Emerson 8712E manual Size Class, Code, Pound-feet

Quick Installation Guide

Rosemount 8712 / 8700 Series

00825-0100-4664, Rev BB January 2013

If leakage has not stopped at the suggested torque values, the bolts can be tightened in additional 10% increments until the joint stops leaking, or until the measured torque value reaches the maximum torque value of the bolts. Practical consideration for the integrity of the liner often leads the user to distinct torque values to stop leakage due to the unique combinations of flanges, bolts, gaskets, and sensor liner material.

Check for leaks at the flanges after tightening the bolts. Failure to use the correct tightening methods can result in severe damage. Sensors require a second tightening 24 hours after the initial installation. Over time, sensor liner materials may deform under pressure.

Figure 7. Flange Bolt Torquing Sequence

1

8 5

4 8-bolt 3

67

2

Table 1. Suggested Flange Bolt Torque Values for Rosemount 8705 and 8707 High-Signal Sensors

		PTFE/ETFE/PFA		Polyurethane/Neoprene/Linatex/Adiprene
		liners			liner
Size		Class 150	Class 300	Class 150		Class 300
Code	Line Size	(pound-feet)	(pound-feet)	(pound-feet)		(pound-feet)
005	0.5 inch (15 mm)	8	8	-		-
010	1 inch (25 mm)	8	12	-		-
015	1.5 inch (40 mm)	13	25	7		18
020	2 inch (50 mm)	19	17	14		11
030	3 inch (80 mm)	34	35	23		23
040	4 inch (100 mm)	26	50	17		32
060	6 inch (150mm)	45	50	30		37
080	8 inch (200 mm)	60	82	42		55
100	10 inch (250 mm)	55	80	40		70
120	12 inch (300 mm)	65	125	55		105
140	14 inch (350 mm)	85	110	70		95
160	16 inch (400 mm)	85	160	65		140
180	18 inch (450 mm)	120	170	95		150
200	20 inch (500 mm)	110	175	90		150
240	24 inch (600 mm)	165	280	140		250
300	30 inch (750 mm)	195	415	165		375
360	36 inch (900 mm)	280	575	245		525

10