What Is a High Pressure Dome Top Bag Filter

Bag Filter July 4, 2025 Multi Bag Filter Housing

The core advantage of the dome-top (turtle-back) design lies in its pressure resistance. Standard bag filters typically withstand pressures up to 0.6 MPa, whereas the dome-top filter, with its arched cover structure, can handle high pressures ranging from 1.0 to 1.6 MPa. This is primarily due to its mechanical design—where the arched structure distributes axial force into circumferential stress, similar to the structural principle of an eggshell.

Dome-top bag filters are ideal for high-pressure applications, such as viscous fluid handling in chemical processes or high-pressure pre-treatment stages before reverse osmosis systems. When operating pressure exceeds 0.8 MPa, traditional filters are prone to flange leakage or vessel deformation, making the dome-top version a necessary choice.

However, there are notable drawbacks:

Higher cost due to thicker materials and specially formed stamping molds
Heavier weight, around 40% more than a standard filter of the same capacity
Reduced filtration area, as the arched cover reduces the number of filter bags within the same housing volume

Key Considerations for Selection:

Justify the investment only if your working pressure truly exceeds 0.8 MPa.
Viscosity should not exceed 5000 cP—excessive viscosity can cause a dramatic increase in pressure drop.
Use reinforced filter bags specifically rated for high-pressure conditions—standard bags are prone to rupture.