CORRUGATED METAL HOSE

SS Metal Hose

Corrugated Metal Hose Fundamentals

Penflex corrugated hose is a high quality general purpose industrial hose. It is produced in carbon steel, bronze, stainless steel (types 304L, 316L and 321), monel, titanium and many others. The corrugated hose is manufactured from a cylindrical, thin walled tube formed from rolled strip and joined at the seam by butt welding. Impressed into this tube is a corrugated annular profile. Annular corrugated hose has several advantages over helical hose. It is not subject to damaging torsional stress due to longitudinal expansion resulting from pressure rises. When the corrugations are closely spaced, the hose is referred to as "standard pitch" hose. When the corrugations are more widely spaced, the hose is referred to as "open pitch" hose. All information in this section is relevant to standard pitch, annular corrugated hose. Data on open pitch hose is available upon request.

The thickness of the metal strip, the height of the corrugations and the number of corrugations per foot all affect the performance characteristics of metal hose. Flexibility in corrugated hose

is the result of the bending of the metal corrugations. Service life varies depending upon the severity of the flexing, the temperature, corrosive conditions, pressure and vibration to which the hose is subjected.

Unless restrained, corrugated hose will elongate when subjected to increasing internal pressure. This restraint is provided by a braided covering, consisting of a tubular sheath of woven metal wires fitted tightly over the corrugated hose and secured at each end. Flexibility of the corrugated hose is not appreciably affected by this wire braid covering. In addition, the braid provides squirm support and dampens vibration. In higher pressure applications, the use of additional braid covers will provide additional working pressure. Unbraided hose is satisfactory for vacuum and low pressure applications.

Corrugated hose is recommended for applications involving permanent bends, and in situations where flexing is predictable, that is, machine controlled. Also, whenever absolute leak prevention is essential, corrugated hose should be selected.

Guide to Specification Table Headings

The specification tables below tabulate the dimensions and properties of Penflex corrugated hose. The explanations on this page give complete descriptions for each of the column headings of those tables.

Properties

Hose Size- This column lists the nominal I.D. sizes of the corrugated hose manufactured by Penflex.
Braid- This column shows the number of wire braid covering(s) required for the indicated pressure rating.
Hose O.D.- This column indicates the nominal outside diameter of each size stated in inches.
Pressure Ratings-The maximum working, maximum test and nominal burst pressures for each hose size shown are based on assemblies with welded on fittings for stainless and steel hose, and brazed on fittings for bronze hose. These ratings are in PSIG at 70:F.

The maximum working rating is the maximum operating pressure to which a hose assembly should be subjected. These ratings represent the application of a 4 to 1 safety factor against nominal burst pressure. For installations involving pulsating, the peak pressure should be limited to 50% of the maximum working pressure.

The maximum test rating is the maximum pressure to which a straight hose assembly may be subjected without causing permanent deformation of the hose.

The nominal burst rating is the pressure at which a hose assembly can be expected to rupture. This rating is predicated upon the hose being installed in a straight position and at normal room temperature.

Weight- This column shows the approximate weight per hundred feet of each size and is given in pounds per hundred feet.
Centerline radius for constant flexing- This column states, in inches the minimum bend radius to which a hose size may be bent when installed in conditions of motion that occur on a regular or intermittent basis.
Centerline radius for static bend- This column states, in inches, the minimum bend radius to which a hose size may be bent when installed in conditions of no movement other than infrequent vibrations.

