Hi,
What is the recommended fabrication tolerances for the top plate flatness of the rectangular tank?
There is no limitations or guidance in any of the standards. As a good practice +/- 5.0mm tolerance measured between the distance is < 500 MM should be ok ?
Any expert opinion and references...
To my understanding, for Dual Grade, Carbon content to meet SS 316 L (or any Chemical composition). And Grade strength to meet SS 316.
Grade strength to be calculated as per formula given in ASTM A -999 Clause 22.2.1 Eq. 3 and 22.2.2.
To be specified clearly in buying description.
ED
Carbon content is <0.03 and it is in the range and as i mentioned before tested strength also meeting the straight carbon (SS316). Only the printed letter in MTC is in question.
Material test Certificates (MTC's) covers chemistry and strength of the Straight Grade. (Both Yield and Tensile), But the Grade marking and Letter Printed in the cert shows SS 316 L.
Still i would be a problem to accept the material by Client ?
Hi,
In Client general Piping Class standard it is mentioned as SS 316/SS 316L. It is not specified as Dual Grade.
However, End user/Client deliverable (ISO, MTO and other documents) specified as SS 316L only.
Reviewer is insisting on the Dual Grade requirement.
Need some clarification on the...
Hi EdStainless
Why are you using 825 in this system?
It is the project specification requirement. This is 3/4" gate valve provided as a Drain valve for 8" Ball Valve.
Specification calls for Inconel (Same as Trim of Ball Valve).
Is 316 what the valve manufacturer recommends?
No. In Project...
Hi,
Need expert metallurgy advice on galvanic corrosion for using stainless bolts on ASTM B564 N088825 (Incoloy 825) valve body-bonnet bolting.
Project specification allows to use austenitic stainless bolting AISI Type 316 (per A193). However, need clarity with respect to galvanic corrosion...
Fiscal metering system
thread481-243523
Hi..This is in continuation to the referred thread on Metering system.
For metering system, I have few questions :
1.the importance of Pressure Balancing line at the Inlet at of each metering train and recommended sequence of operating this balancing...
Hi Little Inch,
Normally the valve at the Inlet of PSV is kept opened.
But in this case, as suggested by vendor flat sealing configuration seems to be the best option.
Thank you all.
Hi Expert Whipper Snapper,
Thanks for your expert opinion. Valve vendor suggested for a flat sealing configuration in place of conical seat for low pressure application. Also, we need to upfront inform valve vendor during selection about the pressure range for them to choose a right...
Hi Littleinch,
PSV set at 10% of the operating range complying to API 675 guideline. There are no issues so far, if the process is not too much of variant than the given value by client.
But how does it link with the Check Valve reverse flow issue. Please clarify.
Thanks littleinch
Reverse flow noticed through the Pressure gauge deflection, when switching over the pumps for testing pressure.
My interpretation is that, there is a check valve in pump itself, and small reverse flow is ok. Please correct my understanding..
Thanks mk223 for your response.
The Check valve installed is spring loaded lift type Check.
Just want to know, whether responses given by vendor is valid in this case. Check valve to function in case of any amount of pressure in case of reverse.
thread378-124275
Hi,
There is a Check Valve installed in the discharge side of the reciprocating pump in the Chemical Injection Package. Working and Stand-by Pumps are connected to common header. During FAT of the packages, when testing the scenario of switching from Working (Pump A) to...
Thanks for the suggestion.
But, as per table A.8 ISO 15156-3 it is mentioned as "Material have been used without restriction on P H2S, temperature , pH in production environment. Only Chloride Conc. Max 50 mg/l to be checked. If the temperature is exceeding on the 60 Deg C, can we interpret...
ASTM A351 CK3MCuN is a 6% Mo Super Austenitic Grade of Stainless Steel. For the Gas flowline service with 5.22% mole H2S, is this material is suitable for the service? How can we interpret this with ISO 15156-3 Standard. Please suggest
