Convert Pounds per minute to Grains per hour
Convert Pounds per minute (lb/min) to Grains per hour (gr/h) instantly and accurately.
Conversion Formula
gr/h = lb/min × 420000
About Pounds per minute
The pound per minute (lb/min) equals 0.45359237/60 ≈ 7.560×10⁻³ kg/s, the standard unit for US fire-suppression system design (sprinkler flow demand) and HVAC hydronic loop balancing. A fire-sprinkler head at 15 psi discharges roughly 30-40 lb/min of water; industrial humidifiers are rated in lb/min of steam. 1 lb/min ≈ 7.560×10⁻³ kg/s = 60 lb/h.
About Grains per hour
The grain per hour (gr/h) equals 6.479891×10⁻⁵/3600 ≈ 1.800×10⁻⁸ kg/s, used in HVAC psychrometric calculations for dehumidifier capacity and moisture-removal rates. ASHRAE load calculation spreadsheets report latent loads in grains of water per hour; a typical residential dehumidifier removes 5×10⁵-2×10⁶ gr/h. 1 gr/h ≈ 1.800×10⁻⁸ kg/s.
Quick Reference Table
| Pounds per minute (lb/min) | Grains per hour (gr/h) |
|---|---|
| 1 lb/min | 420000 gr/h |
| 2 lb/min | 840000 gr/h |
| 5 lb/min | 2100000 gr/h |
| 10 lb/min | 4200000 gr/h |
| 25 lb/min | 10500000 gr/h |
| 50 lb/min | 21000000 gr/h |
| 100 lb/min | 42000000 gr/h |