Valve ya usalama ni nini?

Valve ya usalama (au valve ya kupunguza shinikizo) ni kifaa kinachoacha maji kiotomatiki wakati shinikizo linazidi kiwango kilichowekwa awali. Inalinda vifaa dhidi ya shinikizo kupita kiasi kulingana na ASME Section VIII, ISO 4126, au mahitaji ya PED.

Eneo la tundu huhesabiwaje kwa ajili ya huduma ya gesi?

For gas/vapor service per API 520: A = W / (C × Kd × P₁ × Kb × √(M/TZ)), where W is required capacity, C is gas constant factor, Kd is discharge coefficient, P₁ is relieving pressure, Kb is back pressure correction, M is molecular weight, T is temperature, and Z is compressibility factor.

Vipimo vya kawaida vya tundu vya API ni vipi?

API 526 defines standard orifice sizes designated by letters: D (0.110 in²), E (0.196 in²), F (0.307 in²), G (0.503 in²), H (0.785 in²), J (1.287 in²), K (1.838 in²), L (2.853 in²), M (3.60 in²), N (4.34 in²), P (6.38 in²), Q (11.05 in²), R (16.0 in²), T (26.0 in²).

Tofauti kati ya shinikizo la kuweka na shinikizo la kutoa ni nini?

Set pressure is the pressure at which the valve begins to open. Relieving pressure is the set pressure plus allowable overpressure (typically 10% for single valves per ASME VIII). The sizing calculation uses relieving pressure (absolute) as P₁.

Je, ninahitaji kuzingatia shinikizo la nyuma?

Ndiyo. Shinikizo la nyuma la mara kwa mara hupunguza tofauti ya ufanisi katika valve. Kwa valve za kawaida, kipengele cha marekebisho ya shinikizo la nyuma Kb hupanga uwezo. Valve za puto zilizosawazishwa au zinazofanyakazi kwa msaidizi wa rubani huathiriwa kidogo na shinikizo la nyuma.

Zana ya Uhandisi Isiyolipisha

Kikokotoo cha Upangaji Ukubwa wa Valve ya Usalama

Panga ukubwa wa valve za usalama za shinikizo kulingana na ISO 4126 / API 520. Hesabu eneo la tundu linalohitajika na chagua herufi ya kawaida ya tundu kwa ajili ya huduma ya gesi, mvuke, au maji.

ISO 4126API 520/526Gesi / Mvuke / Maji

Fluid Type

Uwezo Unaohitajika (kg/h)

Set Pressure (bar g)

Back Pressure (bar g, 0 ikiwa atm)

Joto la Kutoa (°C)

Uzito wa Molekuli (kwa gesi, mfano 29 kwa hewa)

Uwiano wa Joto Maalum k (Cp/Cv)

Msongamano Z

Quick presets

Results

Eneo la Orifice Linalohitajika

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Herufi ya Orifice ya Kawaida

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Eneo la Orifice ya Kawaida

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Shinikizo la Kutoa (abs)

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Kd (Mgawo wa Kutoa)

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Sehemu ya Msalaba ya Valve

Upimaji wa Gesi / Mvuke (API 520)

Majina ya Kawaida ya Orifice ya API (API 526)

Letter	Area (mm²)	Area (in²)	Ingizo la Kawaida × Tokeo
D	71.0	0.110	1″ × 2″
E	126.5	0.196	1″ × 2″
F	198.1	0.307	1½” × 2½”
G	324.5	0.503	1½” × 3″
H	506.5	0.785	2″ × 3″
J	830.3	1.287	3″ × 4″
K	1186	1.838	3″ × 6″
L	1841	2.853	4″ × 6″
M	2323	3.600	4″ × 6″
N	2800	4.340	4″ × 6″
P	4116	6.380	6″ × 8″
Q	7129	11.05	6″ × 10″
R	10323	16.00	8″ × 10″
T	16774	26.00	8″ × 12″

⚠️ Note: Kikokotoo hiki kinatoa upimaji wa awali. Uchaguzi wa mwisho wa valve lazima uthibitishwe na mtengenezaji wa valve na uzingatie kanuni zinazohusika (ASME VIII, PED, n.k.).

Kikokotoo cha Ukadiriaji wa Valve ya Usalama | ISO 4126 | Valve ya Kupunguza Shinikizo

Published by Nikolai Shelkovenko on Febuari 15, 2026 Febuari 15, 2026

Results

Upimaji wa Gesi / Mvuke (API 520)

Majina ya Kawaida ya Orifice ya API (API 526)

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