UFC 3 -430-11
14 February 2001
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CODE REQUIREMENTS. Where local or state code requirements differ from
the ASME, ANSI, and NFPA codes, the more stringent code requirements shall prevail.
The following codes apply.
ASME, Boiler and Pressure Vessel Code, Section I, Rules for the
Constructi on of Power Boilers, and Section IV, Rules for the
ASME B16.5, Pipe Flanges and Flanged Fittings
ASME B31.1, ASME Code for Pressure Piping Power Piping
NFPA-70, National Electric Code
NFPA-8501, Standard for Single Burner Boiler Operation
NFPA-8502, Standard for the Prevention of Furnace Explosions/Implosions
in Multiple Burner Boilers
NFPA-8503, Standard for Pulverized Fuel System
State, Local, and Utility Boiler Codes
3-16
Specify that all like instruments, such as all control valves, be provided from the same
manufacturer. Avoid having two control valves in identical service from two different
manufacturers or from the same manufa cturer but of two different model numbers.
3-16.1
Multiple Manufacturers. Multiple manufacturers are acceptable for different
types of instruments. Instruments of the same type, however, must be standardized.
For example, controllers can be obtained from one manufacturer, control valves from a
second manufacturer, and pressure gauges from a third manufacturer.
3-16.2
Packaged Equipment. Packaged equipment, which is often furnished with
instrumentation included, does not always lead to standardization. Buying the package
manufacturers standard, however, might result in considerable cost savings. Even with
packaged equipment, however, the instruments should conform to the plant standards
whenever practical.
3-16.3
Special Considerations. Also standardize the following for the boiler plant.
3-16.3.1 Signal Amplitude. Use standard signals. These are 4 -20 mA DC for
transmitters and control valves, 120 volts AC for switches, and 0.21-1.03 bar (3-15 psig)
for pneumatic signals.
3-16.3.2 Connections. Use standard types of connections and connection sizes.
Avoid non-standard connections.
3-16.3.3 Recorders. Standardize on recording charts, recorder pens, lamps and
similar items. Note that recorders from two different manufacturers most likely will
require different chart paper and pens.
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