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Putian C4430 Insulating Spacer
QS Gasket: Putian C4430 Insulating Spacer
Name: Putian C4430 Insulating Spacer
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Quantity
C4430 Insulating Spacer—built to ASME B16.5, 4"150 lb rating—uses a core of Klingersil C-4430 non-asbestos sheet: aramid fibre reinforced with NBR binder, oil-resistant, temperature-resistant and highly resilient.
Each set is shipped with a G-10 insulating sleeve & washer plus ZPS metallic hardware, eliminating flange galvanic corrosion and thermal-cycling stress in one step and giving critical lines in petrochemical, offshore and LNG service long-term sealing together with electrical isolation.
How to tell whether a C4430 Insulating Spacer is damaged
Failure almost always shows up before the first visible drop. With the four on-the-spot steps"Look-Touch-Measure-Ask"an operator can make a 90 % correct call in 30 s, avoiding both blind re-tightening and sudden spray.
Failure almost always shows up before the first visible drop. With the four on-the-spot steps"Look-Touch-Measure-Ask"an operator can make a 90 % correct call in 30 s, avoiding both blind re-tightening and sudden spray.
The notes below give copy-ready quick tests by fluid condition and spacer type, plus photo-level field cases that any shift can match.
1. Look—three visual hot-spots
1) Peripheral leak line: a continuous dark trace (oil) or white bloom (steam) around the outside edge means fluid has already broken through the spacer's capillaries; a 360° ring shows full-circle loss of load—change out.
1) Peripheral leak line: a continuous dark trace (oil) or white bloom (steam) around the outside edge means fluid has already broken through the spacer's capillaries; a 360° ring shows full-circle loss of load—change out.
2) Blow-grooves: radial"fingernail"scratches across a graphite-composite C4430 Insulating Spacer show the graphite layer has been blown away, leaving only the serrated metal core and cutting rebound by >70 %.
3) Colour change / char: a rubber-type spacer that has turned black and cracked, or Klingersil C-4430 that has shifted from green to brown with lifted edges, tells you a short-term excursion above 200 °C has broken down the NBR; compression set is now >50 % and further tightening will only crush it.
2. Touch—two finger tests
1) Hardness check: press a fingernail into a new and into the old spacer; if the old one hardly marks it has"baked hard"and can no longer compensate for bolt creep.
2) Ply separation: flex the 3 mm overhang of the old spacer with long-nose pliers; if graphite and metal core part by ≥2 mm the inter-ply adhesive has carbonised and the sheet will delaminate and blow out on restart.
1) Hardness check: press a fingernail into a new and into the old spacer; if the old one hardly marks it has"baked hard"and can no longer compensate for bolt creep.
2) Ply separation: flex the 3 mm overhang of the old spacer with long-nose pliers; if graphite and metal core part by ≥2 mm the inter-ply adhesive has carbonised and the sheet will delaminate and blow out on restart.
3. Measure—two pocket tools
1) Feeler gauge: after a second pass of bolting to ASME PCC-1 sequence on a 150 lb flange, slide a 0.05 mm feeler around eight points; insertion ≥3 mm at any spot means the C4430 Insulating Spacer has collapsed or the bolts have no reserve—fit a thicker spacer or check flange parallelism.
1) Feeler gauge: after a second pass of bolting to ASME PCC-1 sequence on a 150 lb flange, slide a 0.05 mm feeler around eight points; insertion ≥3 mm at any spot means the C4430 Insulating Spacer has collapsed or the bolts have no reserve—fit a thicker spacer or check flange parallelism.
2) IR gun: a bolt-to-bolt temperature spread >30 °C on a steam flange shows uneven compression; the hot side is already eroded, while continuous dew on the cool side means an internal blow-path exists.
4. Ask—trace three service events
1) Pressure surges: find out if a hydro-test or pump trip raised hammer pressure to ≥1.5×design; PTFE cold-flows easily and will show a mirror-like extrusion band—check the C4430 Insulating Spacer first.
1) Pressure surges: find out if a hydro-test or pump trip raised hammer pressure to ≥1.5×design; PTFE cold-flows easily and will show a mirror-like extrusion band—check the C4430 Insulating Spacer first.
2) Galvanic attack: if, after six months, an insulating set (G-10 sleeve included) is opened and the flange face shows rust or a crescent-shaped metal loss, the sleeve is breached and isolation is lost—replace the complete kit.
3) Chemical compatibility: start-up of an amine-based sweetener followed by blistering or ply separation in an EPDM spacer means the material is incompatible; even without leakage upgrade the C4430 Insulating Spacer to FKM or PTFE-envelope style.
5. Thirty-second field demos
Case 1—4"150 lb hot-oil pump discharge from crude unit: patrol spotted a 5 mm-wide black oil line around a graphite-composite C4430 Insulating Spacer; 0.05 mm feeler slid 4 mm in, IR showed 28 °C bolt spread—rated as eroded, leak stopped after on-stream change-out.
Case 1—4"150 lb hot-oil pump discharge from crude unit: patrol spotted a 5 mm-wide black oil line around a graphite-composite C4430 Insulating Spacer; 0.05 mm feeler slid 4 mm in, IR showed 28 °C bolt spread—rated as eroded, leak stopped after on-stream change-out.
Case 2—2"900 lb insulating flange on LNG loading arm: three months in service a light frost appeared; teardown showed a 1 mm-deep arc-burned groove on the spacer ID and a carbonised G-10 sleeve face caused by a loose jumper cable—leak cured after fitting a full new C4430 Insulating Spacer isolating set and re-securing the jumper.
Master the Look-Touch-Measure-Ask routine, keep the typical cases in mind, and any operator can health-check a C4430 Insacting Spacer in 30 s—killing leaks at the very first drop.
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