UFC 4-150-02
12 May 2003
CHAPTER 3
ACTIVE AND REPAIR BERTHING
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STEAM SYSTEMS. Provide steam service at 1034 kPa (150 psi)
(saturated) along all piers and other waterfront structures used for active berthing and
ship repair, and at the perimeter of graving drydocks. Provide 862 kPa (125 psi) only if
approved by the Activity and the cognizant NAVFAC EFD/EFA OR USACE DISTRICT.
Laundries on many vessels use the highest pressure at 689 kPa (100 psi). Provisions
for returning condensate from ships will not be required except in special cases, and as
directed by the cognizant NAVFAC EFD/EFA OR USACE DISTRICT. Newer ships do
not require steam services. Contact NAVFAC EICO or USACE to waive the mandatory
steam requirement.
3-1.1
Demands. Steam requirements for selected ship classes are given in
SCDB.
Generally, steam demand is considerably less in port than at sea. Loads
must be selected for the appropriate local climate as indicated in Table 3-1. For ships
not included in SCDB, use data from a similar ship, or obtain the expected demand from
NAVFAC EICO or USACE. For graving drydocks, refer to UFC 4-213-10.
3-1.2
Size of Piping. Size the piping for single berths to meet the demands
indicated. Include nested ships that are indicated on berthing plans. For multiple
berthing, use diversity factors determined from Table 3-1. Branch steam lines from
main to outlet locations should be sized for the full demands and should be no smaller
than the outlet riser pipe. For ships that require two connection locations, assume 75
percent of the demand for sizing each branch. Refer to paragraph 3-1.5 for minimum
outlet and riser sizes. Determination of pipe sizes should be in accordance with MIL-
HDBK-1003/8A, Exterior Distribution of Steam, High Temperature Water, Chilled Water,
Natural Gas, and Compressed Air.
3-1.3
Piping System Design Criteria. For steam piping and condensate return
piping design requirements, refer to MIL-HDBK-1003/8A, subject to the following
exceptions and additions. It is noted that steam piping on piers and wharves is often
specified to be ASTM A 53 steel.
3-1.3.1
Pitch. For steam piping on or under a pier, the pitch of piping required by
MIL-HDBK-1003/8A, may be impractical due to elevation limitations or structural
interference. In such cases, the designer must compensate by proper sizing of piping
and by provision for adequate condensate removal. Tidal submergence of piping should
be avoided by whatever means are practical.
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