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| API-16A Temperature | |
| Classification | Operating Range (°F) |
| T-75 | -75 to 250 |
| T-20 | -20 to 250 |
| T- 0 | - 0 to 250 |
| Connectors | Material Designation | API Minimum HBW | NACE Maximum HBW |
| 6B Weld Flanges | 45K | 140 | 237 |
| Integral Flanges and Hubs, and 6BX Weld Neck Flanges. | 60K* | 174* | 237 |
| 75K* | 197* | 237 |
* 75K material can substitute for 60K material
| API-6A TEMPERATURE CLASSIFICATION | |||
| Temperature Classification | Operating Range Degrees Fahrenheit °F | ||
| Min | Max | ||
| K | -75 | 180 | |
| L | -50 | 180 | |
| N | -50 | 140 | |
| P | -20 | 180 | |
| R | Room Temperature | ||
| S | 0 | 140 | |
| T | 0 | 180 | |
| U | 0 | 250 | |
| V | 35 | 250 | |
| X** | 0 | 350 | |
| Y** | 0 | 650 | |
Designated material property requirements for bodies, bonnets and end and outlet connections
| Material Designation | 0.2% Yield Strength min.(psi) | Tensile Strength min.(psi) | Elongation in 50 mm (2 in) min.% | Reduction in Area min.% |
| 36K | 36,000 | 70,000 | 21 | Not Required |
| 45K | 45,000 | 70,000 | 19 | 32 |
| 60K | 60,000 | 85,000 | 18 | 35 |
| 75K | 75,000 | 95,000 | 17 | 35 |
| MATERIAL | MARKED | MAX. HBW |
| Soft Iron ** | D-4 | 103 |
| Low Carbon Steel | S-4 | 121 |
| 304 Stainless Steel | S-304-4 | 158 |
| 316 Stainless Steel | S-316-4 | 158 |
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Blind flange:Used to close off completely a flanged end or outlet connection. Can be use to stop the Flow in any directions. API Specified 6B Weld Neck Flanges:have restricted bores to match standard pipe sizes and schedules. API Spec 6A Specified, 6 BX Weld Neck Flanges, have material and dimensions that conform to the requirements for full bore integral flanges. Customers can specify weld neck length as per their requirements Test Flange:A hole drilled and tapped into a Blind or Target flange which may allow application or pressure or attachment of a gauge. Adapter Flanges:Double studded adapter flanges, companion flanges, flange with union adapters. It can be use for transition in nominal size and/or pressure rating. |
The difference between ASME/ANSI and API flanges is the fabrication material and the higher rated API operating pressure.
ASME/ANSI flanges are common in industrial process systems handling water, steam, air and gas.
API flanges are manufactured for high strength operating refinery systems with products such as oil and explosive gases.
The flange standards API 6A and ASME/ANSI B16.5 are similar dimensionally - but the API 6A flanges are rated for higher
| NMT Engineering & Services manufactures Drilling Spools and Spacer every size and pressure rating. |
| Drilling Spools usually have the same nominal end connections and the nominal Outlet connections. |
| While Spacer Spools may have different connections. The studded or flanged. |
| Customers may specify any combination of end connections and outlet connections, as well as overall height or length and outlet extension. |
| All Drilling Spools & Spacer Spools are designed to have adequate accommodate wrenches, studs and nuts. |
Manufactured as per API-6A PSL-1 thru PSL-3. Sour Service is available and conforms to the latest NACE specifications.
Ring Grooves can be inlayed with a variety of stainless steels and high Nickel Alloys.
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