Custom Search
|
|
|
||
 9
For the assay of glued-laminated timbers, 20 borings shall be taken from the 0- to 3.0 inch zone
in southern pine and 0 to 0.60 inch in coastal Douglas-fir or western hemlock.
10
When reserve treated stock is assayed or when inspection is made at destination, a sample of
the preservative shall be obtained from a randomly selected piling by the procedure given in AWPA
Standard A8. The properties of the recovered oil shall meet the following requirements when tested by
AWPA Standard A1:
Creosote-tar
Creosote
solution
Classes
Class
Class
Classes
l and 2
3
5
1, 2, 3, 4
Percent distilling to:
15
15
15
15
270 degrees C minimum
75
70
65
65
355 degrees C minimum
Specific gravity of
fraction at 38 c/15.5 C:
235 to 315 degrees C minimum
1.025
1.030
1.025
1.030
315 to 355 degrees C minimum
1.095
1.105
1.095
1.105
Residue above 355 degrees C
------
1.160
------
1.160
11
In round building poles or in round posts used in post-and-beam types of foundations,
penetration in each piece 10 inches or less in diameter shall be at least one-half of the radius. In each
piece more than 10 inches in diameter, penetration shall be at least 2.5 inches. In all cases, 90 percent of
the sapwood shall be penetrated
Mechanical means to obtain the required penetration, such as incising or boring are permitted. Borings
to determine penetration shall be taken from the incised area. Borings for assay shall be taken from the
approximate midpoint, but not from the incised area.
12
The higher retention is required for large poles (Group B, 37.5 in. and over in circumference),
for all poles used under severe service conditions and for all poles having a high replacement cost.
13
1.0 inch and 85 percent if sapwood is 2.0 inches or less; 1.75 inches if sapwood is more than
2 inches.
Preparing activity
MILITARY INTERESTS:
AGR-AFS
Army
ME
Navy
SH
Air Force
-84
B-24
|
 
|
|
|
||
