Hydraulic Hose for Mining Equipment

No. All four codes are 35.0 MPa (350 bar) with 140.0 MPa minimum burst, from the 19 mm bore to the 38 mm bore. Bore changes the flow, the bend radius and the weight, but not the pressure class.

Flow, arc and mass, not pressure. The 1 inch code runs a 300 mm arc at 2.12 kg/m, while the 1-1/2 inch code needs 500 mm and weighs 5.49 kg/m. Both are rated 35.0 MPa with the same 140.0 MPa burst.

Not at 350 bar with a shock duty. The R13 body is four spiral layers at 140.0 MPa burst, and a two-braid body of the same bore sits a pressure class lower. On a loader lift line that is the difference between a service interval and a failure.

The 19 mm code takes a 240 mm minimum bend radius on a 31.0 to 33.2 mm outside diameter. At 1 inch it is 300 mm, at 1-1/4 inch 420 mm and at 1-1/2 inch 500 mm, so upsizing costs routing space on a machine that is already crowded.

Because the wall and the bore both grow. The 38 mm code runs 5.49 kg/m against 1.36 kg/m at 19 mm, and the outside diameter goes from 31.0 mm to 58.8 mm. Above 1-1/4 inch the run needs supports rather than clamps.

Because the oil inside is filtered and the dust outside is not. Once the cover is cut, dust and washdown water reach the wire and the burst margin falls away while the working pressure still looks correct on paper, so the 140.0 MPa figure no longer applies.

The 1-1/4 inch code at 350 bar on a 420 mm arc, at 3.75 kg/m. Hoist rams move a lot of oil slowly, so the bore is sized for flow and the constant pressure rating means the class does not have to be checked separately.

The 3/4 inch code at 35.0 MPa and a 240 mm arc, at 1.36 kg/m. A feed beam flexes and the routing is tight, so the smallest bore is chosen for the arc rather than for the flow.

100 m per size, cut to length, across 18.6 mm to 39.3 mm inside diameter. Production runs about 20 days from confirmation, and assemblies ship crimped and pressure-tested with metric, BSP, JIC or ORFS ends.

Price follows the bore: 1.36 kg/m at 3/4 inch, 2.12 at 1 inch, 3.75 at 1-1/4 inch and 5.49 kg/m at 1-1/2 inch. Samples are cut free so a route can be checked against the 240 to 500 mm arc, and a firm figure follows bore, length, ends and destination.