Procedure For Calculating The Total Equivalent Length Of Tubing - Rheem H2AC Installation Instructions Manual

EQUIVALENT LENGTH OF TUBING
List all piping components from the storage tank to the H
List all piping components from the storage tank to the hybrid unit and
and back again. The equivalent length of straight tubing is the same as the
back again. The equivalent length of straight tubing is the same as the
actual length. The equivalent length of fittings are obtained from the table
actual length. The equivalent length of fittings are obtained from the table
below. Sum all of the individual component lengths to find the Total
below. Sum all of the individual component lengths to find the Total
Equivalent Length.
Equivalent Length.
*Pressure Loss in Fittings and Valves Expressed as Equivalent
Length of Tube, feet
Nominal or Standard Size, in
Standard 90 Elbow
Standard 45 Elbow
Fittings 90 Tee - Side Branch
90 Tee - Straight Run
Valves
No.Inlet
1 side branch Tee
2 straight tubing
3 Check valve
4 straight tubing
5 straight run Tee
6 straight tubing
7 Ball valve
8 straight tubing
9 90 elbow
10 straight tubing
11 coupling
12 straight tubing
13 1-1/2" MPT adapter
14 Ball Isolation valve
1-1/2" MPT adapter
15
16 straight tubing
17 90 elbow - fitting
Total Equivalent length
*NOTES: For threaded fittings, double the allowances shown in the table.
Data condensed from Table 7 of the Copper Development Organization.
Allowances are for streamlined soldered fittings and recessed threaded fittings.
The equivalent lengths presented above are based upon a C factor of 150 in the Hazen-Williams
friction loss formula. The lengths shown are rounded to the nearest half foot.
In a closed system application the static (elevation) head is ignored. Only the pipe friction is used to calculate pressure drop.
26
Coupling
Ball
Gate
Btfly
Check
AC rooftop unit
2
1-1/2" 2"
4 5.5
1.5 2
7 9
0.5 0.5
0.5 0.5
0.5 0.5
0.5
7.5
6.5 9
EQUIV.
Length
(ft.)
No.Outlet
7.0 18 straight tubing
1.0 19 90 elbow
6.5 20 straight tubing
0.5 21 1-1/2" MPT adapter
0.5 22 Ball Isolation valve
1.5 23 1-1/2" MPT adapter
0.5 24 straight tubing
5.0 25 coupling
4.0 26 straight tubing
20.0 27 90 elbow
0.5 28 straight tubing
20.0 29 Ball valve
1.0 30 straight tubing
0.5 31 straight run Tee
1.0 32 straight tubing
0.5 33 Check valve
4.0 34 straight tubing
35 90 elbow
74.0
144.6 (ft.)
EQUIV.
Length
(ft.)
1
4.0
0.5
1
0.5
1.0
20.0
0.5
19.6
4.0
4.0
0.5
1.5
0.5
0.5
6.5
1.0
4.0
70.6