ASTM F2022-01(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: F2022 − 01 (Reapproved 2019) An American National Standard
Standard Test Method for
Performance of Booster Heaters
This standard is issued under the fixed designation F2022; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This test method evaluates the energy efficiency, energy
consumption and water heating performance of booster heat-
2. Referenced Documents
ers. The food service operator can use this evaluation to select
2.1 ASTM Standards:
a booster heater and understand its energy consumption.
D3588Practice for Calculating Heat Value, Compressibility
1.2 Thistestmethodisapplicabletoelectric,gas,andsteam
Factor, and Relative Density of Gaseous Fuels
powered booster heaters.
2.2 ANSI Standard:
1.3 The booster heater can be evaluated with respect to the
ANSI Z223.1-1996National Fuel Gas Code
following (where applicable):
2.3 ASHRAE Handbook:
1.3.1 Energy input rate (9.2).
ASHRAE 1993 Fundamentals Handbook
1.3.2 Pilot energy rate (9.3).
2.4 ASHRAE Guideline:
1.3.3 Flow capacity rate, energy rate, and energy efficiency
ASHRAE Guideline 2-1986 (RA90)Engineering Analysis
with 110°F (43.3°C) and 140°F (60.0°C) supply to the booster
of Experimental Data
heater inlet (9.4).
2.5 NSF Standards:
1.3.4 Thermostat calibration (9.5).
NSF Listing—Food Equipment and Related Components
1.3.5 Energy rate and energy efficiency at 50% of flow
and Material
capacity rate with 110°F (43.3°C) and 140°F (60.0°C) supply
ANSI/NSF 3-1996Commercial Spray-Type Dishwashing
to the booster heater inlet (9.6).
Machines and Glasswashing Machines
1.3.6 Preheat energy and time (9.7). The preheat test is not
ANSI/NSF 5-1992 Water Heaters, Hot Water Supply
applicable to booster heaters built without water storage and
Boilers, and Heat Recovery Equipment
will not have auxiliary water storage connected to the booster
ANSI/NSF 26-1980Pot, Pan, and Utensil Washers
heater to complete the water heating system.
1.3.7 Idle (standby) energy rate (9.8). 3. Terminology
3.1 Definitions:
1.4 The values stated in inch-pound units are to be regarded
3.1.1 booster heater, n—a water heater that raises the
as standard. The SI units in parentheses are for information
booster heater inlet water supply temperature (typically 110°F
only.
to 140°F (43.3°C to 60°C)) to 180°F (82.2°C) or more to
1.5 This standard does not purport to address all of the
provide high temperature sanitizing rinse water for a dish-
safety concerns, if any, associated with its use. It is the
washer machine.
responsibility of the user of this standard to establish appro-
3.1.2 dishwashermachine,n—(hereafterreferredtoasdish-
priate safety, health, and environmental practices and deter-
washer) machine that uniformly washes, rinses, and heat
mine the applicability of regulatory limitations prior to use.
sanitizes eating and drinking utensils. The machine shall be
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Development of International Standards, Guides and Recom-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
This test method is under the jurisdiction of ASTM Committee F26 on Food 4th Floor, New York, NY 10036, http://www.ansi.org.
Service Equipment and is the direct responsibility of Subcommittee F26.06 on Available from American Society of Heating, Refrigerating, and Air-
Productivity and Energy Protocol. Conditioning Engineers, Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA
Current edition approved May 1, 2019. Published June 2019. Originally 30329,http://www.ashrae.org.
approved in 2001. Last previous edition approved in 2013 as F2022–01 (2013). Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd.,Ann
DOI: 10.1520/F2022-01R19. Arbor, MI 48113-0140, http://www.nsf.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2022 − 01 (2019)
capable of removing physical soil from properly racked and rate is determined and checked against the rated input before
pre-scrapeditems,andsanitizingmulti-useeatinganddrinking continuing with testing.
utensils.
