Page 61 - HVAC Pump Handbook

Rishel_CH03.qxd 20/4/06 5:35 PM Page 58

Piping System Friction
58 The Basic Tools

TABLE 3.10 K Factors for Tees

Screwed-type, Flanged, Flanged,
Size, in branch flow line flow branch flow
1
00 ⁄ 2 2.40 — —
3
00 ⁄ 4 2.10 — —
01 1.90 0.27 1.00
1
01 ⁄ 4 1.70 0.25 0.94
1
01 ⁄ 2 1.60 0.23 0.90
02 1.40 0.20 0.83
1
02 ⁄ 2 1.30 0.18 0.80
03 1.20 0.17 0.75
04 1.10 0.15 0.70
06 — 0.12 0.61
08 — 0.10 0.58
10 — 0.09 0.54
12 — 0.09 0.52
14 — 0.08 0.51
16 — 0.08 0.47
18 0.07 0.44
20 — 0.07 0.42
NOTE: For screwed-type, line flow tees, a K factor of 0.90 is used for
all sizes.

TABLE 3.11 K Factors for Globe and Gate Valves (100 percent
open)
Globe valves Gate valves
Size, in Screwed Flanged Screwed Flanged
1
00 ⁄ 2 14.0 — 0.32 —
3
00 ⁄ 4 10.0 — 0.28 —
01 08.7 14.0 0.24 —
1
01 ⁄ 4 08.0 12.0 0.22 —
1
01 ⁄ 2 07.5 10.0 0.20 —
02 06.9 08.5 0.17 —
1
02 ⁄ 2 06.5 07.9 0.15 —
03 06.0 07.0 0.14 0.22
04 05.8 06.4 0.12 0.16
06 — 05.9 — 0.11
08 — 05.7 — 0.08
10 — 05.7 — 0.06
12 — 05.6 — 0.05
14 — 05.6 — 0.05
16 — 05.6 — 0.05
18 — 05.6 — 0.04
20 — 05.6 — 0.03

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