Copperstone-CS 951012The City With A Beautiful Future
P,O. Box 478
Coppell, Texas 75019
214-462-0022
October 12, 1995
,/~Mr. Larry Fischer
United States Pipe and Foundry Company
P.O. Box 260848
Piano, Texas 75026
Re: 16" Ductile Iron Pipe
Dear Mr. Fischer:
I have reviewed the submittals for the various classes of 16" ductile iron pipe. IJpon
completion of my review, I find the Class 250 16" ductile iron pipe acceptable to use in the
Coppell Water System.
If ya'u have any
Sincerely,
Ho~vard L. Pafford
Utilitie~ Superintendent
cc: Larry Davis, Con;t!
this matter, please contact me at (214) 304-3545.
Inspector
0CT-1~-'95 THU 10:~?
~?~
~D:U S P~PE-D~LL~S
TEL NO:(2'-- 423-4573
~199 P01
UNITED STATES PIpE AND FOUNDRY COMPANY
POST OFFICE BOX 260848
PLANO, TEXAs 75026
FAX NUMBER:
FROM:
FACSIMILE TRANSMISSION
NUMBER OF PAGES TO FOLLOW:_ '-~
DATE:,
OUR TELEPHONE NUMBER: (214) 423-3881
OUR FAX NUMBER; {;'14! 4Z3-4573
........... 0CT-12-'95 THU 10:27 ID:U S PIPE-DALLAS TEL N0:£214)42~-4573
Thickness~r-, Dimensions and Wei.qh~s
of Ductile Iron TYTON JOINT' Pip~
~199 P02 ....
Thickness~, dimemdon~ anti weight~ of 4" tlarough 64" Ductile Iron l~.pe conform to ANSt/AWWA
C151/A21.51,
Om~de W~ght Per Avg. W~gh~
0,~ ~ ~
O~ 6~ ~ 16.6
0~ 9.~ ~ ~o
o.~ 11,10 5i0
0.~ ~-~ ~0
O~ ~ ~ ~.8
031 ~ ' ~ 47.2
O~ ~.~ 1~ ~.9
0.~ ~,~ 1~ ~,5
0.~ 21.~ ~ ~1.6
0.~ 21.~ ~ W.6
0,~ 21,.~ 14~ 81.6
0.~ ~ ~ I~D
0.~ ~ ~ 110~
O~ 3~ ~ 1~.2
O~ ~ ~
0-~ ~ ~ l~t
0.49 ~ ~10 ~.1
0.42 ~ ~ 1~.1
0.47 ~ 3~ ~1.1
0.51 ~;~ ~ 1~
0CT-12-'95 THU 10:28 ID:U S PIPE-D~LLRS TEL NO: (21z~42~-457~
~199 PO~
S~
$
Table 6
Rated Working Pressure and Maximum Depth of Cover
O~
o~
0~8
0~8
0.80
o.~!
0~
O~
O~
O38
O~
0~8
O~Z
O.4O
o.~
o~4
O~
O~
o.49
o.~8
O~
{147
0.51
o.~
15
15
10
11
18
17
19
15
17
14
17
19
15
17
19
9
L2
19
9
16
19
D145
.... 0CT-1~-'95 THU 10:28 ID:U S PIPE-DALLAS TEL N0:£2~)423-4573 ~199 P04
gTa.ble 5
:Thickness for Internal Pressure
~" C/dadat~l U~ C~mlated U*a ~t~d L~ c~ml,~l
4 0.16 ~ 0.t~ ~ 037
6 0.17 ~ 0,~ ~ 0.19
8 0-18 ~ 0.19 ~ 0,21
10 Om ~ O~ ~ a~
~ 0,~ ~ 0.~ ~ O~
14 O~ ~ O~ ~ 0.~
m 0.~ ~ O~ ~ O~
18 o~ ~ O~ ~ 03~
~ o~ ~ O~ ~ 0~
~ O~ ~ 0,~ ~ 0.47
~ 0.4~ ~ 0.47 ~ 0.~
~ 0.~ 1~ 0-~ ~ O~
~ O~l 1~ O~ ~ 0.~
~ O~ ~ 0~ ~ 0.~
~ O~ ~ 0.~ ~ 0.~
Ta.ble 4
, ThIckness for Earth Load Plus Truck Load
i (cont.'d)
~199 P05
of To*al ~ ~ ~
Cower* ~ Use C~--alated U~ C4de~t~d U~e ~ Use ~ U~
5 O~ ~ O~ ~ 0.~ ~ o~ ~
7 O~ ~ ~ ~ 0.~ ~ 0.~ ~
8 O~ ~ O~ ~ O~ ~ o~ ~
~ 0-~ ~ O~ ~ o.~ ~ o-~ ~
~0 O~ ~ 0,~ ~ 0,~ ~ 0,~ ~
~ ~31 ~ O~ ~ o~ ~ 021 ~
14 O~ ~ ~ ~ ~ ~ ~21 ~
~ -- 0~1 ~ O~ ~ 021 ~
16 ~ O~ ~ 0,~ ~ 0-~ ~
4 ~ ~ O~ ~ O~ ~ O~ ~
5 O~ ~ ~ ~ 0,~ ~ ~ ~
~ 0.~ ~ O~ ~ 0.~ ~ O~ ~
7 0,~ ~ ~ ~ O~ ~ 0.~ ~
8 o~ ~ ~ ~ 0.~ ~ 0,~ ~
9 a~ ~ o~ ~ o~ ~ 021 ~
14 O~ ~ ~1 ~ 0.~ ~ 0-~ ~
~ O~ ~ 0.~ ~ O~ ~
~ ~ 0.~ ~ o~ ~
~ --
S 0.~ ~ 0.~ ~ O~ ~ O~ ~
~ 0.~ ~ O~ ~ o~ ~ O~ ~
~ O~ ~ 0-~ ~ 0.~ ~ 0.~ ~
~ 0,~ ~ O~ ~ O~ ~ O~ ~
~ ~ ~ O~ ~ O~ ~ O~ ~
~ O~ ~ 0~ ~ 0,~ ~ O~ ~
