pipe properties for wastewater plant 2

[profplan]

I am a structural engineer designing concrete wastewater oxidation ditches.

Carbon steel pipe is used for aeration piping supported from the concrete structure, diameters from 4" to 30". Where can I find a handy table of physical pipe properties for these sizes?


Thanks.

 

[cvg]

you can't unless you can provide the specs for what type of pipe.

 

[profplan]

cvg,

OK. The specification is ASTM A53, Type S, standard weight, Grade B or ASTM A106. Butt-weld. Thanks.

 

[bimr]

Piping Data:

http://www.saginawpipe.com/steel_pipe.htm

Steel properties:

http://mydocs.epri.com/docs/public/000000000001014670.pdf

 

[bimr]

Wikipedia has some reference material as well:

http://en.wikipedia.org/wiki/Nominal_Pipe_Size

 

[profplan]

bimr,

Thanks, that's what I needed.

 

[stanier]

That pipe is not going to last long in that application. Corrosion is the issue in wastewater plants. Modern plants use spiral welded stainless steel (grade 316). older plants used cast or ductile iron which gave a longer design life.
The steel cpuld be coated in fusion bonded epoxy you would get some life out of it.

 

[profplan]

stanier,
Thanks for the insight. I'll ask if the pipe is to be protected for corrosion.

 

[profplan]

stanier,

Sorry. It looks like I had the wrong pipe specification. It changes for different diameters:

up to 12" - ASTM A53, Type E, Schedule 10 or Standard

14" to 24" - ASTM A671 DSAW Grade CC60, Class 12, with ASTM A516 Grade 60 plate; Schedule 10 or Standard wt. to ANSI B36.10

26" to 42" - ANSI/ASME B16.9: Schedule 10 or Standard wt

If anything appears illogical, I may have copied this incorrectly.

I'll check to see if some protection or treatment is provided for corrosion.

bimr,
I assume the pipe dimensions/ properties listed by Saginaw are the same for the above specs.

Thanks all.

 

[bimr]

I was just answering your question regarding pipe material specifications.

Actually, wastewter oxidation units typically do not have aeration piping. Aeration is provided by aeration rotors or brushes.

Aeration piping may be ductile iron, steel, PVC, FRP. or stainless steel.

Metallic piping is used close to the blower because of the heated air associated with the blower.

Stainless steel (sch. 10) or PVC is a good choice for underwater piping.

Painted steel is common for industrial applications.

Many municipal applications use ductile iron and PVC. Steel may be more common for industrial projects.

 

[rconner]

With regard to "pvc" if projects are in the USA, and any air piping is to be exposed, I believe irrespective of temperature issues OSHA has had an advisory in place for many years as noted at

http://www.osha.gov/dts/hib/hib_data/hib19880520.html

regarding pvc pipe (I have not heard aeration piping was exempt).

 

[bimr]

The dangers involved in using rigid vinyl piping products for compressed gas transport are well known in industry.

"Compressed gas" definition:

(1) A gas or mixture of gases having, in a container, an absolute pressure exceeding 40 psi at 70° F (21.1° C); or

(2) A gas or mixture of gases having, in a container, an absolute pressure exceeding 104 psi at 130° F (54.4° C) regardless of the pressure at 70° F (21.1° C); or

(3) A liquid having a vapor pressure exceeding 40 psi at 100° F (37.8° C) as determined by ASTM D-323-72.

http://www.dir.ca.gov/title8/5191.html

Since wastewater aeration systems have operating pressures typically around 10 psig, aeration piping is not considered to be a compressed air system and is by definition exempt.

 

[profplan]

bimr,

My immediate questions have been answered. Thanks.

FYI, the larger diameter aeration piping is located above the concrete tank structures, while the smaller pipes are attached to the sides of the tanks. Some will be insulated to protect personnel from the hot pipe, but there will be no special coating or other protection for corrosion of the above ground piping.