4.2 Pilotenergyrateisdetermined,whenapplicable,forgas
3.1.3 uncertainty, n—measure of systematic and precision booster heaters.
errors in specified instrumentation or measure of repeatability
4.3 Flow capacity, energy rate and energy efficiency of the
of a reported test result.
booster for continuous water flow is determined with the
+0 +0
3.2 Definitions of Terms Specific to This Standard:
booster heater inlet water supplied at 110 ⁄–3 °F (43.3 ⁄–1.7
+0 +0
°C) and 140 ⁄–3 °F (60.0 ⁄–1.7 °C).
3.2.1 batchwaterflow—intermittentmodeofwaterdelivery
at specified flow rate and elapse time. This is the typical style
4.4 Flow rate, energy rate and energy efficiency of the
ofwaterdeliveryofaboosterheatersupplyingfinalrinsewater
booster for continuous water flow at 50% of flow capacity is
to a door type dishwasher machine.
determined with the booster heater inlet water supplied at 110
+0 +0 +0 +0
⁄–3 °F (43.3 ⁄–1.7 °C) and 140 ⁄–3 °F (60.0 ⁄–1.7 °C).
3.2.2 booster heater energy effıciency—quantity of energy
imparted to the water while heating, expressed as a percentage
4.5 The preheat energy consumption and time and idle/
of total amount of energy consumed by the booster heater
standby energy consumption rate are determined while the
during the capacity tests.
booster heater is operating with the thermostat(s) set at the
3.2.3 booster heater inlet—the point of connection on the
calibrated setting(s) to deliver 183 6 3 °F at the booster heater
+0
boosterheaterforthewaterlinefromtheprimarysupplytothe outlet. The booster heater is supplied with 110 ⁄–3 °F (43.3
+0 +0 +0
booster heater.
⁄–1.7 °C) and 140 ⁄–3 °F (60.0 ⁄–1.7 °C) water at the booster
inlet.
3.2.4 booster heater outlet—the point of connection on the
booster heater for the water line from the booster heater to the
5. Significance and Use
dishwasher.
5.1 The energy input rate test is used to confirm that the
3.2.5 continuous water flow—uninterrupted water delivery
booster heater is operating properly prior to further testing.
by a booster heater at a specified flow rate. This is a typical
mode of water delivery of a booster heater supplying water to
5.2 Booster heater flow capacity is an indicator of the
a conveyor or rack-less conveyor (flight) type dishwasher
booster heater’s ability to supply hot water for sanitation. The
machine.
booster heater’s flow capacity can be used by the operator to
determine the appropriate size booster heater for their opera-
3.2.6 energy rate—average rate of energy consumption
tion. Booster heater energy rate is an indicator of the booster
(Btu/h or kW, (kJ/h)) during the continuous flow tests.
heater’s energy consumption during continuous water flow.
3.2.7 energy input rate—peak rate at which a booster heater
The energy rate can be used by food service operators to
consumes energy (Btu/h or kW, (kJ/h)).
estimatetheenergyconsumptionoftheboosterheater.Booster
3.2.8 flow capacity energy rate—peak rate at which a
heater energy efficiency is a precise indicator of a booster
booster heater consumes energy (Btu/h or kW, (kJ/h)) during
heater’s energy performance during the continuous flow test.
the flow capacity tests. Refers to maximum energy rate while
This information enables the food service operator to consider
maximum flow capacity rate is supplied.
energy performance when selecting a booster heater.
3.2.9 flow capacity—maximum water flow rate (gal/min,
5.3 Booster heater flow capacity at 50 % of the maximum
gal/h, (L/h)) at which the booster heater can heat water from a
capacity is an indicator of the booster heater’s ability to
specified inlet temperature to an outlet temperature of 183 6
provide hot water for sanitation at this reduce flow rate
3°F (83.9 6 1.7°) during the continuous flow capacity test.
condition. Booster heater energy efficiency at a flow rate of 50
% of maximum capacity is an indicator of a booster heater’s
3.2.10 pilot energy rate—average rate of energy consump-
energy performance at this flow rate. The booster heater outlet
tion (Btu/h) by a booster heater’s continuous pilot (if appli-
temperature during the capacity test at a flow rate of 50 % of
cable).
maximum capacity is an indicator of the booster heater’s
3.2.11 primary supply—the service water heater system that
temperature response at this reduced flow rate.
supplies water to the booster heater under test.
