An Investigation of Explosion-Proof Motors Page: 30
56 p. : ill.View a full description of this report.
- Highlighting
- Highlighting On/Off
- Color:
- Adjust Image
- Rotate Left
- Rotate Right
- Brightness, Contrast, etc. (Experimental)
- Cropping Tool
- Download Sizes
- Preview all sizes/dimensions or...
- Download Thumbnail
- Download Small
- Download Medium
- Download Large
- High Resolution Files
- IIIF Image JSON
- IIIF Image URL
- Accessibility
- View Extracted Text
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
30
EXPLOSION-PROOF MOTORS.
unoccupied space within the motor casing had a total volume of 5.1
cubic feet. The combined minimum area of the relief openings was
48 square inches.
Connection with the service line was made to studs inclosed in an
iron terminal box which was rigidly attached to the motor frame.
The leads from the service line were brought into the bottom of the
terminal box through unbushed holes and soldered to brass lugs
Motor running with fan. Motor running with fan.
8.6% gas. 7.0% gas.
Brush ignition. Brush ignition.
External flames.
Card No. D-187.
Max. press. 32.0 - 31.8 - Card No.D-161.
28.2 - 25.0 -22.5 - Max. press. 20.0 -20.0 -
21.8 - 17.8 - 13.0 - 18.7 - 18.4 -18.35 -
10.0 lbs. 16.65 lbs.
Puncture. No puncture.
Motor running with fan. Card No. D-194. Card 1No. D-195.
8.6% gas. Max. press. 34.6 - Motor running with fan. Max. press. 16.5 -
Shell ignition. 31.8 - 30.0 - lbs. 7.0% gas. 14.4 - 10.0 - lbs.
External flames. No puncture. Shell ignition. No puncture.
External flames.
t Card No. D-200.
Motor running without fan. Crd No. D-199. ,Motor running without fan. Max. press. 8.5 Ibs.
8.6% gas. Max. press. 12.2 Ibs. 7.5% gas. No puncture.
Shell ignition. No puncture. Shell ignition.
No flames. No flames.
Motor at rest without fan. Card No. D-205.
Motor at rest without fan. Card No. D-203. 7.5% gas. Max. press. 2.1 lbs.
8.6% gas. Max. press. 3.0 lbs. Shell ignition. No puncture,
Shell ignition. No puncture. No flames.
No flames.
FIGURE 11.-Pressure diagrams for type D protective device.
drilled to fit the studs, to which they were fastened by a single nut.
The studs passed through fiber bushings in the motor frame. The
inner ends of the studs were protected by recessed porcelain blocks.
The terminal box was not designed to be gas-tight. There was no
communicating passage between the terminal box and the interior
of the motor casing.
The armature shaft carried a fan (P1. VI, A) so disposed with
reference to the relief openings as to cause a considerable circulation
of air through the motor casing when the armature was revolving
at its rated speed. The fan consisted of 16 flat blades, 21 by 11
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Clark, H. H. An Investigation of Explosion-Proof Motors, report, 1912; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12261/m1/42/?q=%22United+States.+Bureau+of+Mines.%22: accessed June 3, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.