ASTM F986-86(1997)

Standard Specification for Suction Strainer Boxes

SCOPE
1.1 This specification covers the design, materials, and construction of strainer boxes for use in ships' bilges and other such tank locations that require trash protection for suction pipes and pumps.  
1.2 This specification covers pipe sizes from NPS 11/2 through NPS 16 (see Note).  
Note-The dimensionless designator NPS (nominal pipe size) has been substituted in this specification for such traditional terms as "nominal diameter," "size," and "nominal size."  
1.3 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 31-Dec-1996
• ICS: 47.020.30 - Piping systems
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Replaced By: ASTM F986-86(2004) - Standard Specification for Suction Strainer Boxes
• Effective Date: 01-May-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: F 986 – 86 (Reapproved 1997)
Standard Specification for
Suction Strainer Boxes
This standard is issued under the fixed designation F 986; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 Type 2—Strainer boxes with the pipe clamp off center
in the top of the strainer box (see Fig. 2).
1.1 This specification covers the design, materials, and
construction of strainer boxes for use in ships’ bilges and other
4. Ordering Information
such tank locations that require trash protection for suction
4.1 Ordering information required is as follows.
pipes and pumps.
4.1.1 ASTM specification and year of issue.
1.2 This specification covers pipe sizes from NPS 1½
4.1.2 Type.
through NPS 16 (see Note 1).
4.1.3 Size (suction pipe NPS).
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
4.1.4 Dimensions G and H (Type 2 only).
been substituted in this specification for such traditional terms as “nominal
4.1.5 Number of each type and size.
diameter,” “size,” and “nominal size.”
5. Materials and Manufacture
1.3 The values stated in inch-pound units are to be regarded
as the standard.
5.1 For information on materials, see Table 1.
5.2 Welding shall be in accordance with AWS D1.3.
2. Referenced Documents
5.3 Perforated sheet metal shall have ⁄8-in. diameter holes
2.1 ASTM Standards:
on staggered ½-in. centers, 51 % open area.
A 36/A36M Specification for Carbon Structural Steel
6. Dimensions and Tolerances
A 123/A 123M Specification for Zinc (Hot-Dip Galva-
nized) Coatings on Iron and Steel Products
6.1 Tolerance—6 ⁄16 in.
F 593 Specification for Stainless Steel Bolts, Hex Cap
6.2 Strainer Box Dimensions:
Screws, and Studs
6.2.1 Type 1—See Table 2.
F 594 Specification for Stainless Steel Nuts
6.2.2 Type 2—See Table 3.
F 708 Practice for Design and Installation of Rigid Pipe
7. Workmanship, Finish, and Appearance
Hangers
2.2 American Welding Society Standard:
7.1 Strainer boxes shall be hot galvanized in accordance
AWS D1.3 Structural Welding Code—Sheet Steel
with Specification A 123/A 123M after fabrication. The galva-
nizing shall be a minimum of 2 mils thick.
3. Classification
7.2 Strainer boxes shall be free of defects, burrs, and sharp
3.1 This specification covers two types of strainer boxes.
edges.
3.1.1 Type 1—Strainer boxes with pipe clamp centered on
8. Installation
the top of the strainer box (see Fig. 1).
8.1 Strainer boxes are normally installed on suction pipes in
ballast and bilge spaces.
This specification is under the jurisdiction of ASTM Committee F25 on Ships 8.2 Minimum suction pipe or tank bottom clearances are
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
indicated in Column “F” in Table 2 and Table 3. Dimension
Machinery and Piping Systems.
callout is based on ½ 3 the tailpipe nominal pipe size.
Current edition approved March 27, 1986. Published May 1986.
8.3 Tank structure and sloping bottom structure may ob-
Annual Book of ASTM Standards, Vol 01.04.
Annual Book of ASTM Standards, Vol 01.06.
scure the above clearance down to the limit of the resulting
Annual Book of ASTM Standards, Vol 15.08.
periphery clear area, being 1.5 3 the inside diameter of the
Annual Book of ASTM Standards, Vol 01.07.
6 tailpipe. Structure outside the limit of ½ the pipe NPS need not
Available from American Welding Society, 550 NW LeJeune Rd., Miami, FL
33126. be considered as obstructing flow.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 986 – 86 (1997)
NOTE 1—Tab location to suit perforated holes.
FIG. 1 Type 1—Elevation Strainer Box
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