That depends on what substance is flowing.
150 gallons of air: very few pounds
150 gallons of water: around 1,250 pounds
150 gallons of molten lead: a lot more than 1,250 pounds
2.7 gpm
One family, quarter acre lot: 10-12 gallons per minute at 50 pounds per square inch.
4.483 US gallons per minute.
One US gallon is equal to 3.78 liters. One liter is equal to 2.2 pounds. So, 18 pounds is equivalent to around 8.2 gallons.
96 gallons per minute = about 363.4 liters per minute.
42 gallons of water is 350.7 pounds
One cubic foot per minute = 7.481 US gallons per minute.
10 US gallons is approximately 83.5 pounds
30 pounds of water is 3.593 gallons.
About 250.5 pounds for 30 US gallons.
10 gallons of water is 83.5 pounds
50 gallons of water per minute equals 3,000 gallons per hour.