MIL-HDBK-1003/8A
Change 2, 30 December 1991
method of expelling gasses during warmup is required. To this end, all
strainers should have blowdown valves which will also be used for controlled
warmup.
Table 13
Condensate Loads from Aboveground Heat Distribution Piping
(Pounds Per Hour Per 100 Linear Feet)
_________________________________________________________
STEAM
STEAM PIPE SIZE (INCHES, DIAMETER)
PRESSURE
(psig)
2
4
6
8
10
12
_________________________________________________________
10
6
12
16
20
24
30
30
10
18
25
32
40
46
60
13
22
32
41
51
58
125
17
30
44
55
68
80
300
25
46
64
83
203
122
600
37
68
95
124
154
182
_________________________________________________________
d) Pitch discharge piping down a minimum of 3 inches (76 mm) per
100 feet (30.5 m) to the collection tank. This applies where a condensate
pump set or reliance upon a gravity return is used. An exception to this
"rule-of-thumb" exists when there is sufficient pressure in a steam line to
overcome its friction and static head, whether the line is level, or pitched
up. Trap discharge line shall not be RTRP pipe nor shall the trap discharge
connect to an RTRP pipe by direction connection. Install pipe through a
condensate cooling device as depicted in Figure 10. This system provides a
cooling tank and diffuser, plus a temperature relief valve to limit the
temperature of condensate returned to a pumped RTRP condensate line to less
than 250 degrees F (121 degrees C).
e) If it is not justifiable to return drips to a condensate system,
they may be drained as waste to a sewer. If the temperature exceeds sewer
limitations, condensate must be cooled in a sump or by other means. Disposal
of condensate from steam systems along the waterfront or under piers warrants
special consideration to be determined on a case-by-case basis.
4.2.7
Pipe Anchors.
Ensure anchors comply with the following criteria:
4.2.7.1
Location. Locate anchors for non-pre-engineered/prefabricated
systems at takeoffs from mains and other necessary points to contain pipeline
expansion. If possible, locate anchors in buildings, piers, tunnels, and
manholes with suitable access.
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