5.4 Preheat energy and time can be useful to food service
3.2.12 thermal effıciency, n—quantity of energy imparted to
operators to manage power demands and to know how quickly
the water, expressed as a percentage of energy consumed by
the booster heater can be ready for operation.
the element(s), gas burner(s), steam coil(s), and steam injec-
5.5 Idle energy rate and pilot energy rate can be used to
tor(s) during the flow capacity tests.Thermal efficiency data is
estimate energy consumption during standby periods.
collected during the continuous flow capacity tests.
6. Apparatus
4. Summary of Test Method
NOTE 1—An energy supply meeting the manufacturer’s specification
6.1 Barometer, for measuring absolute atmospheric
shall be provided for the gas, electric, or steam booster heater under test.
pressure, to be used for adjustment of measured natural gas
4.1 The booster heater under test is connected to the volume to standard conditions. Shall have a resolution of 0.2
appropriatemeteredenergysupply.Themeasuredenergyinput in. Hg and an uncertainty of 0.2 in. Hg.
F2022 − 01 (2019)
6.2 Exhaust Hood, (if applicable) some gas booster heaters 6.13 Solenoid Valve, for regulating water flow from the
may require an exhaust hood for exhausting gas combustion booster heater. Sized to booster heater manufacturer’s pipe
products. Follow manufacturer’s venting specifications.
diameter specifications.
6.3 Flowmeter, for measuring total water consumption of
6.14 Tempering Valve or Equivalent Temperature Control
the booster heater. Shall have a resolution of 0.01 gal (40 mL)
Device, for regulating the temperature of the water being
and an uncertainty of 0.01 gal (40 mL) at a flow rate as low as
supplied to the booster heater inlet. Tempering valve shall be
0.2 gpm (13 mL/s). Shall be designed to operate with water
capable of operating within the delivered water temperature
temperatures between 50°F to 195°F. The flowmeter shall be
range from 100°F (37.8°C) to 150°F (65.6°C) and capable of
calibrated at both 110°F and 140°F booster heater inlet
maintaining 61.5°F (60.8°C) of any specific delivery tem-
temperatures and their corresponding test flow rates and
perature set point within this range.
booster heater outlet temperatures.
6.15 Steam Flowmeters, for measuring the flow of steam to
6.4 Gas Meter, for measuring the gas consumption of the
the booster heater (if applicable). Shall have a resolution of
boosterheater(ifapplicable).Shallhavearesolutionofatleast
3 3
3 3 0.01 ft (0.0003 m ) and a maximum uncertainty of1%ofthe
0.01 ft (0.0003 m ) and a maximum uncertainty no greater
measured value.
than1%ofthe measured value for any demand greater than
3 3
2.2ft /h(0.06m /h).Ifthemeterisusedformeasuringthegas
6.16 Calibrated Exposed Junction Thermocouple Probes,
consumed by pilot lights, it shall have a resolution of at least
industrystandardTypeTorTypeKthermocouplewitharange
3 3
0.01 ft (0.0003 m ) and have a maximum uncertainty no
from 50°F to 200°F (10 to 93.3°C), a resolution of 0.2°F
greater than2%ofthe measured value.
(0.1°C), and an uncertainty of 1.0°F (0.5°C), for measuring
temperature at the booster heater inlet and outlet connections.
6.5 Insulation, for insulating all exterior fittings and plumb-
Calibrated Type K or Type T 24 GA thermocouple wire with
ing. The insulation shall have a thermal insulation value (R
2 2
value) of at least 4 (h × ft × °F)/Btu (5.67 (m × °C)/W). stainless steel sheath and ceramic insulation is the recom-
mendedchoiceformeasuringtheboosterheaterinletandoutlet
6.6 Pressure Gage, for monitoring natural gas pressure.
temperatures. The thermocouple probe shall be fed through a
Shall have a range of 0 to 10 in. H O, a resolution of 0.5 in.
compression fitting so as to submerse the exposed junction in
H O, and a maximum uncertainty of1%ofthe measured
booster heater water inlet and outlet.
value.
