ASTM F1139-88(2015)
(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 specification2 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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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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Designation:F1139 −88 (Reapproved 2015) 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:
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 5
2.3 ASME Standards:
as standard. The values given in parentheses are mathematical
ANSI/ASME PTC 39.1 Condensate Removal Devices for
conversions to SI units that are provided for information only
Steam Systems
and are not considered standard.
ASME Boiler and Pressure Vessel Code, Section VIII Divi-
1.3 The following safety hazards caveat pertains only to the
sion I, Pressure Vessels
testmethodportionofthisspecification.Thisstandarddoesnot
ASME Boiler and Pressure Vessel Code, Section IX, W el-
purport to address all of the safety concerns, if any, associated
ding and Brazing Qualifications
with its use. It is the responsibility of the user of this standard
3. Terminology
to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to
3.1 Definitions of Terms Specific to This Standard:
use.
3.1.1 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
(lb/h (kg/h)).
2.1 ANSI Standards:
B16.1 Cast Iron Pipe Flanges and Flanged Fittings
3.1.2 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
3.1.3 hot condensate capacity (QH)—maximum mass of
B16.5 Steel Pipe Flanges and Flanged Fittings
condensate that a steam trap/drain can discharge in1hata
B16.11 Forged Steel Fittings Socket-Welding and Threaded
given pressure and temperature (lb/h (kg/h)).
B16.15 Cast Bronze Screwed Fittings
3.1.4 hydrostatic proof test (PTHP)—test used in determin-
B16.18 Cast Bronze Solder-Joint Pressure Fittings
ing maximum allowable pressure (PMA) and maximum allow-
B16.22 Wrought Copper and Bronze Solder-Joint Pressure
2 2
able temperature (TMA) (lb/in. (kg⁄mm )).
Fittings
B16.24 Bronze Flanges and Flanged Fittings 3.1.5 maximumallowablepressure(PMA)—maximumpres-
sure that the shell of the steam trap/drain can withstand
B16.34 Steel Valves, Flanged and Buttweld Ends
2 2
B31.1 Power Piping permanently at a given temperature (lb/in. (kg⁄mm )).
3.1.6 maximum allowable temperature (TMA)—maximum
temperature to which the shell of the steam trap/drain can be
raised permanently (°F (°C)).
3.1.7 maximum differential pressure (∆PMX)—maximum
This specification is under the jurisdiction of ASTM Committee F25 on Ships
difference between operating pressure and operating back
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
2 2
pressure (lb/in. (kg⁄mm )).
Machinery and Piping Systems.
Current edition approved May 1, 2015. Published June 2015. Originally
approved in 1988. Last previous edition approved in 2010 as F1139 – 88 (2010).
DOI: 10.1520/F1139-88R15. 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, Two 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 (2015)
3.1.8 maximum operating back pressure (PMOB)— 4.1.8 Type of trap/drain.
maximum permissible pressure measured at the outlet of the 4.1.9 Maximum test pressure, psig (kPa). See 3.1.12.
steam trap/drain allowing correct functioning (lb/in. (kg⁄mm 4.1.10 Maximumallowablepressure,psig(kPa).See3.1.14.
2)). 4.1.11 Pressure differential (operating, maximum, or
minimum, or combination thereof).
3.1.9 maximum operating pressure (PMO)—pressure for
4.1.12 Notice for Acceptance Test—If the purchaser wishes
which a steam trap/drain is rated by the manufacturer.
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)—maximum pressure
5.1 Materials:
applied to the steam trap/drain under test including its internal
2 2
5.1.1 The pressure ratings established under this specifica-
mechanism (lb/in. (kg⁄mm )).
tion are based upon materials of high quality produced under
3.1.11 minimum differential pressure (∆PMN)—minimum
regular control of chemical and mechanical properties by a
difference between operating pressure and operating back
recognized process. The manufacturer shall be prepared to
2 2
pressure (lb/in. (kg⁄mm )).
certify that his product has been so produced and that the
3.1.12 operating back pressure (POB)—pressure measured
mechanical and chemical properties thereof, as proved by test
at the outlet of the steam trap/drain under operating conditions
specimens and nondestructive testing or as documented by
2 2
(lb/in. (kg⁄mm )).
certifications from the producer or recognized distributor of
these materials, are at least equal to the requirements of the
3.1.13 operating differential pressure (∆P)—difference be-
appropriate specifications.
tween the operating pressure and the operating back pressure
2 2
5.1.2 Housings of traps/drains, and other parts or bolting, or
(lb/in. (kg⁄mm )).
combination thereof, used for pressure retention, shall be
3.1.14 operating pressure (PO)—pressure measured at the
constructed of materials in accordance with ANSI/ASME
inlet of the steam trap/drain under operating conditions (lb/
2 2 B31.1 or Section VIII, Division 1 of the ASME Boiler and
in. (kg⁄mm )).
