ASTM F1139-88(2010)
(Specification)Standard Specification for Steam Traps and Drains
Standard Specification for Steam Traps and Drains
ABSTRACT
This specification provides the minimum requirements for the design, fabrication, pressure rating, marking, and testing of steam traps and drains. Hydrostatic proof test, hydrostatic production shell test, steam production shell test, air production shell test, operational check steam test, and performance characteristics test shall be performed to meet the requirements prescribed.
SCOPE
1.1 This specification provides the minimum requirements for the design, fabrication, pressure rating, marking, and testing of steam traps and drains.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following safety hazards caveat pertains only to the test method portion of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F1139 −88(Reapproved 2010) 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 2.2 MSS Standards:
2 SP-25 Standard Marking System for Valves, Fittings,
1.1 This specification provides the minimum requirements
Flanges, and Unions
forthedesign,fabrication,pressurerating,marking,andtesting
SP-51 150 lb Corrosion Resisting Cast Flanges and Flanged
of steam traps and drains.
Fittings
1.2 The values stated in inch-pound units are to be regarded
2.3 ASME Standards:
as the standard. The values given in parentheses are for
ANSI/ASME PTC 39.1 Condensate Removal Devices for
information only.
Steam Systems
1.3 The following safety hazards caveat pertains only to the
ASME Boiler and Pressure Vessel Code, Section VIII,
testmethodportionofthisspecification.Thisstandarddoesnot
Division I, Pressure Vessels
purport to address all of the safety concerns, if any, associated
ASME Boiler and Pressure Vessel Code, Section IX, W el-
with its use. It is the responsibility of the user of this standard
ding and Brazing Qualifications
to establish appropriate safety and health practices and
3. Definitions of Terms Specific to This Standard
determine the applicability of regulatory limitations prior to
use.
3.1 cold condensate capacity (QC)—maximum mass of
condensate that the steam trap/drain can discharge in1hata
2. Referenced Documents
given pressure and temperature, the trap/drain being fully open
2.1 ANSI Standards:
(lb/h (kg/h)).
B16.1 Cast Iron Pipe Flanges and Flanged Fittings
3.2 drain—device having no moving parts permitting the
B16.3 Malleable-Iron Screwed Fittings
discharge of fluids at a fixed or adjustable rate.
B16.4 Cast-Iron Screwed Fittings
3.3 hot condensate capacity (QH)—maximum mass of con-
B16.5 Steel Pipe Flanges and Flanged Fittings
densate that a steam trap/drain can discharge in1hata given
B16.11 Forged Steel Fittings Socket-Welding and Threaded
pressure and temperature (lb/h (kg/h)).
B16.15 Cast Bronze Screwed Fittings
B16.18 Cast Bronze Solder-Joint Pressure Fittings
3.4 hydrostatic proof test (PTHP)—test used in determining
B16.22 Wrought Copper and Bronze Solder-Joint Pressure
maximum allowable pressure (PMA) and maximum allowable
2 2
Fittings
temperature (TMA) (lb/in. (kg/mm )).
B16.24 Bronze Flanges and Flanged Fittings
3.5 maximum allowable pressure (PMA)—maximum pres-
B16.34 Steel Valves, Flanged and Buttweld Ends
sure that the shell of the steam trap/drain can withstand
B31.1 Power Piping
2 2
permanently at a given temperature (lb/in. (kg/mm )).
3.6 maximum allowable temperature (TMA)—maximum
This specification is under the jurisdiction of ASTM Committee F25 on Ships
temperature to which the shell of the steam trap/drain can be
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
raised permanently (°F (°C)).
Machinery and Piping Systems.
Current edition approved March 1, 2010. Published April 2010. Originally
approved in 1988. Last previous edition approved in 2004 as F1139 – 88(2004).
DOI: 10.1520/F1139-88R10. AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
This specification was developed from Fluid Controls Institute Standards, 69-1 Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
Pressure Rating Standards for Steam Traps and 85-1 Standard Production Test for hq.com.
Steam Traps. Available from American Society of Mechanical Engineers (ASME), ASME
Available from American National Standards Institute (ANSI), 25 W. 43rd St., International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
4th Floor, New York, NY 10036, http://www.ansi.org. www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1139−88 (2010)
3.7 maximum differential pressure (∆PMX)—maximum dif- 4.1.7 Materials—external and internal.
ference between operating pressure and operating back pres- 4.1.8 Type of trap/drain.
2 2
sure (lb/in. (kg/mm )). 4.1.9 Maximum test pressure, psig (kPa). See 3.12.
