Planning a storage or terminal project means every component has to fit your tank, not a catalogue. Before you request a custom tank vent valve quote, gathering the right service data helps you receive an accurate, standards-compliant proposal on the first attempt. This guide walks you through exactly what to prepare.
Start with the fundamentals of your installation. You should note the tank type — fixed-roof, floating-roof, or pressurized — together with the stored medium, its working temperature range, and the design pressure and vacuum the system must withstand. Capture the maximum inflow and withdrawal rates as well, because these directly drive the breathing demand.
As storage and terminal capacity keeps growing across petrochemical, biofuel, and LNG applications, the range of tank layouts engineers specify has widened. A clear picture of your basic service conditions therefore saves both sides time during the quotation stage.
The checklist below summarises the core data points most proposals rely on:
| Information | Why it matters |
|---|---|
| Tank type (fixed / floating-roof / pressurized) | Determines venting philosophy and set-pressure range |
| Stored medium | Drives material and flame-arrester decisions |
| Working temperature range | Sets seal and body material limits |
| Design pressure and vacuum | Defines the relief set points |
| Maximum inflow / withdrawal rate | Establishes required breathing capacity |
| Tank capacity and dimensions | Supports API 2000 vent sizing |
With the service conditions clear, you can specify the valve itself. State the required breathing (venting) capacity, the pressure and vacuum set values, the connection size, and the flange standard you intend to use. Body and sealing materials deserve particular attention — common choices run from carbon steel to stainless grades, and the right pairing protects against the medium you store.
If you are comparing options, our pressure vacuum relief valve selection guide for storage tanks explains how set points and capacity interact in practice. Because breather valve specifications vary so widely between projects, stating your preferred standard — for example API 2000 or ISO 28300 — helps us match the proposal to your engineering basis.
Standard drawings rarely tell the whole story. Tell us about corrosive or abrasive media, whether the valve sits outdoors or in a low-temperature environment, and if you need an integrated flame arrester. Many storage projects now pair a breather valve with integrated flame arrester to consolidate tank protection into a single flange face. You can review our flame arresters to see how element grades and housing options are matched to gas groups.
Certification requirements also matter. ATEX, IECEx, or a specific client specification should be stated up front so the quotation reflects the correct documentation and testing. The same applies to any bespoke request under breather valve customization — the earlier we understand the constraint, the tighter the proposal.
With the points above clarified, assemble the documents that let our engineers respond precisely. A tank data sheet, interface (nozzle) drawings, the model of any existing equipment you plan to keep, and the relevant project technical specification form the ideal starting set. If some values are still open, you do not need to wait — submit the data you have and we will confirm which remaining parameters are required before finalising the design.
For a deeper look at the calculation behind set points, our API 2000 tank vent sizing guide walks through the workflow step by step. Zhenchao designs and manufactures tank venting, pressure and vacuum relief, and flame protection equipment for storage, petrochemical, and energy projects worldwide. As an experienced breather valve manufacturer, we review your data sheet directly with our engineering team rather than routing it through a generic reseller.
Send us your tank data sheet and service conditions, and Zhenchao’s engineering team will return a tailored, standards-compliant proposal — usually within a few working days. As a trusted tank vent valve supplier, we turn your specifications into a build-ready design.
Turnaround depends on complexity, but for a complete tank data sheet and clear specifications, most proposals are returned within a few working days. Non-standard sizes, special materials, or third-party inspection add lead time, which we confirm before you place an order.
Yes. When you state both the venting standard (such as API 2000 or ISO 28300) and the hazardous-area certification in your inquiry, the design, documentation, and testing are aligned to satisfy both from the outset rather than as a late amendment.
In many cases, yes. If you share tank capacity, working temperature range, and fill or empty rates, our engineers can estimate the required breathing capacity using API 2000 methodology and propose suitable set points, then refine them once the full data sheet arrives.
Custom valves are built to common international flange standards, including ANSI/ASME, DIN, and JIS, across a wide pressure-rating range. Stating your flange standard and nominal size in the inquiry ensures the nozzle matches your existing piping without field modification.
Material choice follows the stored medium and temperature envelope. For aggressive or low-temperature duty we specify appropriate stainless grades, special seals, and protective treatments, and we can advise on the most cost-effective pairing during the quotation review.
Yes. For projects that require it, we can arrange mill test reports, hydrostatic and seat-leakage testing, and independent inspection by recognised agencies. Mention these needs in your inquiry so they are reflected in both the proposal and the lead time.
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