Quick Answer
A useful bag filter housing quotation starts with the process conditions, not only a housing photo or a request for “one stainless steel filter.” Prepare the service liquid, filtration objective, target flow, operating and design conditions when known, bag size and quantity, housing material request, connection details, seal requirements, installation layout, quantity, and available drawings or photographs.
Single-bag and multi-bag housings are not selected by one universal flow threshold. The correct path depends on the complete system, including liquid properties, solids loading, filter-bag media and micron rating, acceptable pressure drop, operating schedule, installation space, maintenance approach, and project requirements. Go2Filter can review the information supplied and identify questions that must be resolved before a configuration and commercial terms can be quoted.
Start With the Filtration Duty
Describe what the filtration step is expected to do. State the service liquid and any known chemistry or concentration, the contaminant or solids of concern, the filtration objective, and the downstream equipment or process being protected. If the request replaces an existing housing, explain the current problem: difficult sourcing, leakage, short bag life, excessive changeout frequency, pressure rise, capacity limits, corrosion concern, layout constraint, or another documented issue.
Provide the current filter-bag media and micron rating when known. Preserve the source wording for nominal or absolute rating. A housing quotation should not assume that a different bag size, finer rating, or larger housing will solve a process problem without reviewing the liquid, solids, media, flow, pressure drop, and operating pattern.
If the application involves regulated service, cleaning chemicals, sanitation, hazardous materials, unusual temperature, or project-specific documentation, list those requirements before quotation. Do not assume that a general material name establishes final suitability.
Single-Bag or Multi-Bag: What Changes the Review?
A single-bag housing may be reviewed when the required capacity, installation space, operating pattern, and maintenance plan can be served by one compatible bag and basket. A multi-bag housing may be reviewed when the project needs more total filtration area, higher system capacity, a different changeout pattern, or a larger solids-handling path.
These are review directions, not automatic rules. The number of bags should be evaluated with the target flow, liquid viscosity, solids loading, selected media and micron rating, allowable clean and terminal differential pressure, service interval, available footprint, cover access, lifting and maintenance constraints, and the number of housings in service or standby.
| Buyer question | Why it matters to the quote |
|---|---|
| What is the normal and peak flow? | Helps define the capacity that the housing arrangement must be reviewed against. |
| Is the process continuous or batch? | Affects operating pattern, maintenance planning, and whether standby capacity is relevant. |
| What solids are present and at what loading? | Influences bag loading and the expected changeout discussion. |
| What bag size and media are currently used? | Helps establish the existing filtration area, basket fit, and replacement path. |
| Is installation space limited? | Affects vessel count, cover opening, basket removal, pipe orientation, and service access. |
| What changeout pattern is acceptable? | Helps compare one larger arrangement with multiple smaller units or other system options. |
Do not state a fixed maximum flow, pressure rating, or service life for a housing family without an approved drawing or product-specific data. Final design and operating limits must be confirmed for the proposed configuration.
Confirm Bag Size, Basket, and Seal Interface
State the intended filter-bag size and the number of bags per housing. Size #1 and Size #2 are common descriptions, but the label alone is not enough to confirm fit. Provide actual bag diameter and length, ring or collar style, basket dimensions, sealing arrangement, and the current housing model when available.
For a replacement request, useful evidence includes:
- the housing manufacturer, model, and nameplate;
- a full side view of the housing;
- cover, clamp, bolt, hinge, or closure details;
- inlet, outlet, drain, and vent locations;
- basket diameter and length;
- current bag diameter, length, ring or collar, media, and micron rating;
- seal or gasket location and documented material;
- an old drawing, purchase specification, invoice, or part number; and
- photographs of the installed piping and available maintenance space.
Photographs can support identification, but they do not establish pressure rating, wall thickness, material grade, seal chemistry, connection standard, or final fit. Mark unknown values clearly instead of estimating them as confirmed specifications.
Provide Flow, Pressure, and Temperature Data
Supply normal and peak flow with units. State whether the value is for one housing, a complete train, or the full process system. Include normal operating pressure and temperature, and provide design pressure and design temperature only when those values are already established in approved project documents.
If differential-pressure information is available, identify the clean or initial value, current operating value, and the site-approved changeout limit. There is no universal differential-pressure limit for every bag, housing, pump, and process. Final limits and procedures must follow the selected equipment documentation, system design, and site requirements.
Also identify whether operation is continuous or batch, whether flow can vary, whether the housing must remain online during maintenance, and whether redundancy or duty/standby operation has already been specified by the project.
Review Housing, Internal, and Seal Materials
Provide the requested housing material and the reason for that request when known. Housing, basket, support, fastener, seal, and other wetted materials should be reviewed against the complete service conditions.
