ASTM F1139-88(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1139 −88 (Reapproved 2019) An American National Standard
Standard Specification for
Steam Traps and Drains
This standard is issued under the fixed designation F1139; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope B16.3 Malleable Iron Threaded Fittings: Classes 150 and
1.1 This specification provides the minimum requirements
B16.4 Gray Iron Threaded Fittings: Classes 125 and 150
forthedesign,fabrication,pressurerating,marking,andtesting
B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through
of steam traps and drains.
NPS 24 Metric/Inch Standard
1.2 The values stated in inch-pound units are to be regarded
B16.11 Forged Fittings, Socket-Welding and Threaded
as standard. The values given in parentheses are mathematical
B16.15 Cast Copper Alloy Threaded Fittings: Classes 125
conversions to SI units that are provided for information only
and 250
and are not considered standard.
B16.18 Cast Copper Alloy Solder Joint Pressure Fittings
1.3 The following safety hazards caveat pertains only to the B16.22 Wrought Copper and Copper Alloy Solder-Joint
testmethodportionofthisspecification.Thisstandarddoesnot
Pressure Fittings
purport to address all of the safety concerns, if any, associated B16.24 Cast Copper Alloy Pipe Flanges, Flanged Fittings,
with its use. It is the responsibility of the user of this standard
and Valves: Classes 150, 300, 600, 900, 1500, and 2500
to establish appropriate safety, health, and environmental B16.34 Valves — Flanged, Threaded, and Welding End
practices and determine the applicability of regulatory limita-
B31.1 Power Piping
tions prior to use. 4
2.2 MSS Standards:
1.4 This international standard was developed in accor-
SP-25 Standard Marking System for Valves, Fittings,
dance with internationally recognized principles on standard-
Flanges, and Unions
ization established in the Decision on Principles for the
SP-51 150 lb Corrosion Resisting Cast Flanges and Flanged
Development of International Standards, Guides and Recom-
Fittings
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Terminology
2. Referenced Documents 3.1 Definitions of Terms Specific to This Standard:
3 3.1.1 coldcondensatecapacity(QC),n—maximummassof
2.1 ASME Standards:
condensate that the steam trap/drain can discharge in1hata
ANSI/ASME PTC 39.1 Condensate Removal Devices for
given pressure and temperature, the trap/drain being fully open
Steam Systems
(lb/h (kg/h)).
ASME Boiler and Pressure Vessel Code, Section VIII, Di-
vision I, Pressure Vessels 3.1.2 drain, n—device having no moving parts permitting
ASME Boiler and Pressure Vessel Code, Section IX, Weld- the discharge of fluids at a fixed or adjustable rate.
ing and Brazing Qualifications
3.1.3 hot condensate capacity (QH), n—maximum mass of
B16.1 Gray Iron Pipe Flanges and Flanged Fittings: Classes
condensate that a steam trap/drain can discharge in1hata
25, 125, and 250
given pressure and temperature (lb/h (kg/h)).
3.1.4 hydrostatic proof test (PTHP), n—test used in deter-
This specification is under the jurisdiction of ASTM Committee F25 on Ships
mining maximum allowable pressure (PMA) and maximum
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on 2 2
allowable temperature (TMA) (lb/in. (kg⁄mm )).
Machinery and Piping Systems.
Current edition approved Dec. 1, 2019. Published January 2020. Originally
3.1.5 maximum allowable pressure (PMA), n—maximum
approved in 1988. Last previous edition approved in 2015 as F1139 – 88 (2015).
pressure that the shell of the steam trap/drain can withstand
DOI: 10.1520/F1139-88R19.
2 2
permanently at a given temperature (lb/in. (kg⁄mm )).
This specification was developed from Fluid Controls Institute Standards, 69-1
Pressure Rating Standards for Steam Traps and 85-1 Standard Production Test for
Steam Traps.
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
www.asme.org. Industry (MSS), 127 Park St., NE, Vienna, VA22180-4602, http://www.mss-hq.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1139 − 88 (2019)
3.1.6 maximum allowable temperature (TMA), 4.1.3 Nominal pipe size.
n—maximum temperature to which the shell of the steam 4.1.4 Maximum operating pressure, psig (kPa). See 3.1.5.
trap/drain can be raised permanently (°F (°C)). 4.1.5 Capacity, lb/h (kg/h) (QC or QH). See 3.1.17 and
3.1.18.
3.1.7 maximum differential pressure (∆PMX), n—maximum
4.1.6 Connection type (that is, threaded, socket weld,
difference between operating pressure and operating back
2 2
flanged). See 5.2.1.
pressure (lb/in. (kg⁄mm )).
4.1.7 Materials—external and internal.
3.1.8 maximum operating back pressure (PMOB),
4.1.8 Type of trap/drain.
n—maximum permissible pressure measured at the outlet of
4.1.9 Maximum test pressure, psig (kPa). See 3.1.12.
the steam trap/drain allowing correct functioning (lb/
4.1.10 Maximumallowablepressure,psig(kPa).See3.1.14.
2 2
in. (kg⁄mm )).
4.1.11 Pressure differential (operating, maximum, or
3.1.9 maximum operating pressure (PMO), n—pressure for
minimum, or combination thereof).
which a steam trap/drain is rated by the manufacturer.
4.1.12 Notice for Acceptance Test—If the purchaser wishes
to witness the production tests, this shall be specified in the
3.1.9.1 Discussion—This pressure is normally a function of
order. See 8.2.
the limitations related to the internal mechanism of the steam
2 2
trap/drain (lb/in. (kg⁄mm )).
