In the manufacturing of stainless steel pressure vessels, bolts and nuts are critical connecting components whose quality directly impacts equipment safety and service life. To enhance production standards, our technical team has conducted an in-depth analysis of the selection, installation, and maintenance of bolts and nuts. Key insights are summarized below:

1. Material Selection

Stainless steel pressure vessels typically require corrosion-resistant, high-strength bolts and nuts (e.g., 304 or 316 stainless steel) to ensure stability under high temperature, high pressure, and corrosive environments. Special alloys or materials may be selected based on design requirements for extreme conditions.

2. Installation Guidelines

· Preload Control: Use torque wrenches to apply preload according to specifications, avoiding over-tightening (which may damage threads) or under-tightening (leading to sealing failure).

· Lubrication: Apply anti-seize compound or lubricant to threads before installation to reduce friction and extend service life.

· Symmetrical Tightening: Follow a crisscross or symmetrical sequence to ensure even flange pressure distribution and prevent leaks.

3. Common Issues & Solutions

· Thread Galling: Caused by material similarity or insufficient lubrication; prevent by using dissimilar hardness materials or lubricants.

· Loosening: Use lock washers or thread-locking adhesives, combined with regular inspections.

Our factory remains committed to refining bolt and nut standards, delivering safer and more reliable pressure vessels to our clients.