Technical Exchange: Selection and Installation Standards for Bolts and Nuts

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 torquewrenches to apply preload according to specifications, avoidingover-tightening (which may damage threads) or under-tightening (leading tosealing failure).

-Lubrication: Apply anti-seizecompound or lubricant to threads before installation to reduce frictionand extend service life.

-Symmetrical Tightening: Follow acrisscross or symmetrical sequence to ensure even flange pressuredistribution and prevent leaks.

3. Common Issues & Solutions

-Thread Galling: Caused by materialsimilarity or insufficient lubrication; prevent by using dissimilarhardness materials or lubricants.

-Loosening: Use lock washers orthread-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.

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