Output

Recommendation Report

Generated live from your inputs by the API 615 selection engine.

Inputs

Project

Tag: -

Service

General Hydrocarbon

Gas / Vapor

Size / Class

Line 6" | 300#

Isolation (On/Off)

Design

40 barg @ 120 deg C

Onshore - Open Air

Engineering Decision Support Tool - Screening / Internal Review Use unless independently validated.

Outputs are generated for engineering screening and decision support only. Final responsibility for standards compliance, engineering judgment, specification verification, and approved project use remains with the user organization and qualified reviewing engineer.

Selected valve specification

Recommended

Pressure class (override)

Pipe size (override)

Valve type: Ball Valve
Valve subtype: Trunnion Mounted — Reduced Bore
Body material: Carbon Steel
Body material spec: ASTM A216 WCB
ASME material group: Group 1.1 - Carbon Steel
B16.5 rating table: ASME B16.5 Table 2-1.1
B16.34 body basis: ASME B16.34 Table A-1 / material group cross-reference
Rating dataset: 2026.05-screening
App version: 0.4.0
Release ID: VSG-0.4.0-2026-05-screening
Readiness: Screening Only
Generated at: Pending client timestamp
Seat material: PTFE / RPTFE
Disc / Ball material: SS 316 + ENP
Stem material: SS 316 / 17-4 PH
End connection: Flanged (RF)
End connection std: ASME B16.5
Operator: Gear Operated
Gasket: Spiral Wound (SS 316 / Graphite) - ASME B16.20
Packing: PTFE / Flexible Graphite
Fire safe: Yes - API 607
Valve standard: API 6D / API 608
Face-to-face: ASME B16.10 / API 6D
Flange standard: ASME B16.5
Testing standard: API 598

Overrides summary

All recommended

No engineering recommendations have been overridden. The selected specification matches the engine output.

Alternatives & rejected options

Click an alternative to override the engine recommendation. The report and datasheet will regenerate using your choice.

Gate Valve

Cost-effective for clean service, multi-turn operation

Butterfly Valve

Lighter, space-saving for Class 150/300

Engineering rationale

valveType

Ball valve (trunnion mounted) is selected for mid-range sizes (3"–12"). At these sizes and pressures, a trunnion-mounted ball offloads seat loading via fixed trunnion supports, reducing operating torque and improving seat life. Full bore options give negligible pressure drop.

Rule: NPS 3"–12": Trunnion ball valve preferred — lower operating torque than floating ball at higher pressures and sizes.

API 615 §6.2API 6D §5.2API 608

bodyMaterial

Carbon steel WCB is the standard, cost-effective body material for general hydrocarbon and utility service within the temperature range -29 °C to 425 °C and applicable pressure class.

Rule: General service (-29 °C to 425 °C): WCB carbon steel — standard API/ASME material, good strength, weldability, and availability.

ASTM A216 WCBASME B16.34 Table A1API 615 §7.1

trim

PTFE (or glass-reinforced PTFE / RPTFE) seats are standard for ball valves in general service below 200 °C. PTFE provides low friction, chemical resistance, and reliable sealing. Electroless Nickel Plating (ENP) on the SS 316 ball improves hardness and corrosion resistance.

Rule: General service (T ≤ 200 °C, Class ≤ 600#): PTFE seats — standard soft-seat ball valve. ENP on ball improves hardness.

API 6D §6.3API 608 §6ASME B16.34

endConnection

Raised Face (RF) flanged ends are standard for Class 150–600#. The spiral wound gasket on the raised face provides reliable sealing with normal bolt loads. ASME B16.5 covers NPS ½" through 24".

Rule: Class 150–600#: RF flange with SWG — standard flanged joint. ASME B16.5 (≤ 24") or B16.47 (> 24").

ASME B16.5ASME B16.5ASME B16.20 (SWG)

operator

Gear operator required for larger quarter-turn valves (5"–12", Class 150–600). As valve size and pressure class increase, the seating/unseating torque rises rapidly. Gear operators (worm gear) multiply the input handwheel force by the gear ratio, making operation safe and practical. They also prevent sudden opening/closing.