Pressure Vessel Code.
3.1.15 operating temperature (TO)—temperature measured
5.1.3 Seals and parts, in addition to pressure containing
at the inlet of the steam trap/drain under operating conditions
parts and bolting used for pressure retention, shall be of
(°F (°C)).
materials suitable for the service.
3.1.16 performance characteristics tests—tests carried out
5.1.4 Users are cautioned against applications with fluids
to determine the operational characteristics of a particular
that may react chemically with any materials used in these
design of steam trap/drain.
products.
5.1.5 For materials not having values of allowable stress
3.1.17 production tests—tests carried out by the manufac-
tabulated in Section VIII, Division 1, allowable stresses shall
turer to confirm that the steam trap/drain functions correctly.
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—self-contained valve that automatically
one product form (because of similar chemistry, mechanical
drains the condensate from a steam containing enclosure while
properties, directional properties, heat treatment, and so forth)
remainingtighttolivesteam,orifnecessary,allowingsteamto
are applicable to the same material in an unlisted product form,
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 ANSI B16.1,
4.1.2 Certification of performance characteristics if re- 5.2.1.2 ANSI B16.3,
quired. See Section 7. 5.2.1.3 ANSI B16.4,
4.1.3 Nominal pipe size. 5.2.1.4 ANSI B16.5,
4.1.4 Maximum operating pressure, psig (kPa). See 3.1.5. 5.2.1.5 ANSI B16.11,
4.1.5 Capacity, lb/h (kg/h) (QC or QH). See 3.1.17 and 5.2.1.6 ANSI B16.15,
3.1.18. 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,
4.1.7 Materials—external and internal. 5.2.1.10 ANSI B16.34, and
F1139−88 (2015)
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
7.7 Condensate Capacity (QH or QC)—The steam trap/
offered for sale.
drain shall be flow tested to determine its condensate capacity
6.1.1.2 Design calculations in accordance with the require-
throughout its operating pressure range.
ments prescribed in Section VIII, Division 1 of the ASME
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/drain as described in Section 8 by one of the following test average tensile of test specimens of pressure retaining components
methods:
stress value at design temperature
6.2.1.1 Hydrostatic—See 8.2.
stress value at test temperature
6.2.1.2 Steam—See 8.3.
8.1.1 Determine stress values in accordance with Section
6.2.1.3 Air—See 8.4.
VIII, Division 1 of theASME Boiler and Pressure Vessel Code
6.2.2 Samples of the traps/drains shall be visually examined
or ANSI B31.1.
and dimensionally checked to ensure that the traps/drains
8.1.2 Casting quality factor (f) shall be 1.0 for wrought
correspond to this specification and are marked in accordance
materials and 0.8 for castings.
with Section 9.
8.1.3 Gasket leakage during test does not constitute failure
6.2.3 Sample steam traps/drains shall be given an opera-
unless a result of rupture of a pressure containing part.
tional check steam test to ensure that they open to discharge
8.1.4 Do not exceed water temperature of 125°F (50°C)
condensateandclosesatisfactorilyinaccordancewith8.5.This
during the test.
test does not apply to labyrinth (orifice) steam traps/drains.
8.1.5 Retain certification of the hydrostatic proof test by the
manufacturer and make available upon request.
7. Performance Characteristics
7.1 Amanufacturer may describe the operation of a particu- 8.2 Hydrostatic Production Shell Test—Give steam traps/
drains a hydrostatic shell test at a pressure of 1.5 times its
lartypeofsteamtrapordrainbyreferringtooneormoreofthe
performance characteristics. When this is done, the associated maximum allowable pressure rating at 68°F (20°C).
tests described in 8.6 must be performed on a representative 8.2
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F1139 − 88 (Reapproved 2010) F1139 − 88 (Reapproved 2015)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
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.mathematical conversions to SI units that are provided for information only and are not considered standard.
