Smooth Flow pipe is a corrugated polyethylene pipe with a smooth interior. This combination provides a lightweight, durable product for storm sewers, culverts, and many other applications where high strength and maximum flow are essential. Haviland Smooth Flow pipe is available with plain ends from 8″ to 30″ and with belled ends from 4″ to 60″. Smooth Flow pipe conforms to AASHTO M-252 and AASHTO M-294 specifications. An installation guide is available specifically for Smooth Flow pipe on our website. As shown below, 4″ through 6″ pipe can be ordered in pallets.


Also available in SmoothFlow, is our innovative SmoothLOCK product.  SmoothLOCK is a mini stick, dual wall pipe product featuring redesigned belled ends with interlocking tabs.  The locking design eliminates the risk of joint separation and improves installation efficiency. This pipe is available in perforated, in sizes 12″ – 24″. Please see chart below for length specifications.

SizeLengthStyle
4"20
20
20
1520
1520
Water Tight
Perf. Sock, Solid w/ Bell
Solid w/ Bell F-477
Pallet w/ Bell (Solid or Perf)
Pallet Solid w/ Bell F-477
6"20
20
20
780
780
Water Tight
Perf. Sock, Solid w/ Bell
Solid w/ Bell F-477
Pallet w/ Bell (Solid or Perf)
Pallet Solid w/ Bell F-477
8"20
20
20
20
Water Tight
Perf, Sock, Solid
Perf, Sock, Solid w/ Bell
Solid F-477
10"20
20
20
20
Water Tight
Perf, Sock, Solid
Perf, Sock, Solid w/ Bell
Solid F-477
12"9.7
9.7
9.7
9.7
20
20
20
20
24
30
SmoothLOCK Perf w/Bell
SmoothLOCK Perf w/Sock, w/Bell
Water Tight
Perf w/ Bell
Solid w/ Bell F-477
Perf, Sock, Solid
Perf, Sock w/ Bell
Solid w/ Bell F-477
Solid
Solid
15"10
10
10
10
20
20
20
24
30
Water Tight
Solid w/ Bell F-477
SmoothLOCK Perf w/Bell
SmoothLOCK Perf w/Sock, w/Bell
Perf, Sock, Solid
Perf, Sock, Solid w/ Bell
Solid w/ Bell F-477
Solid
Solid
18"10
10
10
10
20
20
20
20
20
24
30
Solid w/ Bell F-477
Perf w/ Bell
SmoothLOCK Perf w/Bell
SmoothLOCK Perf w/Sock, w/Bell
Water Tight
Perf, Sock, Solid
Perf, Sock, Solid w/ Bell
Solid w/ Bell F-477
Solid
Solid
24"9.7
9.7
9.7
9.7
20
20
20
20
24
30
Perf w/ Bell
Solid w/ Bell F-477
SmoothLOCK Perf w/Bell
SmoothLOCK Perf w/Sock, w/Bell
Water Tight
Perf, Solid
Perf, Sock, w/ Bell
Solid w/ Bell F-477
Solid
Solid
30"13.5
13.5
20
20
20
20
Perf w/ Bell
Solid w/ Bell F-477
Water Tight
Perf, Solid
Perf w/ Bell
Solid w/ Bell F-477
36"14.5
14.5
20
20
20
Perf w/ Bell
Solid w/ Bell F-477
Water Tight
Perf w/ Bell
Solid w/ Bell F-477
42"13
13
20
20
20
Perf w/ Bell
Solid w/ Bell F-477
Water Tight
Perf w/ Bell
Solid w/ Bell F-477
48"14.5
14.5
20
20
20
Perf w/ Bell
Solid w/ Bell F-477
Water Tight
Perf w/ Bell
Solid w/ Bell F-477
60"14.5
20
20
Solid w/ Bell F-477
Water Tight
Solid w/ Bell F-477