Laboratory piping engineeringThe renovation should revolve around safety, functionality, and standardization. The specific steps and key points of the renovation are as follows:

1、 Preliminary preparation and requirement analysis

Conduct a comprehensive inspection of the existing pipelines

Evaluate the corrosion resistance, pressure resistance, and aging degree of pipeline materials (such as stainless steel, polyvinyl chloride, etc.) to determine the scope of replacement.

Check the sealing of pipeline connection methods (welding, threaded connections, etc.) and identify leakage risk points.

Analyze whether the existing layout complies with the experimental process to avoid cross contamination and safety hazards.

Clearly define the transformation objectives

Determine the gas/liquid type, flow rate, and pressure requirements based on the laboratory type (such as chemistry, biology, physics).

For example, corrosive gases require the use of corrosion-resistant pipes, while high flow gases require an increase in pipe diameter.

2、 Material selection and process design

Selection of pipes and fittings

Gas pipeline: Stainless steel (such as 316L), copper pipes and other corrosion-resistant materials should be preferred, and galvanized pipes (which are prone to rusting) should be avoided.

Liquid pipeline: Select materials such as polypropylene (PP) and polytetrafluoroethylene (PTFE) based on the properties of the medium.

Valves and instruments: Select high-precision pressure gauges, flow meters, and leak detection devices with alarm functions.

Layout optimization and process specifications

Pipeline routing: Following the principle of "short straight and few bends" to reduce resistance and leakage risks; The gas pipeline needs to be inclined upwards (slope ≥ 1:100) to prevent the backflow of condensate.

Support and fixation: Install pipe clamps every 1.2-1.5 meters, install sleeves at wall penetrations, and fill gaps with non combustible materials.

Identification system: Mark the gas composition, concentration, flow direction, and pressure level on the pipeline for easy operation and maintenance.

3、 Key control points during the construction phase

Pipeline installation and welding

Cutting and bending: Use specialized pipe cutters or benders, and manual operation is strictly prohibited; After cutting, clean gas should be used to blow away impurities inside the tube.

Welding process: During automatic welding, argon gas should be filled inside the tube for protection to prevent oxidation; Perform X-ray or ultrasonic testing after welding to ensure no defects.

Sealing treatment: Sealing tape or anaerobic adhesive is used for threaded connections, and metal gaskets are used for flange connections and bolts are uniformly tightened.

Safety and environmental protection measures

Construction protection: During high-altitude operations, fix ladders or scaffolding, wear safety helmets, safety shoes, and gas masks (if toxic gases are involved).

Waste disposal: Classify and recycle waste pipes, and carry out harmless treatment of materials containing chemical pollutants.

4、 Acceptance and post maintenance

Strict acceptance criteria

Pressure test: Conduct a pressure holding test with high-purity nitrogen at 1.2-1.5 times the working pressure for 24 hours without any leakage, which is considered qualified.

Cleanliness verification: Inspect the interior of the pipeline by wiping it with an endoscope or white cloth to ensure that there are no impurities such as welding slag or oil stains.

Document archiving: Organize construction drawings, inspection reports, and operation manuals, and establish digital twin models of pipelines (if conditions permit).

Intelligent maintenance management

Regular inspection: Check the corrosion status of pipelines, valve flexibility, and clarity of identification every quarter.

Preventive maintenance: Develop replacement cycles for vulnerable parts (such as sealing rings) and monitor pressure and flow parameters in real-time using the SCADA system.

Emergency plan: Develop emergency response procedures for gas leaks, pipeline ruptures, and other accidents, and regularly organize drills.

5、 Typical Case Reference

Semiconductor laboratory renovation: A certain enterprise has increased the yield rate of its production line from 92% to 98% by replacing high-purity stainless steel pipes and introducing an AI leak prediction system, saving over 5 million yuan in annual costs.

Biosafety Laboratory Upgrade: Adopting a double-layer pipeline design (inner transmission medium, outer vacuum pumping), combined with a negative pressure control system, to achieve zero leakage in high-risk pathogen operation areas.