Category
Rotating Equipment
Subcategory
Driver
Applicable standards
3
Issuing bodies
1
Description
Special-purpose gearbox (API 613) and high-speed couplings (API 671).
Applicable Standards (3)
API — 3 standards
API 613
Special-Purpose Gear Units for Petroleum, Chemical and Gas Industry Services
Single- and double-helical, parallel-shaft, one- or two-stage speed-increasing or -reducing gear units.
Key requirements (8)
- Special-purpose gear units for petroleum, chemical, gas service.
- Service factor: minimum 1.4 (API minimum) — typical 1.5–1.8.
- Single-helical or double-helical (herringbone) tooth form.
- AGMA quality grade Q12 minimum (high precision).
- Mechanical run test: 4 hours at maximum continuous speed.
- Lube oil: API 614 system; oil flow ≥ 4× heat removal need at design.
- Vibration limits per API 670.
- Backlash: minimum specified to prevent excessive thermal seizure.
API 671 / ISO 10441
Special-purpose Couplings for Petroleum, Chemical and Gas Industry Services
Disc-pack couplings for high-speed special-purpose machinery.
API 670
Machinery Protection Systems
Vibration, axial-position, bearing temperature monitoring for rotating machinery.
Key requirements (7)
- Machinery protection systems for rotating equipment.
- Standard sensors: 8 mm proximity probes (eddy current), velocity sensors, accelerometers, KPH probes for speed.
- Signal: 200 mV/mil sensitivity for proximity probes (5 V across 25 mil gap).
- Standard alert/shutdown: 25 µm Alert / 50 µm Trip on shaft displacement (typical, tunable).
- Bearing temperature RTD: 100 Ω Pt; 110 °C Alert / 120 °C Trip typical.
- Casing vibration (accelerometer / velocity): 7.6 mm/s RMS typical alert for centrifugal machines.
- API 670 monitoring system has 2-out-of-3 voting for trips, with bypass keys for maintenance.