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TANK LEVEL ALARM
TANK VENT CAP

The PLASTIC MUSHROOM STYLE TANK VENT CAP, or tank breather cap, keeps out debris, insects, seeds, and rain while allowing tanks to properly vent. All plastic construction is corrosion proof.

PLASTIC TANK VENT CAP

All Plastic Tank Vent Cap or tank breather cap is all plastic and therefore corrosion-proof. Allows containers to vent while screening out debris, airborne seeds, and insects. PVC body with polypropylene screen.

Prevents containers from collapsing under partial vacuum, or building pressure during filling. Mushroom style plastic vent cap prevents falling dirt from clogging the screen and prevents rain water from entering tank. These mushroom style breather vents are suitable for washdown duty. Used for roof vent stacks, air intakes, venting equipment cabinets, exhaust pipes and more.

Available in any standard NPT fitting sizes 1/2" fitting size and larger - male thread, female thread or slip fitting. All sizes up to 6" are in stock.

Screen size:

  • Standard polypropylene mesh size is 17x17 strands per inch for sizes 2" and under, and 10x10 strands per inch for 3-6" sizes, and perforated PVC sheet for 8" size.
  • 17 x 17 mesh complies with FDA regulations for potable water storage.

DLL-55G HAS PVC PIPE

SCREENED VENT CAP
IMG0297

SIZES 1/2" to 8"

VENT CAP CUTWAY VIEW

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SPECIFICATIONS

  • Material (housing)...................................PVC, schedule 40
  • Screen mesh material............................ polypropylene
  • Screen mesh size (2" and smaller).........17x17 mesh
  • Screen mesh size (3-6")..........................10 x 10 mesh
  • Screen mesh size (8").............................1/8" PVC with" 0.125" dia. holes
  • Open area................................................40% (all sizes)
  • Maximum temperature..............................150F (65C)
IMG1221

8" SIZE WITH SHEET

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VENT CAP
Choose model from list below:

Pipe Size
Mounting Type

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How to Order
InStock
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Mesh SIZE SCALE

MODELS & DIMENSIONS Download

SLIP COUPLING DIMS. Download

MALE TERMINAL DIMS. Download

PVC FITTING CERT. Download

FEMALE ADAPTER DIMS. Download

CAP CERTIFICATION Download

How much air flow the vent caps are capable of, is a common question. The amount of flow through the vent cap depends not only on the size of the vent cap, but on the pressure in the piping system or tank, and the flowrate. The amount of resistance to flow introduced by the vent cap can be conveniently expressed as the pressure drop equivalent to a length of the same diameter pipe.

Table 1 shows the equivalent pipe length for various vent cap sizes. For example, resistance for a 4" cap is is equivalent to 30 ft. of straight pipe.

To get an ideaof airflow reduction for this same 4" pipe, using the 30ft equivalent length, the top curve on chart 1 ( marked HP220) shows the volume of) air reduction depends on the existing flowrate. If the existing flowrate is 200 CFM, then a 30 ft equivalent length would reduce the flowrate to approximately 180 CFM.

For more detailed calculations, a pressure drop cacluator is available here.

PIPE SIZE (inch)

FEET OF PIPE (Ft)

1

5.2

1.25

6.6

1.5

7.4

2

8.5

3

19

4

30

6

85

PIPE SIZE VS EQUIVALENT LENTH OF PIPE

Airflowfor3and4inchpipes

AIR FLOW CURVES FOR 3" AND 4" PIPE SIZE

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