6.17 Temperature and Pressure Relief Valve(s), sized to
6.7 Pressure Gage, for monitoring water pressure supplied
handle the maximum energy input of the booster heater with
to and from the booster heater. The pressure gage on the
automatic reset and capable of releasing at temperatures and
downstream side of the booster heater shall have a range of 15
pressures above the booster heater maximum working condi-
to 25 psi, a resolution of 61 psi, and a maximum uncertainty
tions. The relief valve can be integral with both temperature
of1%ofthe measured value. The pressure gage on the
and pressure relief capacity or separate valves for temperature
upstream side of the booster heater shall have a range of 0 to
200 psi, a resolution of 65 psi, and a maximum uncertainty of and pressure control.
1 % of the measured value.
6.18 HammerArrestor(ShockAbsorber),toeliminatewater
6.8 Stopwatch, with a 1-s resolution.
hammer caused by the quick closing of the solenoid valve.
6.9 Temperature Sensor, for measuring natural gas tempera-
6.19 Throttling Valve, to adjust the water flow rate (gal/min
ture in the range of 50°F to 100°F (10°C to 37.8°C), with a
and gal/h) from the booster heater. Maximum water flow
resolution of 0.5°F (0.3°C) and an uncertainty of 61°F
through throttling valve shall be large enough to accommodate
(0.6°C).
the largest water flow requirements of the booster heater.
6.10 ThermocoupleProbe,industrystandardTypeTorType Throttling valve shall be gate type or equivalent industry
Kthermocouplescapableofimmersionwitharangeof50°Fto standard.Valve shall be sized to booster heater manufacturer’s
200°F (10°C to 93.3°C) and an uncertainty of 61°F. pipe diameter specifications.
6.11 Watt-Hour Meter, for measuring the electrical energy
6.20 Primary Supply, water heating system capable of
consumption of a booster heater. Shall have a resolution of at
supplyingwaterateachofthefollowingtemperaturerangesof
+0 +0 +0 +0
least 10Wh and a maximum uncertainty no greater than 1.5 %
110 ⁄–3 °F (43.3 ⁄–1.7 °C) or 140 ⁄–3 °F (60.0 ⁄–1.7 °C) for
of the measured value for any demand greater than 100W. For
all water flow rates required by the booster heater.
any demand less than 100 W, the meter shall have a resolution
6.21 One Way Check Valve, water valve that allows water
of at least 10 Wh and a maximum uncertainty no greater than
flow in one direction only.Valves to be installed in water lines
10 %.
where flow should be directional.
6.12 Water Pressure Regulator, for controlling the water
6.22 PlatformBalanceScale,orappropriateloadcells,used
linepressuretoandfromtheboosterheater.Tworegulatorsare
to measure the collected booster heater outlet discharge during
required. Adjustable within a range of 10 to 30 psi for the
regulator downstream of the booster heater. Adjustable within capacitytests.Shallhavethecapacitytoaccommodatethetotal
weight of the water discharged during the test with resolution
a range of 10 to 200 psi for the regulator upstream of the
booster heater. of 0.2 lb (10 g) and an uncertainty of 0.2 lb (10 g) .
F2022 − 01 (2019)
7. Sampling, Test Units booster heater’s pressure regulator to within 62.5 % of the
operating manifold pressure specified by the manufacturer.
7.1 Booster Heater— Select a representative model for
Make adjustments to the booster heater following the manu-
performance testing.
facturer’s recommendations for optimizing combustion.
8. Preparation of Apparatus
8.6 Set the controls of the primary supply system to main-
8.1 Install the booster heater in accordance with the manu- +0 +0
tain the two temperature ranges of 110 ⁄–3 °F (43.3 ⁄–1.7 °C)
+0 +0
facturer’s instructions in a well ventilated area in compliance
and 140 ⁄–3 °F (60.0 ⁄–1.7 °C) at the booster heater inlet.