14 O~ ~ O~ ~ 0,~ ~ O~ ~
-- O~ ~ O~ ~
~ ~ 0,~ ~ ~ O~ ~
0CT-12-'95 THU 10:29 ]D:U S P~PE-DIqLLRS TEL NE):
Table 1
Design Values for Standard Laying Conditions
~199 P06
Laying Conditions Description E1 Beddi~ Kb
~t, bou~t~h.t~t~:~l. ZSO ~ I O.~ 0.~
' : ~ W ~e of
; ~ ~ ~ ~d, ~a~ or ~ ~ 0.~7 0.~
~ ~d~ ~ ~ ~ 7~ ~* 0,~ 0.~
~5
OCT-12-'cJ5 THU 10:~0 ID:U S PIPE-D~LL~S
'Introduction
Ductile Iron Pipe Design
TEL NO: (21~]42~-4573
~199 P0?
U.S. Ductile Iron pipe has now come
of age.
Since the late 1940s cont/nuous teste and field
exper/ence have brought the Vreducfion and use o~Ductile
Iron pipe to matur}~. Ductile Iron is a high strength,
tough, material treed irt water ~ad sewe~ systems in all
50 state~ of the United Statse and in many other areas
of the world.
Although Ductile Iron is chemically akin to gray iron
of low phosphorus content, there are eignifioan~
difference. Duet/lo Iron mu~t have a low sulfur content,
requiring a desulfurizing treaUn~t when the base metal
/s melted in a conve~fional oupol~ After tM.. rnaffnesium
is added, which in turn is followed by a po~inoculat/on
treatment with a ~lio0n baoe alloy, These procees
cause a profound change in the manner that the carbon,
as a graphite, is formed dufir~ the flx~ng of the iron.
Instead of the interlaced flake form found in gray iron,
the graphite cl0vetope myriads of isolated ~ewids. The
matrix becomes relai/vely continuous, thereby greatly
increasing the strength, ductility and impact resistance
of tho metal.
From the standpoint of mechanical properties, Ductile
lxon more nearly tes~nb~ steel than gray iron. Like
steel, ductile iron haz a definite y/eld point, w/t.h a modulus
of ebst/c/ty of approximately 24 million ps/.
The mechanical propertie~ of U~. Duct/le Iron pipe
conform to ANSI/AWWA C15I/A~1.$1 and the following
design method conforms to AN$I/AWWA C1,50/A21,,50,
Lo:~g-term experience and e~ahaastivo re.arch have
clearly, established the excellent corrosion res/stance
gray cazt iron, and in nor,,,nl environments, it
indefinitely without special corrosion protectior~ The fact
i~ well known that in more than 366. utilities in North
America~ ca~ iron pipe has gerved continuously for over
a cent~y. The development and use of Ductile Iron pipe
made it possible to evaluate its service characterist/es as
compar to gray iron pipe and it been o0nfirmed
that its corrosion resi~tan~ is equal to or g~eater tha~
tho gxt~llent r~sis~tance of gray/ton p/pe~ It has ~ been
learned through both laboratory te0ting and field
ex~t~ that Duetilo ~xon /~ far 1~ su~;e~ible to
~aY ~ron.
In 1968, DIPRA publ/shed a prove~ environmental
evaluation system which allows engineers and ut/lit/es
.to determine areas of requ/md external protection for east
~rOn pipe. Knowledge of the comparat/ve corrosion
resistance of Ductile Iron t0/pe make~ it proper to apply
the same environmental evaluation vrocedureo to thio
mat~al.
