MEC/Mechanical/TBT-MEC-002

Pipe Fitting and Flange Safety

MEICA Works › Mechanical › Pipe Fitting and Flange Safety

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Pipe fitting involves cutting, threading, welding, and connecting pipes and flanges for mechanical and process systems.
Flange connections use bolted joints with gaskets to create seal-tight connections in pressurised pipework systems.
Incorrect flange bolt tightening causes leaks, joint failure, and uncontrolled release of pressurised fluids or gases.
Pipe cutting with disc cutters, reciprocating saws, and oxy-fuel equipment generates sparks, noise, and sharp edges.
Heavy pipes and flanges require mechanical lifting — manual handling of large-bore pipework causes serious injuries.
Pressure testing of completed flanged connections requires exclusion zones and controlled pressure build-up procedures.
Hot work including welding and brazing on pipe systems requires permits and fire prevention measures.
LOTO procedures must be followed before breaking into any existing pressurised or process pipework system.
Flange alignment tools and spreaders must be used to prevent fingers and hands being trapped between flange faces.
Pipe supports and hangers must be installed before pipework is loaded to prevent unsupported spans causing failure.

Joint failure	A leaking flange on a pressurised system releases fluid with dangerous force — correct bolt tightening prevents catastrophic failure.
Trapped hands	Fingers and hands trapped between heavy flange faces during alignment cause crush injuries and amputations.
Stored energy	Breaking into live pipework releases pressurised contents violently — LOTO and isolation must be confirmed before any work.

Don't

Follow the torque sequence and values specified for each flange bolt connection.
Use flange alignment tools to position flanges — never use your fingers between faces.
Install pipe supports and hangers before loading pipework onto the bracket system.
Use mechanical lifting for heavy pipes and flanges that exceed safe manual handling limits.
Obtain a hot works permit before welding or brazing any pipework on site.
Follow LOTO procedures before breaking into any existing pressurised pipe system.
Establish exclusion zones during pressure testing of completed pipework installations.
Wear cut-resistant gloves and eye protection when cutting or handling pipe sections.
Check gasket type and specification match the design before assembling flange joints.
Inspect completed joints and record torque values as required by the inspection plan.

DON'T tighten flange bolts without following the specified torque sequence and values.
DON'T place fingers between flange faces during alignment — use the correct tools.
DON'T load pipework onto brackets before supports and hangers are installed.
DON'T manually handle heavy pipes when mechanical lifting equipment is available.
DON'T weld or braze pipework without a valid hot works permit in place.
DON'T break into pressurised systems without confirmed LOTO isolation procedures.
DON'T stand near pipework during pressure testing — stay outside the exclusion zone.
DON'T handle cut pipe ends without gloves — sharp edges cause deep lacerations.
DON'T use incorrect gasket types — mismatched gaskets cause joint leaks under pressure.
DON'T cover flanged joints before inspection and torque records are completed.

See also: MEICA Safety Awareness | Pressure Testing Safety

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