-2: 316 stainless (general corrosive, <400°C)
- Class S-3: 316 + Ni-resist (abrasive/corrosive)
- Class S-4: duplex (high strength, chloride, <250°C)
- Class S-5: 25Cr (high temp, <550°C)
- Class S-6: Alloy 20 (severe corrosive)
- Class S-7: Hastelloy C (severe corrosive, high temp)
- For high-temp: specify material per temp and corrosion (see material selection guide)
- For high-temp chemical pumps: verify material compatibility with specific chemical
Seal Specification
- API 682 seal type: Type A (single), Type B (double), Type C (double, cartridge)
- Arrangement: Arrangement 1 (single), 2 (double, unpressurized), 3 (double, pressurized)
- Seal face: SiC vs SiC (high temp), SiC vs carbon (general), tungsten carbide
- Springs: Inconel 718 (high temp/corrosion)
- Elastomers: limited to <200°C; above use metal bellows or PTFE wedge
- Barrier/buffer fluid: for double seals (water, glycol, oil)
- Plan selection: Plan 11 (recirculation), Plan 21 (recirculation + cooler), Plan 32 (injection), Plan 52/53 (double seal)
- For high-temp: Plan 21 or 32 (cool seal), metal bellows seal
Bearing and Lubrication
- Bearing type: rolling element (standard), fluid film (high power/high temp)
- Lubrication: grease (low temp, low speed), oil ring (moderate), oil circulation (high power/high temp)
- Bearing housing: finned (air cooling), water-cooled (high ambient/high power)
- Bearing material: 52100 (standard), M50 (high temp), ceramic hybrid (high speed)
- For high-temp: oil circulation with cooler, water-cooled housing
- Include bearing temperature monitors (RTD) and vibration sensors
Driver Specification
- Motor: NEMA or IEC, TEFC (standard), TEBC (high ambient), WPI (weather-protected)
- Insulation class: Class F (standard), Class H (high temp)
- Service factor: 1.15 (standard), 1.0 (API)
- VFD: if variable speed required (specify VFD-rated motor, insulated bearings)
- Steam turbine: for high-power, high-temp, or where steam available
- Gear drive: for high-speed pumps (boiler feed, high-pressure)
- For high-temp: verify motor derating at ambient temp, use VFD-rated if speed control
Testing Requirements
Mechanical Test
- Hydrostatic test: casing at 1.5x design pressure, 10 min, no leakage
- Mechanical running test: at no load, check vibration, temperature, noise
- Performance test: verify head-flow-efficiency curve per ASME PTC 8.2 / ISO 9906
- NPSH test: if critical, verify NPSHr at rated flow (3% head drop)
- Full-load test: at rated flow and head, check power, vibration, temperature
High-Temperature Test
- Hot running test: at operating temp (if required by spec or critical service)
- Thermal growth verification: measure shaft centerline movement at temp
- Seal test at temp: verify seal performance at operating temp
- Bearing temp test: verify bearing temp stabilizes below limit (typically <90°C)
- For critical high-temp service: specify hot test at manufacturer facility
NDT and Inspection
- Casting inspection: visual, radiography (RT), ultrasonic (UT) per API 610
- Weld inspection: RT, UT, dye penetrant (PT), magnetic particle (MT)
- Impeller: balance (API 610 Grade 6.3 or 2.5), NDT if critical
- Shaft: UT for inclusions, surface hardness check
- Pressure boundary: 100% RT/UT for critical/high-pressure service
- Material verification: PMI (positive material identification) for alloy materials
Documentation Requirements
| Document | Purpose | When Required |
|---|
| Data sheet (API 610) | Complete pump specification | Always |
| Performance curve | Head-flow-efficiency-NPSHr | Always |
| General arrangement drawing | Dimensions, weights, connections | Always |
| Cross-section drawing | Internal construction, materials | Always |
| Material test report (MTR) | Material certification (EN 10204 3.1/3.2) | Alloy/critical |
| Test report | Hydro, mechanical, performance | Always |
| Seal data sheet (API 682) | Seal specification, plan | Always |
| O&M manual | Operation, maintenance, spare parts | Always |