Useful compatibility information can include:
- exact liquid or mixture;
- known additives and contaminants;
- concentration and pH where relevant;
- normal and maximum temperature;
- exposure time and operating pattern;
- cleaning, flushing, or sanitation chemicals;
- external environment or corrosion exposure; and
- any previous material or seal failure.
Do not identify a seal material from color or appearance. If the material is undocumented, mark it as unknown and provide the process information needed for review. Do not claim food, beverage, pharmaceutical, potable-water, chemical, or other regulated suitability without product-specific documentation and project confirmation.
Define Connections, Orientation, Drain, and Vent
State the inlet and outlet size, connection type or standard, and orientation. Note whether threaded, flanged, clamp, or another connection is required, but do not assume two connections with the same nominal size use the same standard or dimensions.
Include the desired or existing:
- inlet and outlet position;
- flow direction;
- drain location and connection;
- vent location and connection;
- pressure-instrument connection, if already specified;
- cover or closure preference;
- support legs, mounting, or skid requirement;
- lifting or handling provisions, if required by the project;
- overall footprint and height limits; and
- clearance needed to open the cover and remove the basket and bag.
A simple marked-up sketch can be more useful than a verbal description. Show pipe direction, nearby equipment, floor or skid location, overhead clearance, maintenance aisle, and any fixed connection points.
Bag Filter Housing RFQ Worksheet
Leave unknown fields blank or mark them unknown. Do not invent a value to complete the table.
| Group | Information to provide | Buyer entry |
|---|---|---|
| Project | New system or replacement | |
| Project | Quantity and delivery destination | |
| Duty | Service liquid and known chemistry | |
| Duty | Contaminant/solids and filtration objective | |
| Duty | Continuous, batch, duty/standby, or other pattern | |
| Flow | Normal and peak flow, with units | |
| Pressure | Normal operating pressure, with units | |
| Design | Design pressure and design temperature, if approved | |
| Temperature | Normal and maximum operating temperature | |
| Differential pressure | Clean/current/changeout values, if documented | |
| Bags | Bag size, quantity per housing, dimensions | |
| Bags | Media and micron rating; nominal/absolute wording | |
| Interface | Ring/collar, basket, and sealing details | |
| Materials | Housing and internal material request | |
| Seals | Seal material, if documented | |
| Connections | Inlet/outlet size, standard, and orientation | |
| Accessories | Drain, vent, instrument, support, or skid requirements | |
| Layout | Footprint, height, piping, and maintenance clearance | |
| Evidence | Nameplate, photos, drawings, old specifications, sample | |
| Documentation | Required drawings, certificates, inspections, or records | |
| Commercial | Requested quantity, packaging, destination, and timing |
What If Some Information Is Missing?
Send the evidence you have. An existing model, nameplate, photographs, basic dimensions, liquid, flow, pressure, temperature, bag information, and quantity can establish a starting point. Clearly distinguish measured, documented, estimated, and unknown information.
Go2Filter may request additional measurements, a drawing, photographs of specific interfaces, process details, or a sample. Incomplete evidence may limit whether a configuration can be quoted or whether further technical confirmation is required.
Frequently Asked Questions
Is a multi-bag housing always better for higher flow?
No. A multi-bag arrangement may be reviewed for greater total filtration area or capacity, but the correct configuration depends on the complete process, selected bags, allowable pressure drop, solids loading, operating schedule, layout, and maintenance plan.
Can a housing be selected from flow rate alone?
No. Flow is one input. Liquid properties, solids, media, micron rating, bag size and count, pressure, temperature, materials, connections, installation, and documentation requirements also affect the review.
Can I use any Size #1 or Size #2 bag in a housing with the same size label?
Not automatically. Confirm actual dimensions, ring or collar, basket, sealing interface, media construction, and the housing specification.
Can material compatibility be confirmed from the material name alone?
No. Review the exact process chemistry, concentration, temperature, pressure, exposure, cleaning conditions, seals, internal parts, and project requirements.
Do photos and drawings help with a replacement quote?
Yes. Nameplates, full-housing views, connection photos, cover and basket details, installation photos, drawings, and old specifications can reduce ambiguity. They do not replace final technical confirmation.
Can price, availability, freight, and lead time be confirmed from this page?
No. Commercial terms depend on the reviewed configuration, quantity, destination, documentation, and project requirements and must be confirmed during quotation.
Request a Bag Filter Housing Quote
Send the available process, sizing, material, connection, layout, documentation, and quantity details through the Go2Filter quote form. Attach or reference photographs and drawings when available.
CTA: Request a Bag Filter Housing Quote
For deeper technical background, review the Doctopfilter Bag Filter Housing Selection Guide. For related product paths, review Go2Filter Filter Housings and Liquid Filter Bags.
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