Rule: Quarter-turn 5"–12", ≤ 600#: Gear operator — torque too high for lever. Worm gear ratio reduces required operating force.

API 6D §6.7ISO 5210 (Multi-turn actuator flanges)EN 12570

gasket

Spiral wound gasket (SWG) is the industry standard for process flanged joints. The alternating metal winding (SS 316) and filler (flexible graphite) provides resilience to bolt load relaxation, temperature cycling, and vibration. ASME B16.20 governs dimensions and performance.

Rule: Standard service: SWG per ASME B16.20 — resilient, resistant to temperature cycling and bolt relaxation. Do not substitute with sheet gaskets in process service.

ASME B16.20 §4API 615 §8.3ASME PCC-1

packing

PTFE or flexible graphite packing for general service. PTFE provides excellent chemical resistance and low friction. Flexible graphite is the alternative for steam or higher temperature service. Both are accepted in API 622 fugitive emission testing.

Rule: General service: PTFE or graphite packing — both acceptable. Specify per service conditions.

API 622ISO 15848-1 (Fugitive emissions type testing)API 615 §8.4

fireSafe

Fire-safe design required for quarter-turn valves (ball, butterfly, plug) in hydrocarbon or flammable fluid service. In a fire, the primary soft seat (PTFE) will burn away. A fire-safe valve has a secondary metal-to-metal seat or backup sealing to maintain shutoff after seat destruction, preventing escalation. API 607 defines the test procedure.

Rule: Hydrocarbon/flammable service with quarter-turn valve: Fire-safe design per API 607 mandatory — ensures shutoff if primary seat is destroyed by fire.

API 607 (Fire testing of quarter-turn valves)API 6FA (Fire test for valves)API 615 §10

bore

Reduced Bore (RB) is the cost-driven default for ball valve isolation. RB valves are typically 20–40% cheaper, lighter, and shorter face-to-face than full bore equivalents. The bore is one nominal size smaller than the line (e.g., 6" RB ball in an 8" line). Full Bore is only specified when an engineering requirement overrides cost: piggable lines, ESD/HIPPS safety function, subsea intervention cost, or pressure-drop critical service.

Rule: Ball valves: default Reduced Bore for cost. Override to Full Bore only on engineering requirement (piggable, ESD/HIPPS, subsea, dP-critical).

API 6D §5.2 (Bore classification)API 615 §6.2

Why this was selected

ASME B16.5 P-T check: Group 1.1 - Carbon Steel: 300# rated 44.2 barg at 120 deg C (screening factor 0.864; basis ASME B16.5 Table 2-1.1)

Learning moment

The recommended class comes from cross-referencing your design pressure against the B16.5 P-T curve at design temperature, plus a margin for upset. Going one class higher gives headroom but adds cost and weight; going lower risks derating below operating conditions.

ASME B16.5 caution

ASME B16.5 Caution: Design pressure (40 barg) is within 15% of the Class 300 Group 1.1 - Carbon Steel screening limit (44.2 barg at 120 deg C). Confirm final P-T rating against ASME B16.5 Table 2-1.1.

ASME B16.34 body check

ASTM A216 WCB maps to Group 1.1 - Carbon Steel; 120 deg C is within the screening range (-29 deg C to 425 deg C). Verify final body rating against ASME B16.34 Table A-1 / material group cross-reference.

Group 1.1 - Carbon Steel

ASME B16.5 Table 2-1.1; ASME B16.34 Table A-1 / material group cross-reference. 2026.05-screening; draft screening basis only - verify against licensed/current ASME tables.

User responsibility

API 615

Short reference used for screening logic. Verify final selection against the licensed/current standard and project specification.

API 598

Short reference for inspection and test basis. Verify test requirements against the licensed/current standard and project specification.

ASME B16.34

Short reference for valve body rating checks. Verify material grade and pressure-temperature rating against licensed/current tables.

Inputs

Engineering Decision Support Tool - Screening / Internal Review Use unless independently validated.