| Spare parts list | Recommended spares, part numbers | Always |
| Lubrication chart | Oil/grease type, intervals | Always |
| Seismic qualification | Test/analysis report | Safety-related |
| Nuclear QA documentation | 10 CFR 50 App B, NQA-1 | Nuclear safety |
Procurement Process
- Define requirements: Process data, operating conditions, site conditions, standards
- Prepare specification: API 610 data sheet, material class, seal plan, testing, documentation
- Identify suppliers: Pre-qualify based on references, capability, quality system
- Issue inquiry: Specification + data sheet + commercial terms
- Evaluate bids: Technical compliance first, then commercial (TCO, not just price)
- Technical clarification: Resolve deviations, confirm selections
- Award purchase order: Include all specs, drawings, testing, documentation requirements
- Design review: Review GA drawing, cross-section, material selection, seal plan
- Manufacturing surveillance: Witness key tests (hydro, performance, NDT)
- Factory acceptance test (FAT): Witness performance test, verify all requirements
- Shipping and preservation: Proper packaging, rust prevention, documentation
- Installation and commissioning: Supervise installation, alignment, startup
- Post-commissioning: Performance verification, training, spare parts stocking
Common Procurement Mistakes
- Under-specifying temperature: Use max temp, not normal. Material/seal rated for max.
- Ignoring NPSH: Calculate NPSHa at all conditions, specify NPSHr with margin.
- Wrong material class: Don't use carbon steel for corrosive or >400°C. Verify compatibility.
- Single seal for hazardous: Use double seal (API 682 Arrangement 3) for hazardous/high-temp.
- No spare parts: Specify 2-year spare parts, critical spares (seal, bearing, impeller).
- No testing: Require performance test, hydro test, NDT. Don't skip FAT.
- Price-only evaluation: Evaluate TCO (efficiency, maintenance, reliability, life).
- Ignoring thermal growth: Specify centerline support, verify piping flexibility.
- No minimum flow: Specify minimum flow recirculation for high-temp pumps.
- Wrong driver: Verify motor derating at ambient, use VFD-rated if variable speed.
Procurement Recommendations
- Use API 610 data sheet as specification basis for all high-temp process pumps
- Specify material class based on max temp and corrosion (not normal temp)
- For general high-temp: specify API 610 OH2 pump with appropriate material class
- For high-pressure: specify BB3/BB4/BB5 multistage, between bearings
- For zero leakage: specify a magnetic drive pump (sealless, zero-leakage) or a canned motor pump
- For boiler feed: specify multistage boiler feed pump with inducer
- Specify API 682 seal with appropriate plan (Plan 21/32 for high temp)
- Require performance test per ASME PTC 8.2 / ISO 9906 Grade 1 or 2
- Require MTR (EN 10204 3.1) for all pressure-containing parts
- Require NDT per API 610 (RT, UT, PT as applicable)
- Include 2-year spare parts list and critical spares in PO
- Specify centerline support for all high-temp pumps (>150°C)
- Require minimum flow recirculation (or specify system requirement)
- Include vibration monitoring (accelerometers) and bearing RTDs
- Evaluate TCO, not just purchase price
Related Industries
High-temperature pump procurement principles apply to power generation (fossil, nuclear, solar), oil and gas (refinery, upstream, pipeline), chemical processing (high-temp, corrosive), metals processing (furnace, rolling), and pulp and paper (digester, recovery boiler). The core principle — thorough specification, proper material selection, rigorous testing, and complete documentation — is consistent across high-temperature pump applications.
C
Cindy
Technical Content Engineer
10+ years bridging pump engineering and technical communication. Background in slurry pump design, water treatment systems, and pump standards compliance (ISO, ASME, API). Focuses on translating complex pump technology into actionable guidance for plant engineers and procurement teams.