Stainless Steel Hose-Type 304L, 316L & 321

Standard Weight

Nominal I. D.	Number Braids	Nominal O. D.	Maximum WP @ 70:F	Maximum Test	Nominal Burst	Weight /C Ft	Bend Radius Constant Flex	Bend Radius Static Bend
1/4	0	0.50	180	270	-	9	5.00	1.00
	1	0.57	2550	3825	10200	18
	2	0.64	4080	6120	16320	26
3/8	0	0.67	100	150	-	13	5.50	1.25
	1	0.74	1825	2737	7300	24
	2	0.81	2920	4380	11680	36
1/2	0	0.82	80	120	-	23	6.00	1.50
	1	0.89	1075	1612	4300	34
	2	0.96	1720	2580	6880	46
3/4	0	1.21	70	105	-	39	8.00	2.25
	1	1.28	775	1162	3100	59
	2	1.35	1240	1860	4960	79
1	0	1.51	40	60	-	53	9.00	2.75
	1	1.58	550	825	2200	75
	2	1.65	880	1230	3520	98
1-1/4	0	1.85	25	37	-	76	10.50	3.50
	1	1.93	525	787	2100	106
	2	2.03	840	1260	3360	137
1-1/2	0	2.19	20	30	-	84	12.00	4.00
	1	2.27	450	675	1800	123
	2	2.35	720	1080	2880	163
2	0	2.70	15	22	-	104	15.00	5.00
	1	2.80	475	712	1900	173
	2	2.90	760	1140	3040	241
2-1/2	0	3.23	12	18	-	116	20.00	8.00
	1	3.33	375	562	1500	188
	2	3.43	600	900	2400	259
3	0	3.78	10	15	-	121	22.00	9.00
	1	3.88	300	450	1200	204
	2	3.91	480	720	1920	286
4	0	4.85	8	12	-	169	27.00	13.00
	1	4.98	275	412	1100	292
	2	5.10	440	660	1760	415
5	0	5.90	6	9	-	208	31.00	18.00
	1	6.03	200	300	800	347
	2	6.15	320	480	1280	485
6	0	6.87	5	8	-	347	36.00	19.00
	1	7.10	190	285	760	516
	2	7.12	300	450	1200	686

Stainless Steel Braid-Type 304L

Standard Weight

Size	Construction	Braid Angle	% C	Wt. /C Ft
1/4	24 x 5 x .014	40	89	8
3/8	24 x 7 x .014	40	92	12
1/2	24 x 7 x .014	40	80	12
3/4	36 x 8 x .014	40	89	20
1	36 x 9 x .014	40	83	23
1-1/4	48 x 7 x .016	40	83	31
1-1/2	48 x 9 x .016	40	86	40
2	48 x 10 x .020	40	91	69
2-1/2	72 x 7 x .020	40	87	72
3	72 x 8 x .020	40	86	82
4	72 x 8 x .025	37	83	123
5	72 x 9 x .025	37	79	139
6	72 x 11 x .025	37	82	169

NOTE: 316L Heavy Weight, along with standard weight Bronze, Monel and Carbon Steel hoses are available on a special order basis. Please call for further information.

Available End Fittings

Male Pipe Nipple	Female Pipe Coupling	150# or 300# Fixed Flange
Male Pipe Union	Female Pipe Union	150# or 300# Floating Flange
Hex Male Pipe	Female 37: JIC	Plain Pipe (No Thread) Weld End

Temperature Adjustment Factor Table

In general, the strength and therefore the pressure rating of metal hose decreases as the temperature increases. Thus, as the operating temperature of a metal hose assembly increases, the maximum allowable working pressure of the assembly decreases. The pressure ratings shown in the specifications charts for corrugated and

interlocked hose are valid at 70:F. Elevated service temperatures will decrease these pressure ratings by the factors shown in the following chart. What also must be considered is the maximum working temperature of the end fittings, of the hose and their method of attachment.

Temperature Degrees F	Stainless Steel	Carbon Steel	Monel	Bronze
70	1.00	1.00	1.00	1.00
150	.97	.99	.93	.92
200	.94	.97	.90	.89
250	.92	.96	.87	.86
300	.88	.93	.83	.83
350	.86	.91	.82	.81
400	.83	.87	.79	.78
450	.81	.86	.77	.75
500	.78	.81	.73	-
600	.74	.74	.72	-
700	.70	.66	.71	-
800	.66	.52	.70	-
900	.62	-	-	-
1000	.60	-	-	-
1100	.58	-	-	-
1200	.55	-	-	-
1300	.50	-	-	-
1400	.44	-	-	-
1500	.40	-	-	-

Example:

Calculate the maximum working pressure for >" ID single braided stainless steel corrugated hose at 800:F.

From the corrugated metal hose specification table, the maximum working pressure at 70:F is 775 PSIG.

Multiply 775 PSIG by 0.66. The maximum working pressure at 800:F is 511 PSIG