Since years o/'experlence had established that corrosion
protection of iron pipe cannot be provided, or even
ei~nificantly embanced~ by merely in~reasing pipe wall
effective, yet inexpensive, cormaien prevent/on system.
It was discovered that loose polyethylene encozement
provided excellent protection again0t oofl corro~on oz well
az stray direct cu~t. This material provides the ~ame
complete protection ~r Duc//le as for gray iron pitm
DIPRA has rocommended polyethylene encasement for
thotmands of milos of gray and Ductile Iron pipe in
severely corrosive soft areas, Polyethylene encasement
has proven to be ~m extremely effective and economical
corrosion prvtection ~y~tem.
In 1971, ANSI ~tandard~ Committee A21, ande~ the
sponsorzh/p of AWWA, NEWWA, AGA and ASTM (the
Committee responsible for the currant revision of ANSI/
AWWA C150/A2L50) developed ANSI/AWWA C105/
A21,5 -Polyethylene Encazement for Gray and Duc~le
Cast Iron Piping for Water and Other L/quids, which
provides details on material and installat/on and
incorporates DIPRA'~ 1968 evaluation procedure az an
append/x.
Corroaion resistance data, extensive field service
experience and accurate ~oil evaluation, togethe~ with
proven corros/on prevenl/on using polyethylene encase-
ment~ have demonstrated the correctness of the revision
o£ ANSI/AWWA C150/A21.50. Des/gnem may now
approach any known set of field conditions with
confidence in th~ knowledge that properly dedlgned and
lng, ailed Ductile Iron pipe will not fail because of
cerro~ion.
The 1991 l~evioious of ANSI/AWWA C150/A21.50 and
ANSI/AWWA C151/A21.51 include tables with the
nominal thieknea~ for each of the Standard Pressure
Classe~, These Pr~su~ Claose~ are defined as the mtad
water working pressure, in ps/, of the p/po. The nominal
thickne~es ehown for these ~andard pre. ute daz~e~
oxe adequate for the rated working pressure plus a surge
allowance of 1~0 p~ Othor tablez m these two standards
allow the dimensior~ and weight~ for Spe~_~) Cla~ses of
p/pe. These "$vecial Clas.~e~" are the Thickness Cla~es
of the "50" soties (i.e. Thickne~ Clas~ 50, Th/ckne~ Class
52, etc.) which have been a part of the~e standards for
a number of years.
U.S. P/pe qualifies for Federal Procurement under
Public Law No. 94~580, Sect/on 6002, known az the
Resource Recovery Act of 1976, eince, due to modem
technology, recycled i~on and ~ecl scrap is used to a large
degree in our Duc~ile Iron pipe product/on.
DI-2
TEL NO: (2~4~423-4573
Tabte2
Standard Pressure ClassesofDuctile iron Pipe
~199 P08
./
Nominal TRicknes~ for 8t_~nd~ Premmre Cla~seo of Duc~le-Iron Pipe
Prezzure Class*
Size Outside
~. D/~ 1~0 200 250 300 3,50
Nominal Thickness -- ~
3 3,96 .... 0.25**
4 4.80 .... 0.25**
6 6.90 .... 0.25**
8 9.05 .... 0,2..5**
12 1320 .... 028
14 15.30 -- -- 0~28 0.30 0.31
16 17.40 -- -- 0.30 0.32 0.34
18 19.50 -- -- 0.31 0.84 0.36
20 21.60 -- -- OJ~8 0.86 0.88
24 25.80 -- 0~38 0.37 0,40 0.43
80 32.00 0~34 0~38 0.42 0.45 0.49
38 38.30 0~9 0.42 0.4? 0,61
42 44.50 0.41 0.47 0.52 0,67 0.63
48 50,80 0.45 0.52 0,58 0.64 0.70
54 57.5~ 0.51 0.58 0.65 0.72 0.79
60 61.61 0.5~ 0.61 0.~8 0.76 0.88
64 65.67 0~6 0.64 0,72 0~0 0.87
*Pre,sum Classes ave defined as the rated water p~ssure of the"-l~pe in l~i The ~t shown
adequate for the rated wa~ldng water l~eSsure plus a surge ,llowance of 100 psi. Calculations are b~sed on a
rain/mum yield strength ~f 42,000 and a 2.0 safety factor//roes the sum of the warking pre~ ~d 1~ ~
surge -llowsnc~
**CMculated thicknesses for these sizes and pressure ratJnffs are less than tho~e shown above. Presently these
are the low~t nominal thickIlesaes avail,ble/n the/~ sizes.
NOTE: Per ANSI/AWWA C150/A21.50, the thickness~ above include the 0.0~' zezvice allowanCe and the
casting tolerance ~ below by ~ ranges:
Size (inches) Ca.t~g Tol~anc~ (inches)
3 -8
10- 12 0.06
14- 42 0.07
48 0.08
54 - 64 0.09