# Horizontal separator

> Horizontal gas, oil and water separators fabricated to your datasheet under ASME Section VIII, with B16.5 nozzles, and what the request needs.

URL: https://jjprojectsok.com/products/valves-process-equipment/horizontal-separator  
Español: https://jjprojectsok.com/es/products/valves-process-equipment/horizontal-separator  
Updated: 2026-10-16

Pressure vessel that separates gas, oil and water by gravity and internals, fabricated to a datasheet.

**In short:** Pressure vessel that separates gas, oil and water by gravity and internals, fabricated to a datasheet. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME Section VIII; nozzles per ASME B16.5.

## Specification references

- Standards: ASME Section VIII; nozzles per ASME B16.5
- Fabrication: To the buyer's datasheet and drawings
- Internals: As the process datasheet specifies
- Documents: Data book with drawings, certificates and test reports

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- Oil and gas production: separating gas, oil and water
- Gas conditioning, such as knockout and scrubbing upstream of compressors
- Pre-separation ahead of treatment and stabilization
- Slug handling at the inlet of processing facilities

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. Process datasheet: fluids, flow rates, operating pressure and temperature, and separation requirements
2. Design code, ASME Section VIII Division 1 unless stated, with design pressure and temperature and minimum design metal temperature
3. Size: inside diameter and tangent-to-tangent length, if set by the datasheet
4. Materials, corrosion allowance and any sour service requirement
5. Nozzle schedule with sizes, flange classes and facings
6. Internals: inlet device, mist eliminator, weirs, vortex breakers, as the process design requires
7. Code stamp, inspection and testing, third-party inspection, painting, and the data book content

[Request this item](https://jjprojectsok.com/request-a-quote?item=horizontal-separator)

## Questions

### When is a horizontal separator chosen over a vertical one?

A horizontal vessel has a large gas-liquid interface and is common where liquid volume is large, for three-phase separation or foaming service. A vertical vessel suits high gas-to-liquid ratios and limited plot space. The process engineer makes that call in the datasheet.

### Do you design the separator?

Fabricated equipment is sourced from fabricators to your datasheet and drawings. Sizing and process design come from your datasheet, and detailed mechanical design is done under the code by the fabricator, as the request defines.

### What documents come with a pressure vessel?

Typically a data book with approved drawings, material certificates, welding and inspection records and test reports. The content is agreed in the request and written into the purchase order.

## Related items

- [Shell-and-tube heat exchanger](https://jjprojectsok.com/products/valves-process-equipment/shell-tube-exchanger): Shell-and-tube heat exchangers fabricated to your thermal datasheet to TEMA and ASME Section VIII, and what the request needs, by TEMA type and tubes.
- [Weld neck flange](https://jjprojectsok.com/products/steel-structural/flange-weld-neck): Forged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.
- [Gate valve](https://jjprojectsok.com/products/valves-process-equipment/gate-valve): Steel gate valves to API 600, API 602 and ASME B16.34, tested to API 598, with the specification references and what a gate valve request should include.
- [Centrifugal pump](https://jjprojectsok.com/products/electrical-instrumentation/centrifugal-pump): Centrifugal process pumps to API 610 and ASME B73.1, supplied to your datasheet, and what a request needs: fluid, flow, head, NPSH available and materials.

## Guides

- [Industrial procurement process, step by step](https://jjprojectsok.com/knowledge/industrial-procurement-process): How industrial procurement works, step by step: requirement, RFQ, bid tabulation, evaluation, award, PO, expediting, inspection, logistics and delivery.
- [How to write an RFQ for industrial materials](https://jjprojectsok.com/knowledge/how-to-write-an-rfq): What an RFQ for industrial materials must specify: item, size, schedule or class, grade, standard, quantity, MTRs, inspection, packing and Incoterm.
- [Material test reports (MTRs) and EN 10204](https://jjprojectsok.com/knowledge/material-test-reports): What a material test report contains, how EN 10204 types 2.1, 2.2, 3.1 and 3.2 differ, what heat numbers mean, and what to check against the purchase order.

[All valves and process equipment](https://jjprojectsok.com/products/valves-process-equipment)