Dear Members,
The fittings manufactured as per international standard dimension such as ASME or MSS can be galvanized for corrosion protection. Normally the small size galvanized fittings are used with internally or extenrally threaded end.
My question is whether the internal thread for...
Dear member,
ASME B31.3 para.M307.2.(b).(1) specifies as below;
==================== Quote =============================
(1) Special consideration shall be given to
valve design to prevent stem leakage to the environment.
==================== Unquote ===========================
There may be...
Dear members,
In the project piping material specification, the client indicated "NACE RP0391" in item descriptions.
However my understanding is that once the material is selected by NACE RP0391, "NACE RP0391" does not have to be indicated in item descriptions to be given to manufacturer.
For...
Dear member,
In project piping material specification, client specified "SOUR" in item descriptions of 316/316L stainless steel and UNS N08825 piping components including valves to meet the requirements of NACE MR0175/ISO 15156.
I think that 316/316L and UNS N08825 basically meet the...
Dear members,
ASME B31.3 Table A-1B specifies Ej (quality factors for longitudinal weld joints) for various pipes and fittings.
For welded fittings (i.e. ASTM A234-WPB), it allows Ej=1 only if they are 100% radiography examined.
However if they are not 100% radiography examined, what Ej value...
Dear members,
Now is my first experience for well head piping.
The P&ID requires spec break between ASME B31.3 and API 6500.
My questions are;
1. What is API 6500 piping?
2. What are the codes&standards that govern API 6500 piping? (wall thickness, rating, material spec, etc.)
Thanks in...
Dear members,
A project document requires coal tar enamel coating as per AWWA C203 for underground water piping.
However this is the first time for me to use coal tar enamel coating for underground water piping.
My question is,
What is the benefit of coal tar enamel coating instead of PE or...
Dear members,
Could you recommend good websites or text books or reference books regarding piping design and piping materials including valves for LNG plants or LNG terminals?
very thanks in advance......
Dear members,
I am a very novice for cladded piping.
My questions are;
1. Are there any special requirements when welding between inconel 625 cladded carbon steel pipes to be used in sour service?
2. Should welding between inconel 625 cladded carbon steel pipes be done at manufacturers'...
Dear members,
Based on F331.1 in ASME B31.3, the minimum tempering temperature of some low alloys in ASTM is lower than the heat treatment temperature listed in Table 331.1.1 in ASME B31.3. It means that the heat treatment at site may give any adverse effect to some low alloy items.
(i.e...
Dear all,
What is the dimensional difference between raised face and large male flanges for CL600 & higher as per ASME B16.5?
The height of raised portion (6mm), outside diameter of raised portion and thickness of flange are all same.
If vendor proposes raised face flange instead of large...
Dear members,
According to ASME B31.3 Table A-1 (Basic Allowable Stresses in Tension for Metals), the allowable stress of ASTM A312-TP321 seamless pipe is different depending on its thickness ( greater than 3/8 in. or 3/8 in & below).
My questions are followings;
1. Normally, we use this...
Dear good members,
If the required corrosion allowance for a piping class is very high, which might be 4.5mm or 6mm, should this be conisdered for valve shell wall thickness?
My opinions are as follows;
1. Unless client's specification requires this high corrosion allowance to be added to...
Dear member,
When we calculate the branch reinforcement as per ASME B31.3 para.304.3.3, L4 is defined as height of reinforcement zone outside of run pipe. And Fig 304.3 indicates that L4 is the height of limits of reinforcement zone.
My question is,
when we calculate the reinforcement area...
Dear members,
In current project, there is a chlorination diffuser for sea water intake system.
We used GRE (epoxy resin) or GRV (vinylester resin) pipes for intake system depending on size.
However the problem is DN 80 chlorination diffuser.
The manufacturer insists that GRV must be used for...
Dear Members,
What is the main difference between pressure balance type and non-pressure balance type plug valves with respect to their function?
thanks in advance...
Dear members,
What is the multi-turn ball valve?
Is it orbit ball valve?
If so, what is the purpose to use that kind of ball valve?
Thanks in advance....
Dear members,
In ASTM documentations, we frequently see the sentence "~~when approved by purchaser.". It means that some actions by manufacturer can be done only when approved by purchaser.
My question is, when we carry out the project, does the purchaser mean our client or engineering...
Dear members,
Based on API 589 closure test requirements, some passing (leakage) is permitted during manufacturer shop closure test.
However what about the passing at construction site during line hydrotest?
Is there any international code or standard for that case?
You know that the test...