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.
2. Referenced Documents
2.1 ANSI Standards:
B16.1 Cast Iron Pipe Flanges and Flanged Fittings
B16.3 Malleable-Iron Screwed Fittings
B16.4 Cast-Iron Screwed Fittings
B16.5 Steel Pipe Flanges and Flanged Fittings
B16.11 Forged Steel Fittings Socket-Welding and Threaded
B16.15 Cast Bronze Screwed Fittings
B16.18 Cast Bronze Solder-Joint Pressure Fittings
B16.22 Wrought Copper and Bronze Solder-Joint Pressure Fittings
B16.24 Bronze Flanges and Flanged Fittings
B16.34 Steel Valves, Flanged and Buttweld Ends
B31.1 Power Piping
2.2 MSS Standards:
SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions
SP-51 150 lb Corrosion Resisting Cast Flanges and Flanged Fittings
2.3 ASME Standards:
ANSI/ASME PTC 39.1 Condensate Removal Devices for Steam Systems
ASME Boiler and Pressure Vessel Code, Section VIII, VIII Division I, Pressure Vessels
ASME Boiler and Pressure Vessel Code, Section IX, W elding and Brazing Qualifications
3. Definitions of Terms Specific to This Standard
3.1 cold condensate capacity (QC)—maximum mass of condensate that the steam trap/drain can discharge in 1 h at a given
pressure and temperature, the trap/drain being fully open (lb/h (kg/h)).
3.2 drain—device having no moving parts permitting the discharge of fluids at a fixed or adjustable rate.
This specification is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
Current edition approved March 1, 2010May 1, 2015. Published April 2010June 2015. Originally approved in 1988. Last previous edition approved in 20042010 as
F1139 – 88 (2010).(2004). DOI: 10.1520/F1139-88R10.10.1520/F1139-88R15.
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 National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.com.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY 10016-5990,
http://www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1139 − 88 (2015)
3.3 hot condensate capacity (QH)—maximum mass of condensate that a steam trap/drain can discharge in 1 h at a given
pressure and temperature (lb/h (kg/h)).
3.4 hydrostatic proof test (PTHP)—test used in determining maximum allowable pressure (PMA) and maximum allowable
2 2
temperature (TMA) (lb/in. (kg ⁄mm )).
3.5 maximum allowable pressure (PMA)—maximum pressure that the shell of the steam trap/drain can withstand permanently
2 2
at a given temperature (lb/in. (kg ⁄mm )).
3.6 maximum allowable temperature (TMA)—maximum temperature to which the shell of the steam trap/drain can be raised
permanently (°F (°C)).
3.7 maximum differential pressure (ΔPMX)—maximum difference between operating pressure and operating back pressure
2 2
(lb/in. (kg ⁄mm )).
3.8 maximum operating back pressure (PMOB)—maximum permissible pressure measured at the outlet of the steam trap/drain
2 2
allowing correct functioning (lb/in. (kg ⁄mm )).
3.9 maximum operating pressure (PMO)—pressure for which a steam trap/drain is rated by the manufacturer.
3.9.1 Discussion—This pressure is normally a function of the limitations related to the internal mechanism of the steam
2 2
trap/drain (lb/in. (kg ⁄mm )).
3.10 maximum test pressure (PTMX)—maximum pressure applied to the steam trap/drain under test including its internal
2 2
mechanism (lb/in. (kg ⁄mm )).
3.11 minimum differential pressure (ΔPMN)—minimum difference between operating pressure and operating back pressure
2 2
(lb/in. (kg ⁄mm )).
3.12 operating back pressure (POB)—pressure measured at the outlet of the steam trap/drain under operating conditions
2 2
(lb/in. (kg ⁄mm )).
3.13 operating differential pressure (ΔP)—difference between the operating pressure and the operating back pressure
2 2
(lb/in. (kg ⁄mm )).
3.14 operating pressure (PO)—pressure measured at the inlet of the steam trap/drain under operating conditions (lb/
2 2
in. (kg ⁄mm )).
3.15 operating temperature (TO)—temperature measured at the inlet of the steam trap/drain under operating conditions (°F
(°C)).
