Emerson daniel 1500 series, Руководство пользователя

Страница: 70 / 104

Bolt material selection
(continued)
Table 6-2:
Bolt material selection Description
ASTM SA 453 Grade 660 High temperature stainless steel
Selection of flange stud bolts and nuts
• Select all fasteners (nuts and studs) used in a hydrostatic test according to the flange
size and quantity listed in ASME ANSI B16.5.
• Use the shortest stud bolt that permits full engagement of the thread through the
nut by hand-tightening.
• Use only clean, rust-free nuts and stud bolts.
Important
Ensure that once the nut is tightened, two threads outside the nut are exposed. The only exception is
when a flange requires hydraulic bolt tensioning. The manufacturer of the hydraulic bolt tensioning
equipment will specify number of exposed threads outside the nut.
• Do not use damaged or worn stud bolts or nuts.
• Do not use nuts or stud bolts that do not fit correctly together.
• Do not use nuts or stud bolts without grade or type identification.
• Do not mix nuts or stud bolts of different coatings. Different nut and stud bolt
coatings require different torques to achieve the same bolt tension.
• Do not assemble nuts with the identification hard stamp against the back face of the
flange
Flange stud bolt and nut storage
Remove each nut and bolt as a pair. Thread the matching nut back onto the bolt. Stack
them in a fashion that will not cause thread damage.
Reuse of flange stud bolts and nuts
Daniel Quality Control permits the reuse of threaded fasteners under the following
conditions:
• Fasteners are clean, free of corrosion, paint, thread damage, cracks, teeth marks
(caused by wrenches) or other signs of damage.
• Fasteners are not tightened to or beyond their yield strength.
• Fasteners have not lost their coating.
Compare the threads of a used stud bolt with the thread of a new stud bolt. Finger-tighten
the nut over the entire length of the bolt.
6.3 Assemble the electronic components
Follow the procedure below to install the LME and/or the RME electronics.
Installation procedure
60 Daniel Series 1500 Liquid Turbine Meter, NPS 3-24