XN-85™

Sizes & Pressures

XN-85™ Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

in	mm	psig		barg		psig		barg		psig		barg		psig		barg		psig		barg
Disk Size		Nickel Alloy 200				Monel Alloy 400				Inconel Alloy 600				316SS				Aluminum
in	mm	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max
1	25	188	1500	13	103	225	1500	16	103	225	1800	16	124	335	1800	23	124	113	199	8	13
1.5	40	135	1500	9	103	165	1500	11	103	165	1800	11	124	250	1800	17	124	81	135	6	9
2	50	113	1350	8	93	135	1350	9	93	135	1800	9	124	200	1800	14	124	68	113	5	8
3	80	90	1250	6	86	108	1250	8	86	108	1600	8	110	160	1600	11	110	54	90	4	6
4	100	75	1200	5	82	90	1200	6	83	90	1400	6	97	135	1400	9	97	45	75	3	5
6	150	60	1100	4	76	72	1100	5	76	72	1150	5	79	125	1200	8.6	83	36	60	3	4
8	200	53	1000	4	69	63	1000	4	69	63	1050	4	72	120	1100	8	76	–	–	–	–
10	250	45	900	3	62	54	900	4	62	54	950	4	66	115	1000	8	69	–	–	–	–
12	300	41	750	3	52	50	750	4	52	50	850	4	59	110	900	8	62	–	–	–	–
14	350	35	500	2	34	42	500	3	34	42	700	3	48	100	800	7	55	–	–	–	–
16	400	33	200	2	19	39	270	3	19	39	350	3	24	90	400	6	28	–	–	–	–
18	450	33	200	2	14	38	200	3	14	38	260	3	18	85	300	6	21	–	–	–	–
20	500	32	170	2	12	36	170	2.5	12	36	220	2.5	15	80	250	5.5	17	–	–	–	–
24	600	30	140	2	9	33	140	2	9	33	180	2	12	70	200	5	14	–	–	–	–

Optional liner: liners are available in all sizes on the process or downstream side (or for both; consult factory). Fluoropolymer film application range -40°F to 500°F (-40°C to 260°C)

Burst Tolerance

Marked Burst Pressure	Burst Tolerance
≤ 40 psig (2.76 barg)	± 2 psig (0.138 barg)
> 40 psig (2.76 barg)	± 5%

Safety Heads & Sensors

Safety Heads

NFI-7RS Safety Head

NF-7RS Safety Head

NX-7R & NXV-7R Safety Head

NF-7R Safety Head

Sensors

Burst Alert Sensors (BAS+)
Round or Square

Leak Detector Alert Sensors (LDAS+) Round or Square

Accessories

BS&B supplies many of the accessories required to safely and conveniently install our overpressure relief devices and complementary products. Through our professional team and global network of sales engineers and procurement personnel, we are able to provide the highest quality accessory products to meet your installation requirements.

Saf-T-Change Quick Disk Replacement (QDR)

After activation, the replacement disk is quickly slid into place. Saving hours of lost production due to blown rupture disks.

Tell-Tale Assemblies & Excess Flow Valves/Gauges

A gauge tap in the outlet flange of the safety head may be considered when the safety head is installed in a vertical position.

Spare Safety Heads & Cap Screws

Jackscrews

When activated, the jackscrews effectively separate the flanges, providing adequate clearance to remove or insert a safety head and external gaskets.

Lifting Lug Eye Bolts

Eye bolts are recommended when weight and/or accessibility is a factor in lifting safety heads.

Baffle Plate

When a safety head is free-vented to atmosphere, a baffle plate may be considered to disperse overpressure and absorb recoil.

Documentation

Product Literature

Nu-Saf™ Series Scored Forward Acting Rupture Disks

Composite and scored tension-loaded disks for low to medium rupture pressures in a low cost safety head

Saf-T-Change™ QDR Rupture Disk Replacement System

Quick replacement of actives disk fast and with minimum process line exposure to personnel and the environment.

Burst Alert Sensors

A range of sensors suitable for different rupture disk types used to provide immediate warning of a ruptured disk., #77-1003

Detec Saf Alarm System – Burst Disk Monitor

Detec-Saf™ alarm system provides immediate warning and specific location of disk rupture and centralized monitoring of all disk locations.

Installations

Nu-Saf™ Installation Instructions

Burst Alert Sensor Installation Instruction

Burst Alert Leak Dectector Installation Instruction

Sizes & Pressures

XN-85™ Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

in	mm	psig		barg		psig		barg		psig		barg		psig		barg		psig		barg
Disk Size		Nickel Alloy 200				Monel Alloy 400				Inconel Alloy 600				316SS				Aluminum
in	mm	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max	min	max
1	25	188	1500	13	103	225	1500	16	103	225	1800	16	124	335	1800	23	124	113	199	8	13
1.5	40	135	1500	9	103	165	1500	11	103	165	1800	11	124	250	1800	17	124	81	135	6	9
2	50	113	1350	8	93	135	1350	9	93	135	1800	9	124	200	1800	14	124	68	113	5	8
3	80	90	1250	6	86	108	1250	8	86	108	1600	8	110	160	1600	11	110	54	90	4	6
4	100	75	1200	5	82	90	1200	6	83	90	1400	6	97	135	1400	9	97	45	75	3	5
6	150	60	1100	4	76	72	1100	5	76	72	1150	5	79	125	1200	8.6	83	36	60	3	4
8	200	53	1000	4	69	63	1000	4	69	63	1050	4	72	120	1100	8	76	–	–	–	–
10	250	45	900	3	62	54	900	4	62	54	950	4	66	115	1000	8	69	–	–	–	–
12	300	41	750	3	52	50	750	4	52	50	850	4	59	110	900	8	62	–	–	–	–
14	350	35	500	2	34	42	500	3	34	42	700	3	48	100	800	7	55	–	–	–	–
16	400	33	200	2	19	39	270	3	19	39	350	3	24	90	400	6	28	–	–	–	–
18	450	33	200	2	14	38	200	3	14	38	260	3	18	85	300	6	21	–	–	–	–
20	500	32	170	2	12	36	170	2.5	12	36	220	2.5	15	80	250	5.5	17	–	–	–	–
24	600	30	140	2	9	33	140	2	9	33	180	2	12	70	200	5	14	–	–	–	–

Optional liner: liners are available in all sizes on the process or downstream side (or for both; consult factory). Fluoropolymer film application range -40°F to 500°F (-40°C to 260°C)

Burst Tolerance

Marked Burst Pressure	Burst Tolerance
≤ 40 psig (2.76 barg)	± 2 psig (0.138 barg)
> 40 psig (2.76 barg)	± 5%

Safety Heads & Sensors