with local codes or, in the absence of local codes, the National
NOTE 4—The primary supply system water temperature requirements
Fuel Gas Code, ANSI Z 223.1. A booster heater designed for
may require additional components attached to primary system, These
floorplacementshallbeinstalledonanoncombustiblefloor.In
components may include storage tanks, recirculating pumps, temperature
the case of a combustible floor, a suitable noncombustible
sensors, and tempering valves. The booster heater shall be tested under
material shall be placed between the booster heater and the both booster heater inlet temperature conditions. The primary supply
system may need energy inputs 2 to 3 times the booster heater input
floor.Aboosterheaterdesignedfornonfloorplacementshallbe
depending on incoming water temperatures to the primary supply, heating
installed on a wall in accordance with the manufacturer’s
efficiency of primary supply and the output of the booster heater under
directions. Booster heaters not designed to be mounted to a
test.
combustiblewallmaterialshallhaveasuitablenoncombustible
8.7 Install a water line pressure regulator upstream of the
material placed between the booster heater and the wall.
booster heater. Install a water pressure gage between the
Position the booster heater with at least 6 in. of space around
pressure regulator and booster heater. Adjust the regulator so
theoutsideedgesoftheboosterheaterortothemanufacturer’s
that the water line pressure to the booster heater is maintained
specification if more space is required around the booster
between20psiandtheboosterheatermanufacturer’sspecified
heater. For a gas-fired booster heater, install venting in accor-
maximum pressure, when no water is flowing.
dancewithmanufacturer’sspecifications.Ifthemanufacturer’s
specification does not specify venting requirements, then
NOTE5—Awaterflowmetermaycomewithfactorycalibrationfactors.
Unless the flowmeter is calibrated at the factory with the same booster
install vent ducting to comply with ANSI Z 223.1. The
heater inlet and outlet temperatures and the same flow rate as the test
associated heating or cooling system shall be capable of
conditions, the flowmeter will have to be recalibrated using the test
maintaining an ambient temperature of 75 6 5°F (23.9 6
condition booster heater inlet and outlet temperatures and flow rates. For
2.8°C) within the testing environment when the exhaust
the best flowmeter calibration accuracy, calibrate the flowmeter during
ventilation system and/or the booster heater are operating. each 30 min flow capacity test.
NOTE 6—For pipe elbows use large radius turns to reduce frictional
8.2 Connect the booster heater to a calibrated energy test
losses in the piping system.
meter. For gas installations, install a pressure regulator down-
8.8 Install a tempering (mixing) valve or equivalent tem-
stream from the meter to maintain a constant pressure of gas
perature control device, at least 10 pipe diameters upstream
for all tests. Install instrumentation to record both the pressure
from the booster heater inlet.
and temperature of the gas supplied to the booster heater and
the barometric pressure during each test so that the measured
8.9 Install the exposed junction thermocouple sensor in the
gas flow can be corrected to standard conditions. For electric
center of the piping at the booster heater inlet and booster
installations, a voltage regulator may be required if the voltage
heater outlet. The thermocouple shall be installed no further
supply is not within 62.5 % of the manufacturer’s nameplate
than a maximum of 3 in. (8 cm) from the booster heater
voltage. For gas booster heaters, record gas temperature,
connection.
pressure and heating value. Record barometric pressure.
8.10 Installaflowmeter(optional)atleast10pipediameters
NOTE 2—The booster heater heating element(s) or burner(s) energy
upstream of booster heater. Position the flowmeter in accor-
consumption may be submonitored to separate their energy consumption
dance with the manufacturer’s recommendations, away from
from other components of the booster heater. Submonitored energy
pipe restrictions (pipe turns, temperature probes, tempering
consumption of the element(s) or burner(s), the water flow rate and
valves, pressure gages, and etc.) to ensure accurate readings
booster inlet and outlet temperatures can be used to calculate the thermal
(see Fig. 1). An alternative to using a flow meter is to collect
efficiency of booster heat exchanger. See 10.8.4 for equations to calculate
the booster heater (heat exchanger) thermal efficiency.
the water discharge from the booster heater in a tank. Using a
scale the weight of the water in the tank is measured directly.
