Pellet pipe ????

I will share what I know if you share what you know. wink wink!

I am in the market for some PVP pipe too. I have to move up to 4" as the inspector added to my vent. I had to add another 2 90º and a 3 foot rise. Killed my EVLwith the 3 inch. PM details if you can share.

The difference I see is the inner liner material.
Pellet Vent is 304 Stainless steel, Pellet VentPro is 316 Stainless steel. The PVP has better high temp seals at the joints where PV is just a rope seal. PVP seal desigh is at the inner joint where PV is just a rope butt joint seal. Either way I have found you still need to seal the inside the house joints with silicone or aluminum tape.

If you can swing the extra cost PVP will last a bit longer if you are or plan to burn corn. PV is rated for corn too just may not last as long. Both will handle many multifuel fuels or biomass as they call it.

I can post a list if you need it. But nut shells are covered by both.

Pro pipe is a bit different, being a newer, tighter-fitting design.....

Got this out of a spec sheet for 316 stainless. It doesn't mention nitric acid but many others......

Corrosion Resistance
Types 316 and 316L Stainless Steels exhibit better corrosion
resistance than Type 304. They provide excellent
resistance to pitting type corrosion such as encountered
in a sea coast environment. They also provide good
resistance to most chemicals involved in the paper, textile
and photographic industries. They are particularly
useful in one to five percent sulfuric acid solutions up to
150°F (66°C) as well as acetic, phosphoric, formic and
tartaric acids, and in certain chloride, bromide and iodide
solutions.

This chart DOES show nitric acid and it looks darn good at concentrations up to 80%.

TemperatureoC 20 80
Concentration, (-% by mass) 10 20 40 60 80 100 10 20 40 60 80 100
Sulphuric Acid 0 1 2 2 1 0 2 2 2 2 2 2
Nitric Acid 0 0 0 0 0 1 0 0 0 0 1 2
Phosphoric Acid 0 0 0 0 1 2 0 0 0 0 1 2
Formic Acid 0 0 0 1 1 0 0 0 1 1 1 0

Key: 0 = resistant - corrosion rate less than 100 mm/year
1 = partly resistant - corrosion rate 100 m to 1000 mm/year
2 = non resistant - corrosion rate more than 1000 mm/year

shows up weird so the link is here: http://www.fanagalo.co.za/tech/tech_grade_316.htm

Corn is the nasty one giving off fumes that get converted to nitric acid in the presence of moisture/condensation.

In your signature you say the Quad 1000 'does not do the nut thing'. Do you mean that it won't burn the shells? We have a lot of pecan shells here in Georgia that I could get.

PVP has welded seems and not crimped. They are both double wall pipe with only air space between the walls (PVP and Pellet/corn vent). The "bio" rated PVP has a second "o" ring gasket and is a little better than the original PVP. Do not mix pellet/corn with PVP.

Eric

What did you mean by 'do not mix pellet/corn with PVP'??? It looks like the better SS should handle the nitric acid that's formed. Do you know of a better pipe, preferably flexible for up chimneys? Very curious to find that out because the darn pellet prices are ridiculous and I'd love to go with corn next winter.

tjnamtiw said:

What did you mean by 'do not mix pellet/corn with PVP'??? It looks like the better SS should handle the nitric acid that's formed. Do you know of a better pipe, preferably flexible for up chimneys? Very curious to find that out because the darn pellet prices are ridiculous and I'd love to go with corn next winter.

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From what I know of the Pellet Vent Pro, which is limited to what our dealer was telling us when we were shopping, the PVP pipe is the pipe that would be used on a multi fule stove. meaning if you wanted to burn corn rather than pellets. I have a Harman P61A and if I wanted could burn corn with a few modifications. The dealer insisted on using Pellet Vent Pro pipe when installing my stove.

tjnamtiw said:

What did you mean by 'do not mix pellet/corn with PVP'???

Click to expand...