5. Materials and Manufacture
3.1.10 maximum test pressure (PTMX), n—maximum pres-
sure applied to the steam trap/drain under test including its
5.1 Materials:
2 2
internal mechanism (lb/in. (kg⁄mm )).
5.1.1 The pressure ratings established under this specifica-
tion are based upon materials of high quality produced under
3.1.11 minimum differential pressure (∆PMN), n—minimum
regular control of chemical and mechanical properties by a
difference between operating pressure and operating back
2 2
recognized process. The manufacturer shall be prepared to
pressure (lb/in. (kg⁄mm )).
certify that his product has been so produced and that the
3.1.12 operating back pressure (POB), n—pressure mea-
mechanical and chemical properties thereof, as proved by test
sured at the outlet of the steam trap/drain under operating
specimens and nondestructive testing or as documented by
2 2
conditions (lb/in. (kg⁄mm )).
certifications from the producer or recognized distributor of
3.1.13 operating differential pressure (∆P), n—difference
these materials, are at least equal to the requirements of the
betweentheoperatingpressureandtheoperatingbackpressure
appropriate specifications.
2 2
(lb/in. (kg⁄mm )).
5.1.2 Housings of traps/drains, and other parts or bolting, or
3.1.14 operating pressure (PO), n—pressure measured at combination thereof, used for pressure retention, shall be
the inlet of the steam trap/drain under operating conditions constructed of materials in accordance with ASME B31.1 or
2 2
(lb/in. (kg⁄mm )). Section VIII, Division 1 of the ASME Boiler and Pressure
Vessel Code.
3.1.15 operating temperature (TO), n—temperature mea-
5.1.3 Seals and parts, in addition to pressure containing
sured at the inlet of the steam trap/drain under operating
parts and bolting used for pressure retention, shall be of
conditions (°F (°C)).
materials suitable for the service.
3.1.16 performance characteristics tests, n—tests carried
5.1.4 Users are cautioned against applications with fluids
out to determine the operational characteristics of a particular
that may react chemically with any materials used in these
design of steam trap/drain.
products.
3.1.17 production tests, n—tests carried out by the manu-
5.1.5 For materials not having values of allowable stress
facturertoconfirmthatthesteamtrap/drainfunctionscorrectly.
tabulated in Section VIII, Division 1, allowable stresses shall
be determined in accordance with the procedures outlined in
3.1.17.1 Discussion—These tests may be witnessed by the
Subsection C and Appendix P of Section VIII of the ASME
purchaser or his representative. In this case, these tests are
Boiler and Pressure Vessel Code. Where it can be shown that
referred to as acceptance tests.
the values of allowable stress listed for a particular material in
3.1.18 steam trap, n—self-contained valve that automati-
one product form (because of similar chemistry, mechanical
cally drains the condensate from a steam containing enclosure
properties, directional properties, heat treatment, and so forth)
while remaining tight to live steam, or if necessary, allowing
are applicable to the same material in an unlisted product form,
steam to flow at a controlled or adjusted rate.
the listed values of allowable stress may be used.
3.1.18.1 Discussion—Most steam traps will also pass non-
5.2 Manufacture:
condensable gases while remaining tight to live steam.
5.2.1 Steam traps/drains with end fittings in compliance
with the following standards may be used within the pressure-
4. Ordering Information
temperature ranges permitted by the applicable standard pro-
4.1 Ordersforproductsunderthisspecificationshallinclude vided the trap/drain housing (less end fittings) is satisfactory
the following information as applicable:
for these conditions:
4.1.1 Performance characteristics required—See Section 7. 5.2.1.1 ASME B16.1,
4.1.2 Certification of performance characteristics if re- 5.2.1.2 ASME B16.3,
quired. See Section 7. 5.2.1.3 ASME B16.4,
F1139 − 88 (2019)
5.2.1.4 ASME B16.5, 7. Performance Characteristics
5.2.1.5 ASME B16.11,
7.1 Amanufacturer may describe the operation of a particu-
5.2.1.6 ASME B16.15,
lartypeofsteamtrapordrainbyreferringtooneormoreofthe
5.2.1.7 ASME B16.18,
performance characteristics. When this is done, the associated
5.2.1.8 ASME B16.22,
tests described in 8.6 must be performed on a representative
5.2.1.9 ASME B16.24,
production sample. A brief explanation of the derivation of
5.2.1.10 ASME B16.34, and
each characteristic is given as follows. Further details on test
5.2.1.11 MSS SP-51.
methods are specified in Section 8.
5.2.2 Weld design details, welding, and nondestructive test-
7.1.1 Certification of performance characteristics shall be
ing shall be in accordance with Section VIII, Division 1, of the
available if required by the purchaser (see 4.1.2).
ASME Boiler and Pressure Vessel Code. Welders and weld
7.2 Minimum Operating Pressure—The steam trap shall be
procedures shall be qualified in accordance with Section IX of
the ASME Boiler and Pressure Vessel Code. tested to determine the minimum pressure (atmospheric or
above) at which correct opening and closing will occur.
6. Requirements
7.3 Maximum Operating Pressure (PMO)—The steam trap
6.1 Pressure Rating and Design: shall be tested to determine the maximum pressure at which
6.1.1 The maximum allowable pressure (PMA) and maxi- correct opening and closing will occur.
mum allowable temperature (TMA) rating for steam traps/
7.4 Maximum Operating Back Pressure (PMOB)—The
drains conform
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