8.3 Plumbing piping and fittings shall be constructed of the
brass, copper or stainless steel using the booster heater manu-
8.11 Install a throttling valve (gate or ball) in the booster
facturer’s recommended pipe sizes.
heater outlet pipe at least 20 pipe diameters away from the
outlet connection of the booster heater. Position the throttling
8.4 Foranelectricboosterheater,confirm(whilethebooster
valve at least 10 pipe diameters away from other restrictions
heaterelementsareenergized)thatthesupplyvoltageiswithin
(pipe turns, temperature probes, tempering valves, pressure
62.5%oftheoperatingvoltagespecifiedbythemanufacturer.
gages, etc.) (see Fig. 1).
Record the voltage for each test.
8.12 Insulate the inlet pipe from the booster heater to
NOTE 3—If an electric booster heater is rated for dual voltage (for
example,208/240V),theboosterheatershallbeevaluatedastwoseparate
primary supply. Insulate the outlet piping from the booster
booster heaters in accordance with this standard test method.
heaterforminimumlengthof4ft.Theinsulationmaterialshall
8.5 For a gas booster heater, adjust (during maximum have thermal resistance (R) value of not less than 4°F × ft ×
energy input) the gas supply pressure downstream from the hr/Btu (0.7°K × m /W).
F2022 − 01 (2019)
FIG. 1 Typical Equipment Configuration
commercial food service operations. This test method uses two separate
8.13 Installasolenoidvalveintheboosterheateroutletpipe
+0 +0
booster heater inlet water temperature ranges of 110 ⁄–3 °F (43.3 ⁄–1.7
at least 20 pipe diameters away from the outlet connection of
+0 +0
°C) and 140 ⁄–3 °F (60.0 ⁄–1.7 °C) for testing conditions. The two
the booster heater. Position the solenoid valve 10 pipe diam-
temperature ranges are used to represent these two typical real-world
eters away from pipe restrictions (pipe turns, temperature
operational conditions for booster heaters.
probes, throttling valves, pressure gages, etc.) to reduce turbu-
9.1.1.1 Record booster heater inlet and outlet water tem-
lent water flow. Install a water hammer right next to the
solenoid valve on the upstream side of the solenoid valve (see peratures at 10 s intervals.
Fig. 1).
9.1.1.2 Ambient temperature of test room near appliance as
described in 8.14.
8.14 Installatemperaturesensortorecordambienttempera-
turesofthetestroom.Measuretheheightoftheboosterheater.
9.1.2 For gas booster heaters, record the following for each
Thesensorshallbeplaced24in.(610mm)awayfromthefront
test run:
oftheboosterheaterandataheightofhalftheboosterheater’s
1) Higher heating value,
height (see Fig. 2).
2) Standard gas pressure and temperature used to correct
measured gas volume to standard conditions,
9. Procedure
3) Measured gas temperature,
9.1 General:
4) Measured gas pressure,
9.1.1 The suite of tests (9.4 – 9.8) shall be conducted with
5) Barometric pressure, and
the booster heater inlet supply water temperature at both 110
6) Energy input rate during or immediately prior to test.
+0 +0 +0 +0
⁄–3 °F (43.3 ⁄–1.7 °C) and 140 ⁄–3 °F (60.0 ⁄–1.7 °C) except
fortheinputrate(9.2)andpilot(9.3)tests.Testresultsshallbe
NOTE8—Foragasappliance,thequantityofheat(energy)generatedby
reported separately for the two booster heater inlet water thecompletecombustionofthefuelisknownastheheatingvalue,heatof
combustion, or calorific value of that fuel. For natural gas. this heating
supply temperatures. Obtain and record the following for each
value varies according to the constituents of the gas. It is measured in
run of every test (gas, electric, and steam units).
Btu/ft .The heating value shall be obtained during testing and used in the
NOTE 7—Booster heaters can be found in both institutional and determination of the energy input to the appliance.
FIG. 2 Placement of Thermocouple to Measure Room Ambient Temperature
F2022 − 01 (2019)
+0
Using a calorimeter or gas chromatograph in accordance 9.4.1 Supply the booster heater inlet with 110 ⁄–3 °F (43.3
+0
with accepted laboratory procedures is the preferred method ⁄–1.7 °C) temperature water.The water pressure to the booster
for determining the higher heating value of gas supplied to the heater shall be maintained in accordance with 8.7 during
booster heater under test. It is recommended that all testing be testing.
performed with gas having a higher heating v
...