4.1.10 Maximum allowable pressure, psig (kPa). See 3.14.
3.8 maximum operating back pressure (PMOB)—maximum
4.1.11 Pressure differential (operating, maximum, or mini-
permissible pressure measured at the outlet of the steam
2 2
mum, or combination thereof).
trap/drain allowing correct functioning (lb/in. (kg/mm )).
4.1.12 Notice for Acceptance Test—If the purchaser wishes
3.9 maximum operating pressure (PMO)—pressure for
to witness the production tests, this shall be specified in the
which a steam trap/drain is rated by the manufacturer.
order. See 8.2.
3.9.1 Discussion—This pressure is normally a function of
the limitations related to the internal mechanism of the steam
5. Materials and Manufacture
2 2
trap/drain (lb/in. (kg/mm )).
5.1 Materials:
3.10 maximum test pressure (PTMX)—maximum pressure
5.1.1 The pressure ratings established under this specifica-
applied to the steam trap/drain under test including its internal
tion are based upon materials of high quality produced under
2 2
mechanism (lb/in. (kg/mm )).
regular control of chemical and mechanical properties by a
3.11 minimumdifferentialpressure(∆PMN)—minimumdif-
recognized process. The manufacturer shall be prepared to
ference between operating pressure and operating back pres-
certify that his product has been so produced and that the
2 2
sure (lb/in. (kg/mm )). mechanical and chemical properties thereof, as proved by test
specimens and nondestructive testing or as documented by
3.12 operating back pressure (POB)—pressure measured at
certifications from the producer or recognized distributor of
the outlet of the steam trap/drain under operating conditions
2 2
these materials, are at least equal to the requirements of the
(lb/in. (kg/mm )).
appropriate specifications.
3.13 operating differential pressure (∆P)—difference be-
5.1.2 Housings of traps/drains, and other parts or bolting, or
tween the operating pressure and the operating back pressure
combination thereof, used for pressure retention, shall be
2 2
(lb/in. (kg/mm )).
constructed of materials in accordance with ANSI/ASME
3.14 operating pressure (PO)—pressure measured at the B31.1 or Section VIII, Division 1 of the ASME Boiler and
inlet of the steam trap/drain under operating conditions (lb/ Pressure Vessel Code.
2 2
in. (kg/mm )). 5.1.3 Seals and parts, in addition to pressure containing
parts and bolting used for pressure retention, shall be of
3.15 operating temperature (TO)—temperature measured at
materials suitable for the service.
the inlet of the steam trap/drain under operating conditions (°F
5.1.4 Users are cautioned against applications with fluids
(°C)).
that may react chemically with any materials used in these
3.16 performance characteristics tests—tests carried out to
products.
determine the operational characteristics of a particular design
5.1.5 For materials not having values of allowable stress
of steam trap/drain.
tabulated in Section VIII, Division 1, allowable stresses shall
3.17 production tests—tests carried out by the manufacturer be determined in accordance with the procedures outlined in
to confirm that the steam trap/drain functions correctly. Subsection C and Appendix P of Section VIII of the ASME
3.17.1 Discussion—These tests may be witnessed by the Boiler and Pressure Vessel Code. Where it can be shown that
purchaser or his representative. In this case, these tests are the values of allowable stress listed for a particular material in
referred to as acceptance tests. one product form (because of similar chemistry, mechanical
properties, directional properties, heat treatment, and so forth)
3.18 steam trap—self-contained valve that automatically
are applicable to the same material in an unlisted product form,
drains the condensate from a steam containing enclosure while
the listed values of allowable stress may be used.
remainingtighttolivesteam,orifnecessary,allowingsteamto
flow at a controlled or adjusted rate. 5.2 Manufacture:
3.18.1 Discussion—Most steam traps will also pass noncon- 5.2.1 Steam traps/drains with end fittings in compliance
densable gases while remaining tight to live steam. with the following standards may be used within the pressure-
temperature ranges permitted by the applicable standard pro-
4. Ordering Information
vided the trap/drain housing (less end fittings) is satisfactory
4.1 Ordersforproductsunderthisspecificationshallinclude for these conditions:
the following information as applicable: 5.2.1.1 ANSI B16.1,
4.1.1 Performance characteristics required—See Section 7. 5.2.1.2 ANSI B16.3,
4.1.2 Certification of performance characteristics if re- 5.2.1.3 ANSI B16.4,
quired. See Section 7. 5.2.1.4 ANSI B16.5,
4.1.3 Nominal pipe size. 5.2.1.5 ANSI B16.11,
4.1.4 Maximum operating pressure, psig (kPa). See 3.5. 5.2.1.6 ANSI B16.15,
4.1.5 Capacity, lb/h (kg/h) (QC or QH). See 3.17 and 3.18. 5.2.1.7 ANSI B16.18,
4.1.6 Connection type (that is, threaded, socket weld, 5.2.1.8 ANSI B16.22,
flanged). See 5.2.1. 5.2.1.9 ANSI B16.24,
F1139−88 (2010)
5.2.1.10 ANSI B16.34, and production sample. A brief explanation of the derivation of
5.2.1.11 MSS SP-51. each characteristic is given as follows. Further details on test
5.2.2 Weld design details, welding, and nondestructive test- methods are specified in Section 8.
ing shall be in accordance with Section VIII, Division 1, of the 7.1.1 Certification of performance characteristics shall be
ASME Boiler and Pressure Vessel Code. Welders and weld
available if required by the purchaser (see 4.1.2).
