SS 304 Cap

QS Pipe Fitting: Yuyao SS 304 Cap

SS 304 pipe cap with STD wall and a butt weld end to ANSI B16.9, corrosion resistant for closing petroleum pipeline ends.

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One-Minute Overview

SS 304 stainless cap for closing the end of a pipeline.
60*2.5 mm, STD wall, butt weld end, to ANSI B16.9.
Corrosion resistance feature for demanding environments.
Sizes, schedules and certificates are confirmed per inquiry.

A pipe cap closes a line for good, and the closed face carries the full line pressure with no gasket to help. This SS 304 cap is the 60*2.5 mm size with STD wall and a butt weld end, made to ANSI B16.9 so the outside diameter, the wall and the bevel match the pipe it seals. Stainless SS 304 brings corrosion resistance, which is why it is chosen for petroleum line ends on outdoor racks and in aggressive atmospheres where plain carbon steel would need far more attention. Because the cap is a blind end, the weld is the whole story once the system is live. Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

Name: SS 304 Cap
Material: SS 304
Standard: ANSI B16.9
Thickness: STD
End: Butt Weld
Size: 60*2.5 mm
Feature: Corrosion Resistance
Usage: Petroleum Pipeline
Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

A cap is the simplest fitting on a spool and the least forgiving once the line is live, because the closed face takes the full pressure with no gasket to help. On this SS 304 cap the 60*2.5 mm size, STD wall and butt weld end are built to ANSI B16.9, so confirm the outside diameter and the wall of the pipe it seals before ordering and check the bevel against the welding procedure. The stainless grade gives corrosion resistance in outdoor racks and aggressive atmospheres, which is why it is chosen for petroleum line ends. Keep the cap in a compatible material group with the run pipe, and remember that diameters in inches are often how the line is described even when the drawing is metric.

Welding a cap is a full-penetration joint on a closed end, so heat goes in but has nowhere to vent. Align the cap square, leave the root gap the procedure calls for, tack in two places and check squareness before the root pass, then cap with controlled heat input and let it cool slowly. Do not strike an arc on the crown and do not use the cap as a lifting lug. Hydrotest the section to the project pressure, inspect the bead all the way round and confirm the grade stamping. Sizes, wall thicknesses and schedules are confirmed per inquiry, so ask for the specification sheet and keep the material certificate with the spool records.

FAQ

Q1. What has to match the pipe before ordering a butt weld cap?

Three things: the nominal size against the actual outside diameter, the STD wall against the pipe schedule, and the bevel preparation against the welding procedure. Add the material group so the weld metal and any heat treatment stay consistent, and state the test pressure, because the blind face carries the full load and that sets the wall detail.

Q2. Is the stainless grade a reason to skip the hydrotest?

No, the test is about the weld, not the corrosion resistance. A full-penetration joint on a closed end still has to prove it holds at the project pressure. Hydrotest the section, inspect the bead around the whole circumference and keep the record with the spool paperwork, stainless or not.

Q3. Can I tack the cap on crooked and fix it while welding?

You can try, and the grinder will be delighted. A cap that starts out of square tends to stay that way, because there is no open end to correct the angle against. Tack in two places, check squareness, then weld; a minute with a square beats an afternoon of rework on a closed head.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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