Convert Pounds per day to Long tons per second
Convert Pounds per day (lb/d) to Long tons per second (long ton/s) instantly and accurately.
Conversion Formula
long ton/s = lb/d × 5.166997354e-9
About Pounds per day
The pound per day (lb/d) equals 0.45359237/86400 ≈ 5.249×10⁻⁶ kg/s, used in wastewater engineering for reporting biochemical oxygen demand (BOD) loads, nutrient loadings, and sludge production. US NPDES permits set effluent mass-load limits in lb/d; a municipal WWTP serving 10 000 people generates roughly 1 500-3 000 lb/d of dry sludge solids. 1 lb/d ≈ 5.249×10⁻⁶ kg/s.
About Long tons per second
The long ton per second (long ton/s) equals 1 016.0469088 kg/s, based on the UK long ton of 2 240 lb used historically in British heavy industry and naval engineering. It quantifies extremely high discharge rates such as large dam break surges or catastrophic industrial spillages. 1 long ton/s = 1 016.0469088 kg/s ≈ 1.016 t/s ≈ 1.120 short ton/s.
Quick Reference Table
| Pounds per day (lb/d) | Long tons per second (long ton/s) |
|---|---|
| 1 lb/d | 5.167 × 10-9 long ton/s |
| 2 lb/d | 1.033 × 10-8 long ton/s |
| 5 lb/d | 2.583 × 10-8 long ton/s |
| 10 lb/d | 5.167 × 10-8 long ton/s |
| 25 lb/d | 1.292 × 10-7 long ton/s |
| 50 lb/d | 2.583 × 10-7 long ton/s |
| 100 lb/d | 5.167 × 10-7 long ton/s |