3.16 performance characteristics tests—tests carried out to determine the operational characteristics of a particular design of
steam trap/drain.
3.17 production tests—tests carried out by the manufacturer to confirm that the steam trap/drain functions correctly.
3.17.1 Discussion—These tests may be witnessed by the purchaser or his representative. In this case, these tests are referred to
as acceptance tests.
3.18 steam trap—self-contained valve that automatically drains the condensate from a steam containing enclosure while
remaining tight to live steam, or if necessary, allowing steam to flow at a controlled or adjusted rate.
3.18.1 Discussion—Most steam traps will also pass noncondensable gases while remaining tight to live steam.
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 cold condensate capacity (QC)— maximum mass of condensate that the steam trap/drain can discharge in 1 h at a given
pressure and temperature, the trap/drain being fully open (lb/h (kg/h)).
3.1.2 drain—device having no moving parts permitting the discharge of fluids at a fixed or adjustable rate.
3.1.3 hot condensate capacity (QH)—maximum mass of condensate that a steam trap/drain can discharge in 1 h at a given
pressure and temperature (lb/h (kg/h)).
3.1.4 hydrostatic proof test (PTHP)—test used in determining maximum allowable pressure (PMA) and maximum allowable
2 2
temperature (TMA) (lb/in. (kg ⁄mm )).
3.1.5 maximum allowable pressure (PMA)—maximum pressure that the shell of the steam trap/drain can withstand permanently
2 2
at a given temperature (lb/in. (kg ⁄mm )).
3.1.6 maximum allowable temperature (TMA)—maximum temperature to which the shell of the steam trap/drain can be raised
permanently (°F (°C)).
3.1.7 maximum differential pressure (ΔPMX)—maximum difference between operating pressure and operating back pressure
2 2
(lb/in. (kg ⁄mm )).
F1139 − 88 (2015)
3.1.8 maximum operating back pressure (PMOB)—maximum permissible pressure measured at the outlet of the steam
2 2
trap/drain allowing correct functioning (lb/in. (kg ⁄mm )).
3.1.9 maximum operating pressure (PMO)—pressure for which a steam trap/drain is rated by the manufacturer.
3.1.9.1 Discussion—
2 2
This pressure is normally a function of the limitations related to the internal mechanism of the steam trap/drain (lb/in. (kg ⁄mm
)).
3.1.10 maximum test pressure (PTMX)—maximum pressure applied to the steam trap/drain under test including its internal
2 2
mechanism (lb/in. (kg ⁄mm )).
3.1.11 minimum differential pressure (ΔPMN)—minimum difference between operating pressure and operating back pressure
2 2
(lb/in. (kg ⁄mm )).
3.1.12 operating back pressure (POB)—pressure measured at the outlet of the steam trap/drain under operating conditions
2 2
(lb/in. (kg ⁄mm )).
3.1.13 operating differential pressure (ΔP)—difference between the operating pressure and the operating back pressure
2 2
(lb/in. (kg ⁄mm )).
3.1.14 operating pressure (PO)—pressure measured at the inlet of the steam trap/drain under operating conditions (lb/
2 2
in. (kg ⁄mm )).
3.1.15 operating temperature (TO)—temperature measured at the inlet of the steam trap/drain under operating conditions (°F
(°C)).
3.1.16 performance characteristics tests—tests carried out to determine the operational characteristics of a particular design of
steam trap/drain.
3.1.17 production tests—tests carried out by the manufacturer to confirm that the steam trap/drain functions correctly.
3.1.17.1 Discussion—
These tests may be witnessed by the purchaser or his representative. In this case, these tests are referred to as acceptance tests.
3.1.18 steam trap—self-contained valve that automatically drains the condensate from a steam containing enclosure while
remaining tight to live steam, or if necessary, allowing steam to flow at a controlled or adjusted rate.
3.1.18.1 Discussion—
Most steam traps will also pass noncondensable gases while remaining tight to live steam.
