Consolidated 1900/P Series Safety Valves Instruction Manual
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© 2020 Baker Hughes Company. All rights reserved.
S E A L
E D
Removal and/or
breakage of seal will
negate our warranty.
IV. Warranty Information
Defective and
nonconforming items
must be inspected by
Baker Hughes
Warranty Statement:
1
Baker Hughes warrants that its products and work will meet
all applicable specifications and other specific product and work requirements
(including those of performance), if any, and will be free from defects in material
and workmanship
CAUTION: Defective and nonconforming items must be held for Baker Hughes
inspection and returned to the original F.O.B point upon request.
Incorrect Selection or Misapplication of Products:
Baker Hughes cannot be
responsible for customer’s incorrect selection or misapplication of our products.
Unauthorized Repair work:
Baker Hughes has not authorized any non-Baker
Hughes-affiliated repair companies, contractors or individuals to perform warranty
repair service on new products or field repaired products of its manufacture.
Therefore customers contracting such repair services from unauthorized sources
must do so at their own risk.
Unauthorized Removal of Seals:
All new valves and valves repaired in the field
by Baker Hughes Field Service team are sealed to assure the customer of our
guarantee against defective workmanship. Unauthorized removal and/or breakage
of this seal will negate our warranty.
Note 1 Refer to Baker Hughes Standard Terms of Sale for complete details on
warranty and limitation of remedy and liability.
V. Terminology for Safety Valves
The basic definitions of safety valves are given in ANSI B95.1, Terminology for
Safety Valve Devices; ASME PTC 25.3, Performance Test Code for Safety and
Relief Valves; and API RP 520, Design and Installation of Pressure Relieving
Systems in Refineries.
• Accumulation
See Overpressure
• Back Pressure
The pressure at the discharge side of the valve.
• Superimposed Back Pressure
The pressure in the discharge header before the valve opens
- Constant Superimposed: This type of back pressure remains essentially
at a fixed value (constant) and exists (superimposed) continuously prior to
and during the opening of the valve.
- Variable Superimposed: This type of back pressure varies or changes over
a range from a minimum to a maximum, or vice versa. The actual back
pressure at any specific time depends on conditions in the piping system to
which the outlet of the valve is connected.
• Built-up Back Pressure
The pressure which develops at the valve outlet as a result of flow after the
valve is opened.
(paraphrased from PTC 25.3)
