GB/T 5135.1-2003 Automatic sprinkler system - Part 1: Sprinkler (Text of Document is in English) - Beijing translation compay

1 Scope
This part of GB 5135 specifies the requirements, test methods, inspection rules as well as marking,
packaging, transportation and storage for sprinklers of automatic sprinkler systems.
This part is applicable to sprinklers of automatic sprinkler systems.
This part is not applicable to early suppression fast response (ESFR) sprinklers, multiple nozzle
sprinklers, Water mist nozzles, drencher heads, open-close sprinklers, large-orifice sprinklers and
extended coverage (EC) sprinklers.
2 Normative References
The following normative documents contain provisions which, through reference in this part of
GB 5135, constitute provisions of this part. For dated reference, subsequent amendments (excluding
amending errors in the text) to, or revisions of, any of these publications do not apply. However, the
parties to agreements based on this standard are encouraged to investigate the possibility of applying
the most recent editions of the standards. For undated references, the latest edition of the normative
document referred to applies.
GB/T 7306 (All Parts) “Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints
Are Made on the Threads”
3 Terms, Definitions, Symbols and Units
For the purpose of this part of GB 5135, the following terms and definitions apply.
3.1 Sprinkler
It refers to a kind of water sprinkling device that is started up by itself within the preset temperature
range or by the control equipment according to signals of fire hazards under the action of heat and that
is sprinkled according to the designed water sprinkling shape and flow.
3.2 Conductivity Factor
It refers to the measurement of heat conduction capacity for thermal sensitive elements with the
fixtures, with its symbol of C and unit of (m/s)0.5.
3.3 Response Time Index
It is the measurement action sensitivity for sprinklers, expressed as RTI=τμ0.5 with τ of the time
constant of thermal sensitive elements with unit of s and μ of gas flow rate with unit of m/s. The
symbol for response time index is RTI with the unit of (m · s)0.5.
3.4 Standard Deviation
Where the thermal sensitive elements are symmetrical, the standard deviation refers to the deviation
that the gas flow direction is made not only vertical to the axial line of sprinkler water flow and but
also the plane located for its yoke arm; where the thermal sensitive elements are asymmetrically, it
refers to the deviation where the gas flow direction is made not only vertical to the axial line of