4. Ordering Information
4.1 Orders for products under this specification shall include the following information as applicable:
4.1.1 Performance characteristics required—See Section 7.
4.1.2 Certification of performance characteristics if required. See Section 7.
4.1.3 Nominal pipe size.
4.1.4 Maximum operating pressure, psig (kPa). See 3.53.1.5.
4.1.5 Capacity, lb/h (kg/h) (QC or QH). See 3.173.1.17 and 3.183.1.18.
4.1.6 Connection type (that is, threaded, socket weld, flanged). See 5.2.1.
4.1.7 Materials—external and internal.
4.1.8 Type of trap/drain.
4.1.9 Maximum test pressure, psig (kPa). See 3.123.1.12.
4.1.10 Maximum allowable pressure, psig (kPa). See 3.143.1.14.
4.1.11 Pressure differential (operating, maximum, or minimum, or combination thereof).
4.1.12 Notice for Acceptance Test—If the purchaser wishes to witness the production tests, this shall be specified in the order.
See 8.2.
5. Materials and Manufacture
5.1 Materials:
5.1.1 The pressure ratings established under this specification are based upon materials of high quality produced under regular
control of chemical and mechanical properties by a recognized process. The manufacturer shall be prepared to certify that his
product has been so produced and that the mechanical and chemical properties thereof, as proved by test specimens and
F1139 − 88 (2015)
nondestructive testing or as documented by certifications from the producer or recognized distributor of these materials, are at least
equal to the requirements of the appropriate specifications.
5.1.2 Housings of traps/drains, and other parts or bolting, or combination thereof, used for pressure retention, shall be
constructed of materials in accordance with ANSI/ASME B31.1 or Section VIII, Division 1 of the ASME Boiler and Pressure
Vessel Code.
5.1.3 Seals and parts, in addition to pressure containing parts and bolting used for pressure retention, shall be of materials
suitable for the service.
5.1.4 Users are cautioned against applications with fluids that may react chemically with any materials used in these products.
5.1.5 For materials not having values of allowable stress tabulated in Section VIII, Division 1, allowable stresses shall be
determined in accordance with the procedures outlined in Subsection C and Appendix P of Section VIII of the ASME Boiler and
Pressure Vessel Code. Where it can be shown that the values of allowable stress listed for a particular material in one product form
(because of similar chemistry, mechanical properties, directional properties, heat treatment, and so forth) are applicable to the same
material in an unlisted product form, the listed values of allowable stress may be used.
5.2 Manufacture:
5.2.1 Steam traps/drains with end fittings in compliance with the following standards may be used within the pressure-
temperature ranges permitted by the applicable standard provided the trap/drain housing (less end fittings) is satisfactory for these
conditions:
5.2.1.1 ANSI B16.1,
5.2.1.2 ANSI B16.3,
5.2.1.3 ANSI B16.4,
5.2.1.4 ANSI B16.5,
5.2.1.5 ANSI B16.11,
5.2.1.6 ANSI B16.15,
5.2.1.7 ANSI B16.18,
5.2.1.8 ANSI B16.22,
5.2.1.9 ANSI B16.24,
5.2.1.10 ANSI B16.34, and
5.2.1.11 MSS SP-51.
5.2.2 Weld design details, welding, and nondestructive testing shall be in accordance with Section VIII, Division 1, of the
ASME Boiler and Pressure Vessel Code. Welders and weld procedures shall be qualified in accordance with Section IX of the
ASME Boiler and Pressure Vessel Code.
6. Requirements
6.1 Pressure Rating and Design:
6.1.1 The maximum allowable pressure (PMA) and maximum allowable temperature (TMA) rating for steam traps/drains
conforming to this specification shall be established by at least one of the following methods:
6.1.1.1 Proof test in accordance with the requirements prescribed in paragraph UG-101 of Section VIII of the ASME Boiler and
Pressure Vessel Code. If burst-type tests as outlined in UG-101(m) are used, it is not necessary to rupture the component. In this
case, the value of “B’’ to be used in determining the maximum allowable pressure shall be the maximum pressure to which the
component was subjected without rupture. Safety of personnel shall be given serious consideration when conducting hydrostatic
tests. Components that have been subjected to a hydrostatic proof test shall not be offered for sale.
6.1.1.2 Design calculations in accordance with the requirements prescribed in Section VIII, Division 1 of the ASME Boiler and
Pressure Vessel Code.
6.1.1.3 Hydrostatic proof test of a representative production sample to establish the maximum allowable pressure (PMA) and
maximum allowable temperature (TMA) rating
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