ASHRAE Journal - June 2023 - 19
TECHNICAL FEATURE
values corresponding to higher steam supply pressures.
Occasionally, dedicated common return piping is
provided for each steam supply pressure level in a
system. However, segregation of these piping systems
is not always required.4 Steam traps discharging from
different upstream pressures may be combined if (1)
each steam trap is selected to provide a similar outlet
pressure, (2) steam supply pressure is suffi ciently
greater than condensate return main pressure and (3)
the common return is sized to convey the combined
rate of fl ash steam from connected steam traps.
Pumped Condensate Return Piping
Pumps are used to transport liquid condensate back
to the plant when adequate back pressure is not continuously
available. Pumped condensate return piping
is fi lled with liquid (fl ooded). Fluid velocities ranging
from 3.0 to 7.0 fps (0.9 to 2.1 m/s) and pressure drops
between 1.0 and 3.0 ft wg/100 ft (98 and 294 Pa/m) are
used for sizing. Condensate pump fl ow rates can be
two to fi ve times greater than the incoming condensate
load; therefore, it is essential to size pumped condensate
piping using rated pump fl ow, not incoming condensate
load.
Common return mains receiving only liquid condensate
may be vented and drained by gravity after
being pumped to a high point. In such cases, piping is
sized for open channel fl ow in accordance with ASHRAE
Handbook-Fundamentals. However, additional lift and
back pressure are frequently required in large piping
networks, often precluding the use of this method in
industrial steam systems.
Steam Vent Piping
Atmospheric steam vents are provided for condensate
receivers, fl ash tanks, surge tanks and boiler
feed tanks to prevent an accumulation of pressure
by relieving incidental fl ash steam. Properly sized
vents will limit fl ash steam velocity and pressure drop
to 3,000 fpm (15 m/s) and 0.125 psi/100 ft (28 Pa/m),
respectively. Vent piping should be no smaller than
the associated vessel's vent connection size. Horizontal
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J U N E 2 0 2 3 ashrae .o rg ASHRAE JOURNAL
19
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ASHRAE Journal - June 2023
Table of Contents for the Digital Edition of ASHRAE Journal - June 2023
Contents
ASHRAE Journal - June 2023 - Intro
ASHRAE Journal - June 2023 - Cover1
ASHRAE Journal - June 2023 - Cover2
ASHRAE Journal - June 2023 - 1
ASHRAE Journal - June 2023 - Contents
ASHRAE Journal - June 2023 - 3
ASHRAE Journal - June 2023 - 4
ASHRAE Journal - June 2023 - 5
ASHRAE Journal - June 2023 - 6
ASHRAE Journal - June 2023 - 7
ASHRAE Journal - June 2023 - 8
ASHRAE Journal - June 2023 - 9
ASHRAE Journal - June 2023 - 10
ASHRAE Journal - June 2023 - 11
ASHRAE Journal - June 2023 - 12
ASHRAE Journal - June 2023 - 13
ASHRAE Journal - June 2023 - 14
ASHRAE Journal - June 2023 - 15
ASHRAE Journal - June 2023 - 16
ASHRAE Journal - June 2023 - 17
ASHRAE Journal - June 2023 - 18
ASHRAE Journal - June 2023 - 19
ASHRAE Journal - June 2023 - 20
ASHRAE Journal - June 2023 - 21
ASHRAE Journal - June 2023 - 22
ASHRAE Journal - June 2023 - 23
ASHRAE Journal - June 2023 - 24
ASHRAE Journal - June 2023 - 25
ASHRAE Journal - June 2023 - 26
ASHRAE Journal - June 2023 - 27
ASHRAE Journal - June 2023 - 28
ASHRAE Journal - June 2023 - 29
ASHRAE Journal - June 2023 - 30
ASHRAE Journal - June 2023 - 31
ASHRAE Journal - June 2023 - 32
ASHRAE Journal - June 2023 - 33
ASHRAE Journal - June 2023 - 34
ASHRAE Journal - June 2023 - 35
ASHRAE Journal - June 2023 - 36
ASHRAE Journal - June 2023 - 37
ASHRAE Journal - June 2023 - 38
ASHRAE Journal - June 2023 - 39
ASHRAE Journal - June 2023 - 40
ASHRAE Journal - June 2023 - 41
ASHRAE Journal - June 2023 - 42
ASHRAE Journal - June 2023 - 43
ASHRAE Journal - June 2023 - 44
ASHRAE Journal - June 2023 - 45
ASHRAE Journal - June 2023 - 46
ASHRAE Journal - June 2023 - 47
ASHRAE Journal - June 2023 - 48
ASHRAE Journal - June 2023 - 49
ASHRAE Journal - June 2023 - 50
ASHRAE Journal - June 2023 - 51
ASHRAE Journal - June 2023 - 52
ASHRAE Journal - June 2023 - 53
ASHRAE Journal - June 2023 - 54
ASHRAE Journal - June 2023 - 55
ASHRAE Journal - June 2023 - 56
ASHRAE Journal - June 2023 - 57
ASHRAE Journal - June 2023 - 58
ASHRAE Journal - June 2023 - 59
ASHRAE Journal - June 2023 - 60
ASHRAE Journal - June 2023 - 61
ASHRAE Journal - June 2023 - 62
ASHRAE Journal - June 2023 - 63
ASHRAE Journal - June 2023 - 64
ASHRAE Journal - June 2023 - 65
ASHRAE Journal - June 2023 - 66
ASHRAE Journal - June 2023 - 67
ASHRAE Journal - June 2023 - 68
ASHRAE Journal - June 2023 - 69
ASHRAE Journal - June 2023 - 70
ASHRAE Journal - June 2023 - 71
ASHRAE Journal - June 2023 - 72
ASHRAE Journal - June 2023 - Cover3
ASHRAE Journal - June 2023 - Cover4
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