Specifications - Lord and Son Construction, Inc.

shall have a range suitable for the application with an upper end of the
range not to exceed 150% of the design upper limit.
2.9.1.1 Piping System Thermometers
Piping system thermometers shall have brass, malleable iron or aluminum
alloy case and frame, clear protective face, permanently stabilized glass
tube with indicating-fluid column, white face, black numbers, and a 9 inch
scale. Piping system thermometers shall have an accuracy of +/- 1% of scale
range. Thermometers for piping systems shall have rigid stems with
straight, angular, or inclined pattern. Thermometer stems shall have
expansion heads as required to prevent breakage at extreme temperatures. On
rigid-stem thermometers, the space between bulb and stem shall be filled
with a heat-transfer medium.
2.9.2 Pressure Gauges
Gauges shall be suitable for field or panel mounting as required, shall have
black legend on white background, and shall have a pointer traveling through
a 270-degree arc. Gauge range shall be suitable for the application with an
upper end of the range not to exceed 150% of the design upper limit.
Accuracy shall be +/- 3% of scale range. Gauges shall meet requirements of
ASME B40.100.
2.9.3 Low Differential Pressure Gauges
Gauges for low differential pressure measurements shall be a minimum of 3.5
inch (nominal) size with two sets of pressure taps, and shall have a
diaphragm-actuated pointer, white dial with black figures, and pointer zero
adjustment. Gauge range shall be suitable for the application with an upper
end of the range not to exceed 150% of the design upper limit. Accuracy
shall be plus or minus two percent of scale range.
2.10 OUTPUT DEVICES
Output Devices with SNVT input are ASCs and shall meet all ASC requirements
in addition to the output device requirements. (Note: ASCs are specified in
paragraph DIRECT DIGITAL CONTROL (DDC) HARDWARE.)
2.10.1 Actuators
Actuators shall be electric (electronic) . All actuators shall be normally
open (NO), normally closed (NC) or fail-in-last-position (FILP) as shown.
Normally open and normally closed actuators shall be of mechanical spring
return type. Electric actuators shall have an electronic cut off or other
means to provide burnout protection if stalled. Actuators shall have a
visible position indicator. Electric actuators shall provide position
feedback to the controller as shown. Actuators shall smoothly open or close
the devices to which they are applied. Pneumatic actuators shall have a
full stroke response time matching the connected Electric to Pneumatic
Transducer (EP). Electric actuators shall have a full stroke response time
in both directions of 90 seconds or less at rated load. Electric actuators
shall be of the foot-mounted type with an oil-immersed gear train or the
direct-coupled type. Where multiple electric actuators operate from a
common signal, the actuators shall provide an output signal identical to its
input signal to the additional devices.
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