Sterling A0552321 Standard Pumps and Trim Based on Cooling Tower Capacities, American Standards

Figure 2: Standard Pumps and Trim Based on Cooling Tower Capacities

(Flow Based on 3 gpm per Ton)

American Standards

Capacity		Trim	Process	Recirculating
Nominal	Nominal flow	size	pump	pump
cooling tower tons	gallons	inches	hp	hp
20	60	2½”	5	3
30	90	2½”	7½	3
40	120	3”	7½	5
50	150	3”	10	5
60	180	4”	10	5
75	225	4”	15	7½
80	240	4”	15	7½
100	300	4”	20	7½
125	375	6”	20	10
150	450	6”	25	10
175	525	6”	30	15
200	600	6”	30	15
250	750	6”	40	20
300	900	6”	50	20

Pump horsepower	1½	3	5	7½	10	15	20	25	30	40	50	60
Amp draw 460/3/60	2.6	4.8	7.6	11	14	21	27	34	40	52	65	77
Shipping weight (lbs.) • P1	—	95	115	125	165	180	300	310	400	465	710	730
• P2	60	90	115	275	320	425	510	630	670	—	—	—

Trim size (inches)	2	2½	3	4	6	8
Maximum flow (gpm)	50	90	160	320	900	2,000
Shipping weight (lbs.)	25	35	50	75	120	165

Metric Standards

Capacity		Trim	Process			Recirculating
Nominal refrigeration	Nominal flow	size		pump		pump
Tower water, Kcal/hr	liters	mm Dia.	hp		kW	hp	kW
75,600	227	64	5		3.73	3	2.24
113,400	341	64	7½		5.59	3	2.24
151,200	454	76	7½		5.59	5	3.73
189,000	568	76	10		7.50	5	3.73
226,800	682	102	10		7.50	5	3.73
283,500	852	102	15		11.19	7½	5.59
302,400	909	102	15		11.19	7½	5.59
378,000	1,135	102	20		14.91	7½	5.59
472,500	1,419	152	20		14.91	10	7.50
567,000	1,703	152	25		18.64	10	7.50
661,500	1,987	152	30		22.37	15	11.19
756,000	2,271	152	30		22.37	15	11.19
945,000	2,839	152	40		29.93	20	14.91
1,134,000	3,406	152	50		37.29	20	14.91

Pump	1½/1.12	3/2.24	5/3.73	7½/5.59	10/7.5	15/11.19	20/14.91	25/18.64	30/22.37	40/29.93	50/37.29	60/44.7
horsepower/kW												4
Amp draw 460/3/60	2.6	4.8	7.6	11	14	21	27	34	40	52	65	77
Ship weight (Kg) • P1	—	44	53	57	75	82	137	141	182	211	323	332
• P2	28	41	53	125	146	193	232	286	304	—	—	—

Trim size (inches)	2	2½	3	4	6	8
Maximum flow (lpm)	189	340	624	1,211	3,406	7,570
Shipping weight (Kg)	12	16	23	35	55	75

Pump Tanks Chapter 6: Appendix 22 of 36