Torqbolt has gained a market reputation for supplying and manufacturing Offshore and Subsea Bolting. Low Temperature and Sour Service Environments are some of the areas of Offshore Bolting which requires compliance with Pressure Equipment Directive (2014/68/Eu) and NORSOK requirements. American Standard of Mechanical Engineers (ASME) has recommended special grades for Offshore & Subsea Bolting.
| Fastener Type | Material | Specification | H2S | Size |
|---|---|---|---|---|
| Bolts and studs | Low Alloy steel | ASTM A320 L7 | No | Up to М65 & 2.5" |
| Bolts and studs | Low Alloy steel | ASTM A320 L7M | Yes | Up to М65 & 2.5" |
| Nuts | Low Alloy steel | ASTM A194 7M | Yes | Up to М65 & 2.5" |
| Bolts, studs, nuts and washers | Low Alloy steel | ASTM A320 L43 | No | Up to M100 & 4" |
| Bolts, screws, pins, studs | Austenitic corrosion Resistant Stainless steel | EN ISO 3506-1 А4-80 | Yes | М6 to М16 |
| Nuts | Austenitic corrosion Resistant Stainless steel | EN ISO 3506-2 А4-80 | Yes | М6 to М16 |
| Bolts, nuts, washers | Austenitic corrosion Resistant Stainless steel | ASTM A453 Gr. 660D | Yes | No restrictions |
| Bolts | Nickel Alloy | ASTM F468M UNS N06625 | Yes | No restrictions |
| Nuts | Nickel Alloy | ASTM F467 UNS N06625 | Yes | No restrictions |
| Bolts, nuts | Nickel Alloy | API 6ACRA3 UNS N07718 | Yes | No restrictions |
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Fasteners with Special Coatings are used for Subsea & Offshore Applications where the Bolting is subjected to a highly corrosive environment.
The following Surface Treatments are used for Subsea Bolting: