Pipework - Marstair CKC 15 1/50 Technical Manual

Supplied male flare connections (sizes in inches)
Model
Size
Expansion 3/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
Suction
* Brazed connections
MAXIMUM PIPE RUNS
Liquid lines (CD3 on cellar coolers)
45m maximum (CKC 15-20 = 20M) including 20m lift.
Expansion line with expansion device fitted on CKC liquid service valve.
80m maximum (CKC 15-20 = 50M) including 20m lift.
There will be no significant loss of capacity for extended pipe runs provided pipes are correctly sized and the
correct restrictor is fitted.
CALCULATING EQUIVALENT LENGTHS
The effects of bends and fittings must be taken into account. The table on top of page 5 covers the fittings
most likely to be encountered in installation.
ACTUAL PIPE LENGTH + TOTAL EQUIVALENT FITTING LENGTHS = TOTAL EQUIVALENT LENGTH
FITTING LOSSES in equivalent straight lengths of pipes (m)
FITTING
45° Bend
90° Bend R/d = 1
90° Bend R/d = 2
180° Bend C/d = 1
180° Bend C/d = 2
90° Elbow
R = Radius of bend
Pipe sizes are based on:
Minimum of 2.5 m/s (500 fpm) suction gas velocity for horizontal or downflow.
Minimum of 5.0 m/s (1000 fpm) suction gas velocity for upflow.
Maximum of 20.0 m/s (4000 fpm) suction gas.
Where vertical risers exceed 3m, oil traps must be formed in the pipe. This will help ensure that oil returns to
the compressor. Typically fit an oil trap every 3m with a trap at the bottom of the riser.
GOOD PRACTICE
• Keep pipe runs as short as possible.
• Avoid sharp bends
• Fully insulate both suction and expansion including mechanical connections
• Try to avoid running pipes through hot areas.
15 20 30 40 50 60 80 90 100 130 150 165 180 200
3/8 3/8 1/2 1/2 1/2 5/8 5/8 5/8 3/4 3/4 3/4 3/4 7/8* 7/8*
PIPE SIZE (outside diameter in inches)
⅜ ½ ⅝
0.12 0.15 0.18
0.37 0.43 0.49
0.24 0.27 0.30
0.73 0.91 1.10
0.46 0.55 0.64
0.67 0.85 1.04
d = Diameter of tube

PIPEWORK

CKC
¾ ⅞
0.21 0.24
0.55 0.61
0.37 0.43
1.28 1.46
0.76 0.85
1.25 1.46
C = Centres of bend
9
INSTALLERS TABLE
Nº OF
⅛ FITTINGS
1
0.30
0.79
0.52
1.83
1.07
1.89
TOTAL =
EFFECTIVE
LENGTH
55008418-03