Friction Loss Reference Table

The laminated card for the cab door: friction loss by flow and hose size, straight off the same formula the simulator uses. Pick the sizes you carry and the flow range you teach, then print a full sheet or a pocket card.

Flow axis (rows)

From50 to 2000 GPM

To50 to 2000 GPM

Step25 to 500 GPM

Lay length

Show total loss for a set lay length

Off: cells read friction loss per 100 ft — multiply by your lay length in hundreds of feet.

Friction loss (psi) per 100 ft

FL = C × Q² × L

Friction loss in psi per 100 ft of hose, by flow and hose diameter.
GPM	1.5″	1.75″	2″	2.5″	3″	4″	5″
100	24	16	8	2	1	0	0
150	54	35	18	5	2	0	0
200	96	62	32	8	3	1	0
250	150	97	50	13	5	1	1
300	216	140	72	18	7	2	1
350	294	190	98	25	10	2	1
400	384	248	128	32	13	3	1
450	486	314	162	41	16	4	2
500	600	388	200	50	20	5	2
550	726	469	242	61	24	6	2
600	864	558	288	72	29	7	3
650	1014	655	338	85	34	8	3
700	1176	760	392	98	39	10	4
750	1350	872	450	113	45	11	5
800	1536	992	512	128	51	13	5
850	1734	1120	578	145	58	14	6
900	1944	1256	648	162	65	16	6
950	2166	1399	722	181	72	18	7
1000	2400	1550	800	200	80	20	8

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Friction Loss Reference

Friction loss (psi) per 100 ft of hose · FL = C × Q² × L

Friction loss in psi per 100 ft of hose, by flow and hose diameter.
GPM	1.5″	1.75″	2″	2.5″	3″	4″	5″
100	24	16	8	2	1	0	0
150	54	35	18	5	2	0	0
200	96	62	32	8	3	1	0
250	150	97	50	13	5	1	1
300	216	140	72	18	7	2	1
350	294	190	98	25	10	2	1
400	384	248	128	32	13	3	1
450	486	314	162	41	16	4	2
500	600	388	200	50	20	5	2
550	726	469	242	61	24	6	2
600	864	558	288	72	29	7	3
650	1014	655	338	85	34	8	3
700	1176	760	392	98	39	10	4
750	1350	872	450	113	45	11	5
800	1536	992	512	128	51	13	5
850	1734	1120	578	145	58	14	6
900	1944	1256	648	162	65	16	6
950	2166	1399	722	181	72	18	7
1000	2400	1550	800	200	80	20	8