I have the 3 inch corn vent pipe(33000 series) and I emailed Simpson on this. They said the New PVP is compatable with the older corn vent. But it has better seals at the joints.

I think Eric means is don't mix the Pellet vent system with the Pellet vent pro System. Only use one system to complete your install.

Snowy Rivers said:

The quad has an auger that is basically a spring and is designed to move the regular pellets up to the drop tube. The nuts shells are small enough that they dont propel upwards well and the fire is unstable.

Snowy

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Thanks, Snowy, I guess that idea is on the 'back burner'..........

I can confirm the differences between PelletVent (aka PV) and PelletVent Pro (aka PVP). The PVP has laser welded seams on at least the inner pipe, whereas the PV are only crimped. The PVP has an orange O-ring seal on outside of the inner pipe of each female end. All together these improvements make PVP a much better product that will prevent leaks. Remember the inner pipe carries exhaust, the outer pipe is just a heat shield.

According to Duravent support, they developed this product after pellet stove manufacturers boosted their exhaust blower CFMs several years ago, causing many smoke leaks. IMHO, they were actually copying what Excel has already done, maybe even Selkirk. I think the PV is now a substandard product they should simply drop altogether as there are too many issues with leaks. I would bet if you call several installers in your area and ask what is their preferred pipe, it will not be PV. I personally can attest to taking a bath on PV pipe and switching to Excel.

If you can buy PVP at wholesale I would save yourself much grief and cross PV off your list.

Was glad to see my dealer installed 3" PVP because I burn alot of corn. It really is a high quality vent thus very expensive. Its a piece of cake to undo at the tee for cleaning.

tjnamtiw said:

What did you mean by 'do not mix pellet/corn with PVP'??? It looks like the better SS should handle the nitric acid that's formed. Do you know of a better pipe, preferably flexible for up chimneys? Very curious to find that out because the darn pellet prices are ridiculous and I'd love to go with corn next winter.

Click to expand...

Flex Liner for Corn and other BioFuels:

BioFlex has been added to the PelletVent Pro (PVP) line for 2009 as a component. It is manufactured from SDV’s proprietary super-ferritic stainless steel. It
is used to line the masonry chimneys of appliances that can use biofuels. It is resistant to acids produced by corn and other biofuels. It is the only approved
flex liner for use with PVP male and female flex connectors. For more information on PVP please refer to pages 93 -110 of the product catalog.

BioFlex Pipe
Use when relining masonry chimney for use with biofuel
appliances. Made of super-ferritic stainless steel. Must be used
with PelletVent Pro Male and Female Flex Adapters. Rigid pipe
must be used when terminating system.

SIZE 15’ FLEX 20’ FLEX 25’ FLEX 30’ FLEX 35’ FLEX 100’ FLEX

3” 3PVP-15BF 3PVP-20BF 3PVP-25BF 3PVP-30BF 3PVP-35BF 3PVP-100BF

4” 4PVP-15BF 4PVP-20BF 4PVP-25BF 4PVP-30BF 4PVP-35BF 4PVP-100BF



Use when relining masonry chimney for use with biofuel appliances. Made of super-ferritic stainless steel. Must be used with PelletVent Pro Male and Female Flex Adapters. Rigid pipe must be used when terminating system.

PelletVent Pro is a venting system designed for stoves and inserts that use wood pellets and oil fuel. It is also built to vent biofuel products (corn, switch grass, cherry pits, soybeans, coffee husks, sunflower hulls, walnut shells and wheat). The systems perfect fit and finish is made possible with a laser-welded inner and outer wall for superior performance.

Other Flex Liner Alloys:

AL29-4C, while resistant to corrosion, is not recommended for temperatures at or above 600° F. Chimney
fires exceeding 600°F can occur in pellet chimneys as the result of unburned fuel residue collecting in
the chimney. At these temperatures, AL29-4C can become brittle, while Simpson Dura-Vent’s super-
ferritic stainless steel is stable and exceeds AL29-4C’s performance for venting corn and other biofuels