procedures shall be qualified in accordance with Section IX of
7.2 Minimum Operating Pressure—The steam trap shall be
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 conforming to this specification shall be established by
steam trap shall be tested to determine the maximum pressure
at least one of the following methods:
permissible at the outlet of the device that allows correct
6.1.1.1 Proof test in accordance with the requirements
functioning.
prescribed in paragraph UG-101 of Section VIII of the ASME
Boiler and Pressure Vessel Code. If burst-type tests as outlined
7.5 Air Venting Capability—The steam trap/drain shall be
in UG-101(m) are used, it is not necessary to rupture the
tested to determine its ability to discharge air and other
component. In this case, the value of “B’’ to be used in
noncondensable gases.
determining the maximum allowable pressure shall be the
7.6 Operating Temperature (TO)—The steam trap/drain
maximum pressure to which the component was subjected
shallbetestedtodeterminethetemperatureatwhichthedevice
without rupture. Safety of personnel shall be given serious
operates and, in particular, the temperature at which it passes
consideration when conducting hydrostatic tests. Components
its specified capacity.
that have been subjected to a hydrostatic proof test shall not be
offered for sale. 7.7 Condensate Capacity (QH or QC)—The steam trap/
6.1.1.2 Design calculations in accordance with the require- drain shall be flow tested to determine its condensate capacity
ments prescribed in Section VIII, Division 1 of the ASME
throughout its operating pressure range.
Boiler and Pressure Vessel Code.
7.8 Live Steam Loss—The steam trap shall be tested to
6.1.1.3 Hydrostatic proof test of a representative production
determine the amount of live steam lost through the trap.
sample to establish the maximum allowable pressure (PMA)
and maximum allowable temperature (TMA) rating as de-
8. Test Methods
scribed in 8.1.
8.1 Hydrostatic Proof Test—Establish the maximum allow-
6.1.1.4 Extensive and successful performance experience
able pressure (PMA) and temperature (TMA) rating using a
under comparable service conditions with similarly propor-
hydrostatic proof test of a representative production sample,
tioned components of the same or similar material may be used
chosen in accordance with 6.1.1.3 and perform as follows:
as a basis for rating provided all other provisions of this
specification are met.
PTHP~f!
PMA 5
6.2 Production Tests:
6.2.1 The manufacturer shall production test every steam
specified minimum tensile strength
trap/drainasdescribedinSection8byoneofthefollowingtest
methods: average tensile of test specimens of pressure retaining components
6.2.1.1 Hydrostatic—See 8.2.
stress value at design temperature
6.2.1.2 Steam—See 8.3.
stress value at test temperature
6.2.1.3 Air—See 8.4.
8.1.1 Determine stress values in accordance with Section
6.2.2 Samples of the traps/drains shall be visually examined
VIII, Division 1 of theASME Boiler and PressureVessel Code
and dimensionally checked to ensure that the traps/drains
or ANSI B31.1.
correspond to this specification and are marked in accordance
8.1.2 Casting quality factor (f) shall be 1.0 for wrought
with Section 9.
materials and 0.8 for castings.
6.2.3 Sample steam traps/drains shall be given an opera-
8.1.3 Gasket leakage during test does not constitute failure
tional check steam test to ensure that they open to discharge
unless a result of rupture of a pressure containing part.
condensateandclosesatisfactorilyinaccordancewith8.5.This
8.1.4 Do not exceed water temperature of 125°F (50°C)
test does not apply to labyrinth (orifice) steam traps/drains.
during the test.
7. Performance Characteristics 8.1.5 Retain certification of the hydrostatic proof test by the
manufacturer and make available upon request.
7.1 Amanufacturer may describe the operation of a particu-
lartypeofsteamtrapordrainbyreferringtooneormoreofthe 8.2 Hydrostatic Production Shell Test—Give steam traps/
performance characteristics. When this is done, the associated drains a hydrostatic shell test at a pressure of 1.5 times its
tests described in 8.6 must be performed on a representative maximum allowable pressure rating at 68°F (20°C).
F1139−88 (2010)
8.2.1 Do not exceed w
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